Synergistic Effect of a Carbon Black Supported PtAg Non-Alloy Bimetal Nanocatalyst for CO Preferential Oxidation in Excess Hydrogen

Authors

  • Dr. Limin Chen,

    Corresponding author
    1. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006 (P. R. China), Fax: (+86) 20-39380519
    2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (P. R. China)
    • Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006 (P. R. China), Fax: (+86) 20-39380519
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  • Prof. Ding Ma,

    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (P. R. China)
    2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P. R. China)
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  • Dr. Zhen Zhang,

    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (P. R. China)
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  • Yuanyuan Guo,

    1. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006 (P. R. China), Fax: (+86) 20-39380519
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  • Prof. Daiqi Ye,

    1. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006 (P. R. China), Fax: (+86) 20-39380519
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  • Prof. Bichun Huang

    1. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006 (P. R. China), Fax: (+86) 20-39380519
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Abstract

Carbon black (CB) supported PtAg non-alloy bimetal catalysts were prepared by incipient wetness impregnation and evaluated for CO preferential oxidation in excess H2 (PROX). PtAg/CB catalysts exhibited an evident synergistic effect. The catalyst support selection is crucial to the synergistic effect. X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning TEM energy dispersive X-ray analysis (STEM-EDX) characterization indicates no alloy was formed over the PtAg/CB catalyst after activation in H2 at 500 °C for 2 h. However, temperature-programmed reduction (TPR) and XRD data evidenced strong interactions between platinum and silver, as a result of their simultaneous reduction and high temperature activation. The Pt[BOND]Ag interactions result in high catalytic performance and the synergistic effects. This is another example of model catalyst research translating to real world catalysis. PtAg non-alloy catalysts may also be effective in eliminating or alleviating catalyst poisoning by CO-like intermediates in direct liquid fuel cells.

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