Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (03): 328-332.doi: 10.3866/PKU.WHXB20050321

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Preparation, Catalytic Oxidation Properties and Characterization of LaSrCo0.9B’0.1O4 (B’=Mn, Fe, Ni, Cu) Mixed Oxides

SHAO Guang-Xin; LUO Lai-Tao; DUAN Zhan-Hui   

  1. Institute of Applied Chemistry, Nanchang University, Nanchang 330047
  • Received:2004-07-30 Revised:2004-10-08 Published:2005-03-15
  • Contact: LUO Lai-Tao

Abstract: A series of perovskite-like LaSrCo0.9B’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 LaSrCo0.9Ni0.1O4 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 LaSrCo0.9Ni0.1O4 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