Abstract

The presence of manganese retards the reduction of iron in a variety of preparations of mixed iron—manganese oxide. A manganowustite intermediate is stabilized during the reduction of mixed oxides containing γ-FeMnO 3 or cubic FeMnO 3 in hydrogen or carbon monoxide. The temperature required for complete reduction depends on the preparation and pretreatment conditions. Reduction commences at lower temperatures in carbon monoxide than in hydrogen and, in addition, the reducibility of the coprecipitated mixed oxides calcined below 450°C is considerably enhanced. Iron carbides are not formed from γ-FeMnO 3 or cubic FeMnO 3 before the reduction of the manganowustite phase to metallic iron and MnO.

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