▎ 摘　　要

NOVELTY - Preparing nitrogen-doped graphene catalyst comprises adding concentrated sulfuric acid in a beaker, adding crystalline graphite powder to the beaker, uniformly mixing and then stirring the mixture, adding potassium permanganate to the mixture, transferring the beaker into a water bath, adding distilled water to the mixture, adding diluted distilled water to the mixture, cooling, adding hydrogen peroxide, centrifuging the mixture and then washing, adding ethanol, entering into a gas chromatography, performing liquid phase reaction, and stirring. USE - The method is useful for preparing nitrogen-doped graphene catalyst, which is useful for decomposing ethanol to aldehyde (claimed). ADVANTAGE - The method simply and easily prepares nitrogen-doped graphene catalyst with high yield of 100% under mild operation conditions and reduced environmental pollution, cost and energy consumption. DETAILED DESCRIPTION - Preparing nitrogen-doped graphene catalyst comprises adding concentrated sulfuric acid in a beaker under ice-cooling and stirring conditions, adding crystalline graphite powder to the beaker, uniformly mixing and then stirring the mixture, maintaining the ice bath temperature, adding a small amount of potassium permanganate to the mixture, reacting the mixture, maintaining the temperature at 5 degrees C for 2 hours, finishing reaction, transferring the beaker into a medium-temperature water bath, gradually turning the mixture color into dark green color, adding distilled water to the mixture, moving the beaker to high temperature oil bath and then reacting, finishing reaction, adding diluted distilled water to the mixture, cooling the mixture at room temperature, adding hydrogen peroxide to the mixture, gradually turning the mixture color into bright yellow, centrifuging the mixture and then washing, placing the mixture in a vacuum drying tank and then drying to obtain oxidized graphite, weighing oxidized graphite and urea, uniformly mixing, placing the mixture into a tube resistance furnace under inert gas protection atmosphere, reacting the mixture for 6 hours, raising the temperature t0 800 degrees C, naturally cooling at room temperature to obtain nitrogen-doped graphene, placing the nitrogen-doped graphene into a reactor under inert gas protection atmosphere, continuously adding ethanol to the reactor, cooling the mixture using n-butanol under quantitative absorption conditions, adding gas products and liquid products to the mixture, entering into a gas chromatography, detecting hydrogen, performing liquid phase reaction, detecting unreacted ethanol, and stirring.