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Oxygen permeability and structural stability of La0.6Sr0.4Co0.2Fe0.8O3−δ membrane

  • Presented at the 6th Korea-China Workshop on Clean Energy Technology
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Abstract

La0.6Sr0.4Co0.2Fe0.8O3−δ oxides were synthesized by citrate method and hydrothermal method. The oxides prepared by citrate method are perovskite type structure, while the oxides by hydrothermal method have a small amount of secondary phase in the powder. Pyrex glass seal and Ag melting seal provided reliable gas-tight sealing of disk type dense membrane in the range of operation temperature, but commercial ceramic binder could not be removed from the support tube without damage to the tube or membrane. Though the degree of gas tightness increases in the order of glass>Ag>ceramic binder, in the case of glass seal, the undesired spreading of glass leads to an interfacial reaction between it and the membrane and reduction of effective permeation area. The oxygen flux of La0.6Sr0.4Co0.2Fe0.8O3−δ membrane increases with increasing temperature and decreasing thickness, and the oxygen permeation flux through 1.0 mm membrane exposed to flowing air (P h =0.21 atm) and helium (P1=0.037 atm) is ca. 0.33 ml/cm2·min at 950 °C. X-ray diffraction analysis for the membrane after permeation test over 160 h revealed that La2O3 and unknown compound were formed on the surface of membrane. The segregation compounds of surface elements formed on both surfaces of membrane irrespective of spreading of glass sealing material.

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Authors and Affiliations

  1. Energy Conversion Research Department, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Korea

    Jung Hoon Park

  2. Carbon Dioxide Reduction and Sequestration R&D Center, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Korea

    Sang Do Park

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  1. Jung Hoon Park
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  2. Sang Do Park
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Correspondence to Jung Hoon Park.

Additional information

This paper was presented at the 6th Korea-China Workshop on Clean Energy Technology held at Busan, Korea, July 4–7, 2006.

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Park, J.H., Park, S.D. Oxygen permeability and structural stability of La0.6Sr0.4Co0.2Fe0.8O3−δ membrane. Korean J. Chem. Eng. 24, 897–905 (2007). https://doi.org/10.1007/s11814-007-0062-2

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  • DOI: https://doi.org/10.1007/s11814-007-0062-2

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