Catalytic activity of pyrite on coal liquefaction has been investigated with a 5 L batch-autoclave. The following conclusions are obtained.
(1) Pulverized pyrite exhibits high catalytic activiy because pulverization increases its outer surface area and its contact rate with reactants.
(2) Pulverization of pyrite also causes the crystal structure change which increases the number of active-site.
(3) It is inferred that catalytic activity of pyrite is related to chemical state of Fe and S on its surface.
