Hollow fiber supported CHA zeolite membranes with different Si/Al ratios in the framework were successfully synthesized by changing precursor compositions. The influence of precursor composition on the membrane composition, microstructure evolution and dehydration performances of CHA zeolite membranes, were extensively investigated. Pervaporation (PV) results indicated that the membrane separation performances were strongly influenced by both the framework Si/Al ratio and the microstructure of the membranes. The membranes with Si/Al ratio of ca. 2.7–2.8 composed of flake-like grains showed higher flux with relatively low selectivity, while the membrane with Si/Al ratio of >2.9 composed of block-shaped crystals exhibited higher separation factor of >10000. Both hydrothermal and acid stability of the membranes were dependent on the framework Si/Al ratio of CHA zeolite membranes.

通过改变前驱体组成，成功合成了骨架中具有不同Si / Al比的中空纤维负载CHA沸石膜。广泛研究了前驱体组成对膜结构，CHA分子筛膜结构和脱水性能的影响。渗透蒸发（PV）结果表明，骨架Si / Al比例和膜的微观结构都对膜的分离性能有很大的影响。Si / Al比为约3的膜。由片状晶粒组成的2.7–2.8表现出较高的通量和相对较低的选择性，而由块状晶体组成的Si / Al比> 2.9的膜表现出较高的分离系数> 10000。