Abstract
The temperature dependence of the oxidation kinetics of Fe2+ by O3 at pH 0–3 was studied by stopped-flow technique in the temperature range 5–40°C. Activation parameters of the reactions involved in formation and decay of the ferryl ion (iron(IV)), FeO2+ are determined. The reaction of Fe2+ + FeO2+ was found to branch into two channels forming iron(III)-dimer, Fe(OH)2Fe4+, and Fe3+. The yield of the dimer, Fe(OH)2Fe4+, increases with temperature on the expense of the Fe3+ yield. On the basis of the overall rate constant and relative yield of Fe(OH)2Fe4+ the activation energy is determined for both channels. The activation parameters of the hydrolysis of the ferryl ion and its reaction with H2O2 were also determined. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 17–24, 1997.
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