▎ 摘　　要

NOVELTY - A nano-gold catalyst is sandwich structure comprising inner core graphene oxide, middle layer nano-gold particle and shell metal-organic framework. USE - Nano-gold catalyst used for automobile exhaust gas treatment, sewage treatment and energy conversion and methane reforming reaction field. ADVANTAGE - The catalyst has high catalytic activity and stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of nano-gold catalyst comprising configuring graphene oxide aqueous solution, adding 10-50 wt.% gold source solution, stirring for 10-30 minutes, adjusting pH value using 2-5 wt.% inorganic alkali aqueous solution to 8-12, heating to 70-100 degrees C, stirring and reacting for 1-5 hours, centrifugally separating, washing precipitate with deionized water for 200-500 times, vacuum drying at 60-90 degrees C for 6-12 hours to obtain graphene oxide/gold compound, adding in N,N-dimethylformamide, ultrasonically dispersing for 10-30 minutes, adding organic ligand, ultrasonically dispersing for 10-30 minutes to obtain mixed solution A, mixing zinc source and N,N-dimethylformamide at mass ratio of 0.1:1-0.5:1 to prepare mixed solution B, mixing mixed solutions A and B, ultrasonically dispersing for 0.5-2 hours, stirring for 10-15 hours, centrifugally separating, washing precipitate with deionized water for 200-500 times, and vacuum drying at 60-80 degrees C for 8-12 hours. The mass ratio of graphene oxide and deionized water is 0.005:1-0.02:1. The mass ratio of gold source solution and graphene oxide is 1:1-10:1. The mass ratio of N,N-dimethylformamide and graphene oxide/gold compound is 100:1-200:1. The mass ratio of organic ligand and graphene oxide/gold compound is 5:1-10:1. The mass ratio of mixed solution A and mixed solution B is 5:1-1:1.