Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 62-70 |
| Seitenumfang | 9 |
| Fachzeitschrift | Journal of membrane science |
| Jahrgang | 344 |
| Ausgabenummer | 1-2 |
| Frühes Online-Datum | 30 Juli 2009 |
| Publikationsstatus | Veröffentlicht - 15 Nov. 2009 |
Abstract
Zinc-doped (BaSr)FeO3-δ perovskite-type membranes were found to exhibit excellent long-term stability at high and intermediate temperatures under an oxygen partial pressure difference of p1/p2 = 21/2.1 × 103 Pa at 950 °C and p1/p2 = 21/0.8 × 103 Pa at 750 °C. After the change to carbon dioxide as the sweep gas, the oxygen permeation diminishes almost completely. By XRD, a phase mixture of hexagonal, tetragonal and cubic perovskite with a (Ba0.4±0.1Sr0.6±0.1)CO3 layer and some zinc oxide was found. TEM showed that the dense perovskite membrane is decomposed into phases with different morphologies accompanied by pore and crack formation in a surface layer with a depth of approximately 5 μm. After switching to helium as the sweep gas, the carbonate layer is decomposed, but a hexagonal and tetragonal perovskite phase in addition to the cubic phase are still present. A short heating to 950 °C regenerates the oxygen permeation flux due to the abatement of hexagonal perovskite for the benefit of the cubic and tetragonal perovskite phase. The appearance of the carbonate structure, even to a small amount of 8%, leads to a breakdown of the oxygen permeation ability, but also the hexagonal perovskite is disadvantageous. In contrast, the cubic and tetragonal perovskite modifications exhibit good oxygen permeation abilities. The effect of the carbon dioxide is totally reversible after a short high temperature treatment.
ASJC Scopus Sachgebiete
- Biochemie, Genetik und Molekularbiologie (insg.)
- Biochemie
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Chemische Verfahrenstechnik (insg.)
- Filtration und Separation
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in: Journal of membrane science, Jahrgang 344, Nr. 1-2, 15.11.2009, S. 62-70.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Performance of zinc-doped perovskite-type membranes at intermediate temperatures for long-term oxygen permeation and under a carbon dioxide atmosphere
AU - Martynczuk, Julia
AU - Efimov, Konstantin
AU - Robben, Lars
AU - Feldhoff, Armin
N1 - Funding Information: The authors greatly acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) under grant number FE 928/1-2 and fruitful discussions with Dr. Mirko Arnold and Prof. Jürgen Caro.
PY - 2009/11/15
Y1 - 2009/11/15
N2 - Zinc-doped (BaSr)FeO3-δ perovskite-type membranes were found to exhibit excellent long-term stability at high and intermediate temperatures under an oxygen partial pressure difference of p1/p2 = 21/2.1 × 103 Pa at 950 °C and p1/p2 = 21/0.8 × 103 Pa at 750 °C. After the change to carbon dioxide as the sweep gas, the oxygen permeation diminishes almost completely. By XRD, a phase mixture of hexagonal, tetragonal and cubic perovskite with a (Ba0.4±0.1Sr0.6±0.1)CO3 layer and some zinc oxide was found. TEM showed that the dense perovskite membrane is decomposed into phases with different morphologies accompanied by pore and crack formation in a surface layer with a depth of approximately 5 μm. After switching to helium as the sweep gas, the carbonate layer is decomposed, but a hexagonal and tetragonal perovskite phase in addition to the cubic phase are still present. A short heating to 950 °C regenerates the oxygen permeation flux due to the abatement of hexagonal perovskite for the benefit of the cubic and tetragonal perovskite phase. The appearance of the carbonate structure, even to a small amount of 8%, leads to a breakdown of the oxygen permeation ability, but also the hexagonal perovskite is disadvantageous. In contrast, the cubic and tetragonal perovskite modifications exhibit good oxygen permeation abilities. The effect of the carbon dioxide is totally reversible after a short high temperature treatment.
AB - Zinc-doped (BaSr)FeO3-δ perovskite-type membranes were found to exhibit excellent long-term stability at high and intermediate temperatures under an oxygen partial pressure difference of p1/p2 = 21/2.1 × 103 Pa at 950 °C and p1/p2 = 21/0.8 × 103 Pa at 750 °C. After the change to carbon dioxide as the sweep gas, the oxygen permeation diminishes almost completely. By XRD, a phase mixture of hexagonal, tetragonal and cubic perovskite with a (Ba0.4±0.1Sr0.6±0.1)CO3 layer and some zinc oxide was found. TEM showed that the dense perovskite membrane is decomposed into phases with different morphologies accompanied by pore and crack formation in a surface layer with a depth of approximately 5 μm. After switching to helium as the sweep gas, the carbonate layer is decomposed, but a hexagonal and tetragonal perovskite phase in addition to the cubic phase are still present. A short heating to 950 °C regenerates the oxygen permeation flux due to the abatement of hexagonal perovskite for the benefit of the cubic and tetragonal perovskite phase. The appearance of the carbonate structure, even to a small amount of 8%, leads to a breakdown of the oxygen permeation ability, but also the hexagonal perovskite is disadvantageous. In contrast, the cubic and tetragonal perovskite modifications exhibit good oxygen permeation abilities. The effect of the carbon dioxide is totally reversible after a short high temperature treatment.
KW - Carbon dioxide
KW - Oxygen permeation
KW - Perovskite membrane
KW - Stability
KW - TEM
UR - http://www.scopus.com/inward/record.url?scp=70049105468&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2009.07.035
DO - 10.1016/j.memsci.2009.07.035
M3 - Article
AN - SCOPUS:70049105468
VL - 344
SP - 62
EP - 70
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
IS - 1-2
ER -