超薄高性能沸石分子筛纳米片分离膜的构筑与性能研究

异丁烷系生产丁基橡胶、异聚丁烯、烷基化油、乙烯和异戊二烯等重要化工产品原料。二维材料的迅猛发展为高性能膜材料开发提供机遇和挑战。沸石纳米片材料完美结合了沸石材料的分子筛分选择性和物理厚度达到极限小的超薄特性所至使的高通量，是最理想的膜材料。面向正丁烷/异丁烷分离高选择和高通量膜研制的迫切需求，本项目拟以厚度为数个晶胞层的Silicalite-1沸石纳米片二维材料为结构单元，开展层状沸石纳米片超薄膜的设计与组装，建立构筑沸石纳米片超薄膜的新策略和方法，研究沸石纳米片的宽深比、晶胞层的数目等结构因子对纳米片超薄膜的分离性能的关联，解决膜的选择性和通量间的矛盾互逆的科学问题，制备高选择性、高通量正丁烷/异丁烷超薄分离膜，开发新一代沸石纳米片超薄膜，亦为二维材料奇异的电子、反应性能、光学等内在本质性能的研究与探索提供平台。

Isobutane is raw mateiral to production of butyl rubber, polyisobutylene, alkylate, ethylene and isoprene and other important chemical products. The rapid development of two-dimensional(2D) materials provides opportunities and challenges for the development of high performance membrane materials. Zeolite nanosheet materials perfectly combine the molecular sieving selectivity and maximum flux resulting from its ultra-thin thickness, therefore they are the most ideal membrane materials. Aiming at achieving high performance membrane for n-butane /i-butane mixture and solving the trade-off issue between the selectivity and flux, this project intends to develop new strategy and method to construct and assemble ultra-thin silicalite-1 zeolite nanosheet stacked layers as separation membrane using the few cell-unit-thin silicalite-1 zeolite nanosheets. The relevance between structure of zeolite nanosheet and separation performance of the resulting ultr-thin membrane will be studied. This work is of significance for developing a new generation of separation membrane and for providing a platform to explore the eletroinc, optical properties and reaction performance of 2D materials.