Preparation and characterization of high-flux T-type zeolite membranes supported on YSZ hollow fibers

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• 作者：Xuerui Wang ; Yuanyuan Chen ; Chun Zhang ; Xuehong Gu ; Nanping Xu
• 关键词：Hollow fiber ; T-type zeolite membrane ; Pervaporation ; Stability ; Dehydration
• 刊名：Journal of Membrane Science
• 出版年：1 April, 2014
• 年：2014
• 卷：455
• 期：Complete
• 页码：294-304
• 全文大小：3916 K

文摘

T-type zeolite membranes were prepared on thin yttria-stabilized zirconia (YSZ) hollow fiber substrates by secondary growth method. Prior to membrane synthesis, the outer surface of YSZ hollow fibers were planted with T-type zeolite seeds. Extensive investigation on membrane synthesis was carried out in terms of seeding method, synthesis temperature, crystallization time and precursor composition. High-quality hollow fiber T-type zeolite membranes were synthesized at 100 掳C for 40 h using milk-like aluminosilicate gel (SiO₂:Al₂O₃:Na₂O:K₂O:H₂O=1:0.05:0.26:0.09:17 in mol) as a synthesis precursor. The as-synthesized membranes via the seeding approach of rubbing had well-intergrown zeolite layers with a thickness of ~12 渭m, which displayed high permeation flux for dehydration of organics. Typically, a water permeation flux of 7.36 kg m^鈭? h^鈭? with separation factor of >10,000 was obtained for dehydration of 90 wt% isopropanol solution at 75 掳C. The membrane synthesis via the seeding approach of vacuum-coating could produce hollow fiber T-type zeolite membranes in batch scale. High acid resistance for the membrane material was confirmed by dehydration of propanal solution with pH~4. Moreover, hollow fiber membrane modules with ca. 0.1 m² membrane area were fabricated and assembled for propanal dehydration to evaluate the technical feasibility.