金属掺杂Ce-M(M=Fe、Ni和Cu)催化剂的CO低温氧化性能研究

采用水热合成法制备了一系列不同金属掺杂的Ce-M（M=Fe、Ni和Cu）复合氧化物，运用低温N₂吸附-脱附、XRD、H₂-TPR、拉曼光谱和XPS等表征技术对Ce-M复合氧化物的结构与其CO低温氧化反应性能之间的关系进行了关联。结果表明，将Fe、Ni和Cu掺入CeO₂明显提高了其氧空位的含量，提升了晶格氧的流动性，从而使Ce-M催化剂的还原能力和催化活性高于纯CeO₂。其中，CeCu催化剂氧空位最多、还原能力最好，催化活性最高，130 ℃下即可将CO完全氧化；其次是CeNi催化剂，180 ℃时实现CO完全氧化；与之相比，CeFe催化剂的活性最差，200 ℃时的CO转化率仅为92%。

Low temperature CO oxidation over the ceria oxide catalysts doped with Fe,Ni and Cu

A series of ceria oxide catalysts doped with Fe, Ni and Cu were prepared by hydrothermal method and they characterized by N₂ sorption, XRD, H₂-TPR, Raman spectra and XPS; the relationship between the structure of Ce-M mixed oxides and their catalytic performance in low temperature CO oxidation were then investigated. The results reveal that the incorporation of Fe, Ni and Cu metal ions into CeO₂ can remarkably increase the amount of oxygen vacancies in the doped samples, which is beneficial to the migration of the lattice oxygen; as a result, the doped Ce-M mixed oxides exhibit much higher reducibility and catalytic activity than the pure CeO₂. Among them, the CeCu catalyst with most oxygen vacancies exhibits the highest activity in CO oxidation, with a complete CO conversion at 130℃; over CeNi catalyst, in the next, a complete CO conversion is obtained at 180℃. On the contrary, CeFe catalyst is least active and the conversion of CO is only 92% at 200℃.