Xiao-Bo CHEN1,Zhiyuan An Liu Yibin3, Yang Chaohe4
摘要： ZSM-5 zeolites with a SiO2/Al2O3 ratio of 40 were synthesized by a hydrothermal method, and treated by 0.3 M tetrapropyl ammonium hydroxide (TPAOH) and 0.3 M sodium hydroxide (NaOH) separately to create hollow structures. The synthesized ZSM-5 zeolite and treated ZSM-5 zeolites were evaluated for aromatization of 1-hexene in a continuous flow reactor. The prepared ZSM-5 zeolites were characterized by XRD, SEM, TEM, NMR, XPS and other analyses. The results showed that the alkali treatment formed mesopores and hollow structures in the ZSM-5 crystals without destroying the topological structure. The acid amount of ZSM-5 zeolite was also increased after alkali treatment. Compared with the ZSM-5 zeolite treated by TPAOH, the ZSM-5 zeolite treated by NaOH had more mesopores and a higher total acid amount but a lower strong acid amount, resulting in higher aromatics yields and catalytic stability in 1-hexene aromatization. The characterization of spent ZSM-5 zeolites suggested that the spent treated ZSM-5 zeolites contained less coke, leading to a smaller reduction of micropore surface area and volume than in the spent parent ZSM-5, which contributed to the stability enhancement.