Abstract
Gas-solid reactions find importance in numerous processes including conventional ones, involving gasification and ore reduction, as well as newer ones related to ceramics and VLSI production. The mathematical modelling of gas solid reactions is therefore a subject of long standing interest now receiving renewed attention. This review presents the various mathematical models in terms of a unified framework that accommodates shrinking core reactions as well as the internal reaction-diffusion formulation with an arbitrary structural model. In the former case the effect of the narrow internal reaction-diffusion zone that always accompanies the shrinking front is discussed. The error associated with the neglect of this zone is not necessarily negligible under conditions of surface reaction or product layer diffusion control.
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