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Oxygen transport kinetics of MIEC membranes coated with different catalysts
Author(s) -
Liu Yan,
Zhu Yue,
Li Mingrun,
Zhu Xuefeng,
Yang Weishen
Publication year - 2016
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15239
Subject(s) - catalysis , membrane , oxygen , permeation , chemistry , chemical engineering , diffusion , kinetics , oxygen transport , ionic bonding , inorganic chemistry , materials science , organic chemistry , thermodynamics , ion , biochemistry , physics , quantum mechanics , engineering
Oxygen permeation through mixed ionic‐electronic conducting membrane may be controlled by oxygen bulk diffusion and/or oxygen interfacial exchange kinetics. In this article, we chose BaCe 0.05 Fe 0.95 O 3‐δ (BCF) as a representative to study the oxygen transport resistances of the membrane coated with different porous catalysts, including BCF itself, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3‐δ (BSCF) and Sm 0.5 Sr 0.5 CoO 3‐δ (SSC). The oxygen transport resistances of bulk, gas‐solid interfaces of feed‐side and sweep‐side of the catalyst‐coated membranes can be separately obtained through a linear regression of experimental data according to an oxygen permeation model. The three resistances of the membrane coated with BCF catalyst are smaller than those of the membrane coated with BSCF and SSC catalysts, although BSCF catalyst itself has the fastest bulk diffusion and interfacial exchange kinetics. The catalytic activities of BSCF and SSC catalysts on BCF membranes are impacted by the transport kinetics of catalysts, microstructure of catalyst layers, and cationic inter‐diffusion between the membrane and catalysts. © 2016 American Institute of Chemical Engineers AIChE J , 62: 2803–2812, 2016