Acta Chimica Sinica ›› 1993, Vol. 51 ›› Issue (6): 543-549.

Original Articles

### 钙钛石型复合氧化物催化剂LaMn~yCo~1-yO~3的催化性能研究Ⅰ.在氨氧化反应中氧的形态和催化性能的关系

1. 中国科学院长春应用化学研究所
• 出版日期:1993-06-15 发布日期:1993-06-15

### A study of catalytic properties of perovskite-type oxides LaMn~yCo~1-y O~3.Ⅰ.the relationship between the type of oxygen species and the catalytic property in ammonia oxidation

LIU SHETIAN;YU ZUOLONG;YU YALI;ZHANG RUIFENG;WU YUE

• Online:1993-06-15 Published:1993-06-15

The type of O species in perovskite-type oxides LaMnyCo1-yO3(y = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) was studied by XRD, XPS and TPD. The catalytic activity in NH3 oxidation was also studied. There were 3 desorption peaks in TPD curve corresponding to 3 types of O species (a, b, b'). The desorption temps. were 293 K ?Ta ?773 K, 773 K ?Tb ?1073 K and Tb' ?1073 K, resp. The relation among the composition, structure and the catalytic property of the catlyst was correlated and could be explained with a model based on solid defect reaction and the interaction between Co and Mn ions. The adsorption strength and quantity of a O are proportional to the catalytic activity. The synergetic effect between B-site ions seems to the benefit of the NH3 oxidation reaction.

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