钙钛矿型La_((1+x)/2)Sr_((1-x)/2)Co_(1-x)Cu_xO_3催化CO氧化活性与表征

The Catalytic Activity for CO Oxidation and Characterization of Perovskite-type Oxides Catalysts La■Sr■Co_(1-x)Cu_xO_3

研究了钙钛矿型LaSrCoCu_xO_3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C04+，认为CO氧化反应是通过吸附氧调变Co3+和Co4+价态而进行．

The catalytic astivity and the reactive properties of perovskite-type oxidescatalysts LaSrCo_(1-x).Cu_xO_3 for CO oxidation reaction were investigated. Resultsshowed 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 oxygendefect compounds. The active oxygen species on this catalyst was the adsorbed oxygenwhich 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+. Itwas concluded that CO oxidation reaction on this catalyst was carried out by the valencechange between Co3+ and Co4+ which was adjusted by the adsorbed oxygen.