Hydrogenolysis reactions of mixture of coal liquid and coal liquefaction residue were carried out using red mud-sulfur or Co-Mo/Al_2O_3 catalyst. The effect of deashing treatment of coal liquefaction residue were also investigated. Notable synergistic effects such as the increase of n-hexane soluble and the decrease of dichloromethane insoluble were observed only the hydrogenolysis of basic fraction of coal liquid and nondeashed coal liquefaction residue using red mud-sulfur catalyst.
