CHA分子筛膜的研究进展

CHA分子筛膜由于具有较高的酸稳定性和较好的孔道结构而受到人们的青睐。其合成方法主要有液相沉积法、气相转移法、微波合成法、二次生长法、两步变温晶化法等。有结构导向剂(SDA)合成、无结构导向剂合成是CHA分子筛膜合成的两个手段,其中无结构导向剂合成一般使用Sr²⁺、Cs⁺、F^-、K⁺等代替SDA,使得反应时间更短、对环境更加友好,是CHA分子筛膜未来的发展方向。本文主要论述了无结构导向剂合成机理,也介绍了有结构导向剂合成CHA分子筛膜,同时对CHA分子筛膜的通量、选择性、稳定性等性能进行了评述,探讨了CHA分子筛膜的应用和研究现状,并展望了CHA分子筛膜未来的研究方向。

Research Progress of CHA Molecular Sieve Membrane

CHA molecular sieve membranes have been favored by people because of their higher acid stability and better pore structure. The main systhesis methods include the liquid phase deposition, the vapor phase transfer, the microwave synthesis, the secondary growth, and the two-step variable temperature crystallization. Based on the synthesis mechanism, preparation of CHA membrane has there two means: synthesis gel containing structure directing agent (SDA) and SDA-free. The synthesis trend of SDA-free is the future development direction of CHA molecular sieve membranes due to shorter reaction time and better environmental benefits, which is generally to use Sr²⁺, Cs⁺, F^- or K⁺ instead of SDA to prepare CHA molecular sieve membranes. This article mainly discusses its synthesis mechanism. Synthetic CHA membranes with SDA are also introduced. At the same time, the flux, selectivity and stability of CHA molecular sieve membranes are reviewed. The application and research status of CHA molecular are discussed, and the future research development of CHA membrane has prospected.