Effect of Si/Al ratio in the framework on the pervaporation properties of hollow fiber CHA zeolite membranes

被引：34
作者：
Jiang, Ji [1 ]
Peng, Li [1 ]
Wang, Xuerui [1 ]
Qiu, Hao [1 ]
Ji, Miaomiao [1 ]
Gu, Xuehong [1 ]
机构：
[1] Nanjing Tech Univ, Coll Chem Engn, Synerget Innovat Ctr Adv Mat, State Key Lab Mat Oriented Chem Engn, 5 Xinmofan Rd, Nanjing 210009, Jiangsu, Peoples R China
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2019年 / 273卷
基金：
中国国家自然科学基金;
关键词：
CHA zeolite membrane; Si/Al ratio; Pervaporation; Microstructure evolution; Stability; FAU-TYPE ZEOLITE; CHABAZITE MEMBRANES; HIGH-PERFORMANCE; AZEOTROPIC DISTILLATION; MICROWAVE SYNTHESIS; ACID STABILITY; NAA MEMBRANES; DEHYDRATION; SEPARATION; DISSOLUTION;
D O I：
10.1016/j.micromeso.2018.07.015
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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.
引用
收藏
页码：196 / 202
页数：7
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