▎ 摘　　要

NOVELTY - Preparing cobalt-reduced graphene oxide catalyst involves: (1) taking concentrated sulfuric acid and sodium nitrate, stirring, adding natural flaky graphite powder, stirring, reacting, adding hydrogen peroxide, cooling, centrifuging, washing with deionized water, dispersing the obtained graphene oxide paste in deionized water, ultrasonically treating, aging, adding aqueous ammonia and hydrazine hydrate, refluxing, filtering, and freeze-drying to obtain reduced graphene oxide carrier; (2) adding cobalt(II) nitrate hexahydrate to a beaker, and dissolving with deionized water to obtain a salt solution; (3) adding the weighed reduced graphene oxide carrier to the beaker in step (2), and continuously stirring; (4) placing the sample obtained in step (3) in a vacuum drying oven, drying, and grinding; and (5) adding the powdered sample to a quartz tube, calcining, taking out the sample when the temperature drops to room temperature, and storing in a sealed container . USE - Preparing cobalt-reduced graphene oxide catalyst used in catalytic hydrogenation of guaiacol to produce cyclohexanol (all claimed). ADVANTAGE - The method provides cobalt-reduced graphene oxide catalyst, which uses cheap transition metal cobalt as the hydrogenation active component and reduced graphene oxide as the carrier, does not require high-temperature pre-reduction treatment, and can completely convert guaiacol in n-dodecane solution under the conditions of 1 MPa hydrogen pressure and 200degrees Celsius for 2 hours to obtain cyclohexanol with yield of 95%. The cobalt-reduced graphene oxide catalyst without reduction pretreatment has high catalytic activity and selectivity than nickel/reduced graphene oxide, iron/reduced graphene oxide, cobalt/aluminum oxide, Co/HY, cobalt/activated carbon catalyst, and is cheaper than noble metal catalyst such as platinum and palladium. DETAILED DESCRIPTION - Preparing cobalt-reduced graphene oxide catalyst involves: (1) taking 230 mL concentrated sulfuric acid and 5 g sodium nitrate, stirring, adding 10 g natural flaky graphite powder, stirring for 2.5 hours, adding 30 g potassium permanganate, reacting in a constant temperature water bath at 35degrees Celsius for 2 hours, adding 460 mL deionized water, stirring in an oil bath at 98degrees Celsius for 15 minutes, adding 1.4 L deionized water to terminate the reaction, adding 25 mL 30% hydrogen peroxide, cooling to room temperature, centrifuging, washing with deionized water until it is neutral, taking the above-prepared graphene oxide paste with a dry basis of 1 g, dispersing in 1000 mL deionized water, ultrasonically treating for 30 minutes, aging, adding 25 mL 30% aqueous ammonia and 6 mL 80% hydrazine hydrate, refluxing in oil bath at 95degrees Celsius for 3 hours, adding 4 mL 80% hydrazine hydrate to react for 30 minutes, adding 4% hydrochloric acid solution, filtering while hot, and freeze-drying to obtain reduced graphene oxide carrier; (2) adding cobalt(II) nitrate hexahydrate to a beaker, dissolving with deionized water to make a salt solution, then adding absolute ethanol, and uniformly shaking to obtain a salt solution; (3) weighing the reduced graphene oxide carrier prepared in step (1), adding to the beaker in step (2), continuously stirring with a glass rod, and leaving the sample still at room temperature; (4) placing the sample obtained in step (3) in a vacuum drying oven at 50degrees Celsius for 12 hours, and grinding with an agate mortar until the sample becomes powder; and (5) adding the powdered sample prepared in step (4) to a quartz tube, then placing in a tubular furnace under a nitrogen atmosphere with a temperature program of 10degrees Celsius/minute from room temperature to 500degrees Celsius, calcining at 500degrees Celsius for 1-4 hours, taking out the sample when the temperature drops to room temperature, and storing in a sealed container. An INDEPENDENT CLAIM is included for use of the cobalt-reduced graphene oxide catalyst in preparation of cyclohexanol by catalytic hydrogenation of guaiacol, which involves reacting guaiacol with hydrogen and n-dodecane as a solvent under the action of cobalt-reduced graphene oxide catalyst.