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Defect-mediated reactivity of Pt/TiO2 catalysts: the different role of titanium and oxygen vacancies

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Abstract

Defects are ubiquitous in oxide supports and can often tune the catalytic property of supported metal catalysts. This work describes the distinct role of titanium and oxygen vacancies of TiO2 supports in the catalytic performance of supported Pt catalysts for CO oxidation. Pt was loaded on the TiO2 supports with oxygen vacancies (VO-TiO2) and titanium vacancies (VTi-TiO2). It was found that different defects of TiO2 could distinctively modify the electron property of Pt and thereby CO adsorption strength. The strength of CO adsorption on Pt/VTi-TiO2 is enhanced, while that of Pt/VO-TiO2 becomes weaker. Additionally, the presence of defects would also promote the reducibility of catalysts. On the account of the superior redox ability, both Pt/VTi-TiO2 and Pt/VO-TiO2 exhibit a higher activity than Pt supported on normal TiO2 for CO oxidation.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFB0600901), the National Science Foundation of China (21525626, U1862207) and the Program of Introducing Talents of Discipline to Universities (B06006).

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Authors and Affiliations

  1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China

    Quan Xiao, Yanan Wang, Zhi-Jian Zhao, Chunlei Pei, Sai Chen, Rentao Mu & Jinlong Gong

  2. State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Lijun Gao, Rentao Mu & Qiang Fu

  3. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China

    Jinlong Gong

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  1. Quan Xiao
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  2. Yanan Wang
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  4. Chunlei Pei
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Correspondence to Jinlong Gong.

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Xiao, Q., Wang, Y., Zhao, ZJ. et al. Defect-mediated reactivity of Pt/TiO2 catalysts: the different role of titanium and oxygen vacancies. Sci. China Chem. 63, 1323–1330 (2020). https://doi.org/10.1007/s11426-020-9798-2

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  • DOI: https://doi.org/10.1007/s11426-020-9798-2

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