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An X-ray absorption spectroscopy study has been carried out on a sulfided Co/C and a Co-Mo/C catalyst, consisting of a fully sulfided Co-Mo-S phase. By comparing the EXAFS and XANES spectra of the catalysts with those of pure Co9S8 and CoS2 reference compounds, it is shown that the cobalt ions in the Co-Mo-S phase have an octahedral-like sulfur coordination while the cobalt ions in the Co/C catalyst have a larger fraction of octahedral cobalt than Co9S8.

The structure of the cobalt sulfide phase in carbon-supported Co and Co-Mo sulfide catalysts as studied by exafs and xanes