Mixed conductivity and electrocatalytic performance of SrFeO3-delta-SrAl2O4 composite membranes
authors Yaremchenko, AA; Kharton, VV; Valente, AA; Shaula, AL; Marques, FMB; Rocha, J
nationality International
journal SOLID STATE IONICS
author keywords mixed conductor; composite; oxygen permeability; thermal expansion; methane; oxidation
keywords OXYGEN PERMEABILITY
abstract Oxygen-ionic and electronic transport in dense (SrFe)(1-x)(SrAl2)(x)O-z composites, consisting of strontium-deficient Sr(Fe,Al)O3-delta and SrAl2O4 phases, is determined by the properties of perovskite-like solid solution. Increasing the content of SrAl2O4, with a total conductivity as low as 5 x 10(-7) - 10(-5) S x cm(-1) at 973-1273 K in air, results in the gradual decrease of the partial conductivities, but also enables the suppression of thermal expansion. Compared to single-phase SrFe1-xAlxO3-delta, (SrFe)(1-x)(SrAl2)(x)O-z composites exhibit enhanced thermomechanical properties, while the oxygen permeability of these materials has similar values. The composite membranes exhibit stable performance under air/(H-2-H2O-N-2) and air/(CH4-He) gradients at 973-1173 K. The oxidation of dry methane by oxygen permeating through (SrFe)(0.7)(SrAl2)(0.3)O-z results in dominant total oxidation, suggesting the necessity to incorporate a reforming catalyst into the ceramic reactors for natural gas conversion. (c) 2006 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2006
volume 177
issue 26-32
beginning page 2285
ending page 2289
digital object identifier (doi) 10.1016/j.ssi.2006.03.039
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000242611800016
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journal analysis (jcr 2017):
journal impact factor 2.751
5 year journal impact factor 2.607
category normalized journal impact factor percentile 58.483
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