This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1016/j.memsci.2010.02.002 in citations.
Influence of sintering conditions on microstructure and oxygen permeation of Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta) (BSCF) oxygen transport membranes
Influence of sintering conditions on microstructure and oxygen permeation of Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta) (BSCF) oxygen transport membranes
Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) exhibits high oxygen permeability, which is why it is being discussed for gas separation (oxygen transport membrane, OTM) in zero-emission power plants using oxyfuel technology when the membrane is operated in a clean environment, i.e. no flue gas contact. We inve...
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Personal Name(s): | Baumann, S. |
---|---|
Schulze-Küppers, F. / Roitsch, S. / Betz, M. / Zwick, M. / Pfaff, E.M. / Meulenberg, W. A. / Mayer, J. / Stöver, D. | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEF-1 JARA-FIT; JARA-FIT JARA-ENERGY; JARA-ENERGY |
Published in: | Journal of membrane science, 359 (2010) S. 102 - 109 |
Imprint: |
New York, NY [u.a.]
Elsevier
2010
|
Physical Description: |
102 - 109 |
DOI: |
10.1016/j.memsci.2010.02.002 |
Document Type: |
Journal Article |
Research Program: |
Rationelle Energieumwandlung |
Series Title: |
Journal of Membrane Science
359 |
Subject (ZB): | |
Publikationsportal JuSER |
Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) exhibits high oxygen permeability, which is why it is being discussed for gas separation (oxygen transport membrane, OTM) in zero-emission power plants using oxyfuel technology when the membrane is operated in a clean environment, i.e. no flue gas contact. We investigate the influence of membrane processing on microstructure and oxygen permeation. Pure-phase BSCF powder is synthesized using a modified Pechini method. For comparison, commercially available powder is also used, synthesized by a solid-state reaction. Disk-shaped membranes of various microstructures, i.e. closed porosities and grain sizes, are prepared by uniaxial pressing and sintering of the powders processed in different ways. The powders and membranes are characterized by methods including BET, SEM, XRD, and DSC. The microstructures obtained by different sintering conditions are investigated by SEM and TEM. Sintering at 1150 degrees C leads to incongruent melting of BSCF indicated by DSC. The liquid phase appears at three-phase boundaries grain-grain-air and consists of nearly pure cobalt oxide with small impurities of barium and strontium detected by TEM/EDX analysis. Oxygen permeation of the membranes is measured in an air/Ar gradient depending on temperature and membrane microstructure. The closed porosity of different processed membranes is varied between 2 and 15% with uniform grain sizes in the range of approx. 10 mu m. The average grain size is increased from 10 to 45 mu m by increasing the sintering temperature. Neither porosity nor the grain size significantly influences the oxygen permeation rate of 1-mm-thick disks in the investigated parameter range. (C) 2010 Elsevier B.V. All rights reserved. |