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Oxygen permeability and structural stability of a novel tantalum‐doped perovskite BaCo 0.7 Fe 0.2 Ta 0.1 O 3− δ
Author(s) -
Luo Huixia,
Tian Bingbing,
Wei Yanying,
Wang Haihui,
Jiang Heqing,
Caro Jürgen
Publication year - 2010
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.12044
Subject(s) - perovskite (structure) , oxygen , materials science , tantalum , permeation , oxygen permeability , analytical chemistry (journal) , chemistry , crystallography , membrane , metallurgy , biochemistry , organic chemistry , chromatography
Dense BaCo 0.7 Fe 0.2 Ta 0.1 O 3−δ (BCFT) perovskite membranes were successfully synthesized by a simple solid state reaction. In situ high‐temperature X‐ray diffraction indicated the good structure stability and phase reversibility of BCFT at high temperatures. The thermal expansion coefficient (TEC) of BCFT was determined to amount 1.02 × 10 −5 K −1 , which is smaller than those of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) (1.15 × 10 −5 K −1 ), SrCo 0.8 Fe 0.2 O 3−δ (SCF) (1.79 × 10 −5 K −1 ), and BaCo 0.4 Fe 0.4 Zr 0.2 O 3−δ (BCFZ) (1.03 × 10 −5 K −1 ). It can be seen that the introduction of Ta ions into the perovskite framework could effectively lower the TEC. Thickness dependence studies of oxygen permeation through the BCFT membrane indicated that the oxygen permeation process was controlled by bulk diffusion. A membrane reactor made from BCFT was successfully operated for the partial oxidation of methane to syngas at 900°C for 400 h without failure and with the relatively high, stable oxygen permeation flux of about 16.8 ml/min cm 2 . © 2009 American Institute of Chemical Engineers AIChE J, 2010