kinetics of the reduction of iron oxide by carbon monoxide mixed with carbon dioxide

Results are reported for the repeated reduction of iron oxide particles, 300-425 μm diameter, by a mixture of CO, CO₂, and N₂ in a fluidized bed of 20 mm internal diameter. The conclusions were as follows: (1) Reduction of either Fe₂O₃ to Fe₃O₄ or of Fe₃O₄ to Fe₀.₉₄₇O is first-order in CO. (2) With...

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Veröffentlicht in:AIChE journal 2010-04, Vol.56 (4), p.1016-1029
Hauptverfasser: Bohn, C.D, Cleeton, J.P, Müller, C.R, Davidson, J.F, Hayhurst, A.N, Scott, S.A, Dennis, J.S
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Sprache:eng
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Zusammenfassung:Results are reported for the repeated reduction of iron oxide particles, 300-425 μm diameter, by a mixture of CO, CO₂, and N₂ in a fluidized bed of 20 mm internal diameter. The conclusions were as follows: (1) Reduction of either Fe₂O₃ to Fe₃O₄ or of Fe₃O₄ to Fe₀.₉₄₇O is first-order in CO. (2) With the particle sizes used, the rates of the reduction reactions are controlled by intrinsic chemical kinetics. Activation energies and pre-exponential factors are reported. (3) The first cycle gave anomalous results, but (a) the rate of reduction of Fe₂O₃ to Fe₃O₄ remained constant over cycles 2-10; (b) the rate of reduction of Fe₃O₄ to Fe₀.₉₄₇O declined by 60-85% over cycles 2-10. (4) The rates of reduction declined with solids conversion down to zero at 80% conversion. The rates were incorporated into a conventional model of a fixed bed, which was used to predict, satisfactorily, the reduction behavior of iron oxide. © 2009 American Institute of Chemical Engineers AIChE J, 2010
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12084