Abstract
In order to estimate the interparticle reaction rate, an examination of kinetic models was undertaken for three typical uni-directional diffusion systems, Fe2O3-V2O5, Al2O3-CuO and Al2O3-ZnO. Hao-Tanaka's concentric spherical model is found to be valid for these systems based on the difference in the dependence of the reaction rate upon the particle radius, the radius ratio and the molar ratio in the samples. This can be regarded as a generalized model which enables us to the evaluate interparticle reaction rate.In conventional spherical shell models, the Ginstling-Brounshtein's model is sound in material balance, but with it we are unable to assess the interparticle reaction rate, since the contact points between the particles are not taken into account. Jander's model is most commonly used to represent the reaction rate, however it cannot be used to estimate the value due to serious irrationality in the material balance.
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