稀土钙钛矿型催化剂LaBO_3对NO_x催化性能及反应机理的研究(1)——催化剂的合成工艺及催化性能

Study on Catalytic Properties and Reaction Mechanism of DeNO x Catalysts LaBO 3(1) ——Preparation and Catalytic Property of the Catalysts

本文作者采用共沉淀法和机械混合法制备了稀土钙钛矿型催化剂ＬａＢＯ３（Ｂ＝Ｔｉ，Ｖ，Ｃｒ，Ｍｎ，Ｆｅ，Ｃｏ，Ｎｉ，Ｃｕ）系列稀土钙钛矿型氧化物催化剂，并采用了差热分析（ＤＴＡ）、Ｘ－射线衍射（ＸＲＤ）等技术确定了催化剂制备工艺及条件，同时研究了催化剂对于Ｎ２Ｏ分解及还原反应的催化活性变化规律。实验结果表明，按确定的制备工艺路线可合成出立方晶系的纯钙钛矿结构；在稀土钙钛矿催化剂ＬａＢＯ３中，Ｂ位离子的ｄ电子结构决定了催化剂的催化活性。

A series of perovskite type catalysts LaBO 3 where B are the first row transition metals were prepared by coprecipitation method and ceramic method and the preparing conditions of catalysts LaBO 3 were determined and analyzed with DTA,XRD and BET measurements.Meanwhile,their catalytic activities were evaluated by the studying of N 2O decomposition and reduction.The experimental results showed that according to the defined preparing condition,the catalysts LaBO 3 with perovskite structure were formed.The catalytic activities varied in a triple peak pattern with B site ions.