Modelling of natural graphite oxidation using thermal analysis techniques

Heinrich Badenhorst, Brian Rand, Walter W. Focke

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A natural graphite recommended for use in nuclear applications was analyzed using thermogravimetric analysis. The oxidation behaviour was unlike that expected for flake-like particles. The dynamic data displayed an apparent bimodal reaction rate curve as a function of temperature and degree of conversion. Nevertheless, it was possible to model this behaviour with a single rate constant, i.e. without the need for a parallel reaction type of kinetic mechanism. The approach used in this paper tomodel the gas- solid reaction of graphite and oxygen, provides a consistent framework to test the validity of complementary isothermal and non-isothermal data for a specific solid state reaction.

    Original languageEnglish
    Pages (from-to)211-228
    Number of pages18
    JournalJournal of Thermal Analysis and Calorimetry
    Volume99
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2010

    Keywords

    • Natural graphite
    • Oxidation
    • Thermal analysis

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