Hydrogen gas mixture separation by CVD silica membrane

Gopalakrishnan, Suraj and Diniz Da Costa, João C. (2008) Hydrogen gas mixture separation by CVD silica membrane. Journal of Membrane Science, 323 1: 144-147. doi:10.1016/j.memsci.2008.06.016


Author Gopalakrishnan, Suraj
Diniz Da Costa, João C.
Title Hydrogen gas mixture separation by CVD silica membrane
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2008-10-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.memsci.2008.06.016
Open Access Status Not yet assessed
Volume 323
Issue 1
Start page 144
End page 147
Total pages 4
Editor A. L. Zydney
Place of publication Amsterdam, The Netherlands
Publisher Elsevier Science
Language eng
Subject C1
090404 Membrane and Separation Technologies
850301 Hydrogen Production from Fossil Fuels
850407 Transformation of Coal into Gaseous Fuels
Abstract In this work we investigate the performance of high flux chemical vapour deposition (CVD) silica membranes for the separation of gas mixtures containing H-2 and CO2 at various temperatures. The membranes were prepared by a counter diffusion CVD method where tetraethyl orthosilicate (TEOS) and (O-2 were used as reactants. Single gas permeation resulted in activated transport for the smaller kinetic diameter gases (H-2 and He) whilst the larger kinetic diameter gases (CO2 and N-2) showed negative activation energy. The single gas permeation of H-2 increased from 5.1 x 10(-7) to 7.0 x 10(-7) Mol m(-2) s(-1) Pa-1 in the temperature range 100-400 degrees C. and H-2/CO2 and H-2/N-2 selectivities reached 36 and 57 at 400 degrees C, respectively. The H-2 purity in the permeate stream also increased with temperature for H-2:CO2 binary gas mixture, thus being beneficial for H-2 diffusion. H-2 competitively permeated through the membrane at a several range of gas mixtures. and a saturation level was achieved at H-2:CO2 60:40 feed concentration, where the diffusion of CO2 molecules became negligible delivering similar to 99% H-2 purity in the permeate stream. These results substantiate that the counter diffusion CVD method produced thin silica film membranes with a very precise pore size control, in particular suggesting a narrow pore distribution with average pore radius of about 3.1 angstrom.
Keyword CVD
Gas mixture permeation
H-2 and CO2 separation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes 10.1016/j.memsci.2008.06.016

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Chemical Engineering Publications
 
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Created: Thu, 26 Mar 2009, 22:13:39 EST by Amanda Lee on behalf of School of Chemical Engineering