CuO/TiO_2的制备及对NO+CO反应性能的研究

STUDIES ON PREPARATION OF CuO/TiO_2 AND CATALYTIC ACTIVITIES FOR NO+CO REACTION

以三种不同的TiO2为载体,负载6%CuO,在色谱 微反装置上考察了三种Cu6 Ti催化剂对NO+CO反应的活性。结果表明,由于制备方法不同,活性差别很大,三者活性顺序依次为:Cu6 Ti(T)>Cu6 Ti(S)>Cu6 Ti(nm),TiO2的比表面积及晶型对活性的影响不明显。H2 TPR结果表明,Cu6 Ti在整个TPR过程中出现了3或4个还原峰,表明有多种CuO物种存在。不同预处理Cu6 Ti的TPR显示,在反应中Cu物种可能以多种价态同时存在。NO TPD结果亦证明,Cu6 Ti对NO+CO的反应活性与NO在催化剂表面的解离难易密切相关,而与NO的吸附量关系不大。

The catalytic activities of CuO supported on three kinds of TiO2 were investigated with a microreactorGC NO+CO reaction system The results showed that the catalytic activity of CuO/TiO2 catalysts for NO+CO reaction decrease in the order: Cu6Ti(T)> Cu6Ti(S)>Cu6Ti(nm), and the specific surface and the crystallite transformation didn't show negative influence on catalytic activities TPR profiles indicated that Cu6Ti had three or four TPR peaks, indicating the existence of several kinds of Cu species By comparing the results of TPR and catalytic activities, it could be concluded that besides highly dispersed CuO, the CuO crystallite also plays an important role in NO+CO reaction The results of H2TPR of pretreated Cu6Ti showed that in the processing of reaction, Cu species exists in several valency Using NOTPD, we presumed that the catalytic activity has a close relationship with NO dissociation, but not with the amount of adsorbed NO