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Catalytic combustion of chlorobenzene over core–shell Mn/TiO2 catalysts

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Abstract

Core–shell Mn/TiO2 mixed oxide catalysts (Mn/Ti-cs) were prepared by incipient-wetness impregnation method, and tested in the catalytic combustion of chlorobenzene (CB) as a model of chlorinated aromatics. The obtained catalysts were characterized by XRD, TEM, XPS, BET, and H2-TPR. It was found that Mn/Ti-cs catalysts with different mass ratios of Mn/Ti were found to possess high activity for catalytic combustion of CB. Among these, Mn/Ti20-cs was the most active catalyst, for which the complete combustion temperature (T90) of CB was 296 °C, which was higher than the compared Mn/TiO2 nanoparticles with the same Mn/Ti mass ratio (Mn/Ti20-np). We found that the porous structure and special morphology are the main factors to increase the catalytic activity. Mn/Ti20-cs can provide more reaction and adsorption sites, surface active oxygen species than Mn/Ti20-np on the catalyst surface, which was beneficial to the diffusion and degradation of CB molecule and other intermediate products. By increasing the Mn/Ti mass ratio to 30%, T90 was raised to 400 °C. This is due to the decrease of Mn3+/Mn ratio and specific surface area. Conversion of CB over the MnTi20-cs catalyst was maintained at 90% or more for 900 min, indicating the excellent stability of this catalyst.

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Acknowledgements

We gratefully acknowledge the funding support of Science & Technology program of Wuhan Science and Technology Bureau (2015060202010121), the National Natural Science Foundation of China (No. 21471120), International Cooperation Foundation of Hubei Province (2012IHA00201), Educational Commission of Hubei Province of China (T201306) and Scientific Research Foundation of Wuhan Institute of Technology (K201515).

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Authors and Affiliations

  1. Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430074, People’s Republic of China

    Jiaqi Luo, Fei He & Shantang Liu

  2. Wuhan Industrial Institute for Chemical Advanced Material Limited Liability Company, Wuhan, 430074, People’s Republic of China

    Shantang Liu

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  1. Jiaqi Luo
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  2. Fei He
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Correspondence to Shantang Liu.

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Luo, J., He, F. & Liu, S. Catalytic combustion of chlorobenzene over core–shell Mn/TiO2 catalysts. J Porous Mater 24, 821–828 (2017). https://doi.org/10.1007/s10934-016-0321-x

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