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| - Role of the Alloy and Spinel in the Catalytic Behavior ofFe−Co/Cobalt Magnetite Composites under CO and CO2Hydrogenation
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| - The aim of this work is to compare the reactivity and the transformation of the Fe−Co alloyon the one side and the Co-containing magnetite on the other side in Fe−Co/Co-containingmagnetite catalysts after CO/H2 and CO2/H2 reactions. Different Co-to-Fe ratios are studied. Thecatalysts undergo different modifications owing to their initial composition, but especially to thegas mixtures. X-ray diffraction (XRD) and high-resolution transmission electron microscopy(HRTEM) show that iron and cobalt carbides are formed in both cases: the iron carbides areformed first and are located on the particle surface while the cobalt carbides are formed in asecond step and localized in the center. The spinel lattice parameter keeps constant values inCO/H2, while it decreases in CO2/H2. Furthermore the CO/H2 reaction occurs without a preliminaryreduction unlike under CO2/H2 for which it is necessary. We propose that the carbides camepreferentially from the Fe−Co alloy under CO/H2 and from the spinel under CO2/H2. CO2formation during CO/H2 reactions could be related to the change of Fe−Co alloy and of the spinel.
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