钙钛矿型催化活性材料结构与性能的研究--Lak-xSrxCo0.75Me0.25○3-δ体系

高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (8): 731.

钙钛矿型催化活性材料结构与性能的研究--La_k-xSr_xCo_0.75Me_0.25○_3-δ体系

黄庆^1,2, 李婉^1,2, 张婉静^1,2, 吕光烈^1,2, 林炳雄^1,2

1. 北京大学化学系;
2. 北京工业大学环化系

收稿日期:1986-05-04 出版日期:1987-08-24 发布日期:1987-08-24

Studies on the Structure and Properties of Perovskite Type Materials in Catalysis--La_k-xSr_xCo_0.75Me_0.25○_3-δSeries

Huang Qing^1,2, Li Wan^1,2, Zhang Wanjing^1,2, Lu Guanglie^1,2, Lin Bingxiong^1,2

1. Department of Chemistry, Peking University, Beijing;
2. Department of Chemistry and Environ, En
9. Beijing Polytechnic University, Beijing

Received:1986-05-04 Online:1987-08-24 Published:1987-08-24

摘要/Abstract

摘要： 用多晶X射线衍射法研究了ABO₃型的[(La_1-ySr_y)_1-z□_z][Co_0.75Me_0.25][○_3-δ□_δ]系列化合物的结构和晶格畸变。结构中A位为La³⁺、Sr²⁺和约14%的空位随机占有。不同价态的Co离子和Me⁴⁺无序地分布于B位。○位为O^2-和空位随机占有。A位Sr²⁺取代La³⁺量增加,正二价的Co逐渐变为正三价,最后出现正四价。平均晶格畸率<ε₁₁₀²>^1/2,及对CO完全氧化反应的活性迅速增大。因此平均晶格畸变率<ε₁₁₀²>^1/2可表征钙钛矿相A位的调变作用和与之相关的催化性能。

Abstract: The structure and lattice strain of a series of [(La_1-ySr_y)_1-z□_z][Co_0.75Me_0.25]○_3-δ□_δ] ABO₃type compounds have been studied by polycrystalline X-ray diffrac tome try. In this structure, La³⁺,Sr²⁺and Ca 14% vacancaies occupy Asites randomly. Co and Me ions distributed at random in the Bsites and O^2-and its vacancies in the ○ sites. While the Sr²⁺content in the Asite increases, some of the Co ions change their valence from Ⅱ to Ⅲ and finally to Ⅳ, at this time both the lattice strain <ε₁₁₀²>^1/2 and the activity for COoxidation rapidly increases. Therefore the lattice stain <ε₁₁₀²>^1/2 could be regarded as a parameter to characterize the modifying effect of Asite substitution on the catalytic properties of these compounds.

TrendMD:

黄庆, 李婉, 张婉静, 吕光烈, 林炳雄. 钙钛矿型催化活性材料结构与性能的研究--La_k-xSr_xCo_0.75Me_0.25○_3-δ体系. 高等学校化学学报, 1987, 8(8): 731.

Huang Qing, Li Wan, Zhang Wanjing, Lu Guanglie, Lin Bingxiong. Studies on the Structure and Properties of Perovskite Type Materials in Catalysis--La_k-xSr_xCo_0.75Me_0.25○_3-δSeries. Chem. J. Chinese Universities, 1987, 8(8): 731.