接触点数の導入による一方拡散系粉体間反応速度の評価

抄録

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.