Hydrothermal stability of cobalt silica membranes in a water gas shift membrane reactor

Battersby, S., Smart, S., Ladewig, B., Liu, S. M., Duke, M. C., Rudolph, V. and Diniz da Costa, J. C. (2009) Hydrothermal stability of cobalt silica membranes in a water gas shift membrane reactor. SEPARATION AND PURIFICATION TECHNOLOGY, 66 2: 299-305. doi:10.1016/j.seppur.2008.12.020

Author Battersby, S.
Smart, S.
Ladewig, B.
Liu, S. M.
Duke, M. C.
Rudolph, V.
Diniz da Costa, J. C.
Title Hydrothermal stability of cobalt silica membranes in a water gas shift membrane reactor
Journal name SEPARATION AND PURIFICATION TECHNOLOGY   Check publisher's open access policy
ISSN 1383-5866
Publication date 2009-04-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.seppur.2008.12.020
Open Access Status DOI
Volume 66
Issue 2
Start page 299
End page 305
Total pages 7
Editor Chen, G.
de Haan, A.
Trien, C.
Van der Brugen, B.
Place of publication The Netherlands
Publisher Elsevier
Language eng
Subject C1
090904 Navigation and Position Fixing
900499 Water and Waste Services not elsewhere classified
Abstract Cobalt silica membranes were fabricated using sol-gel techniques for separation of H-2 in a membrane reactor set up for the low temperature (up to 300 degrees C) water gas shift (WGS) reaction. Single dry gas testing prior to reaction showed He/N-2 and H-2/CO2 selectivities increasing from 75-400 to 45-160 as the temperature increased from 100 to 250 degrees C, respectively. During reaction the membrane delivered a H-2 permeation purity of 89-95% at high conversions, with the higher water ratio conversion providing superior membrane operational performance. Characterisation of bulk gels indicated that the cobalt silica was hydrophilic and exposure to steam at 200 degrees C resulted in the densification of the film matrix. The cobalt doping allowed for the membrane structural microporosity to be maintained as H-2 selectivity was not affected by steam exposure, though the flux decreased due to pore collapse of the film matrix. A total of 8 thermal cycle testing were carried out from room temperature to 300 degrees C, and the membrane displayed good hydrothermal stability, maintaining a high H-2 selectivity for over 200 h of operation
Keyword Hydrothermal Stability
Cobalt Silica
Membrane Reactor
Water Gas Shift
Hydrogen Separation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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Created: Thu, 03 Sep 2009, 18:12:34 EST by Mr Andrew Martlew on behalf of School of Chemical Engineering