Citation: Ji Jun ZHANG, Neng LI, Ying Jun LIU, Bing Xiong LIN. Doping Effect of CuO on CeO₂ for CO Oxidation[J]. Chinese Chemical Letters, ;1998, 9(9): 873-876. shu

Doping Effect of CuO on CeO₂ for CO Oxidation

Institute of Physical Chemistry Peking University Beijing 100871

Received Date: 9 March 1998

Cu-Ce-0 catalysts, prepared by the amorphous citrate precursor (ACP) method, were investigated by ICP, XRD and micro-reactor techniques. At low copper content of Cu-Ce-0 catalysts, fluorite structures formed at low calcining temperatures, and CuO doped into the CeO₂ matrix; at high copper content, in addition to the fluorite structure, crystalline monoclinic phase CuO formed as well at high calcining temperatures. There was no other phase formed even calcined at 1000℃. The results show that only a little CuO dopes into the CeO₂ matrix to form complex oxide, which promotes the catalytic activity of CO oxidation greatly. The optimum Cu-Ce-0 catalyst is composed of 15% copper by Cu/(Ce+Cu) atomic ratio, and calcined at 700℃ for 4h. The phase compositions include the crystalline CuO and the active complex oxide with fluorite structure. The formulation of the active complex oxide is Cu_0.06Ce_0.94O_1.94.
- ceria,
- copper oxide,
- fluorite-type structure, CO oxidation catalyst, doping effect
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