Tailoring the CO₂ Hydrogenation Performance of Fe-Based Catalyst via Unique Confinement Effect of the Carbon Shell

Even though Fe-based catalysts have been widely employed for CO₂ hydrogenation into hydrocarbons, oxygenates, liquid fuels, etc., the precise regulation of their physicochemical properties is needed to enhance the catalytic performance. Herein, under the guidance of the traditional concept in heterogeneous catalysis-confinement effect, a core-shell structured catalyst Na-Fe₃ O₄ @C is constructed to boost the CO₂ hydrogenation performance. Benefiting from the carbon-chain growth limitation, tailorable H₂ /CO₂ ratio on the catalytic interface, and unique electronic property that all endowed by the confinement effect, the selectivity and space-time yield of light olefins (C₂ ⁼ -C₄ ⁼ ) are as high as 47.4 % and 15.9 g mol_Fe ^-1  h^-1 , respectively, which are all notably higher than that from the shell-less counterpart. The function mechanism of the confinement effect in Fe-based catalysts are clarified in detail by multiple characterization and density functional theory (DFT). This work may offer a new prospect for the rational design of CO₂ hydrogenation catalyst.