On a New Mode of Catalytic Oxidation of Sulfite in the Presence of Mn(II) in Excess of Metal Ions

Abstract

The paper considers data on the kinetics of catalysis by manganese(II) ions of sulfite oxidation in excess of metal ions. Along with experiments in solutions, information on the dynamics of the reaction in aerosol particles was also involved. For the first time, a fast degenerate-branched (D-B) reaction mode was revealed. Its dynamics is determined by the rate of branching of the chain with the participation of the intermediate \({\text{HSO}}_{5}^{ - }\) and Mn(II) ions. Estimates of the rate constant of this reaction are given in the paper, and the criterion for the transition of the reaction to the D-B mode is considered. It is shown that the observed acceleration of the formation of sulfates in the D-B regime in experiments with aerosol is the result of the coupling of the catalytic reaction and the capture of SO2 from the gas. Calculations within this framework of reaction dynamics find agreement with the data of experiments in smog chambers, as well as with the results of atmospheric aerosol monitoring