Abstract
THE Fischer–Tropsch reaction, involving the hydrogenation of CO to form hydrocarbons and their oxygenated derivatives, is a catalytic process of considerable industrial importance. We have recently1 studied the process using cobalt/manganese oxide catalysts, and have investigated the nature of the working catalysts under realistic synthesis conditions. Here we report on in situ X-ray diffraction studies of the bulk structure of the catalyst during reduction with hydrogen and subsequent hydrogenation of CO. We identify the formation of a body-centred cubic (b.c.c.) phase of metallic cobalt during the process. This phase, unknown until recently and never before prepared in bulk, is metastable; it reverts to the stable face-centred cubic structure after exposure to air and slight pressure at room temperature. The body-centred cubic structure may have a significant influence on the hydrocarbon selectivities of cobalt-containing catalysts.
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Colley, S., Copperthwaite, R., Hutchings, G. et al. Identification of body-centred cubic cobalt and its importance in CO hydrogenation. Nature 339, 129–130 (1989). https://doi.org/10.1038/339129a0
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DOI: https://doi.org/10.1038/339129a0
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