Abstract: 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 Cu₁Zr₁Ce₉O_δ.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 Cu₁Zr₁Ce₉O_δ catalyst pretreated in oxygen had the best catalytic performance. The amounts of surface lattice oxygen and Cu⁺/Cu²⁺ 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.

摘要： 将共沉淀法制备的Cu-Zr-Ce-O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H₂-TPR、CO-TPR等手段对催化剂进行了表征.结果表明，掺杂ZrO₂的Cu₁Zr₁Ce₉O_δ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Cu₁Zr₁Ce₉O_δ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.