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Formaldehyde Oxidation on Pd/TiO2 Catalysts at Room Temperature: The Effects of Surface Oxygen Vacancies

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Abstract

High reduction temperature generally induces the agglomeration of supported noble metals. Howerve, we found that high temperature reduction did not induce Pd particles sintering but improved Pd dispersion. Multiple methods were further carried out to illuminate the abnormal phenomenon. The results indicated more surface oxygen defects and diffusion of Pd particles were simultaneously induced by high temperature reduction. During diffusion process of Pd particles, they were trapped by the oxygen defects because of the strong metal-support interaction, which led to improvement of Pd dispersion on the Pd/TiO2-450R catalyst. In addition, more surface oxygen vacancies on the Pd/TiO2-450R catalyst resulted in more active sites of H2O activation to form abundant surface OH groups which further enhanced adsorbed O2 activation and mobility, and then opening a more effective pathway for HCHO oxidation, which result in its high activity of Pd/TiO2-450R for ambient HCHO oxidation.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 21707136) and Natural Science Foundation of Fujian Province, China (Grant No. 2018J05027).

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Authors and Affiliations

  1. Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo, 315800, China

    Yaobin Li & Hong He

  2. Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China

    Yaobin Li, Chunying Wang & Hong He

  3. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

    Changbin Zhang & Hong He

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

    Chunying Wang, Changbin Zhang & Hong He

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  1. Yaobin Li
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Correspondence to Hong He.

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Li, Y., Wang, C., Zhang, C. et al. Formaldehyde Oxidation on Pd/TiO2 Catalysts at Room Temperature: The Effects of Surface Oxygen Vacancies. Top Catal 63, 810–816 (2020). https://doi.org/10.1007/s11244-020-01349-1

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