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High performance ZSM‐5 membranes on coarse macroporous α‐Al 2 O 3 supports for dehydration of alcohols
Author(s) -
Li Liangqing,
Yang Jianhua,
Li Jiajia,
Wang Jinqu,
Lu Jinming,
Yin Dehong,
Zhang Yan
Publication year - 2016
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15234
Subject(s) - membrane , pervaporation , dehydration , selectivity , fluoride , crystallization , chemical engineering , aluminium , chemistry , materials science , nuclear chemistry , analytical chemistry (journal) , chromatography , permeation , inorganic chemistry , organic chemistry , catalysis , biochemistry , engineering
High‐performance ZSM‐5 membranes with a low Si/Al ratio of 10.3 were prepared on cheap coarse macroporous α‐Al 2 O 3 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 Al 2 (SO 4 ) 3 ·18H 2 O 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 Al 2 (SO 4 ) 3 ·18H 2 O as an aluminum source from synthetic gel with composition of 1SiO 2 /0.05Al 2 O 3 /0.17Na 2 O/0.9NaF/45H 2 O showed high reproducibility and high PV performance with flux of 3.85 kg/(m 2 ·h) and separation factor of higher than 10,000 in dehydration of 90 wt % i‐PrOH/H 2 O at 348 K. Moreover, the ZSM‐5 membranes exhibited high water perm‐selectivity performance for dehydration of 90 wt % n‐PrOH/H 2 O, n‐BtOH/H 2 O, and i‐BtOH/H 2 O mixtures, respectively. © 2016 American Institute of Chemical Engineers AIChE J , 62: 2813–2824, 2016