Processing, stability and oxygen permeability of Sr(Fe, Al)O-3-based ceramic membranes
authors Kharton, VV; Shaula, AL; Snijkers, FMM; Cooymans, JFC; Luyten, JJ; Yaremchenko, AA; Valente, AA; Tsipis, EV; Frade, JR; Marques, FMB; Rocha, J
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords ceramic membrane processing; mixed conductor; surface activation; oxygen permeation; ionic transport; methane oxidation
keywords PARTIAL OXIDATION; REDUCING ATMOSPHERE; METHANE; PEROVSKITE; SYNGAS; CONDUCTIVITY; REACTORS; SURFACE; EXPANSION; TRANSPORT
abstract Minor additions of alumina into perovskite-type SrFe0.7Al0.3O3-delta, a composition close to the solid solution formation limits in SrFe1-xAlxO3-delta system, result in decreasing thermal expansion and increasing oxygen permeability. The improved sinterability of SrFe0.7Al0.3O3-based composite with 3 wt.% Al2O3 addition enables to fabricate high-quality tubular membranes for the methane conversion reactors. No essential degradation in the performance of SrFe0.7Al0.3O3-delta membranes under air/CH4 or air/H-2-H2O gradients at 973-1223 K was observed during 200-700h. The stable operation under high oxygen chemical potential gradients is possible due to surface-limited oxygen transport, indicated by the dependencies of oxygen permeability on the membrane thickness. Applying porous layers of the same composition, synthesized via cellulose-precursor technique, onto the permeate-side surface leads to substantially higher oxygen fluxes. For a model reactor with the surface-modified SrFe0.7Al0.3O3-delta membrane and commercial Ni/Al2O3 catalyst, the CH4 conversion rate achieved 90-97% at 1073-1123 K, when the CO selectivity was almost 100%. (c) 2005 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
year published 2005
volume 252
issue 1-2
beginning page 215
ending page 225
digital object identifier (doi) 10.1016/j.memsci.2004.12.018
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000228850700021
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journal impact factor 6.578
5 year journal impact factor 6.656
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