论文部分内容阅读
以γ-Al2O3为载体,采用连续等体积浸渍法,制备了一系列不同Na含量的Na-PtSnCe/γ-Al2O3催化剂,结合XRD、Py-IR、H2-TPR和TEM等手段对催化剂进行了表征,讨论了催化剂表面酸性及负载组分与载体之间的相互作用。采用微型催化反应装置考察了碱金属Na助剂含量和焙烧温度对负载型Na-PtSnCe/γ-Al2O3催化剂的丙烷脱氢反应性能的影响。结果表明,Na-PtSnCe/γ-Al2O3催化剂丙烷脱氢性能优于PtSnCe/γ-Al2O3催化剂,最佳Na含量为0.2%;适量Na助剂的添加可以降低催化剂的表面酸,增强催化剂中活性组分与载体之间的界面作用,提高催化反应的稳定性和选择性;550℃焙烧的Na-PtSnCe/γ-Al2O3催化剂,Pt组分与各助剂及载体之间的相互作用得到增强,催化剂具有最佳反应稳定性和最高丙烯选择性。
A series of Na-PtSnCe / γ-Al2O3 catalysts with different Na content were prepared by continuous isostatic impregnation method using γ-Al2O3 as carrier. The catalysts were characterized by XRD, Py-IR, H2-TPR and TEM , Discussed the catalyst surface acidity and the interaction between the supported components and the support. The effects of alkali metal Na promoter concentration and calcination temperature on the propane dehydrogenation performance of supported Na-PtSnCe / γ-Al2O3 catalysts were investigated using a micro-catalytic reactor. The results showed that propane dehydrogenation performance of Na-PtSnCe / γ-Al2O3 catalyst was better than that of PtSnCe / γ-Al2O3 catalyst, and the optimum Na content was 0.2%. Addition of proper amount of Na promoter could decrease the surface acidity of the catalyst and enhance the activity of the catalyst The interaction between the Pt component and the support and the support were improved and the stability and selectivity of the catalytic reaction were improved. The interaction between the Pt component and each of the additives and the support was enhanced at 550 ℃ calcined Na-PtSnCe / γ-Al2O3 catalyst. The catalyst With the best reaction stability and the highest propylene selectivity.