Abstract
The irreversible, γ order reaction between a gas and a spherical porous solid is analyzed under isothermal and nonisothermal conditions. Effective diffusivity and surface area profiles inside the reactant solid are taken into account. An analytic solution for the rate of variation of solid size is obtained provided the gaseous reactant is consumed completely inside the porous solid. The moving boundary model arises as a particular case of the general solution obtained.
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