NiO-MnO_2/Al_2O_3催化臭氧化催化剂的制备及性能

Preparation and structural characterization of NiO-MnO/Al_2O_3 catalysts

采用浸渍法,以Al2O3为载体,制备了氧化镍和氧化锰复合的双组分负载型金属催化臭氧化催化剂.以松花江江水中UV254的去除率作为催化剂活性指标,通过正交试验,寻找催化剂的最佳制备工艺.实验结果表明:催化剂的最佳制备工艺为浸渍3h,活性组元体积比1:1,90℃干燥2h,400℃焙烧4h.通过扫描电镜对催化剂结构进行了表征;通过TG-DTA测试,分析了催化剂的热分解过程中反应速率、热效应和物质变化过程;运用XPS分析了催化剂表面元素的组成情况,催化剂的主要活性成分为MnO2.

Al2O3 supported NiO - MnO catalysts were prepared by absorption method, and the structures were characterized by SEM and XPS techniques. The preparation methods and conditions on catalytic activities have been studied and obtained the best reaction conditions. The results show that the catalysts of NiO - MnO/ Al2O3 have very high catalytic activities, when the hours of absorption is 3h, the mole proportion between Ni （ NO3 ） 2 and Mn （ NO3 ） 2 is 1： 1, the dried temperature at 90 ℃ for 2 h and the temperature of bake at 400 ℃ for4 h.