High performance ZSM-5 membranes on coarse macroporous -Al2O3 supports for dehydration of alcohols

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• 作者：Liangqing Li ; Jianhua Yang ; Jiajia Li ; Jinqu Wang ; Jinming Lu ; Dehong Yin and Yan Zhang
• 刊名：AIChE Journal
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：62
• 期：8
• 页码：2813-2824
• 全文大小：1251K
• ISSN：1547-5905

文摘

High-performance ZSM-5 membranes with a low Si/Al ratio of 10.3 were prepared on cheap coarse macroporous α-Al₂O₃ tubes by fluoride route without organic template. The effects of crystallization time and aluminum source on the growth, morphology and pervaporation (PV) performances of the as-synthesized membranes were investigated. The feasibility of preparing ZSM-5 membranes with different Si/Al ratio which was implemented by using different Al₂(SO₄)₃·18H₂O content in synthesis gel were discussed. It was found that the aluminum source had significant effect on the synthesis of membranes. The ZSM-5 membranes prepared by using Al₂(SO₄)₃·18H₂O as an aluminum source from synthetic gel with composition of 1SiO₂/0.05Al₂O₃/0.17Na₂O/0.9NaF/45H₂O showed high reproducibility and high PV performance with flux of 3.85 kg/(m²·h) and separation factor of higher than 10,000 in dehydration of 90 wt % i-PrOH/H₂O at 348 K. Moreover, the ZSM-5 membranes exhibited high water perm-selectivity performance for dehydration of 90 wt % n-PrOH/H₂O, n-BtOH/H₂O, and i-BtOH/H₂O mixtures, respectively.