Metal doped silica membrane reactor: Operational effects of reaction and permeation for the water gas shift reaction

Battersby, S., Duke, M. C., Liu, S., Rudolph, V. and Diniz Da Costa, J. C. (2008) Metal doped silica membrane reactor: Operational effects of reaction and permeation for the water gas shift reaction. Journal of Membrane Science, 316 1-2: 46-52. doi:10.1016/j.memsci.2007.11.021


Author Battersby, S.
Duke, M. C.
Liu, S.
Rudolph, V.
Diniz Da Costa, J. C.
Title Metal doped silica membrane reactor: Operational effects of reaction and permeation for the water gas shift reaction
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
1873-3123
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.memsci.2007.11.021
Open Access Status Not yet assessed
Volume 316
Issue 1-2
Start page 46
End page 52
Total pages 7
Editor A. L. Zydney
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Language eng
Subject C1
850301 Hydrogen Production from Fossil Fuels
850407 Transformation of Coal into Gaseous Fuels
090402 Catalytic Process Engineering
090404 Membrane and Separation Technologies
Abstract In this work, we investigate the performance of metal (Cobalt) doped silica membranes in a membrane reactor (MR) configuration for the low temperature water gas shift (WGS) reaction. The membranes were hydrostable and showed activated transport even after 2 weeks exposure to steam. High CO conversions resulted in the H-2 and CO partial pressures in the reaction chamber moving in opposite directions, thus favouring H-2/CO separation to treble (5-15) from 150 to 250 degrees C. On the other hand, the separation of H-2/CO2 remained relatively low (2-4) as the driving force for diffusion or partial pressure of these gases remained equal in the reaction chamber irrespective of the extent of conversion. Below approximately 40% CO conversion, the MR is ineffective as the H-2 driving force for permeation was so low that H-2/CO selectivity was below unity. Operating under equilibrium limited conversion (space velocities 7500 h(-1)) conditions, very high conversions in excess of 95% were observed and there were no significant advantages of the MR performance over the packed bed reactor (PBR). However, for higher throughputs (space velocities 38000 and 75000h(-1)) conversion is affected by the reaction rate, and relatively enough H-2 is removed from the reactor through the membrane. Increasing temperature to 250 degrees C as a function of the space velocity (75000h(-1)) allowed for the CO conversion in the MR to shift up to 12% as compared to the PBR.
Keyword Metal doped silica
Membrane reactor
Water gas shift reaction
Gas separation
CO conversion
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Excellence in Research Australia (ERA) - Collection
 
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Created: Thu, 26 Mar 2009, 22:05:04 EST by Amanda Lee on behalf of School of Chemical Engineering