Interaction between ozone and the chloride ion in sulfuric acid solutions up to 6-M concentration

The effect of sulfuric acid concentration on Cl2 evolution in the reaction between O3 and Cl− has been investigated. The catalytic effects of metal ions in this reaction have been studied as a function of solution acidity. The chlorine evolution rate increases markedly with increasing acid concentration. At acid concentrations below 4 mol/l, the most effective catalyst is Co2+. The catalytic activities of Fe3+ and Cu2+ peak at CH₂ SO₄ = 4.8 mol/l. In passing to highly acidic solutions ( CH₂ SO₄ > 5 mol/l), the catalytic activity of the metal ions decreases, but the chlorine evolution rate remains high owing to the high acidity. Kinetics of VO2+ oxidation with ozone in acid media have been studied, and the ozone solubility in aqueous sulfuric acid has been measured.