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Formation of active oxygen species on single-atom Pt catalyst and promoted catalytic oxidation of toluene

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Abstract

Catalytic oxidation of toluene over noble metal catalysts is a representative reaction for elimination of volatile organic compounds (VOCs). However, to fully understand the activation of molecular oxygen and the role of active oxygen species generated in this reaction is still a challenging target. Herein, MgO nanosheets and single-atom Pt loaded MgO (Pt SA/MgO) nanosheets were synthesized and used as catalysts in toluene oxidation. The activation process of molecular oxygen and oxidation performance on the two catalysts were contrastively investigated. The Pt SA/MgO exhibited significantly enhanced catalytic activity compared to MgO. The oxygen vacancies can be easily generated on the Pt SA/MgO surface, which facilitate the activation of molecular oxygen and the formation of active oxygen species. Based on the experimental data and theoretical calculations, an active oxygen species promoted oxidation mechanism for toluene was proposed. In the presence of H2O, the molecular oxygen is more favorable to be dissociated to generate •OH on the oxygen vacancies of the Pt SA/MgO surface, which is the dominant active oxygen species. We anticipate that this work may shed light on further investigation of the oxidation mechanism of toluene and other VOCs over noble metal catalysts.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Nos. 51808037, 21601136 and 21876010), the Science & Technology Development Fund of Tianjin Education Commission for Higher Education (No. 2018KJ126), and the Fundamental Research Funds for the Central Universities (No. FRF-TP-16-060A1). The authors wish to thank facility support of the 1W1B and 4B9A beamline of Beijing Synchrotron Radiation Facility (BSRF).

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  1. Department of Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Shunzheng Zhao, Yanfeng Wen, Fengyu Gao, Xizhou Xie, Chengcheng Du, Honghong Yi, Dongjuan Kang & Xiaolong Tang

  2. Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China

    Shunzheng Zhao, Honghong Yi & Xiaolong Tang

  3. Center for Electron Microscopy and Tianjin Key Lab of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China

    Xijun Liu, Xianyun Pen & Fang Lü

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  1. Shunzheng Zhao
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Zhao, S., Wen, Y., Liu, X. et al. Formation of active oxygen species on single-atom Pt catalyst and promoted catalytic oxidation of toluene. Nano Res. 13, 1544–1551 (2020). https://doi.org/10.1007/s12274-020-2765-1

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