Abstract:

The CeO₂/CuO catalysts were prepared via microemulsion or impregnation methods and characterized with X-ray diffraction（XRD），temperature-programmed reduction（TPR），surface area analysis（BET）and catalytic performance test for preferential CO oxidation. The results showed that the activity and selectivity were closely related to the size of CeO₂ and CuO particles. The CuO support of big size could enhance the selectivity of catalyst. It could provide more contact interface when small particle CeO₂ was supported on big particle CuO，and further improve the activity of catalyst.

摘要：

采用水热法合成纳米尺寸的CuO，然后采用微乳液法或浸渍法将CeO₂负载在CuO上制备逆负载的CeO₂/CuO催化剂。通过X射线衍射（XRD）、程序升温还原（TPR）、比表面分析（BET）和富氢气中CO优先氧化活性测试等研究手段对催化剂进行了表征。研究发现，CeO₂/CuO催化剂的活性和选择性与CeO₂和CuO颗粒的尺寸密切相关，大颗粒的CuO载体有利于提高催化剂的选择性；小颗粒的氧化铈负载在大颗粒的氧化铜上，可以产生更多两相接触界面，有助于提高催化剂的活性。