金属掺杂Ce-M(M=Fe、Ni和Cu)催化剂的CO低温氧化性能研究  

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

作　　者：李树娜[1] 石奇[1] 李小军[1] 方振华[1] 孙平[1] 周跃花[1] 张杏梅[1] 杨晓慧[1] LI Shu- na SHI Qi LI Xiao-jun FANG Zhen-hua SUN Ping ZHOU Yue-hua ZHANG Xing-mei YANG Xiao- hui(School of Chemical Engineering,Xi＇ an University,The Key Laboratory for Surface Engineering and Remanufacturing in Shaanxi Province,Xi＇ an 710065,China)

机构地区：[1]西安文理学院化学工程学院陕西省表面工程与再制造重点实验室,陕西西安710065

出　　处：《燃料化学学报》2017年第6期707-713,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21603173);陕西省自然科学基金(2016JQ2030;2016JQ5110;2016JM2015);西安市科技计划项目(CXY1531WL03;CXY1531WL22;CXY1531WL21和CXY1531WL26)资助~~

摘　　要：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N_2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CeO_2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CeO_2。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%。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 益; over CeNi catalyst, in the next, a complete CO conversion is obtained at 180 益.On the contrary, CeFe catalyst is least active and the conversion of CO is only 9 2 % at 200 ℃.

关 键 词：掺杂CeO2 FE2O3 NiO2 CUO 氧空位 CO低温氧化 

分 类 号：O643[理学—物理化学]