Oxidation kinetics of ferrous sulfate over active carbon
- Aabo Akademi (Finland). Lab. of Industrial Chemistry
- Lappeenranta Univ. of Technology (Finland). Dept. of Chemical Engineering
- Kemira Oy, Oulu (Finland)
Catalyzed oxidation kinetics of dissolved Fe{sup 2+} ions to Fe{sup 3+} over active carbon in concentrated H{sub 2}SO{sub 4}-FeSO{sub 4} solutions was studied with isothermal and isobaric experiments carried out in a laboratory-scale pressurized autoclave. The experiments were performed at temperatures between 60 and 130 C, and the pressure of oxygen (O{sub 2}) was varied between 4 and 10 bar. The kinetic results revealed that the oxidation rate was enhanced by increasing the temperature and pressure and that the catalytic and noncatalytic oxidations proceed as parallel processes. A rate equation was obtained for the catalytic oxidation process, based on the assumption that the oxidation of Fe{sup 2+} with adsorbed oxygen is rate determining. The total oxidation rate was simulated by including a previously determined rate equation for the noncatalytic oxidation into the global model, from which the kinetic parameters of the catalytic oxidation rate were determined. A comparison of the model fit with the experimental data revealed that the proposed rate equation is applicable for the prediction of the Fe{sup 2+} oxidation kinetics in acidic ferrous sulfate solutions.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 680076
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 38, Issue 7; Other Information: PBD: Jul 1999
- Country of Publication:
- United States
- Language:
- English
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