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    Mixed Ionic/Electronic Conducting Ceramic Membranes for Oxygen-Assisted CO2 Reforming

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    Slade_ku_0099D_10918_DATA_1.pdf (3.978Mb)
    Issue Date
    2010-03-29
    Author
    Slade, David A.
    Publisher
    University of Kansas
    Format
    332 pages
    Type
    Dissertation
    Degree Level
    Ph.D.
    Discipline
    Chemical & Petroleum Engineering
    Rights
    This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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    Abstract
    Incorporating a SrFeCo0.5Ox (SFC) membrane into a CO2 reforming reactor doubles methane conversion with a powder Pt/ZrO2 catalyst. The deactivation of both Pt/ZrO2 and a Pt/CeZrO2 catalyst is also retarded substantially. Catalyst performance improvement is attributed to a beneficial in situ effect of the SFC membrane on catalyst oxidation state. The SFC membranes exhibit low oxygen flux (< 0.01 sccm/cm^2) and insignificant methane conversion activity. The molecular-level effects of SFC membranes, co-fed gas-phase oxygen, and conventional powder catalyst oxidation state are all assessed using reactor effluent composition trends. A novel single parameter (the Oxidation Factor) is proposed for evaluating product selectivity for CO2 reforming in the presence of oxygen. Membrane oxygen release is attributed entirely to hydrogen oxidation on the membrane surface under these reforming reaction conditions. This claim contradicts a long-standing assumption in the literature that membrane oxygen participates in reforming reactions as molecular oxygen.
    URI
    http://hdl.handle.net/1808/6286
    Collections
    • Engineering Dissertations and Theses [705]
    • Dissertations [2980]

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    785-864-8983

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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