采用聚乙二醇凝胶法合成了Co系稀土复合氧化物Pr2-xSrxCoO4±λ(0.2≤x≤1.0),以CO还原NO为探针反应及XRD、IR、TPR、XPS和化学分析等方法对催化剂的组成、结构进行了表征.结果表明:所有样品都具有K2NiF4型结构,x=0.2和x=1.0时,样品中有少量杂相,0.6≤x≤1.0时,形成的复合氧化物除T相外尚有少量T*相生成;Pr2-xSrxCoO4±λ复合氧化物中Co3+的含量及非化学计量氧(λ)随x增大而增加;CO还原NO的催化活性与Co3+含量以及氧空位浓度有关. The Co-based rare earth composite oxides Pr2-xSrxCoO4 ± λ (0.2≤x≤1.0) were synthesized by polyethylene glycol gel method. The NO reduction by CO was investigated by probe reaction and XRD, IR, TPR, XPS and chemical analysis The results show that all the samples have K2NiF4 type structure. When x = 0.2 and x = 1.0, there is a small amount of heterogeneous phase in the sample, and when 0.6≤x≤1.0, the complex oxide formed There is a small amount of T * phase outside T phase; the content of Co3 + and the non-stoichiometric oxygen (λ) in Pr2-xSrxCoO4 ± λ complex oxide increase with the increase of x; the catalytic activity of CO reduction of NO and the content of Co3 + Concentration related.