物理化学学报 >> 1996, Vol. 12 >> Issue (06): 502-507.doi: 10.3866/PKU.WHXB19960605

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钙钛矿型La1+X/2Sr1-x/2Co1-xCuxO3催化CO氧化活性与表征

李绪渊,张自萍,马建泰,朱宗祯,孟益民   

  1. 兰州大学化学系，兰州 730000
  • 收稿日期:1995-10-12 修回日期:1996-01-12 发布日期:1996-06-15
  • 通讯作者: 马建泰

The Catalytic Activity for CO Oxidation and Characterization of Perovskite-type Oxides Catalysts La1+X/2Sr1-x/2Co1-xCuxO3

Li Xu-Yuan,Zhang Zi-Ping,Ma Jian-Tai,Zhu Zong-Zhen,Meng Yi-Min   

  1. Department of Chemistry,Lanzhou University,Lanzhou 730000
  • Received:1995-10-12 Revised:1996-01-12 Published:1996-06-15
  • Contact: Ma Jian-Tai

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摘要：

研究了钙钛矿型La(1+x/2)Sr(1-x/2)Co1-xCuxO3催化剂对CO氧化反应的催化活性及其表面氧的催化作用．结果表明，x＝0．4的催化剂对CO氧化具有最高催化活性，常压及本实验条件下CO完全氧化的最低温度为168℃；催化剂均为氧缺陷化合物，吸附于表面晶格氧缺陷上的吸附氧是CO氧化反应的活性氧物种；并发现催化剂中存在有非常价态的Co4+，认为CO氧化反应是通过吸附氧调变Co3+和Co4+价态而进行．

关键词: 钙钛矿型复合氧化物, CO氧化反应, 活性氧物种, 晶格氧缺陷, 催化作用

Abstract:

The catalytic activity and the reactive properties of perovskite-type oxides catalysts La(1+x/2)Sr(1-x/2)Co1-xCuxO3 for CO oxidation reaction were investigated. Results showed that the catalytic activity for CO oxidation reached to a maximum when x＝0.4. The temperature for complete CO oxidation under atmospheric and experimental conditions was 168℃. According to the stoicheometry of catalyst, all catalysts were oxygen defect compounds. The active oxygen species on this catalyst was the adsorbed oxygen which was adsorbed on the surface lattice oxygen defect. It was also found that Co4+ existed in the catalysts and the sufrace active oxygen species was caused by the Co4+. It was concluded that CO oxidation reaction on this catalyst was carried out by the valence change between Co3+ and Co4+ which was adjusted by the adsorbed oxygen.

Key words: Perovskite-type oxides, CO oxidation, Active oxygen species, Lattice oxygen defect, Catalysts