Abstract: A series of perovskite-like LaSrCo_0.9B’_0.1O₄ (B’=Mn、Fe、Ni、Cu) mixed oxides were synthesized by polyacrylamide gel method, and the catalytic activity for CO and C₃H₈ oxidation over these catalysts was investigated. The results show that the catalytic activity over LaSrCo_0.9Ni_0.1O₄ is the best. The 50％ and 100％ conversion temperatures of CO are 194 ℃ and 220 ℃, which are 14 ℃ and 10 ℃ lower than those over LaSrCoO₄ catalyst respectively; the 50％ and 100％ conversion temperatures of C₃H₈ are respectively 18 ℃ and 25 ℃ lower. The LaSrCo_0.9Ni_0.1O₄ and LaSrCoO₄ mixed oxides were investigated by using XRD, BET, TEM and TPD methods. The results of XRD indicate that both of the samples have tetragonal K₂NiF₄ structure, and the results of TEM suggest that they are nanostructured materials. B-site adulteration with nickel enhances the catalytic activity, the O₂-adsorption amount and the lattice distortion of LaSrCoO₄, while reduces the average crystal size on the same time.

Key words: B-site adulteration, Catalytic oxidation, Co-based mixed oxides, 　A₂BO₄