The Oxidation of Fe(II) in Acidic Sulfate Solutions with Air at Elevated Pressures: Part 2. Influence of H2SO4 and Fe(III)

Wermink, W. N. & Versteeg, G. F., 12-Apr-2017, In : Industrial and Engineering Chemistry Research. 56, 14, p. 3789-3796 8 p.

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  • The Oxidation of Fe(II) in Acidic Sulfate Solutions with Air at Elevated Pressures. Part 2. In fl uence of H 2 SO 4 and Fe(III)

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The oxidation of ferrous ions in acidic sulfate solutions at elevated air pressures was investigated. The effect of the Fe2+ concentration, Fe3+ concentration H2SO4 concentration, and partial oxygen pressure on the reaction rate were determined at three different temperatures, that is, T = 90, 70, and 50 degrees C. A second order of reaction in Fe2+ and a first order of reaction in O-2 were determined, respectively. A slight inhibition by Fe3+ on the Fe2+ oxidation reaction was observed. The reaction is first order in Fe3+ in the kinetic term for the inhibition by Fe3+. Concentrations of H2SO4 up to 1 M result in a fractional negative order of -0.6; concentrations Of H2SO4 above 1 M result in a zero order. One kinetic equation for the oxidation of Fe2+ was postulated, in which the order of reaction in H2SO4 is changed depending on the H2SO4 concentration. R-FE(2+) = -d[Fe2+]/dt = k[Fe2+]P-2(O2)[H2SO4](c)/(1 + A[Fe3+), with c = -0.6 for [H2SO4] <1 M, and c = 0 for [H2SO4] > 1 M. The activation energy was determined to be E-A = 62.1 kJ/mol. The order c in H2SO4 is either -0.6 or zero, depending on the H2SO4 concentration.

Original languageEnglish
Pages (from-to)3789-3796
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Issue number14
Publication statusPublished - 12-Apr-2017



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