▎ 摘　　要

NOVELTY - Atomic-level active site catalyst is prepared by (a) adding concentrated sulfuric acid to a flask, adding aminoglycoside N(3)-acetyltransferase and graphite powder, oxidizing graphite oxide powder to obtained mixed solution (A), oxidizing the sulfuric acid-graphite interlayer compound to obtain mixed solution (B), adding deionized water and adding hydrogen peroxide solution into the hydrolyzed mixed solution to obtain a mixed solution (C), centrifuging to obtain a mixed solution (D), (b) placing pure reduced graphene oxide (RGO) carrier in a beaker, ultrasonically treating, adding a hydrochloric acid solution to obtain a mixed solution (E), growing molybdenum disulfide, centrifuging, washing and drying, and (c) placing molybdenum disulfide/RGO composite carrier in a beaker, ultrasonically treating to obtain a mixed solution (F), and centrifuging, and washing platinum- molybdenum disulfide/RGO catalyst with deionized water, and drying. USE - The atomic-level active site catalyst is used for catalyzing the synthesis of ammonia from nitrogen and hydrogen under mild conditions. ADVANTAGE - The composite carrier has excellent adsorption performance of MoS2 and excellent electrical conductivity of RGO, achieves atomic dispersion, improves the activity and stability of the synthetic ammonia reaction, enables the synthetic ammonia reaction to be driven under mild conditions, and reduces the energy consumption of the traditional synthetic ammonia industry. DETAILED DESCRIPTION - Atomic-level active site catalyst is prepared by (a) under ice water bath conditions of 0-4 degrees C, slowly adding 50-100 ml concentrated sulfuric acid with a mass fraction of 98% to a round bottom flask under stirring of a glass rod, followed by a slow addition of 1.00000-2.0000 g aminoglycoside N(3)-acetyltransferase (AAC3) and 1.00000-2.0000 g graphite powder to form a mixed solution, reducing the temperature of the mixed solution to 0-4 degrees C, slowly adding 6.0000-12.0000 g potassium permanganate three times, after adding potassium permanganate, subjecting the solution to constant temperature reaction in an ice water bath at 0-4 degrees C for 20-40 minutes, oxidizing graphite oxide powder to form a sulfuric acid-graphite interlayer compound, and recording the obtained mixed solution as a mixed solution (A), removing the ice water bath, raising the temperature of the mixed solution (A) to 20-25 degrees C, continuing to react for 1-3 hours, deeply oxidizing the sulfuric acid-graphite interlayer compound, and recording the obtained mixed solution as a mixed solution (B), adding 60-100 ml deionized water into the mixed solution (B), gradually raising the temperature of the mixed solution (B) to 96-100 degrees C by using the residual concentrated sulfuric acid and the water, and reacting for 0.3-0.7 hours under the stirring of the glass rod, so that the sulfuric acid-graphite interlayer compound in the mixed solution B undergoes a hydrolysis reaction, adding 50-25 ml hydrogen peroxide solution with a mass fraction of 10-30% into the hydrolyzed mixed solution, removing excess potassium permanganate, and recording the obtained solution as a mixed solution (C), transferring the mixed solution (C) to a high-speed centrifuge of 8000-12000 rpm for centrifugation for 10-40 minutes, pouring off the supernatant of the centrifuge tube, and the precipitate of the lower layer of the centrifuge tube is graphene oxide, moving the graphene oxide of the lower layer of the centrifuge tube into a beaker, sequentially adding 60-100 ml deionized water into beaker, 30-60 ml pure hydrazine hydrate, and uniformly stirring with glass rod to obtain a mixed solution (D), and reacting a mixed solution (D) in a vacuum drying oven at 100-140 degrees c for 8-10 hours to obtain an reduced graphene oxide (RGO) carrier, washing the RGO carrier three times using deionized water, removing residual hydrazine hydrate, putting into a vacuum drying oven again, drying at 100-140 degrees c for 1-3 hours to obtain a pure RGO carrier, (b) placing 0.0024-0.0048 g pure RGO carrier in a beaker, adding 60-100 ml deionized water, and ultrasonically treating the RGO by using an ultrasonic cleaner for 10-30 minutes to completely dissolve the pure RGO to obtain an RGO mixed solution, adding 0.0242 g sodium molybdate into the RGO solution and stirring uniformly by using a glass rod to obtain an RGO mixed solution dissolved with sodium molybdate, dissolving 0.0076-0.0380 g thiourea in 40-60 ml deionized water to obtain a thiourea solution, slowly dropping the thiourea solution into an RGO mixed solution dissolved with sodium molybdate by using a dropper, uniformly stirring with a glass rod, adding a hydrochloric acid solution with a mass fraction of 10%, and adjusting the pH value to be 0.1-7 to obtain a mixed solution (E), and transferring the mixed solution (E) into a stainless steel reaction vessel lined with a polytetrafluoroethylene liner, growing molybdenum disulfide (MoS2) under the condition of 100-250 degrees C, growing for 18-30 hours, centrifuging for 10-40 minutes in a high-speed centrifuge with 8000-12000 rpm, pouring out the supernatant of the centrifuge tube, washing the lower-layer precipitate of the centrifuge tube into molybdenum disulfide/RGO, washing the molybdenum disulfide/RGO product with deionized water for three times, and drying in a vacuum drying oven at 100-140 degrees C for 1-3 hours to obtain the molybdenum disulfide/RGO composite carrier, and (c) placing 0.0200-0.0800 g molybdenum disulfide/RGO composite carrier in a beaker, adding 60-100 ml deionized water, and ultrasonically treating by using an ultrasonic cleaner for 10-30 minutes to completely dissolve the molybdenum disulfide/RGO to obtain a mixed solution (F), adding 0.0020-0.0100 g hydrogen peroxide and hexahydrate to 60-100 ml mixed solution (F) and stirring evenly, dripping 60-100 ml 0.5 mol/l sodium borohydride solution at 20-25 degrees C, dripping the solution, stirring uniformly using a glass rod, and transferring the reaction mixture to 8000-12000 rpm in a high-speed centrifuge for centrifugation for 10-40 minutes, and pouring out the supernatant of the centrifuge tube, and washing platinum-molybdenum disulfide/RGO catalyst three times with deionized water and 10-30% absolute ethanol, and placing in a vacuum drying oven at 160-240 degrees C for 2-5 hours to obtain pure platinum-molybdenum disulfide/RGO catalyst.