负载型催化剂MnOx-CeO2/TiO2去除甲苯

Structured catalyst MnOx-CeO2/TiO2 for toluene removal

摘要:

为了考察铈掺杂对金属氧化物催化剂催化燃烧处理有机废气的影响,采用蜂窝状TiO2丝网作为催化燃烧催化剂的载体,以MnOx、CeO2作为活性组分,用浸渍法负载制备出催化燃烧催化剂,考察了活性组分负载量及配比、焙烧温度、焙烧时间对催化剂降解甲苯的影响.实验确定了催化剂的最佳制备工艺:Mn的负载量(质量分数)约为15%,Mn与Ce物质的量比为3∶1,催化剂的焙烧温度为500℃,焙烧时间为5h.结果表明:与催化剂MnOx/TiO2相比,掺杂Ce后的催化剂MnOx-CeO2/TiO2对甲苯催化燃烧的起燃温度和完全转化温度均有明显降低,催化剂表面燃烧物颗粒的粒径有所减小,分散均匀,更有利于甲苯的降解处理.

Abstract:

In this paper,the effect of Ce-doping of metal oxidation on the removal of volatile organic compounds was studied. The combustion catalysts MnOx /TiO2 and MnOx-CeO2 /TiO2 were prepared with MnOx and MnOx-CeO2 as active components by impregnation method on porous TiO2 films. The active group of distribution ratio and loading,calcination temperature,and calcination time were investigated on toluene removal. The preparation process of catalyst was the loading amount of Mn about 15 wt% ,and the ratio of Mn to Ce 3∶ 1 at the calcination temperature of 500 ℃ for 5 h. Experimental results show that compared with MnOx /TiO2, the ignition and complete conversion temperatures on MnOx-CeO2 /TiO2 catalyst are significantly lowered,the size of oxide particles on the surface of MnOx-CeO2 /TiO2 catalyst is reduced and they disperse evenly.