Startseite Degradation of o-, m-, p-cresol isomers using ozone in the presence of V2O5-supported Mn, Fe, and Ni catalysts
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Degradation of o-, m-, p-cresol isomers using ozone in the presence of V2O5-supported Mn, Fe, and Ni catalysts

  • Zamani S. Ncanana , Vinod K. Vashistha , Prabal P. Singh und Rajasekhar V.S.R. Pullabhotla ORCID logo EMAIL logo
Veröffentlicht/Copyright: 7. April 2022

Abstract

Oxidative degradation of o-, m- and p-cresols using ozone in the presence of V2O5-supported metal (Mn, Fe, Ni) catalysts was studied under ambient reaction conditions. Metal (Mn, Fe, Ni) loaded V2O5 catalysts were prepared using a wet-impregnation method, thereafter, characterized, and analyzed by use of the XRD, FT-IR, SEM-EDX, TEM, and ICP-OES. Results show the effect of the amount of a metal that was loaded on the support, particularly, how it affects the resultant catalysts’ (i) crystallite size, (ii) dispersion of an active metal over the surface of a support, and (iii) catalytic activity. Mn-loaded catalysts were found to be relatively more active for the conversion of individual cresol isomers and the activity of this catalyst was significantly enhanced at a lower Mn to V2O5 ratio (2.5 wt%). Mn(2.5 %)/V2O5 catalyst led to conversions of 66.78, 71.01 and 73.68 % with o-, m-, and p-cresols respectively within 24 h of oxidation. Oxidation products were derivatized by ethanol and a few were positively detected using GC-MS. o-Tolyl acetate and 2,5-dihydroxy toluene were detected from o-cresol, m-tolyl acetate, and 2,3-dihydroxy toluene from m-cresol and p-tolyl acetate and 3,4-dihydroxy toluene from p-cresol oxidation. Dimethyl maleate and dimethyl oxalate were detected as common products in all three isomers’ oxidation.


Article note:

A collection of invited papers based on presentations at the Virtual Conference on Chemistry and its Applications (VCCA-2021) held on-line, 9–13 August 2021.



Corresponding author: Rajasekhar V.S.R. Pullabhotla, Department of Chemistry, University of Zululand, Private Bag X1001, Kwa-Dlangezwa 3886, South Africa, Phone: + 27 35 902 6155, Fax: + 27 35 902 6568, e-mail:

Funding source: National Research Foundation

Award Identifier / Grant number: Incentive Fund Grant for Rated Researchers (103691)

Funding source: University of Zululand

Award Identifier / Grant number: Project S 451/12

Funding source: National Research Foundation

Award Identifier / Grant number: Research Developmental Grant for Rated Researchers (112145)

  1. Research funding: We acknowledge the EM Unit at the UKZN, Westville campus, for permitting us to use their electron microscopes instrument (TEM & SEM). Z.S Ncanana thanks the NRF-SaIF for financial support. V.S.R Pullabhotla further acknowledges the Research & Innovation Office, UZ for the financial support through the research project S 451/12 and the National Research Foundation (NRF, South Arica) for the much needed in the form of the Incentive Fund Grant for Rated Researchers (103691) and National Research Foundation (NRF, South Arica) for the much needed in the form of the Research Developmental Grant for Rated Researchers (112145).

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/pac-2021-1005).


Published Online: 2022-04-07
Published in Print: 2022-07-26

© 2022 IUPAC & De Gruyter. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. For more information, please visit: http://creativecommons.org/licenses/by-nc-nd/4.0/

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