逆CeO2/CuO催化剂用于优先氧化CO的性能

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。%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.