▎ 摘　　要

NOVELTY - Preparing hydrogen and graphene by hydrocarbons catalytic cracking using porous metal based catalyst comprises e.g. (i) adding lanthanum nitrate, cobalt nitrate, molybdenum nitrate, nickel nitrate and copper nitrate into distilled water to form a mixed solution, drawing the mixed solution into a syringe with a stainless steel needle, fixing on a propeller pump equipped with high-voltage electrostatic device, inserting a stainless steel needle into the reaction device, adjusting certain high voltage on stainless steel needle of the syringe using high voltage electrostatic device, spraying the mixed solution onto the rotating disk carrying the metal catalyst carrier in the reaction device and reacting, (ii) collecting the metal catalyst support on the rotating disc, calcining, and cooling to obtain porous metal-based catalyst, and (iii) taking the obtained porous metal-based catalyst as a catalyst and performing hydrocarbons catalytic cracking, cooling, washing and drying. USE - The method is useful for preparing hydrogen and graphene by hydrocarbons catalytic cracking using porous metal based catalyst. ADVANTAGE - The graphene: has high specific surface area. DETAILED DESCRIPTION - Preparing hydrogen and graphene by hydrocarbons catalytic cracking using porous metal based catalyst comprises (i) adding lanthanum nitrate, cobalt nitrate, molybdenum nitrate, nickel nitrate and copper nitrate into distilled water to form a mixed solution, drawing the mixed solution into a syringe with a stainless steel needle, fixing on a propeller pump equipped with high-voltage electrostatic device, inserting a stainless steel needle into the reaction device, adjusting certain high voltage on stainless steel needle of the syringe using high voltage electrostatic device, then adjusting the speed of propulsion pump, spraying the mixed solution onto the rotating disk carrying the metal catalyst carrier in the reaction device, reacting at 60-80 degrees C, where structure of the reaction device includes: a jacket body provided on the outer wall, the jacket is provided with a hot fluid inlet and a hot fluid outlet, passing the hot fluid into the hot fluid inlet and maintaining the temperature in the reaction kettle at 60-80 degrees C, adjusting a rotating disc in the middle of the kettle through a rotating shaft, providing annular baffle on the end of the rotating disc, passing the rotating shaft through the bottom of the kettle body and connecting with a rotating electric machine, providing a cover body on the kettle body, extending the stainless steel needle from the cover body into the kettle body and locating above the rotating disc, then arranging a groove on the rotating disc and placing a metal catalyst carrier in the groove, (ii) collecting the metal catalyst support on the rotating disc, calcining at 600-900 degrees C for 24 hours, and naturally cooling to room temperature to obtain porous metal-based catalyst, and (iii) taking the obtained porous metal-based catalyst as a catalyst and performing hydrocarbons catalytic cracking, the conditions for regulating the hydrocarbon cracking reaction in a fixed-bed reactor are: the temperature is 600-1000 degrees C and the pressure is 0.5-5 MPa, the reaction space velocity is 20-200 l/(h.g.cat), collecting the gas generated from the cracking reaction as a hydrogen-rich gas, cooling the residue formed after the cracking reaction to less than 100 degrees C, washing to neutral and drying to obtain crude graphene, further washing, centrifuging and drying to obtain graphene.