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Catalytic Oxide‐Ion Conducting Materials for Surface Activation of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3‐δ Membranes
Author(s) -
Lobera M. Pilar,
Balaguer María,
GarcíaFayos Julio,
Serra José M.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700530
Subject(s) - cobaltite , catalysis , activation energy , perovskite (structure) , materials science , oxide , membrane , oxygen , atmospheric temperature range , permeation , inorganic chemistry , ion exchange , strontium , chemical engineering , analytical chemistry (journal) , ion , chemistry , metallurgy , chromatography , biochemistry , organic chemistry , physics , meteorology , engineering
Abstract The oxygen permeation process through mixed ionic‐electronic conducting (MIEC) membranes thicker than the characteristic thickness of the material at low temperature is controlled by the catalytic oxygen exchange on both surfaces of the membrane. Different strontium ferrite‐cobaltite compounds ( A 0.6 Sr 0.4 Co 0.5 Fe 0.5 O 3‐δ and Ba 0.6 Sr 0.4 B O 3‐δ ) and doped cerias (Ce 1‐x Ln x O 2‐δ ) were tested as catalyst for the oxygen exchange reaction in the surface of the membranes. Changes in the activation energy for the permeation of BSCF are observed around 800 °C, and are related to a change in the surface exchange mechanism. All deposited catalytic layers enabled to decrease the activation energy of the membranes in the low temperature range. The microstructure of the layer showed the strongest effect on the exchange rate enhancement. The evaluation of the stability of the catalysts in CO 2 shows that both A and B‐site doping in the perovskite decrease the tendency to form carbonates.