The solid state kinetic approach has been successfully applied to various gas-solid reactions. Invariably such a kinetic expression contains a conversion function. In the absence of mass transfer or other interfacial limitations such a conversion function is representative of the microstructural development of the solid substrate as the reaction proceeds. In the past very little work has focused on determining this conversion function for the oxygen-graphite reaction. Remarkably the same may be said for the broader reaction of any generic carbon material with oxygen. This seems strange given the clear dependence of carbon reactivity on its microstructure and the development of this structure as oxidation takes place.
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