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Evaluation and fabrication of pore‐size‐tuned silica membranes with tetraethoxydimethyl disiloxane for gas separation
Author(s) -
Lee Hye Ryeon,
Kanezashi Masakoto,
Shimomura Yoshihiro,
Yoshioka Tomohisa,
Tsuru Toshinori
Publication year - 2011
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.12501
Subject(s) - permeance , disiloxane , membrane , microporous material , gas separation , chemical engineering , materials science , knudsen diffusion , fumed silica , nanoporous , selectivity , polymer chemistry , chemistry , composite material , nanotechnology , organic chemistry , permeation , catalysis , biochemistry , engineering
Organic/inorganic hybrid silica membranes were prepared from 1,1,3,3‐tetraethoxy‐1,3‐dimethyl disiloxane (TEDMDS) by the sol‐gel technique with firing at 300–550°C in N 2 . TEDMDS‐derived silica membranes showed high H 2 permeance (0.3–1.1 × 10 −6 mol m −2 s −1 Pa −1 ) with low H 2 /N 2 (∼10) and high H 2 /SF 6 (∼1200) perm‐selectivity, confirming successful tuning of micropore sizes larger than TEOS‐derived silica membranes. TEDMDS‐derived silica membranes prepared at 550°C in N 2 increased gas permeances as well as pore sizes after air exposure at 450°C. TEDMDS had an advantage in tuning pore size by the “template” and “spacer” techniques, due to the pyrolysis of methyl groups in air and SiOSi bonding, respectively. For pore size evaluation of microporous membranes, normalized Knudsen‐based permeance, which was proposed based on the gas translation model and verified with permeance of zeolite membranes, reveals that pore sizes of TEDMDS membranes were successfully tuned in the range of 0.6–1.0 nm. © 2011 American Institute of Chemical Engineers AIChE J, 2011