摘要
研究了Ｂ位二元复合钙钛石型氧化物ＬａＦｅｙＭｎ１－ｙＯ３对氨氧化反应的催化性能，用多种手段对催化剂进行了表征．讨论了氨氧化反应中ＮＯ选择性与催化剂固物圳化学性质之间的关系．发现催化剂的品体结构和过渡金属离子的氧化还原性质是影响催化剂物化性质和催化性能的重要困素．Ｂ位少量掺杂对ＮＯ选择性的影响是显著的．富锰区ＮＯ选择性主要取决于Ｍｎ４＋离子的浓度，富铁区则主要与Ｆｅ离子的状态和催化剂的缺陷结构有关．
he catalytic performance of perovskite-type oxides LaFeyMn1-yO3 (y=0￣1) for ammonia oxidation was investigated and their physicochemical properties were characterized by various methods. The relations between NO selectivity and the physico-chemical properties were discussed. It was found that the main factors affecting the catalytic performance were the crystal structure and the redox capability of the transition metal ions involved. The NO selectivity over Mn-rich catalysts mainly depends on the Mn4+ concentration. But over Fe-rich catalysts,it depends on the state of Fe ions and the defect structure of the catalysts.
基金
国家自然科学基金
关键词
钙钛石型
氧化物
氨
氧化
化学性质
perovskite-type oxide,ammonia oxidation, solid state chemical property, catalytic performance
