物理化学学报 >> 2005, Vol. 21 >> Issue (03): 328-332.doi: 10.3866/PKU.WHXB20050321

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LaSrCo0.9B’0.1O4复合氧化物制备、氧化性能及表征

邵光新; 罗来涛; 段战辉   

  1. 南昌大学应用化学研究所,南昌　330047
  • 收稿日期:2004-07-30 修回日期:2004-10-08 发布日期:2005-03-15
  • 通讯作者: 罗来涛 E-mail:luolaitao@163.com

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 E-mail:luolaitao@163.com

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摘要： 采用聚丙烯酰胺法制备了类钙钛矿LaSrCo0.9B’0.1O4系列复合氧化物(B’= Mn、Fe、Ni、Cu)和LaSrCoO4,并考察了对CO和C3H8催化氧化反应的活性,运用XRD、BET、TEM、TPD等方法对LaSrCo0.9Ni0.1O4、LaSrCoO4进行了表征.结果表明, LaSrCo0.9Ni0.1O4和LaSrCoO4都为四方K2NiF4型纳米材料. Ni的掺入提高了LaSrCoO4的催化活性、O2的吸附量和晶格畸变率,降低了平均晶粒度.

关键词: B位掺杂, 催化氧化, 钴基复合氧化物, A2BO4

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