▎ 摘　　要

NOVELTY - A nitrogen-doped graphene-supported iron-based nanoparticle composite catalyst comprises nitrogen-doped graphene and iron-based nanoparticle supported on catalyst. The mass ratio of nitrogen-doped graphene and iron-based nanoparticle is 6:1-7:1. The content of nitrogen atom is 9.5-11.8%. USE - Nitrogen-doped graphene-supported iron-based nanoparticle composite catalyst. ADVANTAGE - The nitrogen-doped graphene-supported iron-based nanoparticle composite catalyst is prepared by simple process at low cost in industrial manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of nitrogen-doped graphene-supported iron-based nanoparticle composite catalyst, which involves (1) ultrasonically dispersing graphene oxide in deionized water to obtain 0.2-0.3 mg/ml aqueous solution of graphene oxide, placing graphene oxide aqueous solution in three-necked flask, adding reducing agent, magnetically stirring, placing in oil bath at 95 degrees C for 1 hour, and filtering solution to obtain reduced graphene oxide, (2) adding iron salt to aqueous dispersion of reduced graphene oxide, thoroughly mixing obtained solution, magnetically stirring for 6-12 hours, and freeze-drying at -62 degrees C to obtain reduced graphene oxide-iron salt aerogel precursor, and (3) heat treating reduced graphene oxide-iron salt aerogel precursor in mixed atmosphere of inert gas and ammonia gas at high temperature under low vacuum condition. The mass ratio of iron content and reduced graphene oxide is 1:8-1:10.