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Unraveling the Change in Multiple Cu Species Present in CuO/CeO2 over the Preferential CO Oxidation Reaction

  • Feng-qiu Chen
    Feng-qiu Chen
    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
    Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Kecheng District, Quzhou 324000, China
  • Yang Xia
    Yang Xia
    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
    More by Yang Xia
  • Jia-zheng Lao
    Jia-zheng Lao
    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
  • Dang-guo Cheng*
    Dang-guo Cheng
    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
    Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Kecheng District, Quzhou 324000, China
    *Email: [email protected]. Tel.: +86 571 87953382. Fax: +86 571 87951227.
  • , and 
  • Xiao-li Zhan
    Xiao-li Zhan
    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
    Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Kecheng District, Quzhou 324000, China
    More by Xiao-li Zhan
Cite this: Ind. Eng. Chem. Res. 2021, 60, 25, 9068–9079
Publication Date (Web):June 20, 2021
https://doi.org/10.1021/acs.iecr.1c01289
Copyright © 2021 American Chemical Society
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Abstract

CuO/CeO2 with strong metal–support interaction was considered to be a highly efficient catalyst in the PROX (preferential CO oxidation) reaction. Multiple Cu species from this interaction were believed to play a key role in catalytic activity. However, due to the complex chemical properties of copper, there was still controversy about the nature of active sites in the PROX reaction. In this work, the types and proportion of Cu species (Cu–[O]x–Ce, amorphous CuOx, and aggregated CuOx) could be well-controlled since CuO was loaded on surface-modified CeO2. Their properties were studied in detail through a series of characterizations. The Cu–[O]x–Ce structure was found to be the most favorable for preferential CO oxidation. While the amorphous CuOx cluster could facilitate CO oxidation, it would greatly reduce the selectivity. The aggregated CuOx caused by excessive CuO only had activity at high temperature, resulting in an upper limit of the CuO loading amount. The proportion of these Cu species varied with the CuO loading amount, and the catalytic performance was the synergetic result of all Cu species.

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