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采用等体积浸渍法制备了以稀散金属In、过渡金属Ag和稀土金属Ce为活性组分,以γ-Al2O3为载体的三效催化剂。通过XRD、BET、SEM、N2吸附技术对In-Ag-Ce-O/γ-Al2O3催化剂的微观结构进行了表征,并考察了In含量(质量分数)对催化剂性能的影响。结果表明,加入In之后,在XRD谱图中出现了AgInO2物相,使催化剂活性得以提高,但随着In含量的增加,催化剂的活性逐渐下降;由BET、SEM分析可知,In含量的增加,造成活性组分聚集,使其分散度降低,催化剂比表面积降低,催化活性随之下降。活性组分In含量为2%时,In-Ag-Ce-O/γ-Al2O3催化剂的三效催化活性最佳。
Equal volume impregnation method was used to prepare a three-way catalyst with rare-earth metal In, transition metal Ag and rare-earth metal Ce as active components and γ-Al2O3 as carrier. The microstructure of In-Ag-Ce-O / γ-Al2O3 catalyst was characterized by XRD, BET, SEM and N2 adsorption. The effects of In content (mass fraction) on the catalyst performance were investigated. The results show that after the addition of In, the phase of AgInO2 appears in the XRD spectrum to increase the activity of the catalyst. However, the activity of the catalyst decreases gradually with the increase of In content. The BET, SEM analysis shows that the increase of In content, Resulting in the aggregation of the active components, so that the dispersion decreased, the catalyst surface area decreased, the catalytic activity decreased. The In-Ag-Ce-O / γ-Al2O3 catalyst has the best three-way catalytic activity at an In content of 2%.