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• W209267907 abstract "Structural changes of coprecipitated Fe/Mn-oxide catalysts during calcination, reduction and Fischer-Tropsch synthesis were investigated. After calcination at 500° C, the catalyst mass consisted of cubic Mn2O3 and α-Fe2O3 phases. Below 400°C Mn2O3 was formed as a tetragonal lattice and an α-Fe2O3 phase remained in a poorly crystalline state. The lattice parameter values indicated that both Mn2O3 and Fe2O3 phases had incorporated Fe3+ and Mn3+ ions, respectively, in their lattice and formed mixed lattices. However, X-ray diffraction patterns indicated that most of the iron oxide was present within the Mn2O3 lattice. Mn2-xFexO3 was reduced by hydrogen to MnO and elemental iron through the formation of MnFe2O4 and FeO as intermediate phases. Fe2-yMnyO3 (y < 0.1) reduced to metallic iron via Fe3-yMnyO4. Under conditions of Fischer-Tropsch synthesis the elemental iron of the catalytic mass was mostly transformed into MnFe2O4 and partly into Fe5C2 phase. Only minor amounts of elemental iron existed during FT synthesis. The amount of carbide phase in the used catalyst depended on the pretreatment process. Under the synthesis conditions presently used, formation of a spinel phase appeared to be more favourable, as compared to carburization. Transformation of tetragonal Mn2O3 into cubic Mn2O3 above 400°C during calcination seemed to improve the textural stability of the mixed oxides system. The presence of manganese oxide prevented the degradation of textural properties, both during reduction and synthesis." @default.
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• W209267907 date "1983-02-01" @default.
• W209267907 modified "2023-10-16" @default.
• W209267907 title "Iron/manganese oxide catalysts for fischer-tropsch synthesis" @default.
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• W209267907 doi "https://doi.org/10.1016/0166-9834(83)80129-8" @default.
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