▎ 摘　　要

NOVELTY - Preparing size-controllable gold-carbon highly selective oxidation catalyst, comprises mixing chloroauric acid aqueous solution with molar concentration of 10-4 to 10-2 mol/l and 0.5-4.5 mol/l protective agent solution to obtain mixed solution, adding reducing agent into the mixed solution, controlling the stirring speed of 500-1200 revolutions/minute, stirring for 10-60 minutes to form stable gold sol solution (composed of uniform spherical particles with size of 2-20 nm) as gold precursor, adding activated carbon, carbon nanotube, graphene oxide, and/or carbon nanofiber as carrier into stable gold sol solution during solid loading process, then loading 0.5-5 wt.% metal, continuously stirring at 20-90 degrees C for 1-16 hours until color of supernatant turns to transparent and colorless, washing sample, filtering with distilled water until pH is 7, drying overnight at 60 degrees C, grinding into powder, and calcining powder in oxygen atmosphere at 250-500 degrees C for 3 hours to obtain final product. USE - The method is useful for preparing size-controllable gold-carbon highly selective oxidation catalyst. ADVANTAGE - The method: reaches conversion rate of benzyl alcohol to benzaldehyde of 87%, and selectivity of benzaldehyde of more than 83%; and has high selectivity of oxidative coupling of benzylamine to imine of 99%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing gold-carbon catalyst powder for highly selective catalytic oxidation reaction, comprising mixing gold-carbon highly selective oxidation catalyst, benzyl alcohol, sodium hydroxide and p-xylene under the condition of oxygen circulation or connection of oxygen balloon, controlling the temperature at 40-90 degrees C, reacting for 1-10 hours under normal pressure, where the mass ratio between gold-carbon highly selective oxidation catalyst, benzyl alcohol, p-xylene and sodium hydroxide is 0.001-0.05:0.01-0.6:1-20:0.01-0.2.