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    Production of pure oxygen from BSCF hollow fiber membranes using steam sweep

    Access Status
    Fulltext not available
    Authors
    Leo, A.
    Liu, Shaomin
    da Costa, J.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Leo, Adrian and Liu, Shaomin and da Costa, Joao C. Diniz. 2011. Production of pure oxygen from BSCF hollow fiber membranes using steam sweep. Separation and Purification Technology. 78: pp. 220-227.
    Source Title
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2011.02.006
    ISSN
    13835866
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/19093
    Collection
    • Curtin Research Publications
    Abstract

    In this work, BSCF hollow fiber membranes made from a phase inversion/sintering technique produced high purity oxygen (>99.5%) at high flow rate of 9.52 ml min−1 cm−2 at 950 °C using a steam sweep gas. Long term exposure to steam sweep gas revealed loss of performance. For instance, oxygen flux remained stable up to 20 h, though undergoing a significant reduction afterwards. Similarly, the oxygen purity reduced after 40 h testing, though less significantly as oxygen fluxes. We found that steam leached the elements of BSCF, mainly forming an extra layer of insoluble carbonates of barium and strontium. This was attributed to the reaction of the perovskite with carboxylic acid ever present in steam. In addition, steam exposure at high temperature reduced the area of diffraction and crystallite sizes of the reflective planes of the BSCF membrane, thus indicating that the steam exposure deteriorated the crystal ordering. The membrane area exposed to steam become porous while covered with a porous layer of carbonates of barium and strontium, thus limiting the oxygen surface kinetics and explaining the oxygen flux reduction over time.

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