LaCoO_3与LaFeO_3结构与CO催化氧化性能比较研究

Comparative Studies of Structure and Catalytic Activities for CO Oxidation between LaCoO_3 and LaFeO_3

采用柠檬酸 -乙醇络合溶胶 -凝胶法合成了两个单一相钙钛矿型稀土复合氧化物 La-Co O3和 La Fe O3并对其进行了结构 ,电阻率 ,比表面积 ,表面氧特性和 CO氧化催化活性比较研究 ,结果表明 ,它们有几乎相近的大比表面积 ,但它们的晶系不同 ,La Co O3属三方晶系 ,La Fe O3属正交晶系 ,La Co O3比 La Fe O3具有高的吸附氧量和导电性及 CO低温催化氧化活性 。

Single phase perovskite type rare earth composite oxides LaCoO 3 and LaFeO 3 were prepared by sol gel method using citric acid and alcohol as complex agent.Their crystal structure, specific resistance, surface oxygen and catalytic activitises for CO oxidation were measured. The results showed that the BET surface area of the catalyst LaCoO 3 was almost the same as that of the catalyst LaFeO 3, but yet their crystal system are different, the former is trigonal system, the latter is rhombohedral system. At the same time, the catalyst LaCoO 3 showed higher adsorbed oxygen, conductivity and catalytic activities for CO oxidation than the catalyst LaFeO 3.A primary comment on their strucure and properties was presented.