论文部分内容阅读
分子筛膜具有优良的反应和分离性能,可用于高温、高压等苛刻环境,在膜分离和膜反应等过程中的应用潜力巨大.迄今为止,已有多种分子筛膜的制备方法,包括聚合物嵌入法、原位水热晶化法和二次生长法等.与原位方法相比,二次生长法更容易操作,对晶体取向、微孔结构和膜厚等方面的控制优势明显,而且重复性也有大幅度提高.本文总结了分子筛膜的合成方法,特别着重于最具使用潜力的二次生长法,对目前存在的晶体取向、缺陷以及晶粒层数等热点问题进行了分析和论述,提出了分子筛膜制备过程中需要进一步解决的关键问题,有助于提高分子筛膜制备技术的水平.
Molecular sieve membranes have excellent reaction and separation performance, can be used in harsh environments such as high temperature and high pressure, and have great potential for application in membrane separation and membrane reaction. So far, a variety of molecular sieve membrane preparation methods have been proposed, including polymer embedding Method, in-situ hydrothermal crystallization method and secondary growth method, etc. Compared with the in-situ method, the secondary growth method is easier to operate and has obvious advantages in controlling the crystal orientation, the micropore structure and the film thickness, etc., The properties of zeolite membranes have also been greatly improved.This paper summarizes the synthesis methods of zeolite membranes, with particular emphasis on the most potential of the secondary growth method, analysis and discussion of the current hot issues such as crystal orientation, defects and grain number, The key problems to be solved in the preparation of molecular sieve membrane are put forward, which will help to improve the preparation technology of molecular sieve membrane.