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The purpose of this study was to obtain fine particles of iron sulfide from organic iron compounds. Catalysis of iron sulfide prepared was investigated on the liquefaction of Tanitoharum coal in 1-methylnaphthalene under hydrogen of 5MPa at 425℃. Iron sulfides (particle size: 1-1.5μm, surface area: 4-15m^2/g) could be prepared from Fe(CO)_5 and Fe(acac)_3. Catalytic activities of these iron sulfides were higher than that of pulverized natural pyrite.