Characterization of liquefied products from corn stalk and its biomass components by polyhydric alcohols with phosphoric acid.

•The cellulose, hemicellulose and lignin were directly separated from corn stalk.•The main components and structure of bio-oil were detected by GC–MS, NMR and FTIR.•The carbon number of each component in bio-oil was analyzed by TGA.•Corn stalk degradation process was studied by liquefaction of its components.