Selective hydrogenation of CO2 and CO to useful light olefins over octahedral molecular sieve manganese oxide supported iron catalysts

► Porous Fe-Mn-K catalysts selectively hydrogenate CO2 and CO to light olefins. ► Particle sizes and catalytic interfaces influence catalytic activity. ► DART MS spectra show strong readsorption of olefins on catalysts. ► Fe, Mn, and K synergistically improve catalytic activity and selectivity.