▎ 摘　　要

NOVELTY - Carbon dioxide hydrogenation to synthesize hydrocarbon compound, involves using catalyst, where the catalyst is potassium-transition metal co-promoting iron-based catalyst which is composed of carbon black, nitrogen-doped graphene half-coated with ferric oxide particles, transition metal and potassium as alkali metal. In potassium-transition metal co-promoting iron-based catalyst, the content of iron element is 1-40 wt.%, the content of transition metal is 1-30 wt.% and the content of potassium as alkali metal is 1-5 wt.%. The transition metal is one or more of palladium, nickel, cobalt, indium and chromium. The carbon dioxide hydrogenation reaction has carbon dioxide conversion rate of 22.73-40.62%, methane selectivity of 15.26-37.12% and carbon monoxide selectivity of 13.05-89.96%. The selectivity for carbon hydrocarbons with 2 to 4 carbon atoms is 12.22-43.99%, and the selectivity for carbon hydrocarbons with carbon atoms 5 or more is 22.64-72.51%. USE - Method for carbon dioxide hydrogenation to synthesize hydrocarbon. ADVANTAGE - The method is simple, and capable of using potassium-transition metal to promote iron-based catalyst as carbon dioxide hydrogenation for synthesizing hydrocarbon compounds, and effectively solving the problem of low selectivity of high-carbon hydrocarbons existing in the current method of carbon dioxide hydrogenation to synthesize hydrocarbon compounds.