Catalysis 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 activity for asphaltene hydrogenating reaction so that high oil yield and high grade solvent having high hyodrogen donatability are obtained in the coal liquefaction system.
(2) It is inferred that oxidation of pulverized pyrite slows down the transformation rate to pyrrhotite which exhibits high catalytic activity on coal liquefaction reaction.
(3) Sulfur addition to pulverized and oxidized pyrite increases the catalytic activity for asphaltene cracking reaction, but it is not effective for asphaltene hydrogenating reaction . Sulfur addition is supposed to have different effect from pulverization for the catalytic activity of pyrite.
