Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 95-100 |
| Seitenumfang | 6 |
| Fachzeitschrift | Catalysis today |
| Jahrgang | 193 |
| Ausgabenummer | 1 |
| Frühes Online-Datum | 1 Feb. 2012 |
| Publikationsstatus | Veröffentlicht - 15 Okt. 2012 |
Abstract
High-purity oxygen was produced by dead-end Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3-δ (BSCF) tube membranes which were sealed by a reaction-diffusion sintering process. First, phase stability of BSCF membrane in a pure oxygen atmosphere - as it is present on the permeate side of the membrane - was studied at 750 and 950 °C, respectively. After the identification of stable operation conditions of BSCF membranes, we studied the oxygen permeation at 950 °C using dead-end BSCF tubes (1 cm outer diameter, 1 mm wall thickness) in (i) a pressure-driven process, (ii) a vacuum process, and (iii) combining both techniques. In all cases, a high oxygen purity of almost 100 vol.% can be obtained at operation temperatures ≥ 850 °C. The oxygen permeation flux, the oxygen recovery, and the oxygen ionic conductivity were investigated. It was found that - for the same oxygen partial pressure difference - the oxygen permeation flux in the vacuum process is significantly higher than that in the pressure-driven process at all investigated temperatures. Moreover, in all cases, oxygen permeation and oxygen ionic conductivity can be described by the Wagner theory for bulk diffusion of oxygen ions as rate-limiting step with the logarithmic ratio of the oxygen partial pressures on feed and permeate sides as driving force.
ASJC Scopus Sachgebiete
- Chemische Verfahrenstechnik (insg.)
- Katalyse
- Chemie (insg.)
- Allgemeine Chemie
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in: Catalysis today, Jahrgang 193, Nr. 1, 15.10.2012, S. 95-100.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - High-purity oxygen production by a dead-end Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3-δ tube membrane
AU - Liang, Fangyi
AU - Jiang, Heqing
AU - Luo, Huixia
AU - Kriegel, Ralf
AU - Caro, Jürgen
PY - 2012/10/15
Y1 - 2012/10/15
N2 - High-purity oxygen was produced by dead-end Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3-δ (BSCF) tube membranes which were sealed by a reaction-diffusion sintering process. First, phase stability of BSCF membrane in a pure oxygen atmosphere - as it is present on the permeate side of the membrane - was studied at 750 and 950 °C, respectively. After the identification of stable operation conditions of BSCF membranes, we studied the oxygen permeation at 950 °C using dead-end BSCF tubes (1 cm outer diameter, 1 mm wall thickness) in (i) a pressure-driven process, (ii) a vacuum process, and (iii) combining both techniques. In all cases, a high oxygen purity of almost 100 vol.% can be obtained at operation temperatures ≥ 850 °C. The oxygen permeation flux, the oxygen recovery, and the oxygen ionic conductivity were investigated. It was found that - for the same oxygen partial pressure difference - the oxygen permeation flux in the vacuum process is significantly higher than that in the pressure-driven process at all investigated temperatures. Moreover, in all cases, oxygen permeation and oxygen ionic conductivity can be described by the Wagner theory for bulk diffusion of oxygen ions as rate-limiting step with the logarithmic ratio of the oxygen partial pressures on feed and permeate sides as driving force.
AB - High-purity oxygen was produced by dead-end Ba 0.5Sr 0.5Co 0.8Fe 0.2O 3-δ (BSCF) tube membranes which were sealed by a reaction-diffusion sintering process. First, phase stability of BSCF membrane in a pure oxygen atmosphere - as it is present on the permeate side of the membrane - was studied at 750 and 950 °C, respectively. After the identification of stable operation conditions of BSCF membranes, we studied the oxygen permeation at 950 °C using dead-end BSCF tubes (1 cm outer diameter, 1 mm wall thickness) in (i) a pressure-driven process, (ii) a vacuum process, and (iii) combining both techniques. In all cases, a high oxygen purity of almost 100 vol.% can be obtained at operation temperatures ≥ 850 °C. The oxygen permeation flux, the oxygen recovery, and the oxygen ionic conductivity were investigated. It was found that - for the same oxygen partial pressure difference - the oxygen permeation flux in the vacuum process is significantly higher than that in the pressure-driven process at all investigated temperatures. Moreover, in all cases, oxygen permeation and oxygen ionic conductivity can be described by the Wagner theory for bulk diffusion of oxygen ions as rate-limiting step with the logarithmic ratio of the oxygen partial pressures on feed and permeate sides as driving force.
KW - BSCF
KW - Dead-end membrane
KW - Oxygen permeation
KW - Oxygen transporting membrane
KW - Perovskite
UR - http://www.scopus.com/inward/record.url?scp=84866261508&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2011.12.016
DO - 10.1016/j.cattod.2011.12.016
M3 - Article
AN - SCOPUS:84866261508
VL - 193
SP - 95
EP - 100
JO - Catalysis today
JF - Catalysis today
SN - 0920-5861
IS - 1
ER -