Journal Published Online: 30 July 2014
Volume 42, Issue 6

Direct Isoconversion Method for Nonisothermal Kinetic Analysis



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
Federal Aviation Administration, William J. Hughes Technical Center, Atlantic City International Airport, NJ, US
Pages: 10
Price: $25.00
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Stock #: JTE20140169
ISSN: 0090-3973
DOI: 10.1520/JTE20140169