b轴取向MFI型分子筛膜二次生长合成策略及其应用

Strategies for the Synthesis of b-Oriented MFI Zeolite Membranes and Their Applications

b轴取向MFI型分子筛膜因其在膜分离、膜催化反应器研究领域的重要应用引起了广泛关注。本文综述了二次生长法合成b轴MFI型分子筛膜的最新研究进展,从晶种的合成、晶种涂覆方式以及二次生长溶液的组成等方面详细总结了调控b取向MFI型分子筛膜合成的方法;比较了不同分子筛膜合成策略的优缺点,及这些合成策略对不同体系的分离效果(分离因子与通量)和催化性能的影响。本文还介绍了近年来二维(2D)分子筛和分子筛纳米片的监测与生长控制方法,自下而上直接合成纳米片与高通量、高选择性分子筛膜合成方面的最新突破。通过深入探讨各种分子筛膜制备策略,对b轴取向分子筛膜制备的发展趋势进行了展望。

Due to their great potential in membrane separation and catalytic membrane reactors,considerable research effort has been applied to the b-oriented MFI zeolite membrane. The latest developments of secondary growth strategies of b-oriented MFI zeolite membrane are reviewed in this paper. In particular,the effects of important factors on preparing b-oriented MFI films,such as synthesis of seeds,seed-coating methods and synthetic solution compositions,are summarized in detail. The advantages and disadvantages of these synthetic strategies,and their influences on the separation performance（ separation factor and permeance） and catalytic performance of synthesized MFI zeolite membranes are evaluated. This review also introduces the latest breakthroughs in monitoring and controlling growth of two-dimensional（ 2D） zeolite crystal,and bottom-up syntheses of membranes with ultra high selectivity and flux from zeolite nanosheets produced in situ. Based on the extensive discussion of various preparation strategies,the developing trends in the preparation of b-oriented MFI zeolite membrane are forecasted.