Co_3O_4/CeO_2的氧化还原性能及反应条件对其CO氧化活性的影响  

Redox property of Co_3O_4/CeO_2 and the effect of reaction conditions on its performance in CO oxidation

作　　者：邵建军[1,2] 朱锡[2] 申文杰[3] 

机构地区：[1]92493部队博士后科研工作站 [2]海军工程大学船舶与海洋工程系 [3]中国科学院大连化学物理研究所催化基础国家重点实验室

出　　处：《燃料化学学报》2012年第1期75-79,共5页Journal of Fuel Chemistry and Technology

基　　金：中国博士后科学基金(20100471808)

摘　　要：采用沉淀氧化法制备了Co3O4/CeO2催化剂。运用XRD、BET和TPR表征手段,考察了不同钴铈比及焙烧温度对钴铈复合氧化物物理及化学性能的影响,并分别在干、湿条件下进行了一氧化碳氧化反应研究。结果表明,与纯的Co3O4相比,在不同比例的Co3O4/CeO2均经723 K焙烧的各种催化剂中,钴铈原子比为9∶1的复合氧化物粒径较小,比表面积较大,说明适当比例铈的添加能使Co3O4具有较小的粒径。此氧化物经538 K温度焙烧制得的钴铈比为9∶1的复合氧化物中Co3O4平均粒径为7.2 nm,BET比表面积为167.6 m2/g。经TPR考察发现其具有最优的氧化还原性能。Co3O4/CeO2 catalysts were prepared by co-precipitation-oxidation method and characterized by using X-ray diffraction（XRD）,surface area（SBET） measurement and temperature-programmed reduction（TPR）.The effect of cobalt content in Co3O4/CeO2 on its physical properties and catalytic performance in CO oxidation was investigated under both the humid and dry conditions.The results indicated that the Co3O4/CeO2 composite with a Co/Ce atomic ratio of 9（calcined at 723 K） exhibits much smaller particle size and higher surface area than pure Co3O4;the addition of cerium to Co3O4 is beneficial to obtain Co3O4 with small particle size.The average particle size and BET surface area of Co3O4 in the Co3O4/CeO2 composite（Co/Ce atomic ratio = 9） calcined at 538 K are 7.2 nm and 167.6 m2/g,respectively.Accordingly,the Co3O4/CeO2 composite exhibits excellent redox property.

关 键 词：氧化钴 氧化铈 一氧化碳 低温 氧化 

分 类 号：O643[理学—物理化学]