物理化学学报 >> 1999, Vol. 15 >> Issue (01): 15-21.doi: 10.3866/PKU.WHXB19990104

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CO催化氧化中氧化铜对CeO2的调变作用

张继军, 刘英骏, 李能, 林炳雄   

  1. 北京大学物理化学研究所，北京 100871
  • 收稿日期:1998-03-16 修回日期:1998-06-04 发布日期:1999-01-15
  • 通讯作者: 刘英骏

Synergistic Effect between CuO and CeO2 for CO Oxidation

Zhang Ji-Jun, Liu Ying-Jun, Li Neng, Lin Bing-Xiong   

  1. Institute of Physical Chemistry,Peking University,Beijing 100871
  • Received:1998-03-16 Revised:1998-06-04 Published:1999-01-15
  • Contact: Liu Ying-Jun;

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摘要：

采用柠檬酸络合法制备并应用XRD、ICP和微反活性等方法研究了Cu－Ce－O催化剂体系，当体系中铜含量较少，焙烧温度较低时，以萤石矿型结构存在，CuO掺杂进入CeO2的晶格中；当铜含量较多，焙烧温度较高时，除了以萤石矿型结构存在外，还伴随有单斜晶系CuO的生成，焙烧温度高达1000℃时，体系无其它结构型式的晶相形成，研究发现少量的CuO使体系催化氧化CO的活性大大提高；只有极少量的CuO进入CeO2的晶格内部，该催化剂最佳配方是Cu／（Cu＋Ce）原子百分比为15％，700℃焙烧4h，其中起高催化氧化作用的是由CuO掺杂调变而成的萤石矿型复合氧化物，其组成为Cu0.06Ce0.94O1.94.

关键词: 氧化铈, 氧化铜, 萤石矿型复合氧化物, CO氧化, XRD, 调变作用

Abstract:

 A series of Cu-Ce-O catalysts, prepared by amorphous citric processor, have been investigated by XRD, ICP and micro-reaction techniques. The results showed that for low copper content Cu-Ce-O catalysts, fluorite structure formed at low calcining temperature, CuO doped into the CeO2 matrix; for high copper content, in addition to fluorite structure, crystalline monoclinic phase CuO formed as well at high calcining temperature. No other crystalline phase formed even calcined at temperatures as high as 1000 ℃.The catalytic activity of CO oxidation was greatly promoted for the synergistic effect between copper oxide and ceria. The optimum catalyst is that calcined at 700 ℃ for 4h with the relative composition of 15% of Cu/(Cu+Ce) (atomic ratio),while the formulation of the active complex oxide with fluorite structure is Cu0.06Ce0.94O1.94.

Key words: Ceria, Copper oxide, Fluorite complex oxide, CO oxidation, XRD, Synergistic effect