Stability Enhancement of ZSM-5 Zeolite in Olefin Aromatization by Alkali Treatment:Comparison of Medium

作者：Chen Xiaobo,An Zhiyuan,Zhu Chao,Yan Hao,Liu Yibin,Feng Xiang,Jin Xin,Yang Chaohe

摘要：ZSM-5 zeolite samples 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)solution separately to create hollow structures.The synthesized ZSM-5 zeolite and treated ZSM-5 zeolite samples were evaluated for aromatization of 1-hexene in a continuous flow reactor.The prepared ZSM-5 zeolite samples 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 for 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.

發文機構：State Key Laboratory of Heavy Oil Processing

關鍵詞：ZSM-5posttreatmenthollowstructurestabilityenhancementAROMATIZATION

分類號： O64[理學—物理化學]