abstract
In order to assess membrane architecture-related effects on the oxygen transport through ferrite-based mixed conductors, a series of planar ceramic membranes with dense layers made of the dual-phase (SrFeO3-delta)(0.7)(SrAl2O4)(0.3) composite were appraised at 1023-1223 K under oxidizing conditions. The asymmetric membranes with porous La0.5Sr0.5.FeO3-delta and (SrFeO3-delta)(0.7)(SrAl2O4)(0.3) supports were fabricated by a two-stage compaction procedure using various pore-forming additives and sintering at 1623-1723 K. Analysis of the oxygen permeation fluxes through model symmetric membranes showed significant limiting role of the composite surface oxygen exchange. At temperatures above 1173 K, a substantially improved performance was observed for asymmetric self-supported composite membranes with the dense layer thickness of 0.12 mm, surface-modified with (SrFeO3-delta)0.7(SrAl2O4)(0.3)-Pt mixture. At 1023-1173 K, higher oxygen fluxes were achieved using perovskite-type La0.5Sr0.5FeO3-delta as the porous support material. (c) 2007 Elsevier B.V. All rights reserved.
keywords
TRANSPORT-PROPERTIES; THERMAL-EXPANSION; THERMOMECHANICAL PROPERTIES; SEPARATION MEMBRANES; COMPOSITE MEMBRANES; PEROVSKITE; STABILITY; FE; NI; CO
subject category
Chemistry; Physics
authors
Kovalevsky, AV; Kharton, VV; Snijkers, FMM; Cooymans, JFC; Luyten, JJ; Frade, JR
our authors
Andrei Kavaleuski
Principal Researcher
Jorge Ribeiro Frade
Retired Professor