Abstract
The kinetic model which follows the surface dissociation of Co3O4 on γ-Al2O3 and SiO2 modified with alkaline earth cations has been investigated using the Arrhenius kinetic law as an approximate criterion. It was found that on both classes of modified carriers a “phase boundary reaction control” mechanism fits the experimental points. Using this model, the activation energies were calculated. The modification of γ-Al2O3 brings about a decrease of Ea values whereas that of SiO2 causes an increase in activation energy. These effects, in conjunction with the “initial values” of the Co3O4 concentration, explain the influence of alkaline earth cations on the Co3O4/γ-Al2O3 and Co3O4/SiO2 catalytic systems and support the tentative mechanism proposed earlier.
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