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Amine‐Appended Hierarchical Ca‐A Zeolite for Enhancing CO 2 /CH 4 Selectivity of Mixed‐Matrix Membranes
Author(s) -
Nguyen Tien Hoa,
Gong Heqing,
Lee Siew Siang,
Bae TaeHyun
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600561
Subject(s) - membrane , selectivity , amine gas treating , polymer , zeolite , mesoporous material , permeation , polymer chemistry , chemical engineering , molecular sieve , chemistry , matrix (chemical analysis) , polyethylene , materials science , organic chemistry , adsorption , chromatography , catalysis , biochemistry , engineering
An amine‐appended hierarchical Ca‐A zeolite that can selectively capture CO 2 was synthesized and incorporated into inexpensive membrane polymers, in particular polyethylene oxide and Matrimid, to design mixed‐matrix membranes with high CO 2 /CH 4 selectivities. Binary mixture permeation testing reveals that amine‐appended mesoporous Ca‐A is highly effective in improving CO 2 /CH 4 selectivity of polymeric membranes. In particular, the CO 2 /CH 4 selectivity of the polyethylene oxide membrane increases from 15 to 23 by incorporating 20 wt % amine‐appended Ca‐A zeolite. Furthermore, the formation of filler/polymer interfacial defects, which is typically found in glassy polymer‐zeolite pairs, is inhibited owing to the interaction between the amine groups on the external surface of zeolites and polymer chains. Our results suggest that the amine‐appended hierarchial Ca‐A, which was utilized in membrane fabrication for the first time, is a good filler material for fabricating a CO 2 ‐selective mixed‐matrix membrane with defect‐free morphology.