SO3H-functionalized acidic ionic liquids as catalysts for the hydrolysis of cellulose

► Six kinds of acidic ionic liquids were used to promote the hydrolysis of cellulose. ► The main factors influencing the hydrolysis of cellulose were investigated. ► Acidic ionic liquids with analogous structures showed similar catalytic activities. ► The water in solvent [BMIM]Cl had negative effect on the TRS yield.