Premium
The kinetics of the reduction of iron oxide by carbon monoxide mixed with carbon dioxide
Author(s) -
Bohn C. D.,
Cleeton J. P.,
Müller C. R.,
Davidson J. F.,
Hayhurst A. N.,
Scott S. A.,
Dennis J. S.
Publication year - 2010
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12084
Subject(s) - carbon monoxide , chemistry , iron oxide , kinetics , oxide , reaction rate constant , carbon dioxide , carbon fibers , reaction rate , analytical chemistry (journal) , inorganic chemistry , materials science , catalysis , chromatography , organic chemistry , composite material , physics , quantum mechanics , composite number
Results are reported for the repeated reduction of iron oxide particles, 300–425 μm diameter, by a mixture of CO, CO 2 , and N 2 in a fluidized bed of 20 mm internal diameter. The conclusions were as follows: (1) Reduction of either Fe 2 O 3 to Fe 3 O 4 or of Fe 3 O 4 to Fe 0.947 O 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 Fe 2 O 3 to Fe 3 O 4 remained constant over cycles 2–10; (b) the rate of reduction of Fe 3 O 4 to Fe 0.947 O 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