逆уCeO2/CuχCo1-χOδ催化剂的制备 及其CO催化氧化性能

Preparation of Inverse уCeO2/CuχCo1-χOδ Catalysts and Their Catalytic Activities for CO Oxidation

摘要:

采用共沉淀法-浸渍相结合的制备方法，通过XRD、BET、H2 -TPR、XPS研究了CuO 与 Co3O4 质量比（mCuO:mCo3O4）、表面CeO2负载量对逆负载 уCeO2/CuχCo1-χOδ催化剂催化氧化性能的影响。结果表明：15% CeO2/Cu0.2Co0.8Oδ 催化剂性能最佳: 由于15% CeO2/Cu0.2Co0.8Oδ 比表面积较大，两相界面较多，进而使得CeO2与Cu-Co-O固溶体相互作用较强，表面存在较多的氧空穴、Cu 和Co3 ，催化剂还原温度较低，催化活性较好。常压下，当反应温度为75℃时，CO转化率可达100% 。

Abstract:

A series of inverse уCeO2/CuχCo1-χOδ catalysts were prepared by combinations of co-precipitation method and impregnation method. The influences of the mass ratio of CuO∶Co3O4 and CeO2 loading on the catalytic performance in CO oxidation were investigated using XRD, BET, H2-TPR and XPS techniques. The results revealed that 15%CeO2/Cu0.2Co0.8Oδ catalyst demonstrated the best catalytic performance. It was mainly due to the large specific surface area of 15%CeO2/Cu0.2Co0.8Oδ, more interface, which led to a strong interaction between CeO2 and Cu-Co-O, the more oxygen vacancy, Cu and Co3 on the surface. The reduction temperature decrease of 15%CeO2/Cu0.2Co0.8Oδ enhanced the catalytic activity. Thus, 15% CeO2/Cu0.2Co0.8Oδ catalyst exhibited a higher catalytic activity in the carbon monoxide oxidation with 100% CO conversion at the temperature as low as 75℃ under atmospheric pressure．