▎ 摘　　要

NOVELTY - Method for synthesizing single-atom metal-nitrogen-doped graphene aggregate, involves (i) dissolving a chloride salt compound, dicyandiamide and glucose in deionized water to obtain a uniform solution, where the chloride salt is one of ferric chloride, copper chloride and nickel chloride, (ii) removing moisture by heating at 75 degrees C to obtain a self-assembled brown yellow powder, calcining the powder in a muffle furnace at 700-1000 degrees C and at a heating rate of 2 degrees C minute-1 for 2 hours under the protection of nitrogen, and obtaining a black fluffy solid, and (iii) grinding the solid into a black powder, which is a metal single-atom-nitrogen-doped graphene aggregate material. USE - The method is useful for synthesizing single-atom metal-nitrogen-doped graphene aggregate, which is useful as a catalyst in the production of 1,3-dihydroxyacetone by secondary hydroxyl oxidation of glycerol (all claimed). ADVANTAGE - The method constructs nitrogen-doped graphene three-dimensional (3D) aggregates, so that more single-molecule metal nanoparticles enter the graphene aggregate substrate, and utilizes the enhancement of the MottSchottky effect between single-atom metal/nitrogen-doped graphene 3D aggregates to enhance the catalytic activity of biomimetic enzymes, and the yield and selectivity of the product are significantly improved when the catalyst is used in the production of 1,3-dihydroxyacetone.