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LTA/Poly(1‐trimethylsilyl‐1‐propyne) Mixed‐Matrix Membranes for High‐Temperature CO 2 /N 2 Separation
Author(s) -
FernándezBarquín Ana,
CasadoCoterillo Clara,
Palomino Miguel,
Valencia Susana,
Irabien Angel
Publication year - 2015
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400641
Subject(s) - zeolite , membrane , thermal stability , propyne , chemical engineering , materials science , trimethylsilyl , thermogravimetric analysis , polymer chemistry , chemistry , organic chemistry , catalysis , biochemistry , engineering
Abstract Mixed‐matrix membranes (MMM) consisting of poly(1‐trimethylsilyl‐1‐propyne) (PTMSP) as continuous matrix and small‐pore LTA‐framework zeolites with Si/Al ratios from 1 (commercial zeolite A) to ∞ (ITQ‐29) as dispersed phase were prepared by solution casting. The thermal stability of the MMM is as high as that of glassy PTMSP polymer, whose high permeability is maintained even at increasing temperature. The effect of the Si/Al ratio in the zeolite fillers on the membrane performance is observed by the increasing CO 2 /N 2 permselectivity of low‐Si/Al ratio zeolite A‐based membranes, in comparison with pure silica ITQ‐29. The performance of the LTA‐type zeolite‐PTMSP MMM was adjusted to the modified Maxwell model by estimating the chain immobilization factor and the interphase thickness as a function of temperature, Si/Al ratio, and zeolite loading.