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Effect of Fe/Mn Ratio on the Catalytic Oxidation of Toluene over Porous γ-Al2O3 Supported Fe and Mn Bimetal Catalysts

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Abstract

Reflux-coprecipitation method is used to synthesize porous γ-Al2O3 supported Fe and Mn bimetal catalysts, and then the as-obtained porous FexMny/Al2O3 with different Fe/Mn ratio are measured by BET, XRD, SEM, TEM, XPS, and H2-TPR. Meanwhile, effects of Fe/Mn ratio on the adsorption and catalytic oxidation properties of toluene by the as-obtained porous FexMny/Al2O3 are experimentally studied in a micro fixed-bed reactor, and then the structure–activity relationship of the porous FexMny/Al2O3 catalysts for toluene removal are obtained. Finally, the adsorption and oxidation mechanism of toluene over these porous FexMny/Al2O3 is proposed based on the in-situ FTIR analysis. Results indicate the Fe/Mn ratio has a significantly influence on the toluene oxidation activity of the porous FexMny/Al2O3 catalysts, among which porous Fe1Mn2/γ-Al2O3 exhibits the highest toluene conversion with T90 of 238 °C as well as the lowest activation energy of 32.68 kJ/mol under WHSV of 80,000 mL/g/h. However, the porous Fe1Mn2/γ-Al2O3 with different Fe/Mn ratios exhibit similar toluene adsorption capacities, and the Bangham model is well fitted with toluene adsorption over all these porous FexMny/Al2O3. In situ FTIR results reveal that adsorbed oxygen and lattice oxygen simultaneously react with the adsorbed toluene, which results in promoting the oxidation of methyl in toluene and facilitating the breakage of aromatic C = C to form CO2.

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Acknowledgements

This work was supported by Hubei Technology Innovation Special Foundation (Grant Nos. 2023AFA004, 2023BCB106, 2022BCA085, 2021BCA151 and 2022BEC004); National Foreign Experts Project (Grant No. G2023027001L) and Foundation of Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources (2021zy001). We would like to thank the Analytical and Testing Center of Wuhan University of Science and Technology for the help on XPS and TEM analysis.

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Authors and Affiliations

  1. College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan, 430081, People’s Republic of China

    Tengteng Zhang, Linbo Qin, Wei Qin & Jia Song

  2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan, 430081, People’s Republic of China

    Linbo Qin, Biao Zhou & Jun Han

  3. Hubei Provincial Industrial Safety Engineering Technology Research Center, Wuhan University of Science and Technology, Wuhan, 430081, People’s Republic of China

    Linbo Qin & Jun Han

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  1. Tengteng Zhang
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Zhang, T., Qin, L., Qin, W. et al. Effect of Fe/Mn Ratio on the Catalytic Oxidation of Toluene over Porous γ-Al2O3 Supported Fe and Mn Bimetal Catalysts. Catal Lett 154, 3357–3371 (2024). https://doi.org/10.1007/s10562-023-04566-x

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