Modelling of natural graphite oxidation using thermal analysis techniques

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Badenhorst, Heinrich
Rand, Brian
Focke, Walter Wilhelm

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Springer

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.

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Keywords

Natural graphite, Oxidation, Thermal analysis

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Citation

Badenhorst, H, Rand, B & Focke, WW 2010, 'Modelling of natural graphite oxidation using thermal analysis techniques', Journal of Thermal Analysis and Calorimetry, vol. 99, no. 1, pp. 211-228, doi: 10.1007/s10973-009-0095-3. [http://www.springerlink.com/content/102948/]