CuO/TiO2的制备及对NO＋CO反应性能的研究
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摘要: 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。Abstract: The catalytic activities of CuO supported on three kinds of TiO2 were investigated with a microreactor-GC NO+CO reaction system. The results showed that the catalytic activity of CuO/TiO2 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 H2-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.
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Key words:
- CuO/TiO2 /
- NO+CO reaction /
- support preparation method
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