HF/BF_3 was found to depolymerize and desulphurize high sulphur coal in the presence of hydrocarbon without gaseous hydrogen at milder reaction conditions of 150-200℃ for 3h under autogeneous pressure of 3-8MPa. And characterization of sulphur forms in the treated coals were carried out by XPS in order to clear the residual sulphur forms and sulphur behavior in this acid-catalyzed depolymerization reaction.
