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 ,初步解释了它们的结构与性能的关系 Two single-phase perovskite rare earth oxides La-Co O3 and La Fe O3 were synthesized by citric acid-ethanol complex sol-gel method and their structures, resistivities, specific surface area, surface oxygen properties And CO oxidation catalytic activity, the results show that they have almost the same large surface area, but their different crystal system, La Co O3 is a trigonal system, La Fe O3 is an orthorhombic system, La Co O3 than La Fe O3 has a high adsorption of oxygen and conductivity and CO catalytic activity of low temperature oxidation, initially explained the relationship between their structure and performance