氧化铈气凝胶担载氧化铜催化剂的TPR研究

 采用程序升温还原研究了氧化铈气凝胶担载氧化铜催化剂的还原行为，并与其对一氧化碳氧化反应的催化活性进行了关联．发现此类催化剂中存在两种类型的氧化铜，即体相氧化铜和分散于载体表面的氧化铜，且后者中的部分氧化铜还原后易被氧化．随着此易被氧化的铜含量的增加，催化剂对一氧化碳氧化反应的催化活性升高，表明此种类型的铜为催化剂的活性组分．

TPR Study of Ceria Aerogel Supported Copper Catalyst

Ceria aerogel supported copper catalyst CuO/CeO 2 was studied by temperature programmed reduction (TPR). The influences of copper content, calcination temperature of catalyst and calcination temperature of aerogel support on the reduction behavior of CuO/CeO 2 catalyst were investigated. The results showed that two kinds of copper species exist in CuO/CeO 2 catalyst, one is bulk CuO, and the other is well dispersed CuO. The latter may be reduced in two steps, and some of it can be readily oxidized at room temperature. The catalytic activity of the catalyst increases with the increase of copper content which can be readily oxidized at room temperature, hence, it is suggested that, in CO oxidation, the active component should be the readily oxidized copper species.