▎ 摘　　要

NOVELTY - Platinum catalyst supported on aminated graphene comprises a carrier comprising aminated graphene, and an active component comprising 0.1-3 %mass platinum. USE - The catalyst is used for catalyzing hydrogenation of nitrobenzene to prepare p-aminodiphenylamine (claimed). ADVANTAGE - The method solves the problems that the reduction catalyst in the existing production of p-aminodiphenylamine cannot remove the reaction heat in time, resulting in partial overheating, sintering inactivation of the catalyst, large loss of the catalyst, many impurities in the hydrogenation solution, and reduced production capacity. The catalyst catalyzes the hydrogenation of nitrobenzene to prepare p-aminodiphenylamine with high activity, high selectivity and excellent stability and has long service life, and has excellent application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the catalyst, involving (i) soaking the natural flake graphite in an inorganic acid solution, boiling and refluxing, performing solid-liquid separation, and washing the solid phase with water, where the obtained solid phase is pretreated natural flake graphite, (ii) adding the pretreated natural flake graphite to concentrated sulfuric acid, thoroughly stirring and mixing, adding potassium permanganate to the mixed solution for reaction, adding deionized water for reaction, and adding hydrogen peroxide solution for reaction to obtain graphite oxide solution, (iii) ultrasonically peeling off the graphite oxide solution, filtering, washing the solid phase with deionized water until the filtrate is neutral, and drying the solid phase to obtain graphene oxide, (iv) ultrasonically dispersing graphene oxide in ethylene glycol and ethylenediamine solution to react to obtain aminated graphene, and (v) adding the platinum salt solution to the aminated graphene to impregnate, reducing, washing, and drying to prepare a platinum catalyst supported on aminated graphene.