MOFs-Derived Fe–Co Bimetallic Catalyst for Selective CO2 Hydrogenation to Light Olefins

The catalysis of CO 2 to light olefins (C 2 = –C 4 = ) utilizing Fe–Co bimetallic catalysts is deemed a practicable approach to counteract the excessive emission of CO 2 . However, a significant research gap exists in the study of manipulating the interaction between Fe–Co alloys, particularly in terms of component control. In this work, a range of bimetallic catalysts with varying Co/Fe molar ratios supported on ZrO 2 were obtained through pyrolysis of mixed metal organic framework NH 2 -MIL-88B(Fe/Co)@UiO-66 that enables the hydrogenation of CO 2 to C 2 = –C 4 = . Notably, the catalyst 10Fe1Co@ZrO 2 exhibited a C 2 = –C 4 = selectivity of 45% at a CO 2 conversion of 44.6%. The characterization results authenticate that, compared to the bare Fe catalyst, introducing Co significantly enhances the CO 2 adsorption and conversion. Intriguingly, CoFe 2 O 4 formed in both 10Fe1Co@ZrO 2 and 5Fe1Co@ZrO 2 undergoes reduction to generate Co x Fe y, facilitating its subsequent carbonization into the active phase χ-(Co x Fe 1– x ) 5 C 2 more readily during the reaction process.