介孔MnOx-CeO2/γ-Al2O3催化CO低温氧化反应

摘要

采用沉积沉淀法制备一系列介孔MnOx -CeO2/γ-Al2O3催化剂,并进行X射线衍射、H2程序升温还原表征.考察锰铈摩尔比、锰铈复合氧化物负载量、煅烧温度对CO转化率的影响.实验结果表明,当锰铈元素摩尔比为7 : 3,锰铈复合氧化物负载量为9%,催化剂煅烧温度450 ℃时,催化氧化CO效果最好;在160 ℃时CO的转化率达到94%,在180 ℃时CO可完全氧化.%A series of mesoporous MnOx -CeO2/ γ -Al2 O3 catalysts were prepared by deposition -precipitation method and characterized by XRD and H2 -TPR. The effects of different manganese- cerium molar ratios,differ-ent manganese -cerium composite oxide loading,and different calcination temperatures on CO oxidation were in-vestigated. The results show that when n(Mn): n(Ce)= 7 : 3, the mass fraction of manganese-cerium com-posite oxide is 9% and the calcination temperature is 450℃,the CO effect is best for catalytic oxidation. The con-version rate of CO at 160 ℃ is up to 94%,and at 180 ℃ CO can be completely oxidized.