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ABPO_(3-x)型催化剂的完整晶体CaMnO_3是钙钛矿型结构。在催化过程中催化剂晶体发生氧化——还原应用,晶体中首先出现缺氧空位点缺陷。当失氧量很小时(x≤0.5)晶体中的缺陷主要是缺氧空位,当失氧量很大时(x<0.5晶体就会出现线,面甚至体缺陷而部分结体,解体后的微晶仍具有较高的活性,能再氧化形成大块完整晶体。显然催化剂失去氧在失氧量很小时用点缺陷可以很好地解释,但对大量失氧晶体解体用点缺陷来解释这个还原—再氧化过程是不充分的。本文就这一问题进行了高分辨电子显微象研究。
The complete crystal CaMnO_3 of ABPO_ (3-x) is a perovskite structure. Oxidation - reduction of the catalyst crystal occurs during the catalytic process, and defects in the crystal appear firstly. When the amount of oxygen is very small (x ≤ 0.5) crystal defects mainly hypoxia vacancies, when the amount of oxygen is very large (x <0.5 crystal will appear line, surface and even body defect partial junction, disintegration Crystallite still has a high activity, re-oxidation to form a large complete crystal.Obvious catalyst loss of oxygen in a small amount of oxygen can be well explained by point defects, but a large number of oxygen-deficient crystal disintegration point defect to explain this Reduction - reoxidation process is not sufficient.This paper conducted a high-resolution electron microscopy study.