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In-situ Moessbauer spectroscopy measurements down to 4.2 K were performed on a 57Fe-doped Ni/C catalyst after various successive sulfidation treatments. After exposure of the catalysts to the H2S/H2 gas mixt. at room temp., part of the 57Fe becomes sulfidic. The rest is present as a sulfate-like intermediate species. The interaction between this intermediate species and the carbon support material is influenced by water. At
Ursula C. Dräger (Sun,) studied this question.