▎ 摘　　要

NOVELTY - Method for preparing graphene-loaded palladium nano-particle composite catalyst, involves (i) taking graphene oxide aqueous solution, putting into palladium chloride solution, and soaking, (ii) drying the obtained mixed solution using spray-drying equipment and collecting graphene oxide powder containing palladium, (iii) subjecting the palladium-containing graphene oxide powder to high temperature reduction in a hydrogen atmosphere in a tube furnace, (iv) weighing palladium acetate, dissolving with 1:1 absolute ethanol and deionized water, weighing palladium-containing graphene powder and putting into the above solution, maintaining at 30-50 degrees C, and continuously stirring for 3-6 hours, (v) putting phenylboronic acid, bromobenzene, and cesium carbonate into a palladium-containing solution, raising the temperature to 80 degrees C, stirring to react for 1-4 hours, tracking the reaction situation by thin-layer chromatography, and cooling to room temperature. USE - The method is useful for preparing graphene-loaded palladium nano-particle composite catalyst. ADVANTAGE - The method is simple and has mild condition. The catalyst has high activity and can be reused many times. DETAILED DESCRIPTION - Method for preparing graphene-loaded palladium nano-particle composite catalyst, involves (i) taking carrier and palladium based on a mass ratio of (400-1000):1, taking graphene oxide aqueous solution, putting into a certain concentration of palladium chloride solution, and soaking for 24-48 hours, (ii) drying the obtained mixed solution using spray-drying equipment under atomization liquid flow rate of 3-8 ml/minute, atomization pressure of 0.1-0.5 MPa, inlet temperature of 170-190 degrees C, and hot air flow rate of 4-10 l/minute, and collecting graphene oxide powder containing palladium, (iii) subjecting the palladium-containing graphene oxide powder to high temperature reduction in a hydrogen atmosphere in a tube furnace, (iv) weighing palladium acetate, dissolving with 1:1 absolute ethanol and deionized water, weighing palladium-containing graphene powder and putting into the above solution, maintaining at 30-50 degrees C, and continuously stirring for 3-6 hours, (v) putting phenylboronic acid, bromobenzene, and cesium carbonate into a palladium-containing solution, where the molar ratios of palladium acetate, phenylboronic acid, bromobenzene, and cesium carbonate is 0.05:1:1.25:3 respectively, raising the temperature to 80 degrees C, stirring to react for 1-4 hours, tracking the reaction situation by thin-layer chromatography, and cooling to room temperature, where the catalyst comprises graphene carrier and palladium nanoparticles supported on the carrier, and the content of palladium is 1-2.5 wt.%.