Abstract
The Mössbauer effect has been used to study, under liquefaction conditions, the effect of additives (S, FeS 2, Fe 7S 8 and Fe) on the transformation of pyrite in fresh Blacksville No. 2 coal. It was observed that the addition of iron sulphides enhanced the conversion of the inherent pyrite in coal, an effect attributed to a combined cracking activity of the pyrrhotites and H 2S on the less reactive organic covering of some of the inherent coal pyrite. The addition of sulphur produced a higher partial pressure of H 2S; total conversion of pyrite to pyrrhotite was not observed. The stoichiometry of the pyrrhotites present in the residue of the experiment with sulphur showed a smaller atomic percentage of iron than in the experiment without additives, this change in stoichiometry being attributed to the higher partial pressure of H 2S in the reactor. When metallic iron was added, the partial pressure of H 2S in the reactor decreased (iron acts as a scavenger) and troilite was also formed.
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