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采用聚乙二醇凝胶法合成了Co系稀土复合氧化物Nd2-xSrxCoO4±λ(0.4≤x≤1.2),以NO还原为探针反应及IR,TPD,TPR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=1.2时,样品中有少量的SrCoO3杂相。Nd2-xSrxCoO4±λ复合氧化物中Co3+含量及晶格氧均随x增大而增加,NO的还原活性与Co3+含量以及氧空位的浓度有关。
Co2 + -xSrxCoO4 ± λ (0.4≤x≤1.2) was synthesized by polyethylene glycol gel method. The catalytic activity of the catalyst was evaluated by NO reduction reaction and IR, TPD, TPR and chemical analysis Composition, structure were characterized. The results show that all the samples have K2NiF4 type structure. When x = 1.2, there is a small amount of SrCoO3 heterogeneous in the sample. The content of Co3 + and the lattice oxygen of Nd2-xSrxCoO4 ± λ complex oxide increase with the increase of x, and the reduction activity of NO is related to the concentration of Co3 + and oxygen vacancies.