Synergistic Effect of Alkali Na and K Promoter on Fe-Co-Cu-Al Catalysts for CO2 Hydrogenation to Light Hydrocarbons

Alkali metal K- and/or Na-promoted FeCoCuAl catalysts were synthesized by precipitation and impregnation, their physicochemical catalytic performance for CO2 hydrogenation to light hydrocarbons was also investigated in the present work. The results indicate that Na K introduction leads formation of active phase metallic Fe Fe-Co crystals order < K-Na. simultaneous causes a synergistic effect on increasing basicity electron-rich property, promoting sites Fe@Cu Fe-Co@Cu with Cu0 as crystal core. These effects are advantageous H2 dissociative adsorption activation, giving high conversion hydrogenation. Moreover, (110) (200) provide centers further O-C-Fe intermediate after CO produced RWGS. It is beneficial carbon chain growth C2+ hydrocarbons, including olefins alkanes. simultaneously modified K-Na exhibits highest selectivity 52.87 mol% 89.70 mol%, respectively.