▎ 摘　　要

NOVELTY - The preparation method of nitrogen-doped graphene-loaded metal single atom catalyst involves adding nitrogen-containing organic compound disodium edetate and metal salt into water, mixing to prepare aqueous solution, and performing ion exchange reaction to obtain stable complex, evaporating, and drying to obtain complex solid powder, mixing complex solid powder and alkali metal salt, heat-treating, and cooling to obtain nitrogen-doped graphene-loaded metal single atom catalyst and alkali metal salt mixture, passing the mixture through acidic aqueous solution, washing, and drying. USE - Preparation method of nitrogen-doped graphene-loaded metal single atom catalyst (claimed). ADVANTAGE - The method enables preparation of nitrogen-doped graphene-loaded metal single atom catalyst with excellent thermal stability, by simple, safe, economical, and industrial process. DETAILED DESCRIPTION - The preparation method of nitrogen-doped graphene-loaded metal single atom catalyst involves (1) adding nitrogen-containing organic compound disodium edetate and metal salt into deionized water, where the mass ratio of disodium edetate and metal salt is 100:1-1000:1, uniformly mixing to prepare aqueous solution with concentration of 0.001-0.5 mol/l, and performing ion exchange reaction at 40-120 degrees C for 0.5-6 hours to obtain stable complex, evaporating, and drying to obtain complex solid powder, (2) adding the complex solid powder obtained in the step (1) to alkali metal salt, uniformly mixing, where the mass ratio of complex solid powder and alkali metal salt is 1:5-1:20, placing into a tubular furnace, heat-treating at 800-1200 degrees C for 0.5-3 hours under protection of inert atmosphere, and naturally cooling to room temperature to obtain nitrogen-doped graphene-loaded metal single atom catalyst and alkali metal salt mixture, and (3) passing the mixture obtained in the step (2) through acidic aqueous solution, washing with pure water and anhydrous ethanol, and drying.