The kinetics of the reduction of iron oxide by carbon monoxide mixed with carbon dioxide |
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| Authors: | C D Bohn J P Cleeton C R Müller J F Davidson A N Hayhurst S A Scott J S Dennis |
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| Affiliation: | 1. Dept of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K;2. Dept of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K |
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| Abstract: | 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 |
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| Keywords: | reaction kinetics iron oxide reduction hydrogen production fluidized bed |
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