Binary gas mixture and hydrothermal stability investigation of cobalt silica membranes

Liu, Liang, Wang, David K., Martens, Dana L., Smart, Simon and Diniz da Costa, Joao C. (2015) Binary gas mixture and hydrothermal stability investigation of cobalt silica membranes. Journal of Membrane Science, 493 470-477. doi:10.1016/j.memsci.2015.06.058

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Author Liu, Liang
Wang, David K.
Martens, Dana L.
Smart, Simon
Diniz da Costa, Joao C.
Title Binary gas mixture and hydrothermal stability investigation of cobalt silica membranes
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 1873-3123
Publication date 2015-11-01
Sub-type Article (original research)
DOI 10.1016/j.memsci.2015.06.058
Open Access Status File (Author Post-print)
Volume 493
Start page 470
End page 477
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
This work investigates the influence of hydrothermal exposure on the separation performance of sol–gel derived cobalt oxide silica membranes for both single gases (He, H2, CO2 and N2) and binary gas mixtures (He/CO2). The surface area of the materials slightly decreased after exposed to 25 mol% water vapour at 550 °C for 100 h. The membranes complied with activation transport mechanism before and after hydrothermal treatment (HT), and for both single gas and gas mixture permeation. Best values were achieved for He permeance of 3.3×10−7 mol m−2 s−1 Pa−1 at 500 °C and permselectivity of 479 for He/CO2. After HT, the permeance of He and H2 decreased by 28% and 22% at 500 °C, respectively, while the permeance of CO2 increased and resulting in a lower He/CO2 permselectivity of 190. For gas mixtures, the He purity in the permeate side increased from 62% to 97% at 200 °C when the He feed molar concentration increased from 10% to 50% before HT. The He permeance remained unchanged with respect to He feed concentrations and was unaffected by the presence of CO2, although a reduction of He permeance was observed after HT exposure. The He purity in the permeate side was similar before and after HT exposure as a function of the He concentration in the feed side. Hence, the membrane matrix underwent densification though the overall pore size distribution did not broaden after hydrothermal treatment.
Keyword Cobalt silica membranes
Gas mixture
Gas separation
Hydrothermal stability
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 2016 Collection
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