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  High-purity oxygen production by a dead-end Ba0.5Sr0.5Co0.8Fe0.2O3-delta tube membrane

Liang, F., Jiang, H., Luo, H., Kriegel, R., & Caro, J. (2012). High-purity oxygen production by a dead-end Ba0.5Sr0.5Co0.8Fe0.2O3-delta tube membrane. CATALYSIS TODAY, 193(1), 95-100. doi:10.1016/j.cattod.2011.12.016.

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 Creators:
Liang, Fangyi1, Author
Jiang, Heqing2, Author           
Luo, Huixia1, Author
Kriegel, Ralf3, Author
Caro, Jürgen1, Author
Affiliations:
1Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, DE, ou_1445589              
3Fraunhofer Inst Ceram Technol & Syst IKTS, D-07629 Hermsdorf, ou_persistent22              

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Free keywords: Oxygen permeation; Oxygen transporting membrane; Perovskite; Dead end membrane; BSCF
 Abstract: High-purity oxygen was produced by dead-end Ba0.5Sr0.5Co0.8Fe0.2O3-delta (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 degrees C, respectively. After the identification of stable operation conditions of BSCF membranes, we studied the oxygen permeation at 950 degrees 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 degrees 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. (c) 2011 Elsevier B.V. All rights reserved.

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 Dates: 2012-10-15
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.cattod.2011.12.016
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Title: CATALYSIS TODAY
Source Genre: Journal
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Pages: - Volume / Issue: 193 (1) Sequence Number: - Start / End Page: 95 - 100 Identifier: -