Details
| Original language | English |
|---|---|
| Pages (from-to) | 122-130 |
| Number of pages | 9 |
| Journal | Journal of membrane science |
| Volume | 437 |
| Early online date | 5 Mar 2013 |
| Publication status | Published - 15 Jun 2013 |
Abstract
The SrCo0.8Fe0.2O3-δ (SCF) perovskite was systematically doped with increasing lanthanum content up to 60wt% on the A-site to investigate the effect on CO2 tolerance. Different powders were prepared by a sol-gel method and the materials were characterized by in-situ X-ray diffraction (XRD) and long-term oxygen permeation measurements in CO2-containing atmospheres. The microstructure was investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). All powders exhibit cubic perovskite structure except the rhombohedral La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF 6482), which however, shows a phase transition into cubic perovskite structure at higher temperature. By doping 20wt% lanthanum, the tolerance against CO2 is considerably increased and doping with 60wt% lanthanum resulted in a stable oxygen permeation performance in CO2 atmosphere for at least 200h. Oxygen permeation experiments in an air/helium gradient showed that with increasing lanthanum content the oxygen permeation flux decreases. Microstructure analysis of the membranes after CO2 operation showed that the carbonate preferentially forms a dense layer at the carbon dioxide exposed sweep side of the membranes.
Keywords
- Carbon dioxide, In-situ X-ray diffraction, Long-term oxygen permeation, Oxygen-transporting membrane, Transmission electron microscopy
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 437, 15.06.2013, p. 122-130.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of A-site lanthanum doping on the CO2 tolerance of SrCo0.8Fe0.2O3--δ oxygen-transporting membranes
AU - Klande, Tobias
AU - Ravkina, Olga
AU - Feldhoff, Armin
N1 - Funding Information: The authors greatly acknowledge financial support from the Chinese-German Centre for Science ( GZ676 ) and the Deutsche Forschungsgemeinschaft ( FE 928/4-1 ) and fruitful discussions with Prof. Jürgen Caro.
PY - 2013/6/15
Y1 - 2013/6/15
N2 - The SrCo0.8Fe0.2O3-δ (SCF) perovskite was systematically doped with increasing lanthanum content up to 60wt% on the A-site to investigate the effect on CO2 tolerance. Different powders were prepared by a sol-gel method and the materials were characterized by in-situ X-ray diffraction (XRD) and long-term oxygen permeation measurements in CO2-containing atmospheres. The microstructure was investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). All powders exhibit cubic perovskite structure except the rhombohedral La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF 6482), which however, shows a phase transition into cubic perovskite structure at higher temperature. By doping 20wt% lanthanum, the tolerance against CO2 is considerably increased and doping with 60wt% lanthanum resulted in a stable oxygen permeation performance in CO2 atmosphere for at least 200h. Oxygen permeation experiments in an air/helium gradient showed that with increasing lanthanum content the oxygen permeation flux decreases. Microstructure analysis of the membranes after CO2 operation showed that the carbonate preferentially forms a dense layer at the carbon dioxide exposed sweep side of the membranes.
AB - The SrCo0.8Fe0.2O3-δ (SCF) perovskite was systematically doped with increasing lanthanum content up to 60wt% on the A-site to investigate the effect on CO2 tolerance. Different powders were prepared by a sol-gel method and the materials were characterized by in-situ X-ray diffraction (XRD) and long-term oxygen permeation measurements in CO2-containing atmospheres. The microstructure was investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). All powders exhibit cubic perovskite structure except the rhombohedral La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF 6482), which however, shows a phase transition into cubic perovskite structure at higher temperature. By doping 20wt% lanthanum, the tolerance against CO2 is considerably increased and doping with 60wt% lanthanum resulted in a stable oxygen permeation performance in CO2 atmosphere for at least 200h. Oxygen permeation experiments in an air/helium gradient showed that with increasing lanthanum content the oxygen permeation flux decreases. Microstructure analysis of the membranes after CO2 operation showed that the carbonate preferentially forms a dense layer at the carbon dioxide exposed sweep side of the membranes.
KW - Carbon dioxide
KW - In-situ X-ray diffraction
KW - Long-term oxygen permeation
KW - Oxygen-transporting membrane
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84875764000&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2013.02.051
DO - 10.1016/j.memsci.2013.02.051
M3 - Article
AN - SCOPUS:84875764000
VL - 437
SP - 122
EP - 130
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
ER -