Abstract
The kinetics of aqueous sulphur dioxide autoxidation catalyzed simultaneously by ions of two different transition metals was studied. Basing on the mechanism of a chain reaction the rate equation for oxygen consumption has been derived. Interaction of the ions in redox steps was assumed. The equation was tested against experimental data collected during oxygen absorption performed in a gas-liquid reactor with a plane interface. Two catalytic systems were used in the experiments: CoSO4-Fe2(SO4)3 and CoSO4-MnSO4 The predicted occurrence of a minimum value of oxygen absorption rate at a certain concentration ratio of metal ions constituting a mixed catalyst was confirmed for both systems. Other phenomena related to the possible removal of a catalyst or sulphite from the place of reaction were also discussed.
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