Impact of sulphur contamination on the oxygen transport mechanism through Ba0.5Sr0.5Co0.8Fe0.2O3-delta: Relevant issues in the development of capillary and hollow fibre membrane geometry.
authors Yaremchenko, AA; Buysse, C; Middelkoop, V; Snijkers, F; Buekenhoudt, A; Frade, JR; Kovalevsky, AV
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords BSCF; Hollow fibre; Oxygen membrane; Surface exchange; Surface activation
keywords SURFACE EXCHANGE; PERMEATION; SEPARATION; ION; PERMEABILITY; PERFORMANCE; TECHNOLOGY; COMPOSITES; STABILITY; SYNGAS
abstract Fabrication of dense perovskite membranes in the form of capillaries or hollow fibres is considered attractive for large-scale oxygen separation applications. For the preparation of such membranes by phase-inversion process polysulphone or polyethersulphone are commonly used as a binder. The decomposition of the sulphur-containing binder during the calcination leads to the formation of sulphates, which negatively affect the oxygen permeation through the membrane. The present work focuses on the comparative analysis of the oxygen transport mechanism through sulphur-free and containing Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) membranes. The analysis of the thickness dependence of the oxygen permeation fluxes indicated that sulphates decrease the permeation rate mostly due to the partial blocking of the surface oxygen exchange, whilst the bulk ambipolar conductivity remains essentially unchanged. SEM/EDS studies revealed segregation of BaSO4 at the grain boundaries, which might be responsible for the fast oxygen exchange in phase-pure BSCF. The negative impact of sulphur contamination on oxygen permeation was more pronounced at temperatures below 1123 K. It has been demonstrated, that, by surface activation, the oxygen flux through sulphur-containing BSCF membranes can be increased to the level of that of sulphur-free membranes. (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
year published 2013
volume 428
beginning page 123
ending page 130
digital object identifier (doi) 10.1016/j.memsci.2012.10.033
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000313653700015
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journal analysis (jcr 2017):
journal impact factor 6.578
5 year journal impact factor 6.656
category normalized journal impact factor percentile 95.461
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