High Selectivity CO₂ Hydrogenation to Liquid Fuel Over NaFeZnMn Catalyst

Direct synthesis of liquid fuel (C₅₊ hydrocarbons) through CO₂ hydrogenation has attracted considerable interest. However, it is plagued by high selectivity of C₁ by-products (CO and CH₄) and low reaction activity. Herein, we report that Na-FeZn catalysts promoted by a combination of metal additives and investigate their synergistic effect in the catalytic CO₂ hydrogenation reaction. The CO₂ conversion is high to 40.6% with the 68.3% C₅₊ selectivity. The characteristic results reveal the specific surface area has a great influence on the catalytic performance. Furthermore, the synergistic effect of Mn in the catalyst enhances CO₂ adsorption while weakening H₂ adsorption, thus remarkably promoting the carbon chain growth and limiting the production of C₁ products. This study offers a promising approach to modulating the metal electronic environment and improving carbon efficiency for CO₂ hydrogenation reactions.

We present a simple NaFeZnMn-S nanocatalyst that can effectively catalyze CO₂ hydrogenation to C₅₊ hydrocarbons. The selectivity towards C₅₊ hydrocarbons is as high as 68.3% at 40.6% CO₂ conversion.