含氟体系合成分子筛膜的研究进展

分子筛膜不但具有分子筛单体独特均一的孔道结构及可调变等性质,并且具有机械强度大、热稳定性高、耐化学药剂能力强等特点,在气体分离、催化反应及溶剂提纯领域具有很好的应用前景,成为近年来研究的热点之一。在合成分子筛膜的过程中,氟离子可以代替氢氧根离子作为矿化剂,在近中性体系下合成出分子筛膜;并且,氟离子在某些合成反应中可以起到结构导向剂的作用,代替价格昂贵的有机模板剂;对于特定类型的分子筛膜,在含氟体系下合成具有更优异的性能。总结了含氟体系下合成的不同类型的分子筛膜的研究现状和最新进展,在此基础上对氟离子在分子筛膜的合成中的作用机理进行了探讨。

Progress in synthesis of zeolite membranes in fluorine media

Molecular sieve membrane has not only the unique and uniform pore structure and adjustable properties of molecular sieve monomer,but also the characteristics of high mechanical strength,high thermal stability and strong chemical resistance.It has a good application prospect in the fields of gas separation,catalytic reaction and solvent purification.It has become one of the hot spots in recent years.In the process of synthesizing molecular sieve membrane,fluorine ion can replace hydroxyl ion as mineralizer and synthesize molecular sieve membrane in near neutral system.Moreover,fluorine ion can play the role of structure guide agent in some synthesis reactions and replace expensive organic template agent.For a few specific types of zeolite membrane,the synthesis in fluorine media has better performance.The research status and the latest progress of different types of zeolite membranes synthesized in fluorine-containing system were summarized.On this basis,the mechanism of fluorine ion in the synthesis of zeolite membrane was discussed.