Temperature dependent transition point of purity versus flux for gas separation in Fe/Co-silica membranes

Darmawan, Adi, Motuzas, Julius, Smart, Simon, Julbe, Anne and Diniz Da Costa, Joao.C. (2015) Temperature dependent transition point of purity versus flux for gas separation in Fe/Co-silica membranes. Separation and Purification Technology, 151 284-291. doi:10.1016/j.seppur.2015.07.055


Author Darmawan, Adi
Motuzas, Julius
Smart, Simon
Julbe, Anne
Diniz Da Costa, Joao.C.
Title Temperature dependent transition point of purity versus flux for gas separation in Fe/Co-silica membranes
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 1873-3794
1383-5866
Publication date 2015-09-04
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.seppur.2015.07.055
Open Access Status Not Open Access
Volume 151
Start page 284
End page 291
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Formatted abstract
This work investigates the performance of iron cobalt oxide silica membranes for the separation of binary gas mixtures containing H2 and Ar up to 500 °C. A series of membranes were prepared by fixing the iron/cobalt molar ratio at 10/90, 25/75 and 50/50. H2 preferentially permeated though the membranes, and H2 purity in the permeate stream increased with temperature for all H2/Ar binary gas mixtures. The fluxes of H2 from binary gas mixtures complied, for the most part, with a temperature dependent transport mechanism, similar to that delivered by single gas permeation. However, it was notable to observe a “transition point” where H2 purity versus H2 flux clearly changed from temperature independent to temperature dependent. This gas separation transition point was also found to be a function of the quality of the membrane. Indeed the best performing membrane (Fe/Co = 10/90) also had the highest gas separation transition point at ∼70% H2 purity. This reduced to ∼60% for the medium quality membrane (Fe/Co = 25/75) and was at its lowest ∼43% for the lower quality membrane (Fe/Co = 50/50). The binary gas fractions therefore affect the H2 fluxes and H2 purity more significantly than that expected in single gas permeation. Therefore, the relationship between membrane quality and gas separation transition point is established for the first time in this work.
Keyword Binary gas
H2 fluxes
H2 purity
Temperature dependent
Transition point
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
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 5 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 18 Aug 2015, 10:14:55 EST by System User on behalf of Scholarly Communication and Digitisation Service