H2S stability and separation performance of cobalt oxide silica membranes

Uhlmann, David, Smart, Simon and Diniz da Costa, João C. (2011) H2S stability and separation performance of cobalt oxide silica membranes. Journal of Membrane Science, 380 1-2: 48-54. doi:10.1016/j.memsci.2011.06.025

Author Uhlmann, David
Smart, Simon
Diniz da Costa, João C.
Title H2S stability and separation performance of cobalt oxide silica membranes
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2011-09-01
Sub-type Article (original research)
DOI 10.1016/j.memsci.2011.06.025
Open Access Status
Volume 380
Issue 1-2
Start page 48
End page 54
Total pages 7
Place of publication Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
This work investigates the effect of hydrogen sulfide (H2S) exposure on cobalt oxide silica (CoOxSi) xerogels and membranes to determine their robustness under sour gas conditions. Fourier transform infra-red spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) revealed no detectable traces of sulfur or any sulfur compounds in CoOxSi xerogels exposed to 50ppm H2S in helium (He) at 200 and 500°C. Similarly N2 adsorption showed no significant change of average pore size or pore volume of the xerogel samples after 48h of H2S exposure. Gravimetric analysis of the xerogels showed that the H2S adsorbs on the CoOxSi surface, possibly by physisorption as no H2S sorption was observed during post-testing analysis with XPS. A CoOxSi membrane was exposed to varied dosings of H2S in He over a period of 160h at 200°C, including an additional testing with 3.2vol% H2O vapour. It was observed that exposure to H2S resulted in a temporary reduction in single gas permeation with the largest effect occurring with the highest concentration of H2S. These results are attributed to physisorbed H2S on the CoOxSi surface, thus slightly impeding the diffusion of He. H2O exposure and H2S+H2O exposure showed similar reversible effects to that of H2S individually, leading to the conclusion that there was no significant interaction between H2S, H2O and the CoOxSi surface. Although H2S permeation was initially measured through the membrane, this quickly became undetectable for the remainder of the experiment. As a result, the CoOxSi membrane concentrated H2S to 70ppm in the retentate stream from a maximum feed H2S 50ppm concentration.
Keyword Cobalt oxide silica
Gas separation membrane
Hydrogen sulfide stability
Gas Shift Reaction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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