通过设计等级孔ZSM-5分子筛微球增强苄基化催化反应  

Boosting benzylation catalytic reaction by designing hierarchical ZSM-5 zeolite microspheres

作　　者：陈雅 郑明丹 刘湛 陈丽华[1] 王朝 CHEN Ya;ZHENG Mingdan;LIU Zhan;CHEN Lihua;WANG Zhao(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《应用化工》2025年第2期315-321,共7页Applied Chemical Industry

基　　金：国家自然科学基金(22293022);国家自然科学基金-区域创新发展联合基金(U20A20122);湖北省自然科学基金(2022CFB336)。

摘　　要：为克服MFI分子筛固有的微孔结构对客体分子的扩散限制,利用硅油的高速剪切力制备了具有等级多孔结构的ZSM-5分子筛微球。这类微球具有大的比表面积(447 m^(2)/g),表现出增强的活性位点可及性和客体分子扩散能力。在1,3,5-三甲苯与苯甲醇的苄基化反应中,等级孔ZSM-5分子筛微球对苯甲醇的转化率达到了99.35%,对目标产物的选择性为89.76%,显著优于纳米晶ZSM-5分子筛和商用微米晶ZSM-5分子筛。为制备具有高活性和高选择性的等级孔分子筛微球提供了新思路。In order to overcome the diffusion limitation of the guest molecules due to the inherent microporous structure of MFI zeolite.ZSM-5 Zeolite microspheres with hierarchical porous structure were prepared by using the high-speed shearing force of silicone oil.The ZSM-5 zeolite microsphere had a large specific surface area of 447 m^(2)/g and exhibited enhanced active site accessibility and guest molecular diffusion ability.In the benzylation reaction of 1,3,5-trimethylbenzene and benzyl alcohol,the conversion rate of benzyl alcohol reached up to 99.35%by using the ZSM-5 zeolite microsphere as the catalyst,and the selectivity of the target,2-benzyl-1,3,5-trimethylbenzene,reached 89.76%.The conversion efficiency and selectivity of the ZSM-5 zeolite microspheres with hierarchical porous structure were significantly better than those of nano ZSM-5 zeolite and commercial micron ZSM-5 zeolite.This work provides a new idea for the preparation of hierarchical pore molecular sieve microspheres with high activity and selectivity.

关 键 词：等级孔结构 ZSM-5分子筛 微球 苄基化反应 

分 类 号：TQ426.6[化学工程] O643[理学—物理化学]