Hydroliquefaction behavior of α-cellulose, leonardite, four lignites, and two subbituminous coals suspended in an anthracene oil carrier has been investigated in the presence of Co-Mo/Al2O3catalyst at 425°C and at an average pressure of 1,300 psig in a batch reactor for 30-min reaction time. Both total conversion of moisture-ash free solids and total yield of liquid products were greater for all but one of the lignites than for the subbituminous coals. Partial demineralization by HCl washing decreased both the total conversion of and pentane-soluble oil yield from lignites. It had relatively little effect on subbituminous coals. Although cellulose was almost completely converted to liquids and gases, no pentane-soluble oils were produced.