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Cooperative effect between copper species and oxygen vacancy in Ce0.7−xZrxCu0.3O2 catalysts for carbon monoxide oxidation

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Abstract

The effects of Zr doping on the existence of Cu and the catalytic performance of Ce0.7−xZrxCu0.3O2 for CO oxidation were investigated. The characterization results showed that all samples have a cubic structure, and a small amount of Zr doping facilitates Cu2+ ions entering the CeO2 lattice, but excessive Zr doping leads to the formation of surface CuO crystals again. Thus, the number of oxygen vacancies caused by the Cu2+ entering the lattice (e.g., Cu2+-□-Ce4+; □: oxygen vacancy), and the amount of reducible copper species caused by CuO crystals, varies with the Zr doping. Catalytic CO oxidation tests indicated that the oxygen vacancy and the reducible copper species were the adsorption and activation sites of O2 and CO, respectively, and the cooperative effects between them accounted for the high CO oxidation activity. Thus, the samples x = 0.1 and 0.3, which possessed the most oxygen vacancy or reducible copper species, showed the best activity for CO oxidation, with full CO conversion obtained at 110 °C. The catalyst is also stable and has good resistance to water during the reaction.

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Acknowledgements

The financial support provided by the following organisations is gratefully acknowledged: the National Natural Science Foundation of China (Grant No. 21976141); the Central Committee Guides Local Science and Technology Development Special Project of Hubei Province (Grant No. 2019ZYYD073); the Outstanding Young and Middle-aged Scientific and Technological Innovation Team of the Education Department of Hubei Province (Grant No. T2020011); and the Opening Project of Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing (Grant No. STRZ2020003).

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Authors and Affiliations

  1. Institute for the Development of Energy for African Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, 1710, South Africa

    Shan Wang & Xinying Liu

  2. Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan, 430200, China

    Shan Wang, Xuelian Xu, Ping Xiao & Junjiang Zhu

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  1. Shan Wang
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  3. Ping Xiao
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Correspondence to Junjiang Zhu or Xinying Liu.

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Cooperative effect between copper species and oxygen vacancy in Ce0.7−xZrxCu0.3O2 catalysts for carbon monoxide oxidation

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Wang, S., Xu, X., Xiao, P. et al. Cooperative effect between copper species and oxygen vacancy in Ce0.7−xZrxCu0.3O2 catalysts for carbon monoxide oxidation. Front. Chem. Sci. Eng. 15, 1524–1536 (2021). https://doi.org/10.1007/s11705-021-2106-2

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