▎ 摘　　要

NOVELTY - Preparing 2,5-hexanedione by catalytic hydrogenation of lignocellulose comprises taking microcrystalline cellulose as raw material, liquid acid aqueous solution as solvent, graphene carbon nanotube/carbon shell wrapped metal catalyst as catalyst, adding the catalyst, raw material and solvent to the reaction vessel, and using the hydrogenation reaction to prepare 2,5-hexanedione, where the reaction temperature is 180-260degrees Celsius, and the reaction time is 0.5-6 hours. The preparation method of graphene carbon nanotube/carbon shell wrapping metal catalyst comprises mixing metal salts, organics and deionized water, raising the temperature to 100-160degrees Celsius for drying after uniformly stirring at 60-90degrees Celsius, and obtaining the target catalyst by roasting under the protection of nitrogen atmosphere for 1-6 hours, where the organic acid is glucose, succinic acid, tartaric acid, malic acid, ascorbic acid, citric acid, oxalic acid, benzoic acid, salicylic acid, caffeic acid or phenylalanine. USE - The method is useful for preparing 2,5-hexanedione by catalytic hydrogenation of lignocellulose. ADVANTAGE - The method: utilizes the metal wrapped by graphene carbon nanotube/carbon shell layer as catalyst; achieves efficient conversion of cellulose to 2,5 hexanedione chemical; has simple catalyst preparation method; is economical; and has excellent catalytic activity, excellent catalyst stability, high efficiency, and large-scale popularization and application. DETAILED DESCRIPTION - Preparing 2,5-hexanedione by catalytic hydrogenation of lignocellulose comprises taking microcrystalline cellulose as raw material, liquid acid aqueous solution as solvent, graphene carbon nanotube/carbon shell wrapped metal catalyst as catalyst, adding the catalyst, raw material and solvent to the reaction vessel, where the hydrogen pressure in the reaction vessel is 1-6 MPa, and using the hydrogenation reaction to prepare 2,5-hexanedione, where the reaction temperature is 180-260degrees Celsius, and the reaction time is 0.5-6 hours. The preparation method of the graphene carbon nanotube/carbon shell wrapping metal catalyst comprises mixing metal salts, organics and deionized water, raising the temperature to 100-160degrees Celsius for drying after uniformly stirring at 60-90degrees Celsius, where the obtained powder is at 550-900degrees Celsius, and obtaining the target catalyst by roasting under the protection of nitrogen atmosphere for 1-6 hours, where the molar ratio of the metal salt and the organic matter is 0.1-10:1, the metal ion of the metal salt is transition metals of VIIIB and/or IB groups, the organic matter is mixture of nitrogen source and organic acid, the molar ratio of nitrogen source and organic acid is 0.1-10:1, the nitrogen source is urea, dicyandiamide, melamine, pyridine, pyrrole and imidazole, the organic acid is glucose, succinic acid, tartaric acid, malic acid, ascorbic acid, citric acid, oxalic acid, benzoic acid, salicylic acid, caffeic acid or phenylalanine.