Cu-Zr-Ce-O复合氧化物催化剂上CO选择性氧化性能  

Selective CO oxidation in hydrogen-rich gas over Cu-Zr-Ce-O mixed oxide catalysts

作　　者：邹汉波[1] 董新法[1] 林维明[1] 

机构地区：[1]华南理工大学化工与能源学院,广东广州510640

出　　处：《化工学报》2005年第12期2320-2325,共6页CIESC Journal

基　　金：广东省自然科学基金项目(000435);教育部博士点基金项目(20010561003);广州市科技计划项目(2001J1-C0211).~~

摘　　要：将共沉淀法制备的CuZrCeO复合氧化物催化剂应用于富氢气体中CO的选择性氧化反应,研究了ZrO2掺杂量及预处理方法对催化剂性能的影响,并通过H2TPR、COTPR等手段对催化剂进行了表征.结果表明,掺杂ZrO2的Cu1Zr1Ce9Oδ催化剂在160～200℃之间具有99%以上的CO转化率和相对较高的选择性.掺杂适量的ZrO2能够提高催化剂的热稳定性和储氧能力,促进催化剂表面吸附氧向晶格氧的转化.经氧气预处理的Cu1Zr1Ce9Oδ催化剂活性最高.催化剂上Cu+/Cu2+氧化还原离子对和表面的晶格氧含量均影响催化剂的活性,但在富氢气氛下,表面的晶格氧对催化剂的性能影响较大.The Cu-Zr-Ce-O mixed oxides with various ZrO2 contents were prepared by the co-precipitation method for selective CO oxidation and characterized by H2-TPR, CO-TPR techniques. The effects of ZrO2 loading and different pretreatments on the activity of Cu-Zr-Ce-O catalysts were studied. The results showed that higher CO conversion （〉99%） and selectivity in a wider temperature range （160-200℃） were obtained when the catalyst composition was Cu1 Zr1Ce9Oδ. The addition of an appropriate quantity of ZrO2 could improve thermal stability and oxygen storage capacity, enhance the absorbed oxygen transforming to surface lattice oxygen and facilitate the oxidation of CO simultaneously. The Cu1Zr1Ce9Oδ catalyst pretreated in oxygen had the best catalytic performance. The amounts of surface lattice oxygen and Cu ^＋/Cu^2＋ ionic pair both affected the activity of the catalysts, but in hydrogen-rich atmosphere, the influence of the content of surface lattice oxygen was greater.

关 键 词：Cu-Zr-Ce-O复合氧化物 CO选择性氧化 预处理 ZRO2 

分 类 号：O643[理学—物理化学]