Volume 42, Issue 6 (November 2014)

    Direct Isoconversion Method for Nonisothermal Kinetic Analysis

    (Received 14 April 2014; accepted 2 July 2014)

    Published Online: 2014

    CODEN: JTEOAD

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    Abstract

    An accurate, semi-analytic solution of the Arrhenius temperature integral is the basis for an isoconversion method to extract kinetic parameters of single-step reactions from multiple heating rate experiments in a single iteration. The isoconversion method can be expressed as a finite difference (FD) formula identical in form and function to Kissinger’s maximum reaction rate equation or can be differentiated to yield an analytic derivative (AD) formula similar to Ozawa’s equation. The FD and AD isoconversion formulae provide identical, model-free activation energies by direct calculation when applied to differential thermal analysis data without the need for recursion as in some standard test methods. A model-dependent frequency factor can be obtained from the FD formula.


    Author Information:

    Lyon, Richard E.
    Federal Aviation Administration, William J. Hughes Technical Center, Atlantic City International Airport, NJ


    Stock #: JTE20140169

    ISSN: 0090-3973

    DOI: 10.1520/JTE20140169

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    Author
    Title Direct Isoconversion Method for Nonisothermal Kinetic Analysis
    Symposium , 0000-00-00
    Committee D20