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应用多晶X射线衍射法研究了ABO_3型的[(La_(1-x)Sr_x)_(1-y)□_y][Mn_(1-(?))□_(?)](O_(3-δ□_δ]系列化合物的非完整结构。结构中存在空位,Mn~((?)+)和Mn~(4+)的变价以及晶格畸变。在这个体系中对于CO完全氧化反应的催化活性是由二个相互独立的,即B位的Mn~(3+)含量和品格畸变所决定,但Mn~(3+)的量更为重要。随着Sr~(2+)含量的增加,Mn~(3+)含量下降,晶格畸变增大。因此,对这个体系引入Sr~(2+)取代La~(3+),不能起到提高催化性活的调变作用。
The crystal structure of [La_ (1-x) Sr_x) _ (1-y) __y] [Mn_ (1 -?)) __ (O_3) -δ □ _δ] series of compounds, the vacancy, Mn ~ (+) + and Mn ~ (4 +) valence and lattice distortion exist in the structure.In this system, the catalysis of CO complete oxidation reaction The activity is determined by the content and character distortion of Mn 3+, which are independent of each other, namely, B site, but the amount of Mn 3+ is more important.With the increase of Sr 2+ content, , The content of Mn ~ (3+) decreased and the crystal lattice distortion increased.Therefore, the substitution of Sr ~ (2+) for La ~ (3+) could not improve the catalytic activity.