分子筛催化C9芳烃脱烷基的研究

Study on C_9 aromatics hydrodealkylation over zeolite catalysts

将Bi、Ni、Mo、Pt分别负载在氢型ZSM-5、MOR、Y分子筛上,以异丙苯为模型化合物对分子筛催化加氢脱烷基性能进行评价,考察了不同金属的活性和分子筛结构。结果表明,不同分子筛载体上,不同金属脱烷基活性大小次序为:Pt>Mo>Ni>Bi;分子筛的孔结构可限制产物的形成,从而影响烷基转移反应和脱烷基反应二者的活性。此外,酸强度和密度的分布与金属同样重要,它们之间的平衡协同作用对催化剂的活性有着至关重要的作用。

Loading Bi, Ni, Mo and Pt metals over H-ZSM-5, H-MOR, H-Y, performances of hydrodealkylation （HDA） of zeolites eatalysts were evaluated as cumene a model compound. Different metals HDA activity and zeolite structure were investigated. The result indicated that HDA activity of metals decreases in the order Pt 〉 Mo 〉 Ni 〉 Bi over different zeolites. Zeolite the pore structure limits the product of the formation, which direct influence on dealkylation/transalkylation activity. Furthermore, the metal and acid site density and strength distribution are both important and their proper balance is critical in determining the acidity of catalysts.