期刊
JOURNAL OF MEMBRANE SCIENCE
卷 428, 期 -, 页码 198-204出版社
ELSEVIER
DOI: 10.1016/j.memsci.2012.10.020
关键词
Perovskite membrane; Hollow fibre; Oxygen permeation; Surface modification
资金
- National Natural Science Foundation of China (NNSFC) [20976098, 21176187]
- Tianjin Research Program of Application Foundation and Advanced Technology [11JCZDJC23400]
- Royal Academy of Engineering Research Exchanges with China and India Scheme
La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) perovskite hollow fibre membranes with an asymmetric structure were fabricated by the phase inversion-sintering technique. The oxygen permeation flux is increased noticeably due to the porous inner surface. Additional coating of a porous perovskite layer as a promoter on the inner and/or outer surfaces of the LSCF hollow fibres further promotes the oxygen permeation due to the acceleration of the surface exchange kinetics. Several typical perovskites such as SrCo0.8Fe0.2O3-delta (SCFe), Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), SrCo0.9Sc0.1O3-delta (SCSc), SrCo0.9Nb0.1O3-delta (SCNb) as well as LSCF itself were used as the promoters. The permeation results indicate that the oxygen permeation flux of the LSCF hollow fibre membranes has been further improved remarkably by the surface-coating modification. The enhancing effect of the SrCoO3-delta (SC)-based perovskites on oxygen permeation follows the order of SCSc > BSCF > SCNb similar to SCFe > LSCF. This coating strategy can be applied to evaluate the catalytic activity of the perovskites to surface exchange reactions for the preparation of oxygen permeable membranes. Coating of the perovskites on the downstream membrane surface exhibits better enhancement than on the upstream membrane surface, but coating on both membrane surfaces may promote the oxygen permeation to the largest extent. By combing the individual advantages of different perovskite oxides, the resultant composite membranes may be of high permeability, high mechanical strength and high stability. (C) 2012 Elsevier B.V. All rights reserved.
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