Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2007, Vol. 28 ›› Issue (12): 1077-1082.

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Preferential CO Oxidation on Ce-Promoted Pt/γ-Al2O3Catalysts under H2-Rich Atmosphere

LIU Huanling1, MA Lei1*, SHAO Saibing1,2, LI Zenghe2, WANG Aiqin1, HUANG Yanqiang1, ZHANG Tao1*   

  1. 1 Dalian Institute of Chemical and Physics, The Chinese Academy of Science, Dalian 116023, Liaoning, China; 2 Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2007-12-25 Online:2007-12-25 Published:2007-12-25

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Abstract: Preferential CO oxidation (PROX) under hydrogen-rich atmosphere was investigated over Ce-promoted Pt/γ-Al2O3catalysts. The preparation procedures and conditions,including co-deposition-precipitation (CP), sequential deposition-precipitation (SP), and deposition-precipitation temperature, had great impacts on the catalytic activity. Among the catalysts investigated, the Pt-Ce/γ-Al2O3-CP-80 catalyst prepared by co-deposition-precipitation at 80 ℃ showed the best catalytic performance with the maximum CO conversion of 85% at 120 ℃. The catalysts prepared under different conditions were further characterized by temperature-programmed reduction (H2-TPR) and in situ DRIFTS, and the promoting role of Ce was clarified.

Key words: platinum, cerium, alumina, co-deposition-precipitation, carbon monoxide, preferential oxidation, fuel cell