Selective CO2 hydrogenation to liquid fuels over Na-decorated FeMgMnOx catalyst with high carbon efficiency

Abstract

Direct synthesis of liquid fuels (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-decorated Fe catalysts promoted by combination of Mg and Mn and investigate their synergistic effect in the catalytic CO2 hydrogenation reaction. The optimized amounts of promoters result in a significant improvement in the catalytic performance of NaFe2O3. The CO2 conversion increases by 1.6-fold, while the total selectivity of CO and CH4 is suppressed to below 21.3 %. The characteristic results reveal the enhanced surface alkalinity and electron transfer favor CO2 adsorption and tuned the local H/C ratio in the vicinity of iron species, 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.