Boosting Long-Chain Linear α-Olefins Synthesis from CO₂ Hydrogenation over K-FeMn Catalyst via Stabilizing Active Sites

CO₂ to long-chain linear α-olefins (LAOs) is an effective strategy for the production of LAOs and the realization of CO₂ resource utilization. However, effective control of CO₂ activation and chain growth to improve catalytic activity and LAOs selectivity remains a great challenge. Herein, we report that K-FeMn catalyst prepared by precoordinated combustion method exhibits prominent catalytic performance in the CO₂ hydrogenation to LAOs, which achieved more than 67% for selectivity of LAOs in C₄₊ hydrocarbon and CO₂ conversion of 36.6% at 320 °C, 1.5 MPa, and 30 g_cat.·h·mol^-1. The structure performance of the K-FeMn catalyst is well correlated. The catalysts prepared by precoordinated combustion possessed strong interactions between Fe and Mn species, which effectively promoted the generation of Fe-carbides and inhibited the hydrogenation of the generated olefins, thereby improving the selectivity of LAOs. These findings will provide a theoretical basis and guidance for an in-depth understanding of CO₂ hydrogenation to LAOs and the development of efficient catalysts.