Home Physical Sciences Efficient and stable to coking catalysts of ethanol steam reforming comprised of Ni + Ru loaded on MgAl2O4 + LnFe0.7Ni0.3O3 (Ln = La, Pr) nanocomposites prepared via cost-effective procedure with Pluronic P123 copolymer
Article Open Access

Efficient and stable to coking catalysts of ethanol steam reforming comprised of Ni + Ru loaded on MgAl2O4 + LnFe0.7Ni0.3O3 (Ln = La, Pr) nanocomposites prepared via cost-effective procedure with Pluronic P123 copolymer

  • Bakytgul Massalimova EMAIL logo , Vladislav Sadykov , Nurzada Totenova , Julia Fedorova , Tatyana Glazneva , Tamara Krieger , Vladimir Rogov and Arkady Ishchenko
Published/Copyright: December 11, 2024
Download Article (PDF)
Open Chemistry
From the journal Open Chemistry Volume 22 Issue 1

Abstract

Mesoporous MgAl2O4 + LnFe0.7Ni0.3O3 (Ln = La, Pr) nanocomposites were prepared by a cost-effective one-pot procedure with the Pluronic P123 copolymer and Ni + Ru active components were supported on them by wet impregnation. The real structure of samples was studied by X-ray diffraction and transmission electron microscopy with energy-dispersive X-ray spectroscopy, surface properties were determined by Fourier transform infrared spectroscopy of adsorbed CO, reactivity was evaluated by temperature programmed reduction by H2, and catalytic activity was tested in ethanol steam reforming (ESR). Disordering of the real structure of nanocomposite supports due to incorporation of transition metal cations into MgAl2O4 results in the development of a metal–support interface and domination of single surface metal centers. This provides a high catalytic activity in the ESR reaction in the intermediate temperature range ∼550°C, close to that of the best known catalysts, and stability to coking. A higher activity for the Pr-containing catalyst is provided by the high reactivity of surface oxygen species bound with Pr cations.

Keywords: ethanol steam reforming; nanocomposite spinel + perovskite supports + Ni + Ru; one-pot synthesis with the Pluronic P123 copolymer; surface sites; FTIRS of adsorbed CO

1 Introduction

The transformation of bio-renewable fuels into syngas and hydrogen is now considered one of the most important problems of green energy production [1]. Ethanol is among the easily produced, cheap, and broadly available fuels; hence, its steam reforming is among the most popular methods of catalysis in this area [2]. In this reaction, traditional cost-effective steam reforming catalysts comprising Ni and/or Co supported on alumina, silica, or zeolites suffer from coking, leading to rapid deactivation of the catalyst [2]. Although Pt group metals possess higher activity and coking stability [2], their high price makes it impossible for practical application. This problem is solved by the design of nanocomposite catalysts composed of mixed oxide supports (with perovskite, fluorite, spinel structures, etc.) possessing high oxygen mobility and reactivity and ability to strongly interact with loaded nanoparticles of Ni or Ni-based alloys [3]. Coking stability is provided by the so-called bifunctional mechanism of reforming, where fuel molecules are activated on metal sites and oxidants on reduced support sites produce reactive oxygen surface species, which rapidly migrate to the metal–support interface and interact with activated fuel fragments producing syngas and preventing their transformation into coke [4]. For realization of this mechanism, a developed metal–support interface is required. Among attractive synthesis procedures to provide such interface, ex-solution of metal nanoparticles (Ni, Co, etc.) from the complex oxides with perovskite, spinel, fluorite, etc. structures under reducing conditions is to be mentioned [5,6,7]. In this case, both the epitaxy of metal clusters with the surface of the support and their decoration by oxidic fragments provide a developed interface, which also helps to prevent sintering of Ni under reaction conditions. While for fluorite-like complex oxides such as PrSmCeZrO2 doped with Ni, the specific surface area (SSA) remains sufficiently high, for perovskite-like oxides containing Mn, Fe, Cr, etc. cations in B positions, along with Ni and Ru, the SSA after calcination in the range of 700–900°C is ∼4 to 7 m2/g [8], which is not good for practical applications. The preparation of nanocomposites composed of perovskite (P) and fluorite (F) allows the stabilization of the surface area of catalysts after Ni segregation, apparently by hampering the migration of cations between perovskite nanodomains via the presence of fluorite nanodomains as barriers [9]. While the one-pot Pechini route of P + F nanocomposite synthesis has not allowed us to obtain nanodomains of the perovskite phase due to incorporation of transition metal cations into fluorite domains, it is possible to prepare nanocomposites containing perovskite nanodomains when fluorite nanopowders are dispersed in the perovskite polymeric precursor solution with subsequent evaporation and calcination [9].

Another approach to stabilize the dispersion of perovskite-based active components with Ni is to load it by simple wet impregnation on a mesoporous MgAl2O4 support prepared by a one-pot evaporation-induced self-assembly method. In this method, although incorporation of transition metal cations into the spinel lattice takes place, diffraction peaks of the perovskite phase were not observed even for supported 20 wt% PrNi0.9Ru0.1O3 due to their small size and disordering of perovskite domains [10]. Along with reactive surface oxygen species provided by supported perovskite layers, the presence of Mg in this spinel support also helps to suppress coking due to the decreasing density of acid sites responsible for ethylene formation and coke generation [2,4,10,11].

To further simplify the preparation procedure, one-pot synthesis seems interesting, where in the preparation of mesoporous materials with the help of the Pluronic P123 copolymer [10] all cations of perovskite can be mixed with Mg and Al cations in one solution, and then a typical procedure for mesoporous material synthesis will be applied. There is no doubt that part of the transition metal cations will be incorporated into the MgAl2O4 lattice. Hence, to guarantee the presence of perovskite phases in nanocomposites with MgAl2O4, their content has to be rather high, up to ∼50 wt%. The critical point of this nanocomposite synthesis procedure is that due to the presence of high concentrations of Ln and transition metal cations in solution, formation of the MgAl2O4 spinel phase could not be ensured, and to date it is not checked anywhere. Since doping of MgAl2O4 by Fe, Cr, and Ti cations was already demonstrated to be a good option for the increase of supported nanocomposite activity and stability in fuel reforming into syngas [11], testing this promising procedure in the synthesis of nanocomposites composed of perovskites LaFe0.7Ni0.3O3 or PrFe0.7Ni0.3O3 with MgAl2O4 is worth trying, which is the purpose of this article. Its successful application opens up a new route for manufacturing efficient, stable to coking, and cost-effective catalysts for biofuel transformation into syngas and hydrogen for the efficient development of the green energy field. The absence of any liquid waste in this synthesis procedure makes its industrial application very attractive.

2 Materials and methods

2.1 Catalyst preparation

The following reagents were used in the synthesis: P123 Pluronic triblock copolymer ((EO)20(PO)70(EO)20 (M n = 5,800, Sigma Aldrich), aluminum isopropoxide (Al(OPri)3, Acros Organics), HNO3 (REACHIM), Ni(NO3)2·6H2O (Acros Organics), Mg(NO3)2·6H2O (REACHIM), and Pr(NO3)3·nH2O (Vecton). The synthesis procedure is described in detail with an example of the first nanocomposite. The first solution was prepared by adding 60 mL of EtOH to 6.0 g of Pluronic P123 and stirring with a magnetic stirrer for 1 h. The second solution was prepared by adding 30 mL of EtOH and 2 mL of HNO3 to 8.61 g of aluminum isopropoxide and stirring for 1 h. Then, the two solutions were mixed and after stirring for 0.5 h 5.37 g of Mg(NO3)2·6H2O were added. After stirring for 0.5 h, 2.96 g of Fe nitrate and 0.72 g of Pr(NO3)3·nH2O were added and stirred for 3 h, then the resulting solution was dried at 60°C for 72 h. A dried polymeric mixture was placed into a tubular reactor and heated in a stream of air with the heating rate of 1o per minute to 700°C and kept at this temperature for 5 h. 5% Ni + 1% Ru were supported by the impregnation method using mixed solutions of Ni(NO3)2·nH2O (Vecton) and crystalline anhydrous RuOCl3 (Reakhim), followed by drying and calcination at 700°C for 1 h. All reagents were of analytical pure grade and used without any pretreatment.

2.2 Catalyst characterization

Diffraction patterns were obtained using a Bruker Advance D8 diffractometer with CuKα radiation (γ, 1.5418 Å). Scanning was performed in the range of 15–90° (2θ) with a scanning step of 0.05 (2θ) and an accumulation time of 3 s.The diffractograms were processed using the EVA program included in the diffractometer software package for identification of the obtained phases.

High-resolution transmission electron microscopy images were obtained with a JEM-2200FS transmission electron microscope (JEOL Ltd., Japan; acceleration voltage, 200 kV; lattice resolution, 1 Å) equipped with a Cs-corrector and an EDX spectrometer (JEOL Ltd., Japan). The samples for the TEM study were prepared by ultrasonic dispersion in ethanol and consequent deposition of the suspension on a “holey” carbon film supported on a copper grid. The minimum spot diameter for the step-by-step line or mapping elemental energy-dispersive X-ray spectroscopy (EDX) analysis was ∼1 nm with a step of about 1.5 nm.

The SSA of samples was evaluated by the Brunauer–Emmet–Teller (BET) method by recording physical adsorption of nitrogen at the liquid nitrogen temperature using an ASAP-2400 (Micromeritics Instrument. Corp., Norcross, GA, USA) automated volumetric adsorption unit. Before the analysis, samples were outgassed at 150°C for 4 h at a pressure of 1 × 10–3 Torr (∼0.1 Pa). The obtained adsorption isotherms were used to calculate the SSA and pore size distribution.

The surface properties of samples were studied using low-temperature Fourier transform infrared spectroscopy (FTIRS) of adsorbed carbon monoxide (CO), which was earlier efficiently used in our works to estimate the density and local structure of surface metal sites [4,10,11]. Samples were pressed into pellets with a size of 1 × 2 cm2 and a weight of 40 mg, then put into the IR cell and heated in a vacuum to 500°C, followed by H2 addition to 200 Torr and reducing for 1 h at this temperature. Then, the cell was evacuated up to a residual pressure of below 10−4 Torr and cooled to room temperature. Spectra were registered on a Shimadzu IRTracer-100 spectrometer in the range of 400–6,000 cm−1 with a resolution of 4 cm−1 and accumulation of 200 scans. CO was adsorbed at −196°C and CO pressure from 0.1 to 10 Torr. After recording spectra at −196°C, the cell was heated to room temperature and spectra were registered. These spectra recorded in the absorption scale were normalized to the optical thickness of a pellet, and the spectrum before CO adsorption was subtracted from that after CO adsorption. Spectral analysis was carried out by deconvolution of the corresponding IR bands on individual Gaussian components. Concentrations of different adsorption centers were estimated from the integral intensities of observed characteristic absorption bands using integral absorption coefficients [12].

Material reactivity was characterized by temperature-programmed reduction by H2 (TPR-H2) (10% H2 in Ar; feed rate: 2.5 L/h; temperature ramp: from 25 to 900°C at 10 °C/min) in a flow kinetic setup with a quartz U-shaped reactor equipped with a Tsvet-500 chromatograph and a thermal conductivity detector.

2.3 Catalyst testing in ethanol steam reforming (ESR)

ESR was conducted in a continuous-flow fixed-bed quartz reactor under atmospheric pressure in the temperature range of 550–700°C. A total of 30 mg of catalyst (0.25–0.5 mm fraction) was loaded and sandwiched between two quartz wool layers. Prior to the activity test, the catalyst was reduced with 5 vol% H2/Ar (100 mL/min) at 650°C for 1 h. The EtOH and H2O mixture was heated to 120°C and mixed with N2 stream coming from the mass-flow controller, yielding a typical feed gas composition of EtOH/H2O = ¼, where C(EtOH) = 2% vol. The outlet products were analyzed by gas chromatography using a Tsvet-500 chromatograph. To ensure fast steady-state achievement, experiments were started at 700°C, kept for 1 h at this temperature, and then decreasing it to 550°C in steps of 50°C keeping for 1 h at each step.

3 Results

3.1 Structural and textural properties

Figures 1 and 2 present diffraction patterns of studied samples. In both La-containing samples, the MgAl2O4 spinel phase [PDF 00-021-1152] with a crystallite size below 20 nm and lattice parameter 8.08 Å was identified. Two perovskite phases corresponding to LaFe0.75Ni0.25O3 [PDF 01-088-0639] and LaNiO3 [PDF 00-033-0710] were observed. In both patterns, broad diffraction peaks were also present corresponding to the cubic Fm-3m structure of Mg(Ni)O with lattice parameters 4.213 and 4.182 Å for the support and the catalyst, respectively. Moreover, in the support, the La10Al4O21 phase [PDF 00-039-0009] was observed, which is absent after supporting Ni and Ru oxides due to interaction with the impregnating solution. Pr-containing samples (Figure 2) were characterized by broader diffraction peaks compared with La-containing samples (Figure 1), indicating a higher disorder. It is reflected in smaller (9–12 nm) size MgAl2O4 spinel phase domains, while diffraction peaks corresponding to the perovskite phase are very weak or absent. This correlates with the presence of strong PrO2 diffraction peaks with domain sizes of ∼9 to 11 nm, thus indicating instability of the perovskite PrFe0.75Ni0.25O3 phase in combination with the MgAl2O4 spinel phase due to incorporation of transition metal cations into the spinel lattice [11]. After loading NiO + RuO2, the intensity of PrO2 peaks decreases, apparently due to the formation of disordered praseodymium nickelate fragments, while the appearance of RuO2 peaks indicates that Ru is in part deposited as RuO2 nanoparticles. Similar to the case of samples with La, in Pr-containing samples, the Mg(Ni)O solid solution phase (domain sizes below 15 nm) is present as well.

Figure 1 XRD patterns of the nanocomposite support 50% MgAl2O4 + 50% LaFe0.75Ni0.25O3 (1) and the 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst (2). Sp – MgAl2O4 [PDF 00-021-1152], * – LaFe0.75Ni0.25O3 [PDF 01-088-0630], + – LaNiO3 [PDF 00-033-0710], ^ – MgO-NiO [PDF 01-078-0430 MgO], | – RuO2 [PDF 03-065-2824], and ∼ – La10Al4O21 [PDF 00-039-0009]. Moreover, positions of some phases in diffraction peaks are marked by lines.
Figure 1

XRD patterns of the nanocomposite support 50% MgAl2O4 + 50% LaFe0.75Ni0.25O3 (1) and the 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst (2). Sp – MgAl2O4 [PDF 00-021-1152], * – LaFe0.75Ni0.25O3 [PDF 01-088-0630], + – LaNiO3 [PDF 00-033-0710], ^ – MgO-NiO [PDF 01-078-0430 MgO], | – RuO2 [PDF 03-065-2824], and ∼ – La10Al4O21 [PDF 00-039-0009]. Moreover, positions of some phases in diffraction peaks are marked by lines.

Figure 2 XRD patterns of the nanocomposite support 50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 (1) and the 5% Ni + 1% Ru/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) catalyst (2). Sp – MgAl2O4 [PDF 00-021-1152], * – perovskite [PDF 01-074-1472], + – PrO2 [PDF 00-006-0329], ^^ – MgO-NiO [PDF 01-078-0430 MgO], and | – RuO2 [PDF 03-065-2824]. Moreover, positions of some phases in diffraction peaks are marked by lines.
Figure 2

XRD patterns of the nanocomposite support 50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 (1) and the 5% Ni + 1% Ru/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) catalyst (2). Sp – MgAl2O4 [PDF 00-021-1152], * – perovskite [PDF 01-074-1472], + – PrO2 [PDF 00-006-0329], ^^ – MgO-NiO [PDF 01-078-0430 MgO], and | – RuO2 [PDF 03-065-2824]. Moreover, positions of some phases in diffraction peaks are marked by lines.

TEM images of catalyst samples are presented in Figures 3 and 4.

Figure 3 TEM images of the typical regions (a–d) of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) catalyst.
Figure 3

TEM images of the typical regions (a–d) of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) catalyst.

Figure 4 TEM images of the typical regions (a–d) of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst.
Figure 4

TEM images of the typical regions (a–d) of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst.

For both types of catalysts, the particles are composed of stacked nanodomains of different orientations and disordering degrees, apparently corresponding to different phases in agreement with XRD data.

Figure 5 presents the particle size distribution for these catalysts from TEM data. The smaller sizes of particles of the Pr-containing sample agree with XRD data (vide supra).

Figure 5 Particle size distribution for (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (a) and (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (b) catalysts. (Calculated from a pool of different TEM photos at the same magnification using the ImageJ program.).
Figure 5

Particle size distribution for (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (a) and (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (b) catalysts. (Calculated from a pool of different TEM photos at the same magnification using the ImageJ program.).

EDX data (Figure 6, Table 1) for the 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst demonstrate rather moderate spatial variation of the Ni concentration in the surface layer of the nanocomposite, which is good for ensuring reproducibility of catalytic properties. Note that for the LaMn0.45Ni0.45Ru0.1O3 + Pr0.15Sm0.15Ce0.35Zr0.35O2 nanocomposite prepared by a one-pot Pechini route [9], strong spatial variation of the Ni content and hence the degree of Ni agglomeration and interaction with the support resulted in low catalytic activity. A high content of Ru revealed in Figure 4d (Table 1) is apparently due to the presence of RuO2 particles in agreement with XRD data (Figure 1). A high content of Mg in all places also agrees with the presence of the NiO-MgO phase, as revealed by XRD, which provides a strong Ni–support interaction required for suppressing coking. Since according to XRD data (vide supra) for the 50% MgAl2O4 + 50% PrFe0.7Ni0.3O3 nanocomposite, the perovskite phase was absent due to strong incorporation of Ni and Fe cations into the spinel lattice, and the SSA is higher (vide infra), while the Mg(Ni)O solid solution phase is present in the catalyst, even more uniform distribution of Ni on the catalyst surface is expected, which agrees with EDX mapping (Figure 7).

Figure 6 EDX spectra of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst particles in regions a–d in Figure 4.
Figure 6

EDX spectra of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst particles in regions a–d in Figure 4.

Table 1

EDX data on the elemental composition of 5% Ni + 1% Ru/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) catalyst particles in regions a–d in Figure 6

Region in Figure 4 Concentration of elements by EDX, at (%)
Ni Ru La Fe Mg Al
a 16.1 0.7 17.1 11.0 16.9 38.2
b 16.9 0.8 27.4 15.4 22.9 16.6
c 10.5 0.4 13.7 6.9 20.5 47.9
d 15.9 15.5 23.3 15.6 11.9 17.8
Figure 7 Typical HAADF-STEM images and EDX mapping for (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (a) and (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (b) catalysts.
Figure 7

Typical HAADF-STEM images and EDX mapping for (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (a) and (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (b) catalysts.

Figure 8 illustrates nitrogen adsorption isotherms and pore size distribution for catalysts, and Table 2 presents data on their SSA, pore size distribution, and average pore diameter. Adsorption curve hysteresis demonstrates the presence of mesopores, especially for the La-containing catalyst. For the Pr-containing catalyst, apparently, a combination of micropores with macropores is present. TEM images of pores in these catalysts (Figure 9) show that pore sizes reasonably agree with values obtained by analysis of adsorption isotherms. SSA values are reasonably high, though being lower than those for catalysts based on doped MgAl2O4 with supported active components, where values ∼100 m2/g were obtained [11]. Hence, as expected, transition metal and rare earth cations apparently help with the sintering of MgAl2O4 spinel nanodomains. However, SSA values are better than those of catalysts based on perovskite–fluorite nanocomposites with SSAs ∼20 m2/g [9].

Figure 8 Adsorption isotherms and pore size distribution for (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (a, c) and (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (b, d) catalysts.
Figure 8

Adsorption isotherms and pore size distribution for (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (a, c) and (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (b, d) catalysts.

Table 2

Textural characteristics of samples

Sample SSA (m2/g) V pores (cm3/g) D av (nm)
(5% Ni + 1% Ru)/50% MgAL2O4 + 50% LaFe0.7Ni0.3O3 42 0.13 12
(5% Ni + 1% Ru)/50% MgAl2O4 + 50% PrFe0.7Ni0.3O3 83 0.07 14
Figure 9 Typical TEM images of the porous structure (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (a) and the (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (b) catalyst [pores indicated by arrows].
Figure 9

Typical TEM images of the porous structure (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% PrFe0.75Ni0.25O3) (a) and the (5% Ni + 1% Ru)/(50% MgAl2O4 + 50% LaFe0.75Ni0.25O3) (b) catalyst [pores indicated by arrows].

3.2 Surface properties

Identification of the surface sites and characterization of their properties were carried out by FTIRS using CO as the test molecule. Figure 10 presents spectra of CO adsorbed on 50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 at −196°C with pressure variation from 0.1 to 10 Torr. Bands at 2,148 and 2,160 cm−1 correspond to CO adsorption on different cations and OH-groups, while the band at 2,139 cm−1 can be assigned to physically adsorbed CO [13,14]. Low intensity bands at 2,065 and 2,080 cm−1 correspond to CO complexes with metal sites, apparently, Ni0 [15,17].

Figure 10 Spectra of CO adsorbed on the 50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 sample at −196°C and 0.1–10 Torr pressure.
Figure 10

Spectra of CO adsorbed on the 50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 sample at −196°C and 0.1–10 Torr pressure.

The band at 2,080 cm−1 shifts to 2,090 cm−1 with the increase of CO pressure. After heating the sample to room temperature, the bands of adsorbed CO were not revealed.

Figure 11 presents spectra of CO adsorbed on the (5% Ni + 1% Ru)/MgAl2O4 + LaFe0.7Ni0.3O3 sample at −196°C and 0.1–10 Torr CO pressure. Bands at 2,158 and 2,170 cm−1 characterize CO adsorption on the support centers, while bands at 1,945, 2,045, and 2,080 cm−1 correspond to CO adsorbed on metal sites [13,14,15].

Figure 11 Spectra of CO adsorbed on the (5% Ni + 1% Ru)/50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 sample at −196°C and 0.1–10 Torr pressure.
Figure 11

Spectra of CO adsorbed on the (5% Ni + 1% Ru)/50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 sample at −196°C and 0.1–10 Torr pressure.

Bands at 2,045 and 2,080 cm−1 are due to terminal CO complexes, while the band at 1,945 cm−1 refers to bridging carbonyls [16,17]. As expected, the intensity of bands corresponding to CO adsorbed on metal sites for the supported Ru + Ni catalyst is much higher than that for the initial 50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 nanocomposite. After heating the sample from liquid nitrogen temperature to room temperature, a broad band with a maximum at 2,065 cm−1 remains in the spectrum (Figure 12). Deconvolution of this band into Gaussian components revealed 4 bands with maxima at 1,965, 2,020, 2,050, and 2,073 cm−1. The first band corresponds to the bridging form of CO adsorption on metal sites, while the other three refer to terminal complexes. The estimated concentration of metal sites is equal to 6 and 11 μmol/g for bridging and terminal carbonyls, respectively.

Figure 12 FTIR spectrum of CO adsorbed on the (5% Ni + 1% Ru)/50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 sample at room temperature and 10 Torr CO pressure; the decomposition into Gaussian components is shown.
Figure 12

FTIR spectrum of CO adsorbed on the (5% Ni + 1% Ru)/50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 sample at room temperature and 10 Torr CO pressure; the decomposition into Gaussian components is shown.

Figure 13 presents FTIR spectra of CO adsorbed on the Ni + Ru/MgAl2O4 + PrFe0.75Ni0.25O3 sample at −196°C with pressure variation from 0.1 to 10 Torr. Bands at 2,158, 2,165, and 2,215 cm−1 characterize CO adsorption on support sites [13,14], while the bands at 2,040 and 2,080 cm−1 correspond to CO adsorbed on metal sites as terminal carbonyls [15,16,17]. The band at 2,080 cm−1 with the increase in CO pressure shifts to 2,090 cm−1, which is typical for CO adsorbed in a linear configuration on metal planes.

Figure 13 FTIR spectra of CO adsorbed on the Ni + Ru/50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 sample at −196°C and 0.1–10 Torr pressure.
Figure 13

FTIR spectra of CO adsorbed on the Ni + Ru/50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 sample at −196°C and 0.1–10 Torr pressure.

When the sample was heated from the liquid nitrogen temperature to room temperature (Figure 14), the band with the maximum at 2,058 cm–1 remained in the FTIR spectrum.

Figure 14 FTIR spectra of CO adsorbed on the Ni + Ru/50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 sample at room temperature and 10 Torr CO pressure.
Figure 14

FTIR spectra of CO adsorbed on the Ni + Ru/50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 sample at room temperature and 10 Torr CO pressure.

Deconvolution of this band into Gaussian components revealed the bands with maxima at 1,995, 2,043, 2,058, and 2,080 cm–1. The first band corresponds to bridging forms of CO adsorption on metal particles, while the other three to terminal ones on isolated metal sites with different local environments [15,16,17,18]. The estimated concentration of surface sites is equal to 3 and 11 μmol/g for bridging and terminal carbonyls, respectively. A higher share of terminal carbonyls for Pr-containing catalysts apparently correlates with a higher specific area as well as with a higher nanocomposite support disordering, which helps to provide a higher Ni and Ru dispersion and a higher degree of metal–support interaction, leading to decoration of the surface of Ni/Ru nanoparticles/clusters by oxidic fragments. Note that for both catalysts, the density of isolated metal sites stabilizing terminal carbonyls (11 μmol/g) is quite close to that for catalysts NiRu/PrCeZrO/MgAl1.9Me0.1O4 (Me = Ti, Fe, Cr) (in the range of 9.5–14 μmol/g) with higher SSAs (85–110 m2/g) at the same amount of supported metal 5% Ni + 1% Ru [11]. Hence, disordering of the surface layers of nanocomposite supports indeed helps to provide a high dispersion of supported metals and a high density of isolated metal sites even for the case of somewhat lower SSA.

3.3 H2-TPR analysis

H2-TPR curves for both catalysts (Figure 15) contain two narrow peaks in the range of 200–300°C corresponding to the reduction of RuO2 and NiO nanoparticles and their mixed clusters conjugated with a reduction of Pr and Fe cations in the surface layer [9,10,11]. The higher intensity of the peak at ∼250°C for the Pr-containing catalyst is explained by a smaller content of pure RuO2 particles due to a stronger interaction between Pr and Ni oxidic species forming surface nanoparticles of Pr nickelates including Ru cations, as well as a high reactivity of surface oxygen species bound with Pr4+ cations. Broad peaks in the range of 400–900°C are related to the reduction of both perovskite phases, NiMgO phase, as well as Fe and Ni cations incorporated into the bulk of MgAl2O4 particles [9,10,11]. The lower intensity of this peak for the Pr-containing catalyst apparently correlates with the absence of the bulk PrFe0.75Ni0.25O3 phase in the support.

Figure 15 H2 TPR curves for (5% Ni + 1% Ru)/50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 (a) and (5% Ni + 1% Ru)/50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 (b) catalysts.
Figure 15

H2 TPR curves for (5% Ni + 1% Ru)/50% MgAl2O4 + 50% LaFe0.7Ni0.3O3 (a) and (5% Ni + 1% Ru)/50% MgAl2O4 + 50% PrFe0.75Ni0.25O3 (b) catalysts.

3.4 Catalytic activity

Figures 16 and 17 present temperature dependencies of ESR product concentrations. At each temperature, the performance was stable not suffering from any decline, which is explained by coking and sintering stability typical for nanocomposite active components based on mesoporous MgAl2O4. Hence, a one-pot synthesis route of nanocomposites used in this work has not deteriorated such important advantage of these catalysts. At 550°C, the concentration of hydrogen is higher for the Pr-containing catalyst, which correlates with a higher share of CO2 in products. This can be explained by a higher activity of this catalyst in the water gas shift reaction due to the positive effect of Pr cations, which also helps to provide a higher activity in ethanol reforming (a higher total concentration of products CO + CO2 + CH4) despite the identical density of isolated active metal sites stabilizing terminal carbonyls (vide supra). Although, for this catalyst hydrogen content increases with temperature correlating with the decrease of the methane byproduct content (Figure 16), at 700°C, it is slightly less than that observed for the La-containing catalyst (∼7% versus ∼8.6%). This apparently correlates with the decrease of CO2 content with temperature due to the effect of the reverse water gas shift reaction, while for the La-containing catalyst the CO2 concentration is nearly constant due to less efficiency in this reaction.

Figure 16 Temperature dependencies of reaction product concentrations in the process of ESR on the Ru + Ni/(MgAl2O4 + PrFe0.7Ni0.3O3) catalyst. Feed: 2% EtOH + 8% H2O + N2; contact time: 10 ms.
Figure 16

Temperature dependencies of reaction product concentrations in the process of ESR on the Ru + Ni/(MgAl2O4 + PrFe0.7Ni0.3O3) catalyst. Feed: 2% EtOH + 8% H2O + N2; contact time: 10 ms.

Figure 17 Temperature dependencies of reaction product concentrations in the process of ESR on the Ru + Ni/(MgAl2O4 + LaFe0.7Ni0.3O3) catalyst. Feed: 2% EtOH + 8% H2O + N2; contact time: 10 ms.
Figure 17

Temperature dependencies of reaction product concentrations in the process of ESR on the Ru + Ni/(MgAl2O4 + LaFe0.7Ni0.3O3) catalyst. Feed: 2% EtOH + 8% H2O + N2; contact time: 10 ms.

In Table 3, a comparison of the performance of nanocomposite catalysts prepared in this work as well as those containing Ni on different supports [11,19,20,21,22] is presented. In the intermediate temperature range, the hydrogen yield and effective rate constants for nanocomposite catalysts prepared in this work using a simplified one-pot procedure are good being close to those for catalysts on doped MgAl2O4, which are among the most active and stable Ni-based catalysts of fuel reforming [11]. The higher activity of 5% Ni + 1% Ru/(MgAl2O4 + PrFe0.7Ni0.3O3) catalyst is explained by the formation of disordered Pr nickelate fragments which strongly interact with the Fe-modified spinel support. The interaction of Pr cations with metal alloy nanoparticles as well as their presence in the oxide support surface layer provide higher efficiency of ethanol activation as well as a higher concentration of reactive oxygen species on the support [3,8] which ensure the higher activity of the Pr-containing catalyst compared with that containing La. This agrees with the high activity of the 5% Ni/50% Pr0.15Sm0.15Ce0.35Zr0.35O2 + 50% LaMn0.9Ru0.1O3 catalyst [19] also containing Pr cations. The good performance of the 2% Ni + 2% Ru/MnCr2O4 catalyst is explained by the high dispersion of Ni-Ru alloy nanoparticles, which strongly interact with the MnCr2O4 support, and the high oxygen mobility and reactivity [22]. The lower performance of 10 wt% CuNiCr/10 wt% CeZrPrO/Al2O3 [21] is apparently explained by the low surface concentration of Ni and Pr cations incorporated into the bulk of alumina support. Note that the NiAlVOx catalyst based on layered Ni-Al-O hydrotalcite with a high Ni content at 500°C provides complete ethanol conversion with a low hydrogen yield due to domination of byproducts such as acetaldehyde, ethylene, and dimethyl ether due to the absence of other transition metal or rare earth cations having the ability to provide a high surface concentration of reactive oxygen species required to convert intermediates into syngas [20].

Table 3

Comparison of catalyst performance in ESR

Catalyst SSA. (m2/)g Feed, contact time T (°C) X EtOH (%) K eff (s–1) H2 yield (%) Ref.
5% Ni + 1% Ru/(MgAl2O4 + LaFe0.7Ni0.3O3) 42 2% EtOH + 8% H2O + N2, 10 ms 550 80 160 38 This work
5% Ni + 1% Ru/(MgAl2O4 + PrFe0.7Ni0.3O3) 83 2% EtOH + 8% H2O + N2, 10 ms 550 83 180 46 This work
5% Ni + 1% Ru/10% Pr0.3Ce0.35Zr0.35O2/MgAl1.9Cr0.1O4 86 2% EtOH + 8% H2O + N2, 8 ms 500 40 51 47 11
5% Ni + 1% Ru/Pr0.3Ce0.35Zr0.35O2/MgAl1.9Fe0.1O4 85 2% EtOH + 8% H2O + N2, 8 ms 550 98 — 51 11
NiAlVOx (Ni:Al:V = 2.07:1:0.43) 294 10% EtOH + 40% H2O + N2, 70 ms 400 60 13 5 20
500 100 — 20
10 wt% CuNiCr/10 wt% CeZrPrO/Al2O3 100 10% EtOH + 40% H2O + N2, 72 ms 650 31 5 5 21
5% Ni/50% Pr0.15Sm0.15Ce0.35Zr0.35O2 + 50% LaMn0.9Ru0.1O3 21 2% EtOH + 8% H2O + N2, 10 ms 500 80 160 32 19
2% Ni + 2% Ru/MnCr2O4 77 10% EtOH + 40% H2O + He, 70 ms 500 92 36 68 22

4 Discussion

Herein, a simple and cost-effective one-pot procedure of nanocomposite (MgAl2O4 + LnFe0.7Ni0.3O3) preparation with subsequent loading of Ni + Ru on the support by co-impregnation allowed us to obtain efficient and stable to coking catalysts for ESR, which was provided by the optimized interaction between spinel and perovskite phases. Although these catalysts were tested here only in diluted feed, for mesoporous catalysts based on the MgAl2O4 support, our previous studies demonstrated that a high and stable performance in this reaction in diluted feed reliably correlates with the high activity and coking/sintering stability in concentrated feeds in other reactions such as methane steam/dry reforming and biofuel steam/autothermal reforming [10,11]. This apparently provides good prospects of this preparation procedure for the design of mesoporous nanocomposite active components for structured catalysts of fuel transformation into syngas. Moreover, since a comparison of performance in reactions of methane dry reforming and ESR of our catalysts based on a doped MgAl2O4 support with that of other catalysts presented in a lot of published papers demonstrated much higher specific catalytic activity [11], there is clearly a good chance of their broad practical application, with due regard for their cost-effective composition and preparation procedure. Further studies will be devoted to improving catalysts by increasing their SSA, oxygen mobility, and reactivity by variation of their chemical composition and synthesis procedures. The first step is changing the perovskite composition by removing nickel (this will increase perovskite structure stability under reducing conditions), replacing a part of Fe by a combination of Mn, Cr, and Ti and using a combination of La, Pr, and Sm instead of pure La or Pr. This will help create high entropy perovskite nanoparticles possessing higher stability along with higher oxygen mobility [23,24]. To increase the SSA, the content of perovskites in nanocomposites can be somewhat decreased (up to 40 wt%), but a part of Al (up to 10%) in spinel can be replaced by Fe, Cr, and Ti [11] or their combinations to ensure stability of perovskites phases in these nanocomposites. The second step is optimization of the one-pot synthesis procedure with application of spray drying of polymeric solution and calcination of nanopowders in a tubular reactor in the air stream, which will help prevent nanoparticle sintering. The next logistic step is supporting optimized active components on structured heat-conducting substrates from their suspensions and their testing in fuel reforming into syngas in concentrated feeds [10,14].

5 Conclusions

A cost-effective one-pot procedure of mesoporous nanocomposite MgAl2O4 + LnFe0.7Ni0.3O3 (Ln = La, Pr) synthesis with the Pluronic P123 copolymer was applied for the first time. A disordered structure of obtained nanocomposites was formed due to incorporation of transition metal cations into the spinel structure. This provides strong interaction of the Ni + Ru active components loaded by wet co-impregnation with these nanocomposite supports, leading to uniform spatial distribution and decoration of metal alloy nanoparticles in reduced catalysts by oxidic fragments. This leads to a developed metal–support interface and domination of single surface metal centers, as demonstrated by a unique and reliable method such as FTIRS of adsorbed CO. The ESR reaction results in high catalytic activity close to that of best catalysts based on MgAl2O4 and stability to coking. A higher yield of hydrogen at 550°C for the Pr-containing catalyst is obtained by the higher reactivity of surface oxygen species bound with Pr cations.

  1. Funding information: This work was supported by the project FWUR-2024-0033 of the Russian Federation Ministry of Science and Higher Education. The authors acknowledge the Shared Research Center “VTAN” of the Novosibirsk State University supported by the Ministry of Science and Higher Education of the Russian Federation by agreement #075-12-2021-697 for TEM investigations.

  2. Author contributions: Conceptualization: V.S. and B.M.; investigation: N.T., J.F., N.G., T.K., V.R., and A.I.; writing – original draft preparation: N.T., T.G., and T.K.; writing – review and editing: V.S.; supervision: V.S. and B.M. All authors have read and agreed to the published version of the manuscript.

  3. Conflict of interest: The authors declare no conflicts of interest.

  4. Ethical approval: The conducted research is not related to either human or animal use.

  5. Data availability statement: All data generated or analyzed during this study are included in this published article.

References

[1] Xu X, Zhou Q, Yu D. The future of hydrogen energy: bio-hydrogen production technology. Int J Hydrog Energy. 2022;47:33677–98. 10.1016/j.ijhydene.2022.07.261.Search in Google Scholar

[2] Ogo Sh, Sekine Ya. Recent progress in ethanol steam reforming using non-noble transition metal catalysts: a review. Fuel Process Technol. 2020;199:106–238. 10.1016/j.fuproc.2019.106238.Search in Google Scholar

[3] Sadykov VA, Arapova MV, Smal EA, Pavlova SN, Bobrova LN, Eremeev NF, et al. Nanocomposite catalysts for transformation of biofuels into syngas and hydrogen: Fundamentals of design and performance, application in structured reactors and catalytic membranes. Catalysis. 2019;31:216–41. 10.1039/9781788016971-00216.Search in Google Scholar

[4] Sadykov VA, Eremeev NF, Sadovskaya EM, Chesalov YA, Pavlova SN, Rogov VA, et al. Detailed mechanism of ethanol transformation into syngas on catalysts based on mesoporous MgAl2O4 support loaded with Ru+Ni/(PrCeZrO or MnCr2O4) active components. Top Catal. 2020;63:166–77. 10.1007/s11244-020-01222-1.Search in Google Scholar

[5] Guo J, Cai R, Cali E, Wilson GE, Kerherve G, Haigh SJ, et al. Low-temperature exsolution of Ni–Ru bimetallic nanoparticles from A-site deficient double perovskites. Small. 2022;18:2107020. 10.1002/smll.202107020.Search in Google Scholar PubMed

[6] Roh H-S, Potdar H, Jun K-W, Kim J-W, Oh Y-S. Carbon dioxide reforming of methane over Ni incorporated into Ce–ZrO2 catalysts. Appl Catal A Gen. 2004;276:231–9. 10.1016/j.apcata.2004.08.009.Search in Google Scholar

[7] Sadykov V, Bobrova L, Pavlova S, Simagina V, Makarshin L, Parmon V, et al. Syngas generation from hydrocarbons and oxygenates with structured catalysts. Series energy science, engineering and technology. New York: Nova Science Publishers, Inc; 2012. p. 140.Search in Google Scholar

[8] Pavlova S, Kapokova L, Bunina R, Alikina G, Sazonova N, Krieger T, et al. Syngas production by CO2 reforming of methane using LnFeNi(Ru)O3 perovskites as precursors of robust catalysts. Catal Sci Technol. 2012;2:2099–108. 10.1039/C2CY20054F.Search in Google Scholar

[9] Naurzkulova SM, Arapova MV, Ishchenko AV, Krieger TA, Saraev AA, Kaichev VV, et al. Ni–Ru-containing mixed oxide-based composites as precursors for ethanol steam reforming catalysts: Effect of the synthesis methods on the structural and catalytic properties. Open Chem. 2021;19:696–708. 10.1515/chem-2021-0062.Search in Google Scholar

[10] Sadykov V, Pavlova S, Fedorova J, Bobin A, Fedorova V, Simonov M, et al. Structured catalysts with mesoporous nanocomposite active components loaded on heat-conducting substrates for transformation of biogas/biofuels into syngas. Cat Today. 2021;379:166–80. 10.1016/j.cattod.2020.10.017.Search in Google Scholar

[11] Sadykov VA, Eremeev NF, Sadovskaya EM, Fedorova JE, Arapova MV, Bobrova LN, et al. Approaches to the design of efficient and stable catalysts for biofuel reforming into syngas: Doping the mesoporous MgAl2O4 support with transition metal cations. Dalton Trans. 2023;52:8756. 10.1039/d3dt00830d.Search in Google Scholar PubMed

[12] Paukshtis EA, Yurchenko EN. Study of the acid-base properties of heterogeneous catalysts by infrared spectroscopy. Russ Chem Rev. 1983;52:242–58. 10.1070/RC1983v052n03ABEH002812.Search in Google Scholar

[13] Coluccia S, Baricco M, Marchese L, Martra G, Zecchina A. Surface morphology and reactivity towards CO of MgO particles: FTIR and HRTEM studies. Spectrochim Acta A. 1993;49:1289–98. 10.1016/0584-8539(93)80036-A.Search in Google Scholar

[14] Sadykov V, Pavlova S, Smal E, Arapova M, Simonov M, Mezentseva N, et al. Structured catalysts for biofuels transformation into syngas with active components based on perovskite and spinel oxides supported on Mg-doped alumina. Catal Today. 2017;293–294:176–85. 10.1016/j.cattod.2017.05.055.Search in Google Scholar

[15] Hadjiivanov K, Mihaylov M, Abadjieva N, Klissurski D. Characterization of Ni/TiO2 catalysts prepared by successive adsorption-reduction of Ni2+ ions. J Chem Soc Faraday Trans. 1998;94:3711–6. 10.1039/A804978E.Search in Google Scholar

[16] Jensen MB, Morandi S, Prinetto F, Olafsen Sjastad A, Olsbye U, Ghiotti G. FTIR characterization of supported Ni-catalysts: Influence of different supports on the metal phase properties. Catal Today. 2012;197:38–49. 10.1016/j.cattod.2012.06.016.Search in Google Scholar

[17] Chen HW, Zhong Z, White JM. CO chemisorption on Ru/SiO2: The influence of coadsorbates. J Catal. 1984;90:119–26. 10.1016/0021-9517(84)90092-7.Search in Google Scholar

[18] Mihaylov M, Lagunov O, Ivanova E, Hadjiivanov K. Determination of polycarbonyl species on nickel-containing catalysts by adsorption of CO isotopic mixtures. Top Catal. 2011;54:308–17. 10.1007/s11244-011-9661-6.Search in Google Scholar

[19] Arapova M, Naurzkulova S, Krieger T, Rogov V, Sadykov V. Efficient catalysts of ethanol steam reforming based on perovskite-fluorite nanocomposites with supported Ni: Effect of the synthesis methods on the activity and stability. Catalysts. 2022;12:1151. 10.3390/catal12101151.Search in Google Scholar

[20] Korneeva EV, Kardash TY, Rogov VA, Smal EA, Sadykov VA. Catalytic steam reforming of ethanol over W-, V-, or Nb–modified Ni-Al-O hydrotalcite-type precursors. Catal Sustain Energy. 2017;4:17. 10.1515/cse-2017-0004.Search in Google Scholar

[21] Yaseneva P, Pavlova S, Sadykov V, Alikina G, Lukashevich A, Rogov V, et al. Combinatorial approach to the preparation and characterization of catalysts for biomass steam reforming into syngas. Cat Today. 2008;137:23. 10.1016/j.cattod.2008.03.016.Search in Google Scholar

[22] Smal EA, Simonov MN, Mezentseva NV, Krieger TA, Larina TV, Saraev AA, et al. Spinel-type MnxCr3-xO4-based catalysts for ethanol steam reforming. Appl Catal B: Environ. 2021;283:119656. 10.1016/j.apcatb.2020.119656.Search in Google Scholar

[23] Wang Y, Liu J, Song Y, Yu J, Tian Y, Robson MJ, et al. High-entropy perovskites for energy conversion and storage: Design, synthesis, and potential applications. Small Methods. 2023;7:2201138. 10.1002/smtd.202201138.Search in Google Scholar PubMed

[24] Pretschuh P, Egger A, Bucher E. Crystal structure, electronic conductivity and oxygen exchange kinetics of high-entropy perovskites La0.2Pr0.2Nd0.2Sm0.2Sr0.2Co1-xFexO3-δ (x = 0, 0.5, 1). Solid State Ion. 2024;417:116705. 10.1016/j.ssi.2024.116705.Search in Google Scholar
Received: 2024-09-09
Revised: 2024-11-10
Accepted: 2024-11-18
Published Online: 2024-12-11

© 2024 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

Articles in the same Issue

  1. Regular Articles
  2. Porous silicon nanostructures: Synthesis, characterization, and their antifungal activity
  3. Biochar from de-oiled Chlorella vulgaris and its adsorption on antibiotics
  4. Phytochemicals profiling, in vitro and in vivo antidiabetic activity, and in silico studies on Ajuga iva (L.) Schreb.: A comprehensive approach
  5. Synthesis, characterization, in silico and in vitro studies of novel glycoconjugates as potential antibacterial, antifungal, and antileishmanial agents
  6. Sonochemical synthesis of gold nanoparticles mediated by potato starch: Its performance in the treatment of esophageal cancer
  7. Computational study of ADME-Tox prediction of selected phytochemicals from Punica granatum peels
  8. Phytochemical analysis, in vitro antioxidant and antifungal activities of extracts and essential oil derived from Artemisia herba-alba Asso
  9. Two triazole-based coordination polymers: Synthesis and crystal structure characterization
  10. Phytochemical and physicochemical studies of different apple varieties grown in Morocco
  11. Synthesis of multi-template molecularly imprinted polymers (MT-MIPs) for isolating ethyl para-methoxycinnamate and ethyl cinnamate from Kaempferia galanga L., extract with methacrylic acid as functional monomer
  12. Nutraceutical potential of Mesembryanthemum forsskaolii Hochst. ex Bioss.: Insights into its nutritional composition, phytochemical contents, and antioxidant activity
  13. Evaluation of influence of Butea monosperma floral extract on inflammatory biomarkers
  14. Cannabis sativa L. essential oil: Chemical composition, anti-oxidant, anti-microbial properties, and acute toxicity: In vitro, in vivo, and in silico study
  15. The effect of gamma radiation on 5-hydroxymethylfurfural conversion in water and dimethyl sulfoxide
  16. Hollow mushroom nanomaterials for potentiometric sensing of Pb2+ ions in water via the intercalation of iodide ions into the polypyrrole matrix
  17. Determination of essential oil and chemical composition of St. John’s Wort
  18. Computational design and in vitro assay of lantadene-based novel inhibitors of NS3 protease of dengue virus
  19. Anti-parasitic activity and computational studies on a novel labdane diterpene from the roots of Vachellia nilotica
  20. Microbial dynamics and dehydrogenase activity in tomato (Lycopersicon esculentum Mill.) rhizospheres: Impacts on growth and soil health across different soil types
  21. Correlation between in vitro anti-urease activity and in silico molecular modeling approach of novel imidazopyridine–oxadiazole hybrids derivatives
  22. Spatial mapping of indoor air quality in a light metro system using the geographic information system method
  23. Iron indices and hemogram in renal anemia and the improvement with Tribulus terrestris green-formulated silver nanoparticles applied on rat model
  24. Integrated track of nano-informatics coupling with the enrichment concept in developing a novel nanoparticle targeting ERK protein in Naegleria fowleri
  25. Cytotoxic and phytochemical screening of Solanum lycopersicum–Daucus carota hydro-ethanolic extract and in silico evaluation of its lycopene content as anticancer agent
  26. Protective activities of silver nanoparticles containing Panax japonicus on apoptotic, inflammatory, and oxidative alterations in isoproterenol-induced cardiotoxicity
  27. pH-based colorimetric detection of monofunctional aldehydes in liquid and gas phases
  28. Investigating the effect of resveratrol on apoptosis and regulation of gene expression of Caco-2 cells: Unravelling potential implications for colorectal cancer treatment
  29. Metformin inhibits knee osteoarthritis induced by type 2 diabetes mellitus in rats: S100A8/9 and S100A12 as players and therapeutic targets
  30. Effect of silver nanoparticles formulated by Silybum marianum on menopausal urinary incontinence in ovariectomized rats
  31. Synthesis of new analogs of N-substituted(benzoylamino)-1,2,3,6-tetrahydropyridines
  32. Response of yield and quality of Japonica rice to different gradients of moisture deficit at grain-filling stage in cold regions
  33. Preparation of an inclusion complex of nickel-based β-cyclodextrin: Characterization and accelerating the osteoarthritis articular cartilage repair
  34. Empagliflozin-loaded nanomicelles responsive to reactive oxygen species for renal ischemia/reperfusion injury protection
  35. Preparation and pharmacodynamic evaluation of sodium aescinate solid lipid nanoparticles
  36. Assessment of potentially toxic elements and health risks of agricultural soil in Southwest Riyadh, Saudi Arabia
  37. Theoretical investigation of hydrogen-rich fuel production through ammonia decomposition
  38. Biosynthesis and screening of cobalt nanoparticles using citrus species for antimicrobial activity
  39. Investigating the interplay of genetic variations, MCP-1 polymorphism, and docking with phytochemical inhibitors for combatting dengue virus pathogenicity through in silico analysis
  40. Ultrasound induced biosynthesis of silver nanoparticles embedded into chitosan polymers: Investigation of its anti-cutaneous squamous cell carcinoma effects
  41. Copper oxide nanoparticles-mediated Heliotropium bacciferum leaf extract: Antifungal activity and molecular docking assays against strawberry pathogens
  42. Sprouted wheat flour for improving physical, chemical, rheological, microbial load, and quality properties of fino bread
  43. Comparative toxicity assessment of fisetin-aided artificial intelligence-assisted drug design targeting epibulbar dermoid through phytochemicals
  44. Acute toxicity and anti-inflammatory activity of bis-thiourea derivatives
  45. Anti-diabetic activity-guided isolation of α-amylase and α-glucosidase inhibitory terpenes from Capsella bursa-pastoris Linn.
  46. GC–MS analysis of Lactobacillus plantarum YW11 metabolites and its computational analysis on familial pulmonary fibrosis hub genes
  47. Green formulation of copper nanoparticles by Pistacia khinjuk leaf aqueous extract: Introducing a novel chemotherapeutic drug for the treatment of prostate cancer
  48. Improved photocatalytic properties of WO3 nanoparticles for Malachite green dye degradation under visible light irradiation: An effect of La doping
  49. One-pot synthesis of a network of Mn2O3–MnO2–poly(m-methylaniline) composite nanorods on a polypyrrole film presents a promising and efficient optoelectronic and solar cell device
  50. Groundwater quality and health risk assessment of nitrate and fluoride in Al Qaseem area, Saudi Arabia
  51. A comparative study of the antifungal efficacy and phytochemical composition of date palm leaflet extracts
  52. Processing of alcohol pomelo beverage (Citrus grandis (L.) Osbeck) using saccharomyces yeast: Optimization, physicochemical quality, and sensory characteristics
  53. Specialized compounds of four Cameroonian spices: Isolation, characterization, and in silico evaluation as prospective SARS-CoV-2 inhibitors
  54. Identification of a novel drug target in Porphyromonas gingivalis by a computational genome analysis approach
  55. Physico-chemical properties and durability of a fly-ash-based geopolymer
  56. FMS-like tyrosine kinase 3 inhibitory potentials of some phytochemicals from anti-leukemic plants using computational chemical methodologies
  57. Wild Thymus zygis L. ssp. gracilis and Eucalyptus camaldulensis Dehnh.: Chemical composition, antioxidant and antibacterial activities of essential oils
  58. 3D-QSAR, molecular docking, ADMET, simulation dynamic, and retrosynthesis studies on new styrylquinolines derivatives against breast cancer
  59. Deciphering the influenza neuraminidase inhibitory potential of naturally occurring biflavonoids: An in silico approach
  60. Determination of heavy elements in agricultural regions, Saudi Arabia
  61. Synthesis and characterization of antioxidant-enriched Moringa oil-based edible oleogel
  62. Ameliorative effects of thistle and thyme honeys on cyclophosphamide-induced toxicity in mice
  63. Study of phytochemical compound and antipyretic activity of Chenopodium ambrosioides L. fractions
  64. Investigating the adsorption mechanism of zinc chloride-modified porous carbon for sulfadiazine removal from water
  65. Performance repair of building materials using alumina and silica composite nanomaterials with electrodynamic properties
  66. Effects of nanoparticles on the activity and resistance genes of anaerobic digestion enzymes in livestock and poultry manure containing the antibiotic tetracycline
  67. Effect of copper nanoparticles green-synthesized using Ocimum basilicum against Pseudomonas aeruginosa in mice lung infection model
  68. Cardioprotective effects of nanoparticles green formulated by Spinacia oleracea extract on isoproterenol-induced myocardial infarction in mice by the determination of PPAR-γ/NF-κB pathway
  69. Anti-OTC antibody-conjugated fluorescent magnetic/silica and fluorescent hybrid silica nanoparticles for oxytetracycline detection
  70. Curcumin conjugated zinc nanoparticles for the treatment of myocardial infarction
  71. Identification and in silico screening of natural phloroglucinols as potential PI3Kα inhibitors: A computational approach for drug discovery
  72. Exploring the phytochemical profile and antioxidant evaluation: Molecular docking and ADMET analysis of main compounds from three Solanum species in Saudi Arabia
  73. Unveiling the molecular composition and biological properties of essential oil derived from the leaves of wild Mentha aquatica L.: A comprehensive in vitro and in silico exploration
  74. Analysis of bioactive compounds present in Boerhavia elegans seeds by GC-MS
  75. Homology modeling and molecular docking study of corticotrophin-releasing hormone: An approach to treat stress-related diseases
  76. LncRNA MIR17HG alleviates heart failure via targeting MIR17HG/miR-153-3p/SIRT1 axis in in vitro model
  77. Development and validation of a stability indicating UPLC-DAD method coupled with MS-TQD for ramipril and thymoquinone in bioactive SNEDDS with in silico toxicity analysis of ramipril degradation products
  78. Biosynthesis of Ag/Cu nanocomposite mediated by Curcuma longa: Evaluation of its antibacterial properties against oral pathogens
  79. Development of AMBER-compliant transferable force field parameters for polytetrafluoroethylene
  80. Treatment of gestational diabetes by Acroptilon repens leaf aqueous extract green-formulated iron nanoparticles in rats
  81. Development and characterization of new ecological adsorbents based on cardoon wastes: Application to brilliant green adsorption
  82. A fast, sensitive, greener, and stability-indicating HPLC method for the standardization and quantitative determination of chlorhexidine acetate in commercial products
  83. Assessment of Se, As, Cd, Cr, Hg, and Pb content status in Ankang tea plantations of China
  84. Effect of transition metal chloride (ZnCl2) on low-temperature pyrolysis of high ash bituminous coal
  85. Evaluating polyphenol and ascorbic acid contents, tannin removal ability, and physical properties during hydrolysis and convective hot-air drying of cashew apple powder
  86. Development and characterization of functional low-fat frozen dairy dessert enhanced with dried lemongrass powder
  87. Scrutinizing the effect of additive and synergistic antibiotics against carbapenem-resistant Pseudomonas aeruginosa
  88. Preparation, characterization, and determination of the therapeutic effects of copper nanoparticles green-formulated by Pistacia atlantica in diabetes-induced cardiac dysfunction in rat
  89. Antioxidant and antidiabetic potentials of methoxy-substituted Schiff bases using in vitro, in vivo, and molecular simulation approaches
  90. Anti-melanoma cancer activity and chemical profile of the essential oil of Seseli yunnanense Franch
  91. Molecular docking analysis of subtilisin-like alkaline serine protease (SLASP) and laccase with natural biopolymers
  92. Overcoming methicillin resistance by methicillin-resistant Staphylococcus aureus: Computational evaluation of napthyridine and oxadiazoles compounds for potential dual inhibition of PBP-2a and FemA proteins
  93. Exploring novel antitubercular agents: Innovative design of 2,3-diaryl-quinoxalines targeting DprE1 for effective tuberculosis treatment
  94. Drimia maritima flowers as a source of biologically potent components: Optimization of bioactive compound extractions, isolation, UPLC–ESI–MS/MS, and pharmacological properties
  95. Estimating molecular properties, drug-likeness, cardiotoxic risk, liability profile, and molecular docking study to characterize binding process of key phyto-compounds against serotonin 5-HT2A receptor
  96. Fabrication of β-cyclodextrin-based microgels for enhancing solubility of Terbinafine: An in-vitro and in-vivo toxicological evaluation
  97. Phyto-mediated synthesis of ZnO nanoparticles and their sunlight-driven photocatalytic degradation of cationic and anionic dyes
  98. Monosodium glutamate induces hypothalamic–pituitary–adrenal axis hyperactivation, glucocorticoid receptors down-regulation, and systemic inflammatory response in young male rats: Impact on miR-155 and miR-218
  99. Quality control analyses of selected honey samples from Serbia based on their mineral and flavonoid profiles, and the invertase activity
  100. Eco-friendly synthesis of silver nanoparticles using Phyllanthus niruri leaf extract: Assessment of antimicrobial activity, effectiveness on tropical neglected mosquito vector control, and biocompatibility using a fibroblast cell line model
  101. Green synthesis of silver nanoparticles containing Cichorium intybus to treat the sepsis-induced DNA damage in the liver of Wistar albino rats
  102. Quality changes of durian pulp (Durio ziberhinus Murr.) in cold storage
  103. Study on recrystallization process of nitroguanidine by directly adding cold water to control temperature
  104. Determination of heavy metals and health risk assessment in drinking water in Bukayriyah City, Saudi Arabia
  105. Larvicidal properties of essential oils of three Artemisia species against the chemically insecticide-resistant Nile fever vector Culex pipiens (L.) (Diptera: Culicidae): In vitro and in silico studies
  106. Design, synthesis, characterization, and theoretical calculations, along with in silico and in vitro antimicrobial proprieties of new isoxazole-amide conjugates
  107. The impact of drying and extraction methods on total lipid, fatty acid profile, and cytotoxicity of Tenebrio molitor larvae
  108. A zinc oxide–tin oxide–nerolidol hybrid nanomaterial: Efficacy against esophageal squamous cell carcinoma
  109. Research on technological process for production of muskmelon juice (Cucumis melo L.)
  110. Physicochemical components, antioxidant activity, and predictive models for quality of soursop tea (Annona muricata L.) during heat pump drying
  111. Characterization and application of Fe1−xCoxFe2O4 nanoparticles in Direct Red 79 adsorption
  112. Torilis arvensis ethanolic extract: Phytochemical analysis, antifungal efficacy, and cytotoxicity properties
  113. Magnetite–poly-1H pyrrole dendritic nanocomposite seeded on poly-1H pyrrole: A promising photocathode for green hydrogen generation from sanitation water without using external sacrificing agent
  114. HPLC and GC–MS analyses of phytochemical compounds in Haloxylon salicornicum extract: Antibacterial and antifungal activity assessment of phytopathogens
  115. Efficient and stable to coking catalysts of ethanol steam reforming comprised of Ni + Ru loaded on MgAl2O4 + LnFe0.7Ni0.3O3 (Ln = La, Pr) nanocomposites prepared via cost-effective procedure with Pluronic P123 copolymer
  116. Nitrogen and boron co-doped carbon dots probe for selectively detecting Hg2+ in water samples and the detection mechanism
  117. Heavy metals in road dust from typical old industrial areas of Wuhan: Seasonal distribution and bioaccessibility-based health risk assessment
  118. Phytochemical profiling and bioactivity evaluation of CBD- and THC-enriched Cannabis sativa extracts: In vitro and in silico investigation of antioxidant and anti-inflammatory effects
  119. Investigating dye adsorption: The role of surface-modified montmorillonite nanoclay in kinetics, isotherms, and thermodynamics
  120. Antimicrobial activity, induction of ROS generation in HepG2 liver cancer cells, and chemical composition of Pterospermum heterophyllum
  121. Study on the performance of nanoparticle-modified PVDF membrane in delaying membrane aging
  122. Impact of cholesterol in encapsulated vitamin E acetate within cocoliposomes
  123. Review Articles
  124. Structural aspects of Pt(η3-X1N1X2)(PL) (X1,2 = O, C, or Se) and Pt(η3-N1N2X1)(PL) (X1 = C, S, or Se) derivatives
  125. Biosurfactants in biocorrosion and corrosion mitigation of metals: An overview
  126. Stimulus-responsive MOF–hydrogel composites: Classification, preparation, characterization, and their advancement in medical treatments
  127. Electrochemical dissolution of titanium under alternating current polarization to obtain its dioxide
  128. Special Issue on Recent Trends in Green Chemistry
  129. Phytochemical screening and antioxidant activity of Vitex agnus-castus L.
  130. Phytochemical study, antioxidant activity, and dermoprotective activity of Chenopodium ambrosioides (L.)
  131. Exploitation of mangliculous marine fungi, Amarenographium solium, for the green synthesis of silver nanoparticles and their activity against multiple drug-resistant bacteria
  132. Study of the phytotoxicity of margines on Pistia stratiotes L.
  133. Special Issue on Advanced Nanomaterials for Energy, Environmental and Biological Applications - Part III
  134. Impact of biogenic zinc oxide nanoparticles on growth, development, and antioxidant system of high protein content crop (Lablab purpureus L.) sweet
  135. Green synthesis, characterization, and application of iron and molybdenum nanoparticles and their composites for enhancing the growth of Solanum lycopersicum
  136. Green synthesis of silver nanoparticles from Olea europaea L. extracted polysaccharides, characterization, and its assessment as an antimicrobial agent against multiple pathogenic microbes
  137. Photocatalytic treatment of organic dyes using metal oxides and nanocomposites: A quantitative study
  138. Antifungal, antioxidant, and photocatalytic activities of greenly synthesized iron oxide nanoparticles
  139. Special Issue on Phytochemical and Pharmacological Scrutinization of Medicinal Plants
  140. Hepatoprotective effects of safranal on acetaminophen-induced hepatotoxicity in rats
  141. Chemical composition and biological properties of Thymus capitatus plants from Algerian high plains: A comparative and analytical study
  142. Chemical composition and bioactivities of the methanol root extracts of Saussurea costus
  143. In vivo protective effects of vitamin C against cyto-genotoxicity induced by Dysphania ambrosioides aqueous extract
  144. Insights about the deleterious impact of a carbamate pesticide on some metabolic immune and antioxidant functions and a focus on the protective ability of a Saharan shrub and its anti-edematous property
  145. A comprehensive review uncovering the anticancerous potential of genkwanin (plant-derived compound) in several human carcinomas
  146. A study to investigate the anticancer potential of carvacrol via targeting Notch signaling in breast cancer
  147. Assessment of anti-diabetic properties of Ziziphus oenopolia (L.) wild edible fruit extract: In vitro and in silico investigations through molecular docking analysis
  148. Optimization of polyphenol extraction, phenolic profile by LC-ESI-MS/MS, antioxidant, anti-enzymatic, and cytotoxic activities of Physalis acutifolia
  149. Phytochemical screening, antioxidant properties, and photo-protective activities of Salvia balansae de Noé ex Coss
  150. Antihyperglycemic, antiglycation, anti-hypercholesteremic, and toxicity evaluation with gas chromatography mass spectrometry profiling for Aloe armatissima leaves
  151. Phyto-fabrication and characterization of gold nanoparticles by using Timur (Zanthoxylum armatum DC) and their effect on wound healing
  152. Does Erodium trifolium (Cav.) Guitt exhibit medicinal properties? Response elements from phytochemical profiling, enzyme-inhibiting, and antioxidant and antimicrobial activities
  153. Integrative in silico evaluation of the antiviral potential of terpenoids and its metal complexes derived from Homalomena aromatica based on main protease of SARS-CoV-2
  154. 6-Methoxyflavone improves anxiety, depression, and memory by increasing monoamines in mice brain: HPLC analysis and in silico studies
  155. Simultaneous extraction and quantification of hydrophilic and lipophilic antioxidants in Solanum lycopersicum L. varieties marketed in Saudi Arabia
  156. Biological evaluation of CH3OH and C2H5OH of Berberis vulgaris for in vivo antileishmanial potential against Leishmania tropica in murine models
https://doi.org/10.1515/chem-2024-0118
Keywords for this article
ethanol steam reforming; nanocomposite spinel + perovskite supports + Ni + Ru; one-pot synthesis with the Pluronic P123 copolymer; surface sites; FTIRS of adsorbed CO
Creative Commons
BY 4.0

Articles in the same Issue

  1. Regular Articles
  2. Porous silicon nanostructures: Synthesis, characterization, and their antifungal activity
  3. Biochar from de-oiled Chlorella vulgaris and its adsorption on antibiotics
  4. Phytochemicals profiling, in vitro and in vivo antidiabetic activity, and in silico studies on Ajuga iva (L.) Schreb.: A comprehensive approach
  5. Synthesis, characterization, in silico and in vitro studies of novel glycoconjugates as potential antibacterial, antifungal, and antileishmanial agents
  6. Sonochemical synthesis of gold nanoparticles mediated by potato starch: Its performance in the treatment of esophageal cancer
  7. Computational study of ADME-Tox prediction of selected phytochemicals from Punica granatum peels
  8. Phytochemical analysis, in vitro antioxidant and antifungal activities of extracts and essential oil derived from Artemisia herba-alba Asso
  9. Two triazole-based coordination polymers: Synthesis and crystal structure characterization
  10. Phytochemical and physicochemical studies of different apple varieties grown in Morocco
  11. Synthesis of multi-template molecularly imprinted polymers (MT-MIPs) for isolating ethyl para-methoxycinnamate and ethyl cinnamate from Kaempferia galanga L., extract with methacrylic acid as functional monomer
  12. Nutraceutical potential of Mesembryanthemum forsskaolii Hochst. ex Bioss.: Insights into its nutritional composition, phytochemical contents, and antioxidant activity
  13. Evaluation of influence of Butea monosperma floral extract on inflammatory biomarkers
  14. Cannabis sativa L. essential oil: Chemical composition, anti-oxidant, anti-microbial properties, and acute toxicity: In vitro, in vivo, and in silico study
  15. The effect of gamma radiation on 5-hydroxymethylfurfural conversion in water and dimethyl sulfoxide
  16. Hollow mushroom nanomaterials for potentiometric sensing of Pb2+ ions in water via the intercalation of iodide ions into the polypyrrole matrix
  17. Determination of essential oil and chemical composition of St. John’s Wort
  18. Computational design and in vitro assay of lantadene-based novel inhibitors of NS3 protease of dengue virus
  19. Anti-parasitic activity and computational studies on a novel labdane diterpene from the roots of Vachellia nilotica
  20. Microbial dynamics and dehydrogenase activity in tomato (Lycopersicon esculentum Mill.) rhizospheres: Impacts on growth and soil health across different soil types
  21. Correlation between in vitro anti-urease activity and in silico molecular modeling approach of novel imidazopyridine–oxadiazole hybrids derivatives
  22. Spatial mapping of indoor air quality in a light metro system using the geographic information system method
  23. Iron indices and hemogram in renal anemia and the improvement with Tribulus terrestris green-formulated silver nanoparticles applied on rat model
  24. Integrated track of nano-informatics coupling with the enrichment concept in developing a novel nanoparticle targeting ERK protein in Naegleria fowleri
  25. Cytotoxic and phytochemical screening of Solanum lycopersicum–Daucus carota hydro-ethanolic extract and in silico evaluation of its lycopene content as anticancer agent
  26. Protective activities of silver nanoparticles containing Panax japonicus on apoptotic, inflammatory, and oxidative alterations in isoproterenol-induced cardiotoxicity
  27. pH-based colorimetric detection of monofunctional aldehydes in liquid and gas phases
  28. Investigating the effect of resveratrol on apoptosis and regulation of gene expression of Caco-2 cells: Unravelling potential implications for colorectal cancer treatment
  29. Metformin inhibits knee osteoarthritis induced by type 2 diabetes mellitus in rats: S100A8/9 and S100A12 as players and therapeutic targets
  30. Effect of silver nanoparticles formulated by Silybum marianum on menopausal urinary incontinence in ovariectomized rats
  31. Synthesis of new analogs of N-substituted(benzoylamino)-1,2,3,6-tetrahydropyridines
  32. Response of yield and quality of Japonica rice to different gradients of moisture deficit at grain-filling stage in cold regions
  33. Preparation of an inclusion complex of nickel-based β-cyclodextrin: Characterization and accelerating the osteoarthritis articular cartilage repair
  34. Empagliflozin-loaded nanomicelles responsive to reactive oxygen species for renal ischemia/reperfusion injury protection
  35. Preparation and pharmacodynamic evaluation of sodium aescinate solid lipid nanoparticles
  36. Assessment of potentially toxic elements and health risks of agricultural soil in Southwest Riyadh, Saudi Arabia
  37. Theoretical investigation of hydrogen-rich fuel production through ammonia decomposition
  38. Biosynthesis and screening of cobalt nanoparticles using citrus species for antimicrobial activity
  39. Investigating the interplay of genetic variations, MCP-1 polymorphism, and docking with phytochemical inhibitors for combatting dengue virus pathogenicity through in silico analysis
  40. Ultrasound induced biosynthesis of silver nanoparticles embedded into chitosan polymers: Investigation of its anti-cutaneous squamous cell carcinoma effects
  41. Copper oxide nanoparticles-mediated Heliotropium bacciferum leaf extract: Antifungal activity and molecular docking assays against strawberry pathogens
  42. Sprouted wheat flour for improving physical, chemical, rheological, microbial load, and quality properties of fino bread
  43. Comparative toxicity assessment of fisetin-aided artificial intelligence-assisted drug design targeting epibulbar dermoid through phytochemicals
  44. Acute toxicity and anti-inflammatory activity of bis-thiourea derivatives
  45. Anti-diabetic activity-guided isolation of α-amylase and α-glucosidase inhibitory terpenes from Capsella bursa-pastoris Linn.
  46. GC–MS analysis of Lactobacillus plantarum YW11 metabolites and its computational analysis on familial pulmonary fibrosis hub genes
  47. Green formulation of copper nanoparticles by Pistacia khinjuk leaf aqueous extract: Introducing a novel chemotherapeutic drug for the treatment of prostate cancer
  48. Improved photocatalytic properties of WO3 nanoparticles for Malachite green dye degradation under visible light irradiation: An effect of La doping
  49. One-pot synthesis of a network of Mn2O3–MnO2–poly(m-methylaniline) composite nanorods on a polypyrrole film presents a promising and efficient optoelectronic and solar cell device
  50. Groundwater quality and health risk assessment of nitrate and fluoride in Al Qaseem area, Saudi Arabia
  51. A comparative study of the antifungal efficacy and phytochemical composition of date palm leaflet extracts
  52. Processing of alcohol pomelo beverage (Citrus grandis (L.) Osbeck) using saccharomyces yeast: Optimization, physicochemical quality, and sensory characteristics
  53. Specialized compounds of four Cameroonian spices: Isolation, characterization, and in silico evaluation as prospective SARS-CoV-2 inhibitors
  54. Identification of a novel drug target in Porphyromonas gingivalis by a computational genome analysis approach
  55. Physico-chemical properties and durability of a fly-ash-based geopolymer
  56. FMS-like tyrosine kinase 3 inhibitory potentials of some phytochemicals from anti-leukemic plants using computational chemical methodologies
  57. Wild Thymus zygis L. ssp. gracilis and Eucalyptus camaldulensis Dehnh.: Chemical composition, antioxidant and antibacterial activities of essential oils
  58. 3D-QSAR, molecular docking, ADMET, simulation dynamic, and retrosynthesis studies on new styrylquinolines derivatives against breast cancer
  59. Deciphering the influenza neuraminidase inhibitory potential of naturally occurring biflavonoids: An in silico approach
  60. Determination of heavy elements in agricultural regions, Saudi Arabia
  61. Synthesis and characterization of antioxidant-enriched Moringa oil-based edible oleogel
  62. Ameliorative effects of thistle and thyme honeys on cyclophosphamide-induced toxicity in mice
  63. Study of phytochemical compound and antipyretic activity of Chenopodium ambrosioides L. fractions
  64. Investigating the adsorption mechanism of zinc chloride-modified porous carbon for sulfadiazine removal from water
  65. Performance repair of building materials using alumina and silica composite nanomaterials with electrodynamic properties
  66. Effects of nanoparticles on the activity and resistance genes of anaerobic digestion enzymes in livestock and poultry manure containing the antibiotic tetracycline
  67. Effect of copper nanoparticles green-synthesized using Ocimum basilicum against Pseudomonas aeruginosa in mice lung infection model
  68. Cardioprotective effects of nanoparticles green formulated by Spinacia oleracea extract on isoproterenol-induced myocardial infarction in mice by the determination of PPAR-γ/NF-κB pathway
  69. Anti-OTC antibody-conjugated fluorescent magnetic/silica and fluorescent hybrid silica nanoparticles for oxytetracycline detection
  70. Curcumin conjugated zinc nanoparticles for the treatment of myocardial infarction
  71. Identification and in silico screening of natural phloroglucinols as potential PI3Kα inhibitors: A computational approach for drug discovery
  72. Exploring the phytochemical profile and antioxidant evaluation: Molecular docking and ADMET analysis of main compounds from three Solanum species in Saudi Arabia
  73. Unveiling the molecular composition and biological properties of essential oil derived from the leaves of wild Mentha aquatica L.: A comprehensive in vitro and in silico exploration
  74. Analysis of bioactive compounds present in Boerhavia elegans seeds by GC-MS
  75. Homology modeling and molecular docking study of corticotrophin-releasing hormone: An approach to treat stress-related diseases
  76. LncRNA MIR17HG alleviates heart failure via targeting MIR17HG/miR-153-3p/SIRT1 axis in in vitro model
  77. Development and validation of a stability indicating UPLC-DAD method coupled with MS-TQD for ramipril and thymoquinone in bioactive SNEDDS with in silico toxicity analysis of ramipril degradation products
  78. Biosynthesis of Ag/Cu nanocomposite mediated by Curcuma longa: Evaluation of its antibacterial properties against oral pathogens
  79. Development of AMBER-compliant transferable force field parameters for polytetrafluoroethylene
  80. Treatment of gestational diabetes by Acroptilon repens leaf aqueous extract green-formulated iron nanoparticles in rats
  81. Development and characterization of new ecological adsorbents based on cardoon wastes: Application to brilliant green adsorption
  82. A fast, sensitive, greener, and stability-indicating HPLC method for the standardization and quantitative determination of chlorhexidine acetate in commercial products
  83. Assessment of Se, As, Cd, Cr, Hg, and Pb content status in Ankang tea plantations of China
  84. Effect of transition metal chloride (ZnCl2) on low-temperature pyrolysis of high ash bituminous coal
  85. Evaluating polyphenol and ascorbic acid contents, tannin removal ability, and physical properties during hydrolysis and convective hot-air drying of cashew apple powder
  86. Development and characterization of functional low-fat frozen dairy dessert enhanced with dried lemongrass powder
  87. Scrutinizing the effect of additive and synergistic antibiotics against carbapenem-resistant Pseudomonas aeruginosa
  88. Preparation, characterization, and determination of the therapeutic effects of copper nanoparticles green-formulated by Pistacia atlantica in diabetes-induced cardiac dysfunction in rat
  89. Antioxidant and antidiabetic potentials of methoxy-substituted Schiff bases using in vitro, in vivo, and molecular simulation approaches
  90. Anti-melanoma cancer activity and chemical profile of the essential oil of Seseli yunnanense Franch
  91. Molecular docking analysis of subtilisin-like alkaline serine protease (SLASP) and laccase with natural biopolymers
  92. Overcoming methicillin resistance by methicillin-resistant Staphylococcus aureus: Computational evaluation of napthyridine and oxadiazoles compounds for potential dual inhibition of PBP-2a and FemA proteins
  93. Exploring novel antitubercular agents: Innovative design of 2,3-diaryl-quinoxalines targeting DprE1 for effective tuberculosis treatment
  94. Drimia maritima flowers as a source of biologically potent components: Optimization of bioactive compound extractions, isolation, UPLC–ESI–MS/MS, and pharmacological properties
  95. Estimating molecular properties, drug-likeness, cardiotoxic risk, liability profile, and molecular docking study to characterize binding process of key phyto-compounds against serotonin 5-HT2A receptor
  96. Fabrication of β-cyclodextrin-based microgels for enhancing solubility of Terbinafine: An in-vitro and in-vivo toxicological evaluation
  97. Phyto-mediated synthesis of ZnO nanoparticles and their sunlight-driven photocatalytic degradation of cationic and anionic dyes
  98. Monosodium glutamate induces hypothalamic–pituitary–adrenal axis hyperactivation, glucocorticoid receptors down-regulation, and systemic inflammatory response in young male rats: Impact on miR-155 and miR-218
  99. Quality control analyses of selected honey samples from Serbia based on their mineral and flavonoid profiles, and the invertase activity
  100. Eco-friendly synthesis of silver nanoparticles using Phyllanthus niruri leaf extract: Assessment of antimicrobial activity, effectiveness on tropical neglected mosquito vector control, and biocompatibility using a fibroblast cell line model
  101. Green synthesis of silver nanoparticles containing Cichorium intybus to treat the sepsis-induced DNA damage in the liver of Wistar albino rats
  102. Quality changes of durian pulp (Durio ziberhinus Murr.) in cold storage
  103. Study on recrystallization process of nitroguanidine by directly adding cold water to control temperature
  104. Determination of heavy metals and health risk assessment in drinking water in Bukayriyah City, Saudi Arabia
  105. Larvicidal properties of essential oils of three Artemisia species against the chemically insecticide-resistant Nile fever vector Culex pipiens (L.) (Diptera: Culicidae): In vitro and in silico studies
  106. Design, synthesis, characterization, and theoretical calculations, along with in silico and in vitro antimicrobial proprieties of new isoxazole-amide conjugates
  107. The impact of drying and extraction methods on total lipid, fatty acid profile, and cytotoxicity of Tenebrio molitor larvae
  108. A zinc oxide–tin oxide–nerolidol hybrid nanomaterial: Efficacy against esophageal squamous cell carcinoma
  109. Research on technological process for production of muskmelon juice (Cucumis melo L.)
  110. Physicochemical components, antioxidant activity, and predictive models for quality of soursop tea (Annona muricata L.) during heat pump drying
  111. Characterization and application of Fe1−xCoxFe2O4 nanoparticles in Direct Red 79 adsorption
  112. Torilis arvensis ethanolic extract: Phytochemical analysis, antifungal efficacy, and cytotoxicity properties
  113. Magnetite–poly-1H pyrrole dendritic nanocomposite seeded on poly-1H pyrrole: A promising photocathode for green hydrogen generation from sanitation water without using external sacrificing agent
  114. HPLC and GC–MS analyses of phytochemical compounds in Haloxylon salicornicum extract: Antibacterial and antifungal activity assessment of phytopathogens
  115. Efficient and stable to coking catalysts of ethanol steam reforming comprised of Ni + Ru loaded on MgAl2O4 + LnFe0.7Ni0.3O3 (Ln = La, Pr) nanocomposites prepared via cost-effective procedure with Pluronic P123 copolymer
  116. Nitrogen and boron co-doped carbon dots probe for selectively detecting Hg2+ in water samples and the detection mechanism
  117. Heavy metals in road dust from typical old industrial areas of Wuhan: Seasonal distribution and bioaccessibility-based health risk assessment
  118. Phytochemical profiling and bioactivity evaluation of CBD- and THC-enriched Cannabis sativa extracts: In vitro and in silico investigation of antioxidant and anti-inflammatory effects
  119. Investigating dye adsorption: The role of surface-modified montmorillonite nanoclay in kinetics, isotherms, and thermodynamics
  120. Antimicrobial activity, induction of ROS generation in HepG2 liver cancer cells, and chemical composition of Pterospermum heterophyllum
  121. Study on the performance of nanoparticle-modified PVDF membrane in delaying membrane aging
  122. Impact of cholesterol in encapsulated vitamin E acetate within cocoliposomes
  123. Review Articles
  124. Structural aspects of Pt(η3-X1N1X2)(PL) (X1,2 = O, C, or Se) and Pt(η3-N1N2X1)(PL) (X1 = C, S, or Se) derivatives
  125. Biosurfactants in biocorrosion and corrosion mitigation of metals: An overview
  126. Stimulus-responsive MOF–hydrogel composites: Classification, preparation, characterization, and their advancement in medical treatments
  127. Electrochemical dissolution of titanium under alternating current polarization to obtain its dioxide
  128. Special Issue on Recent Trends in Green Chemistry
  129. Phytochemical screening and antioxidant activity of Vitex agnus-castus L.
  130. Phytochemical study, antioxidant activity, and dermoprotective activity of Chenopodium ambrosioides (L.)
  131. Exploitation of mangliculous marine fungi, Amarenographium solium, for the green synthesis of silver nanoparticles and their activity against multiple drug-resistant bacteria
  132. Study of the phytotoxicity of margines on Pistia stratiotes L.
  133. Special Issue on Advanced Nanomaterials for Energy, Environmental and Biological Applications - Part III
  134. Impact of biogenic zinc oxide nanoparticles on growth, development, and antioxidant system of high protein content crop (Lablab purpureus L.) sweet
  135. Green synthesis, characterization, and application of iron and molybdenum nanoparticles and their composites for enhancing the growth of Solanum lycopersicum
  136. Green synthesis of silver nanoparticles from Olea europaea L. extracted polysaccharides, characterization, and its assessment as an antimicrobial agent against multiple pathogenic microbes
  137. Photocatalytic treatment of organic dyes using metal oxides and nanocomposites: A quantitative study
  138. Antifungal, antioxidant, and photocatalytic activities of greenly synthesized iron oxide nanoparticles
  139. Special Issue on Phytochemical and Pharmacological Scrutinization of Medicinal Plants
  140. Hepatoprotective effects of safranal on acetaminophen-induced hepatotoxicity in rats
  141. Chemical composition and biological properties of Thymus capitatus plants from Algerian high plains: A comparative and analytical study
  142. Chemical composition and bioactivities of the methanol root extracts of Saussurea costus
  143. In vivo protective effects of vitamin C against cyto-genotoxicity induced by Dysphania ambrosioides aqueous extract
  144. Insights about the deleterious impact of a carbamate pesticide on some metabolic immune and antioxidant functions and a focus on the protective ability of a Saharan shrub and its anti-edematous property
  145. A comprehensive review uncovering the anticancerous potential of genkwanin (plant-derived compound) in several human carcinomas
  146. A study to investigate the anticancer potential of carvacrol via targeting Notch signaling in breast cancer
  147. Assessment of anti-diabetic properties of Ziziphus oenopolia (L.) wild edible fruit extract: In vitro and in silico investigations through molecular docking analysis
  148. Optimization of polyphenol extraction, phenolic profile by LC-ESI-MS/MS, antioxidant, anti-enzymatic, and cytotoxic activities of Physalis acutifolia
  149. Phytochemical screening, antioxidant properties, and photo-protective activities of Salvia balansae de Noé ex Coss
  150. Antihyperglycemic, antiglycation, anti-hypercholesteremic, and toxicity evaluation with gas chromatography mass spectrometry profiling for Aloe armatissima leaves
  151. Phyto-fabrication and characterization of gold nanoparticles by using Timur (Zanthoxylum armatum DC) and their effect on wound healing
  152. Does Erodium trifolium (Cav.) Guitt exhibit medicinal properties? Response elements from phytochemical profiling, enzyme-inhibiting, and antioxidant and antimicrobial activities
  153. Integrative in silico evaluation of the antiviral potential of terpenoids and its metal complexes derived from Homalomena aromatica based on main protease of SARS-CoV-2
  154. 6-Methoxyflavone improves anxiety, depression, and memory by increasing monoamines in mice brain: HPLC analysis and in silico studies
  155. Simultaneous extraction and quantification of hydrophilic and lipophilic antioxidants in Solanum lycopersicum L. varieties marketed in Saudi Arabia
  156. Biological evaluation of CH3OH and C2H5OH of Berberis vulgaris for in vivo antileishmanial potential against Leishmania tropica in murine models
Sign up now to receive a 20% welcome discount
Institutional Access
How does access work?
Have an idea on how to improve our website?
Please write us.
© 2026 De Gruyter Brill
Downloaded on 21.1.2026 from https://www.degruyterbrill.com/document/doi/10.1515/chem-2024-0118/html
Scroll to top button