CuO/m-Ce_(0.5)Zr_(0.5)O_2催化剂和富氢条件下CO氧化性能的研究

Study of CuO/m-Ce_(0.5)Zr_(0.5)O_2 Catalysts for CO Oxidation in H_2-rich Gases

采用多元醇法合成了介孔Ce0.5Zr0.5O2(m-Ce0.5Zr0.5O2)复合氧化物,研究了m-Ce0.5Zr0.5O2和焙烧温度对Cu基催化剂富氢条件下CO氧化性能的影响,并运用XRD、TPR、TPD、比表面和孔径测定等技术对载体及催化剂进行了表征。结果表明,多元醇法合成的m-Ce0.5Zr0.5O2具有较大比表面积和均一的立方萤石结构。与CuO/Ce0.5Zr0.5O2催化剂相比,CuO/m-Ce0.5Zr0.5O2催化剂具有较好的催化活性,归因于该催化剂具有较大的比表面积和高分散的CuO。焙烧温度对CuO/m-Ce0.5Zr0.5O2催化剂的性能有较大的影响,其中以673K焙烧所制备的催化剂活性最好。

Mesoporous Ce0.5Zro.502 （m- Ce0.5Zr0.5O2 ） mixed oxides were synthesized via polyol method, to be used as supports of CuO/m - Ce0.5Zr0.5O2 catalysts. The influence of the calcination temperature on the CO oxidation in the H2 - rich gas was investi- gated. The samples were choraeterized by XRD, TPR, TPD, BET and N2 physisorption techniques. High surface area and homogeneity fluorite- structured phase of m- Ce0.5Zr0.5O2 mixed oxides were obtained. Compared to CuO/Ce0.5Zr0.5O2 catalyst, CuO/m- Ce0.5Zr0.5O2 catalyst was found to be effective catalysts for the CO oxidation, it can be explained by enlarged surface area and high disper- sion of CuO. The calcination temperature has a great effect on CO oxidation, the optimal temperature is 673K. The interfaces between metal and support were proposed as the active sites for the CO oxidation reaction.