Abstract
Kinetic studies have been carried out on the hydrogen reduction of pure α-Fe 2O 3 doped with foreign metal oxides employing a sensitive micro-gravimetric technique. The results show that the reduction of pure Fe 2O 3 proceeds by a consecutive two-step mechanism via Fe 3O 4, the overall rate being controlled by the topochemical reduction of Fe 3O 4 while that of doped oxides and hematite ore takes place by a different mechanism involving the mixed ferrite formed. In addition, the reduction of pure Fe 2O 3 is catalysed by metal additives in the presence of water vapour. This enhancement in reduction rate is attributed to a “hydrogen spill-over” effect.
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