Abstract
The effects of dispersed catalysts on coal liquefaction under hydrogen pressure were studied using small autoclaves. The catalysts were generated in situ by addition of elemental sulphur plus an oil-soluble carboxylic salt of either iron or molybdenum. Finely divided catalysts of relatively high activity were generated by this method. Residues isolated after liquefaction with added iron carboxylate and sulphur contained pyrrhotite, which is proposed to be the catalytically active species. The prime role of sulphur is to form pyrrhotite in combination with the iron. Addition of sulphur alone did not increase conversion. This method of catalyst preparation seems useful for further scientific study of the relationship between sulphur, metal sulphide catalysts and liquefaction activity.
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