摘要
研究了LaCo0.2Fe0.8O4型钙钛矿型催化剂催化燃烧改变A位取代的程度,发现晶粒度随取代度的增加而减小,同时晶格氧的量有所增大.由于高温使晶粒度增大,晶格氧减少,而适量的晶格氧有利于催化剂活性,所以较大的取代度能够使催化剂在较高温度下保持较好活性.
Investigations on the A-site substitution degree of LaCo0.2Fe0.8O4 perovskite-type catalysts for catalytic combustion of methane have revealed a reduced crystalline size as a result of increased substitution degree, which also causes increased amount of crystal oxygen. Since the presence of certain amount of crystal oxygen is beneficial for the catalytic activity, while high temperature increases the crystalline size and reduces the amount of crystal oxygen, therefore a higher degree of A-site substitution enables the catalysts to keep high catalytic activity at high temperatures.
出处
《郑州大学学报（理学版）》
CAS
2006年第3期87-90,共4页
Journal of Zhengzhou University:Natural Science Edition
基金
河南省自然科学基金资助项目
编号0411020300
关键词
钙钛矿型催化剂
取代度
耐热性
perovskite-type catalyst
substitution degree
heat-resisting property
