支撑沸石分子筛膜的研究进展

Study Progress in Preparation of Supported Zeolite Membranes

支撑沸石分子筛膜具有优良的择形分离与催化性能,且具有耐高温、抗化学侵蚀性强及机械强度高等特点,在膜分离和膜反应中的应用前景广阔;此类无机膜还可作为原子簇和超分子化合物的纳米组装基体,在制备具有特殊功能的光学和电化学材料等方面具有潜在的重要用途。本文综合评述了支撑分子筛膜的研究进展,阐述了支撑分子筛膜的水热合成方法(包括原位合成法和晶种法)及定向生长机理,讨论了最具开发潜力的A型和MFI型支撑沸石膜的合成条件及其与膜结构的关系,提出了需要进一步解决的问题和今后的主要研究方向。

Supported zeolite membranes combine the specific properties of zeolite molecular sieve with the high thermal stability, excellent mechanical behavior and resistance to chemical corrosion. They can work not only for gas separation, liquid pervaporation and applications in catalytic reactors, but also can be considered as very promising hosts of guest atom cluster and molecules for sensors and non-linear optical materials. This review focuses on the latest development of supported zeolite membranes. The hydrothermal synthesis methods including direct in-situ crystallization and seeding assisted crystallization were introduced, and the mechanism of orientated growth for zeolite crystal on porous support was elucidated. Especially, the effects of synthesis conditions on crystal growth and microstructure for A-type and MFI- type zeolite membranes were discussed. A number of points to need to be explored or further investigated are presented.