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

Abstract

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 gcat.·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.