• Login
    View Item 
    •   SMARTech Home
    • Georgia Tech Theses and Dissertations
    • Georgia Tech Theses and Dissertations
    • View Item
    •   SMARTech Home
    • Georgia Tech Theses and Dissertations
    • Georgia Tech Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Anti-coking materials for steam crackers

    Thumbnail
    View/Open
    MAHAMULKAR-DISSERTATION-2017.pdf (6.544Mb)
    Date
    2017-04-06
    Author
    Mahamulkar, Shilpa
    Metadata
    Show full item record
    Abstract
    Catalysts that have the potential to minimize coke formation in steam crackers as well as help in the oxidation of these deposits at low temperatures, were developed. A specialized thermo-gravimetric analyzer was used for generation of in-situ coke to simulate coke formed in steam cracking furnaces. Thermally aging the coke generated in-situ in an inert atmosphere increased the graphitic nature of coke and was supported by temperature programmed oxidation studies and Raman analysis. The reaction rate constants for oxidation of coke were determined by fitting a first order rate equation to the mass loss data. Ceria catalyzed oxidation was faster than un-catalyzed oxidation. In addition, α-alumina supported ceria catalysts demonstrated faster kinetics than bulk ceria. The activity of these oxides was related to the availability of these surface oxygen atoms. Gd doped ceria was found to be the best for steam gasification studies and was able to reduce the coke gasification temperature by 65 °C. In addition to steam, Gd, and Mn doped ceria catalysts also showed improved activity for oxidation. In the presence of steam – air mixtures, oxidation due to air dominated the process and Gd showed the best activity by reducing the gasification temperature by 125 °C. Catalytic ceria coatings synthesized in lab, not only reduced catalytic coking by acting like a barrier between the gaseous hydrocarbons and the metallic species on the Incoloy substrate, but also reduced the coke oxidation temperature by ~ 160 °C. Synthesis of catalytic powders and coatings, their characterization, activity towards coke resistance, coke oxidation and gasification are discussed in detail in this work.
    URI
    http://hdl.handle.net/1853/59790
    Collections
    • Georgia Tech Theses and Dissertations [23877]
    • School of Chemical and Biomolecular Engineering Theses and Dissertations [1516]

    Browse

    All of SMARTechCommunities & CollectionsDatesAuthorsTitlesSubjectsTypesThis CollectionDatesAuthorsTitlesSubjectsTypes

    My SMARTech

    Login

    Statistics

    View Usage StatisticsView Google Analytics Statistics
    facebook instagram twitter youtube
    • My Account
    • Contact us
    • Directory
    • Campus Map
    • Support/Give
    • Library Accessibility
      • About SMARTech
      • SMARTech Terms of Use
    Georgia Tech Library266 4th Street NW, Atlanta, GA 30332
    404.894.4500
    • Emergency Information
    • Legal and Privacy Information
    • Human Trafficking Notice
    • Accessibility
    • Accountability
    • Accreditation
    • Employment
    © 2020 Georgia Institute of Technology