Hydrothermal Stability of Modified Silica Membranes for Gas Separation

Giessler, S., Duke, M. C., Diniz da Costa, J. C. and Lu, G. Q. (2001). Hydrothermal Stability of Modified Silica Membranes for Gas Separation. In: D. G. Wood, 6th World Congress of Chemical Engineering, Melbourne, Australia, (1-10). 23-27 September, 2001.

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Author Giessler, S.
Duke, M. C.
Diniz da Costa, J. C.
Lu, G. Q.
Title of paper Hydrothermal Stability of Modified Silica Membranes for Gas Separation
Conference name 6th World Congress of Chemical Engineering
Conference location Melbourne, Australia
Conference dates 23-27 September, 2001
Place of Publication Melbourne, VIC, Australia
Publisher I. E. Aust
Publication Year 2001
Sub-type Fully published paper
Editor D. G. Wood
Volume Proceedings CDROM Paper 239
Start page 1
End page 10
Total pages 10
Language eng
Abstract/Summary A new class of hybrid molecular sieve silica (MSS) membranes is developed and tested against standard and organic templated membranes. The hybrid membrane is synthesized by the standard sol-gel process, integrating a template (methyltriethoxysilane - MTES) and a C6 surfactant (triethylhexylammonium bromide) into the silica film matrix. After hydro treatment under a relative humidity of 96% for 50h, the hybrid membrane shows no changes in its gas separation capabilities or energy of mobility. The structural characteristics and integrity of the hybrid membrane are retained due to a high concentration of organophilic functional groups and alkoxides observed using 29 Si NMR. In contrast, the structural integrity of the membranes prepared with non-templated films deteriorated during the hydro treatment due to a large percentage of silanol groups (Si-OH) which react with water. The hybrid membranes underwent a decrease in the H2/CO2 selectivity of only 1% whereas for the non-templated membrane a 21% decrease was observed. The transport mechanism of the hybrid membranes is activated as permeation increased with temperature. The activation energy for the permeation of H2 is positive while negative for CO2. The H2 permeation obtained was 3x 10 -8 mol.m -2 .s -1 .Pa -1 and permselectivities for H2/CO2 and H2/N2 varied between 1-7 and 31-34, respectively.
Subjects 290603 Membrane and Separation Technologies
250200 Inorganic Chemistry
Keyword molecular sieve silica membranes
MSS membranes
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