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分别采用多次浸渍法和过量溶液浸渍法,在不同焙烧温度下制备了LaCoO3/γ-Al2O3催化剂并对其活性进行测试,利用XRD、BET等技术对样品进行了表征。研究表明,过量溶液浸渍法制备的LaCoO3/γ-Al2O3催化剂的活性要明显优于多次浸渍法;多次浸渍法制备样品的催化活性均较低,且受焙烧温度影响较小;焙烧温度对过量溶液浸渍法制备的LaCoO3/γ-Al2O3的结构和性能影响很大,随着焙烧温度的升高,催化剂样品的比表面积逐渐减小,晶粒度变大,有烧结现象,故催化活性降低,且500℃焙烧样品对甲苯催化燃烧的T10%=300℃,T99%=400℃。
The LaCoO3 / γ-Al2O3 catalysts were prepared at different calcination temperatures and tested for their activity by multiple impregnation and excessive solution impregnation respectively. The samples were characterized by XRD, BET and other techniques. The results show that the activity of LaCoO3 / γ-Al2O3 prepared by impregnation with excess solution is obviously better than that of multiple impregnation; the catalytic activity of LaCoO3 / γ-Al2O3 prepared by multiple impregnation methods is low and the effect of calcination temperature is little; The structure and properties of LaCoO3 / γ-Al2O3 prepared by impregnation with excess solution are greatly influenced. With the increase of calcination temperature, the specific surface area of catalyst sample decreases gradually, the grain size becomes larger and sintering phenomenon occurs, so the catalytic activity decreases , And T10% = 300 ° C and T99% = 400 ° C for catalytic combustion of toluene at 500 ° C.