Abstract
Activities of iron-sulfur as catalyst precusors in the liquefaction of various coal using syngas-water were investigated. Both synthetic pyrite and Fe(CO)_5/S were extremely effective. Especially, synthetic pyrite was the most excellent catalyst precusor for Wandoan coal to achieve the high oil yield (oil yield 48.7%, conversion 92.0%) in the two-step liquefaction (375℃, 60min+425℃, 60min).