Graphene modified iron-based catalyst and preparation and application thereof for use in Fischer-Tropsch reaction

A method for preparing a graphene modified iron-based catalyst, wherein raw materials comprise 0.01-30 parts by mass of graphene, 0-20 parts by mass of promoter and 60-99.99 parts by mass of iron oxide,

• the method comprising the following steps:
• (1) dispersing the graphene in an aqueous solution at 10-80° C. to form a suspension, ultrasonically dispersing for 0.5-5 h, and then stirring for 1-24 h;
• (2) adding the iron oxide into the suspension formed in the step (1) according to a stoichiometric ratio, and continuously stirring for 0.5-24 h;
• (3) adding a precursor of the promoter into the suspension formed in the step (2) according to a stoichiometric ratio, and continuously stirring for 1-24 h;
• and
• (4) conducting rotary evaporation on a solution obtained in the step (3) to dryness, drying an obtained solid at 80-120° C. for 1-24 h, and then calcining in a gas of nitrogen, helium or argon at 250-800° C. for 1-24 h to obtain the graphene modified iron-based catalyst, and
• wherein when the promoter is 0 part by mass, the step (3) is omitted;
• wherein the iron oxide is one selected from a group consisting of ferroferric oxide, ferric oxide, ferrous oxide, and any combination thereof;
• and the iron oxide has a particle size of 50-1000 nm.