催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (12): 1077-1082.

• 研究论文 • 上一篇    下一篇

Ce改性的Pt/γ-Al2O3催化剂用于富氢气氛下CO选择氧化

刘焕玲1,马磊1,邵赛兵1,2,李增和2,王爱琴1,黄延强1,张涛1   

  1. 1 中国科学院大连化学物理研究所, 辽宁大连 116023; 2 北京化工大学理学院, 北京 100029
  • 收稿日期:2007-12-25 出版日期:2007-12-25 发布日期:2007-12-25

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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803

被引次数

4

摘要： 研究了Ce改性的Pt/γ-Al2O3对于富氢气氛下CO选择氧化反应的催化行为. 考察了制备条件(共沉积沉淀法、分步沉积沉淀法以及沉积沉淀温度)对催化活性的影响. 结果表明,在80 ℃时用共沉积沉淀方法制备的催化剂Pt-Ce/γ-Al2O3-CP-80对CO氧化反应表现出良好的活性和选择性, CO转化率在120 ℃时可以达到85%. 利用氢气程序升温还原和原位漫反射红外光谱对不同条件下制备的催化剂进行了表征,分析了Ce的促进作用.

关键词: 铂, 铈, 氧化铝, 共沉积沉淀法, 一氧化碳, 选择性氧化, 燃料电池

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