Abstract
Ozone-assisted catalytic oxidation of toluene was conducted over MnOx/γ-Al2O3 to identify and differentiate the role of reaction byproducts. It was found that not only alumina acted as a reservoir for toluene, but also it interacted effectively with toluene to create surface carboxylate intermediates. Surface carboxylates were essential for an effective oxidation process, and they did not directly cause catalyst deactivation. The presence of Mn sites was necessary for further oxidation of the surface carboxylates. At 90 °C, a stable catalytic activity with 95% conversion was achieved. However, at 25 °C, byproducts such as acetic acid and formic acid accumulated on the surface of the catalyst and decreased the catalyst activity.
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Acknowledgements
Authors would like to thank the University of Saskatchewan and the Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial support of this research. XANES experiments were performed at the Canadian Light Source, which is supported by the Canada Foundation for Innovation, NSERC, the University of Saskatchewan, the Government of Saskatchewan, Western Economic Diversification Canada, the National Research Council Canada, and the Canadian Institutes of Health Research.
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Aghbolaghy, M., Soltan, J. & Chen, N. Role of Surface Carboxylates in the Gas Phase Ozone-Assisted Catalytic Oxidation of Toluene. Catal Lett 147, 2421–2433 (2017). https://doi.org/10.1007/s10562-017-2143-0
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DOI: https://doi.org/10.1007/s10562-017-2143-0