Method for preparing cellulose and lignin oil by depolymerizing lignocellulose without exogenous hydrogen
Disclosed is a method for preparing cellulose and lignin oil by depolymerizing lignocellulose without exogenous hydrogen, including: performing reaction on the lignocellulose dispersed into an aqueous medium at 120° C. to 180° C. under the action of a catalyst; and separating a reaction product to obtain the cellulose and the lignin oil. The catalyst includes a carrier and an active ingredient loaded on the carrier, where the active ingredient is selected from one of platinum, palladium, ruthenium and nickel; the carrier is selected from one of a metal oxide, a metal composite material, silicon dioxide, nitrogen-doped carbon, molybdenum carbide and molybdenum nitride; and the metal oxide is selected from one of niobium oxide, tantalum oxide, tungsten oxide, zirconium oxide, aluminum oxide, titanium dioxide and molybdenum oxide.
1 . A method for preparing cellulose and lignin oil by depolymerizing lignocellulose without exogenous hydrogen, comprising:
reacting the lignocellulose dispersed into water at 120° C. to 180° C. under the action of a catalyst; wherein the weight ratio of the lignocellulose to the catalyst is 1:(0.01-0.2); and
separating a reaction product to obtain the cellulose and the lignin oil,
wherein the catalyst comprises a carrier and an active ingredient supported on the carrier; wherein in the catalyst, the mass fraction of the active ingredient in the total amount of the catalyst is 0.5% to 5%; wherein, through the synergistic effect of the active ingredient metal in the catalyst and the carrier, the hemicellulose undergoes highly selective aqueous-phase reforming to provide the hydrogen source;
wherein the active ingredient in the catalyst is platinum; and the carrier comprises at least one of a nickel aluminum composite material, a magnesium aluminum composite material, a zinc aluminum composite material, a cobalt aluminum composite material, and an iron aluminum composite material.
2 . The method according to claim 1 , wherein the lignocellulose comprises at least one of a woody plant and a herbaceous plant; the woody plant comprises at least one of birch, beech, poplar, camphorwood, oak, Nanmu, Schima superba, walnut, Chinese oak, ironwood, maple, teak, pine, Chinese fir and cedarwood; and the herbaceous plant comprises at least one of switchgrass, bamboo, wheat straw, rice straw and corn straw.
3 . The method according to claim 1 , wherein the lignocellulose comprises at least one of birch, poplar, pine, switchgrass and corn straw.
4 . The method according to claim 1 , wherein the active ingredient in the catalyst is the platinum, and the carrier comprises at least one of the magnesium aluminum composite material, the zinc aluminum composite material, the cobalt aluminum composite material and the nickel aluminum composite material.
5 . The method according to claim 4 , wherein the active ingredient in the catalyst is the platinum, and the carrier is selected from the nickel aluminum composite material and the magnesium aluminum composite material.
6 . The method according to claim 1 , the reaction temperature is 130° C. to 150° C.; and the reaction retention time is 2 to 30 hours.