Abstract
A laboratory study of the aqueous oxidation of SO2 in the presence of Fe(III) and Fe(II) has been conducted. The SO2 concentration was 3930 ppm (3.93 × 10−3 atm or 398 Pa) in a gas stream with nitrogen and oxygen. The oxygen pressure was varied from 0 to 0.203 atmosphere. The initial concentration of Fe(III) ranged from 10−3 to 5-10−3 molar while that of Fe(II) was 5 × 10−3 molar. The temperatures were 298, 309.2, and 317.5 K. The solution pH was 1.83. The oxidation of SO2 is intensive and yields from 90 to 97 pct recovery of incoming SO2 when 5 × 10−3 molar Fe(III) and an oxygen pressure above 0.057 atmosphere are applied at 298 K. The reaction mechanism has been explained by determining the rate constants of the oxidation reactions from a kinetic model. The rate constants show that SO2 is mostly oxidized by oxygen through formation of ferric-sulfite complex and that regeneration of ferric ion is possible under a normal oxygen pressure. The activation energy of the oxidation has been determined and has been found to be 13.5 Kcal/mole.
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Cho, E.H. Removal of SO2 with oxygen in the presence of Fe(III). Metall Trans B 17, 745–753 (1986). https://doi.org/10.1007/BF02657136
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DOI: https://doi.org/10.1007/BF02657136