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Preparation of high-performance zeolite T membranes by fluoride-free synthesis

Authors： LI Linzhe, LU Ying, YANG Jianhua, LU Jinming, ZHANG Yan

Units： State Key Laboratory of Fine Chemicals, Institute of Adsorption and Inorganic Membrane, Dalian University of Technology, Dalian 116024, China

KeyWords： Zeolite T membrane; Pervaporation; Isopropanol dehydration; Fluoride-free synthesis

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(5):43-50

Abstract：

Zeolite T membrane has an important application prospect in pervaporation because of its suitable framework Si/Al ratio and the effective pore size between most organic molecules and water. In this paper, dense and smooth seed layer was prepared on rough macroporous alumina support tube by the method of matching the size of seed. Then, high-performance pure phase zeolite T membrane was fabricated by fluorine-free synthesis. The effects of stirring and crystallization methods, silicon source and water silicon ratio on zeolite T membranes were investigated. The membranes prepared by fluorine-free route were used for the pervaporation test of 90 wt.% isopropanol/water solution at 348 K. The average flux was 4.21 ± 0.09 kg·m-2·h-1 with an average separation factor of more than 10000 and showed hydrothermal stability for more than 180 h. The stable flux was about 3.82 kg·m-2·h-1, and the permeate's water content remained 100%. These results showed that the process of preparing zeolite T membranes with a fluorine-free system is green and environmentally friendly, with excellent membrane-forming efficiency and excellent performance, which has great potential for industrial applications.

Funds：

国家自然科学基金（21776032）

AuthorIntro：

李璘喆（1995—），男，黑龙江省依兰县，硕士研究生，研究方向为微孔分子筛膜的制备与应用。E-mail：942722321@qq.com。

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