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Mechanism of dichloromethane disproportionation over mesoporous TiO2 under low temperature

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Abstract

Mesoporous TiO2 was synthesized via nonhydrolytic template-mediated sol-gel route. Catalytic degradation performance upon dichloromethane over as-prepared mesoporous TiO2, pure anatase and rutile were investigated respectively. Disproportionation took place over as-made mesoporous TiO2 and pure anatase under the presence of water. The mechanism of disproportionation was studied by in situ FTIR. The interaction between chloromethoxy species and bridge coordinated methylenes was the key step of disproportionation. Formate species and methoxy groups would be formed and further turned into carbon monoxide and methyl chloride. Anatase (001) played an important role for disproportionation in that water could be dissociated into surface hydroxyl groups on such structure. As a result, the consumed hydroxyl groups would be replenished. In addition, there was another competitive oxidation route governed by free hydroxyl radicals. In this route, chloromethoxy groups would be oxidized into formate species by hydroxyl radicals transfering from the surface of TiO2. The latter route would be more favorable at higher temperature.

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Acknowledgements

This work was supported by Key Program of the Chinese Academy of Sciences (No. ZDRW-ZS-2016-5-3) and National Key Research and Development Program of China (Grant No. 2017YFC0211503).

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Yuzhou Deng, Shengpan Peng, Haidi Liu, Shuangde Li & Yunfa Chen

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yuzhou Deng & Shengpan Peng

  3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China

    Haidi Liu, Shuangde Li & Yunfa Chen

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  1. Yuzhou Deng
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  2. Shengpan Peng
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Correspondence to Yunfa Chen.

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Deng, Y., Peng, S., Liu, H. et al. Mechanism of dichloromethane disproportionation over mesoporous TiO2 under low temperature. Front. Environ. Sci. Eng. 13, 21 (2019). https://doi.org/10.1007/s11783-019-1113-8

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