Abstract
A heterogeneous catalyst NaOH–NaAlO2/γ-Al2O3 was prepared by supporting NaOH and NaAlO2 on γ-Al2O3, and it was further employed for the oxidative degradation of lignin. The influence of the oxidant, the molar ratio of NaOH to NaAlO2, and calcination temperature of the supported catalyst on the catalytic activity were investigated. Air was found to be an effective oxidant for lignin conversion in the presence of heterogeneous catalyst. The total yield of monophenolic compounds (MPCs) from dealkaline lignin was 13.0 %, which was obtained by using NaOH–NaAlO2/γ-Al2O3 calcinated at 550 °C as the catalyst with 2:3 M ratio of NaOH to NaAlO2 at 170 °C for 2.5 h in air. Vanillin and syringaldehyde were found to be the main products, giving yields of 6.7 and 2.9 %, respectively. The conversion of lignin derived from wheat straw was also carried out under the identical conditions. Wheat straw lignin also displayed considerable conversion to MPCs in the presence of NaOH–NaAlO2/γ-Al2O3, and the total yield of MPCs at 12.3 % was obtained at 180 °C. NaOH–NaAlO2/γ-Al2O3 was recovered by filtration after the reaction and reused without further treatment, and 11.0 % total yield of MPCs was obtained after four cycles.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: Yijie Zhou: Investigation, Data curation, Formal analysis, Visualization, Writing-original draft. Kehui Luo: Investigation, Validation, Formal analysis. Zhenzhen Wu: Data curation, Conceptualization, Project administration. Guozhi Fan: Methodology, Conceptualization, Funding acquisition, Resource, Writing-review and editing. The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: Not applicable.
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© 2024 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Articles
- Kinetics and thermodynamics of methylene blue adsorption onto black plum seed-based graphene oxide
- Preparation of high-activity mineral powder from coal gangue through thermal and chemical activation
- Electrical performance of calcium ferrite in sintering by the assimilation melt breakover method
- Production of biodiesel from hemp oil and oleic acid with sulfonated camphor catalysts is to be evaluated with controlled tests in a diesel engine
- Removing fluorine and chlorine from zinc oxide dust by wet alkaline washing and studying fluorine occurrence states
- Epoxidation of sunflower oil via in situ generated hybrid peracids mechanism
- Oxidative conversion of lignin into monophenolic compound catalyzed by NaOH–NaAlO2/γ-Al2O3 under mild conditions
- Dynamic modeling and optimization of methanol partial oxidation to formaldehyde over Mo–Fe catalyst in an industrial isothermal reactor
- Testing of kaolinite/TiO2 nanocomposites for methylene blue removal: photodegradation and mechanism
- Investigation of gas-liquid flow hydrodynamics in the industrial-scale stirred tank with inclined impeller
Artikel in diesem Heft
- Frontmatter
- Articles
- Kinetics and thermodynamics of methylene blue adsorption onto black plum seed-based graphene oxide
- Preparation of high-activity mineral powder from coal gangue through thermal and chemical activation
- Electrical performance of calcium ferrite in sintering by the assimilation melt breakover method
- Production of biodiesel from hemp oil and oleic acid with sulfonated camphor catalysts is to be evaluated with controlled tests in a diesel engine
- Removing fluorine and chlorine from zinc oxide dust by wet alkaline washing and studying fluorine occurrence states
- Epoxidation of sunflower oil via in situ generated hybrid peracids mechanism
- Oxidative conversion of lignin into monophenolic compound catalyzed by NaOH–NaAlO2/γ-Al2O3 under mild conditions
- Dynamic modeling and optimization of methanol partial oxidation to formaldehyde over Mo–Fe catalyst in an industrial isothermal reactor
- Testing of kaolinite/TiO2 nanocomposites for methylene blue removal: photodegradation and mechanism
- Investigation of gas-liquid flow hydrodynamics in the industrial-scale stirred tank with inclined impeller