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MICROEMULSION-MEDIATED SYNTHESIS OF NANOSIZE MOLYBDENUM SULFIDE COAL LIQUEFACTION CATALYSTS

In-situ electron microscopy studies of the dynamic behavior of certain metal sulfides supported on single crystal graphite showed that when such specimens were treated in 0.2 Torr hydrogen, pitting of the carbonaceous support at edges, steps and defect regions of the basal plane occurred. In the absence of a catalyst attack of graphite by molecular hydrogen was not observed until the temperature was raised to above1000"C. In contrast, when a metal sulfide was present gasification of the graphite took place at very low temperatures. We believe that this unusual behavior, which is quite different fo that observed in the presence of metal catalysts, is the result of attack by atomic hydrogen which is produced from the interaction of molecular hydrogen with the metal sulfide particles. These observations are consistent with those of other workers who have studied the interaction of microwave generated atomic hydrogen species with graphite.