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Pure‐silica MFI zeolite membrane by cooperative templating approach for ethanol‐water separation
Author(s) -
Lan Jiancheng,
Li Linzhe,
Song Wensen,
Saulat Hammad,
Wu Haowen,
Yang Jianhua,
Yang Chengmin,
Li Yang,
Lu Jinming,
Zhang Yan
Publication year - 2021
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.17184
Subject(s) - zeolite , chemistry , tetraethylammonium , membrane , ethanol , crystallization , selectivity , molecular sieve , molar ratio , ammonium , chemical engineering , chromatography , nuclear chemistry , organic chemistry , adsorption , catalysis , potassium , biochemistry , engineering
Pure‐silica MFI zeolite membrane composed of intergrown four prism crystals was fabricated by using tetrabutylammonium (TBA + ) and tetraethylammonium (TEA + ) as cooperating templates and the induced function of MFI seeds under synthesis solution with molar composition of 1TEOS:0.2TBAOH:0.2TEABr:180H 2 O. The ethanol/water separation factor was 64 with a flux of 1.40 kg m −2 hr −1 for 5 wt% ethanol/water mixture at 60°C. In contrast, single TBAOH and TEAOH template led to formation of uncontinuous MEL and MFI membrane respectively, without ethanol‐selectivity. The behavior of quaternary ammonium (TBA + and TEA + ) varied in different system: (a) In “TBA + + TEA + ” system, TBA + and TEA + were incorporated into MFI zeolite channel simultaneously; (b) In “TPA + + M + ” system (M = TEA or TBA), either TEA + or TBA + could not be occluded into channel, however, appropriate amount of TBA + could accelerate membrane crystallization, meanwhile increase in TEA + slowed down crystallization rate of MFI membrane. This work extends the alternative preparation approaches of ethanol perm‐selective MFI membrane.