| 초록 |
Monodisperse nanoparticles (NPs) of CoFe2O4 are synthesized as an efficient catalyst for CO2 hydrogenation to high value-added chemicals. Thus, Na-promoted CoFe2O4 supported on carbon nanotube (Na-CoFe2O4/CNT) catalyst exhibits high CO2 conversion and light olefin selectivity. The performance is superior to those of single metal NP catalysts and a physically mixed Na-Fe3O4+Co/CNT catalyst. The excellent performance of the Na-CoFe2O4/CNT catalyst originates from its facile formation of a unique active site of bimetallic alloy Hägg carbide (Fe1-xCox)5C2, which catalyzes higher CO2 conversion and better selectivity toward light olefins and C5+ hydrocarbons relative to conventional active site χ-Fe5C2 derived from Fe-only catalysts. The single source precursor CoFe2O4 forms exclusively the single-phase alloy carbide phase promoted by the Na promoter, while mixed Na-Fe3O4+Co forms an isolated Co phase together with the alloy carbide, resulting in high selectivity to undesired CH4. |
