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    C-H Activation by Ozone in Liquid CO2 Using Cyclohexane and Iso-octane as Substrates

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    Available after: 2019-12-31 (2.218Mb)
    Issue Date
    2018-12-31
    Author
    CHEN, XUHUI
    Publisher
    University of Kansas
    Format
    63 pages
    Type
    Thesis
    Degree Level
    M.S.
    Discipline
    Chemical & Petroleum Engineering
    Rights
    Copyright held by the author.
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    Abstract
    The study of cyclohexane and isooctane activation by ozone with liquid CO2 as reaction medium in a Parr reactor equipped with in situ infrared detector demonstrated a facile and efficient method for alkane activation. The dominant presence of CO2 in vapor phase imparts safety to system by maintaining vapor concentration of reactants below the lower flammability limit. At 280 K, 6.9 MPa, with a molar feed ozone: cyclohexane ratio of approximately 50%, the cyclohexane conversion was approximately ~12% with KA oil (a mixture of cyclohexanone and cyclohexanol) yield around 11%. Small but measurable amount of hydrogen peroxide was formed during the reaction. The observed products are consistent with predicted reaction pathways via the hydrotrioxide route. The absence of any detectable water in the product and the close match of cyclohexane conversion and product yield rule out significant combustion of cyclohexane. The various oxygenated products detected from the ozonolysis of isooctane in liquid CO2 medium suggest that ozone has the ability in activating all types of C-H bonds within isooctane. These results pave the way for systematic investigations of C-H bond activation in lighter alkanes such as methane and those present in natural gas liquids.
    URI
    http://hdl.handle.net/1808/27814
    Collections
    • Engineering Dissertations and Theses [1055]
    • Theses [3827]

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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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