高湿度条件下O_3在MnO_X/γ-Al_2O_3催化剂上的分解

DECOMPOSITION OF OZONE OVER MnO_X/γ-Al_2O_3 CATALYSTS

用共沉淀法制备了一系列ＭｎＯＸ ／γ－Ａｌ２Ｏ３催化剂，并考察了它们对Ｏ３分解的催化性能．结果表明，Ｍｎ／Ａｌ摩尔比为１∶３，煅烧温度为５００℃时制得的催化剂即使在高湿度条件下，对Ｏ３也有很好的催化分解效果．ＸＲＤ，ＩＲ，ＸＰＳ等分析表明，催化剂的活性中心锰在反应前后其形态发生改变，催化剂表面有新的氧物种出现．进一步依据催化剂表面羟基对Ｏ３分解的影响，解释了Ｏ３在高湿度条件下的催化分解过程．

The catalysts MnOX /γ-Al2O3 were prepared by means of co-precipitation method and their catalytic performance for the decomposition o f ozone was investigated. The results show that at a caculation temperation of 5 00℃ and in a 1∶3 molecule ratio of Mn and Al, the ozone decomposition ratio wa s very high even under high humidity condition. At the same time the catalysts b efore and after the reaction were examined by XRD, IR and XPS techniques. The de composition of ozone results in the change of the active site on the catalyst an d the appearance of a new oxygen species. Furthermore the mechanism of those O 3 decomposition processes was discussed.