Abstract
The isothermal reaction between a gas and a porous solid was studied theoretically. The conversion-time relationship for the solid is calculated for an irreversible, first-order reaction with respect to the gaseous reactant and taking into account the diffusional resistances of the gas film and the ash layer. This calculation is performed assuming the gaseous reactant is consumed inside the porous solid, but taking into account the way in which this consumption affects the porosity and hence the available surface area and the effective diffusivity. The effectiveness factor used in such a calculation is also developed in this paper and is expressed as a correction factor to the Thiele modulus.
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