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为提高钙钛矿型催化剂的活性,以γ-Al2O3为载体,采用等体积浸渍法制备负载型钙钛矿LaxCe1-xTiyM1-yO3/γ-Al2O3催化剂,考察了活性组分负载量、焙烧温度、A位元素配比和B位元素掺杂对催化剂催化燃烧甲苯性能的影响,并对催化剂进行XRD和BET表征。结果表明:催化剂的最佳制备条件是活性组分负载量为12%,焙烧温度为750℃,催化剂的最佳形式为La0.8Ce0.2 Ti0.8 Mn0.2 O3/γ-Al2 O3,在该催化剂的作用下,甲苯的起燃温度T50和完全转化温度T90分别为292℃和338℃;负载型钙钛矿催化剂保持了完整的钙钛矿结构,活性组分均匀分布在载体的孔道中,虽然会导致载体的比表面积有所降低,但催化剂可以更最大程度地分散,更有利于提高催化剂的催化活性。
In order to improve the activity of perovskite-type catalyst, the supported perovskite LaxCe1-xTiyM1-yO3 / γ-Al2O3 catalyst was prepared by the same volume of impregnation method using γ-Al2O3 as support. The effects of the loading of active component, calcination temperature, A-element ratio and B-site elemental doping on the catalytic combustion of toluene were investigated. The catalysts were characterized by XRD and BET. The results show that the optimum conditions for the preparation of catalyst are as follows: the loading of active component is 12%, the calcination temperature is 750 ℃, and the best form of catalyst is La0.8Ce0.2Ti0.8Mn0.2O3 / γ-Al2O3. Under the action of this catalyst, the ignition temperature T90 and the complete conversion temperature T90 of toluene were 292 ℃ and 338 ℃, respectively. The supported perovskite catalyst retained the complete perovskite structure and the active components were uniformly distributed in the pores of the support Although the specific surface area of the carrier will be reduced, the catalyst can be more dispersed, which is more conducive to improve the catalytic activity of the catalyst.