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Preparation, Characterization and Activity of CuMnCeOx/CHC Catalyst in Microwave Catalytic Combustion of Toluene

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Abstract

The modification of cordierite honeycomb (CH) carrier is conducive to improve the catalytic activity of catalyst that applying in the treatment of real VOCs waste gas. A honeycombed calcium aluminum silicate hydrate (C–A–S–H) thin layer was self-assembled successfully by alkaline corrosion with supersaturated Ca(OH)2 and contacted robustly onto the CH surface (named as CHC) by chemical bond. CuMnCeOx/CHC catalyst was prepared and applied in microwave catalytic combustion of toluene to check the catalytic activity in this work. Compared with CuMnCeOx/CH catalyst, CuMnCeOx/CHC catalyst exhibited a higher catalytic capacity and the removal rate of toluene reached 99%, which was higher than 75% of CuMnCeOx/CH catalyst under same reaction conditions of toluene initial concentration 1000 mg m−3, air flow 0.12 m3 h−1 and bed temperature 200 °C. Based on SEM, BET, XRD, XPS, UV-Raman, H2-TPR and NH3-TPD characterizations, it showed clearly that honeycombed C–A–S–H thin layer made CuMnCeOx active particles with smaller size more uniformly embedded into the pores of itself to hinder effectively the agglomeration of active particles in reaction. The valence reversible conversion of Cu+/Cu2+, Mn2+/Mn3+/Mn4+ and Ce3+/Ce4+ and total valence increase of CuMnCeOx produced abundant oxygen vacancies on the catalyst surface and simultaneously improved the transformation of surface adsorbed oxygen (Oads) to lattice oxygen (Olatt). Toluene was oxidized completely by Oads and Olatt species onto the active sites and “hot spots” under microwave irradiation that following both L–H mechanism and MvK mechanism. The research work lays down a theoretical basis for the preparation of highly effective catalyst and further application in the treatment of industrial VOCs waste gas.

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Acknowledgements

This work was supported by the innovative research team of Xi’an University of Architecture and Technology.

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Authors and Affiliations

  1. Key Laboratory of Environmental Engineering of Shaanxi Province, School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Yanta Road 13#, Xi’an, 710055, China

    Wanyi Tao, Longli Bo, Mingxin Li & Jiadong Liu

  2. Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi’an, 710055, China

    Longli Bo & Jiadong Liu

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  1. Wanyi Tao
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  2. Longli Bo
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Correspondence to Longli Bo.

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Tao, W., Bo, L., Li, M. et al. Preparation, Characterization and Activity of CuMnCeOx/CHC Catalyst in Microwave Catalytic Combustion of Toluene. Catal Lett 152, 3795–3806 (2022). https://doi.org/10.1007/s10562-022-03942-3

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  • DOI: https://doi.org/10.1007/s10562-022-03942-3

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