Boosting Long-Chain Linear α-Olefins Synthesis from CO<sub>2</sub> Hydrogenation over K–FeMn Catalyst via Stabilizing Active Sites
Kangzhou Wang, Ziqin Li, Tong Liu, Weizhe Gao, Yang Tang, Kuan‐Guan Liu, Xinhua Gao, Qingxiang Ma, Jianli Zhang, Tiansheng Zhao, Noritatsu Tsubaki
Abstract
CO 2 to long-chain linear α-olefins (LAOs) is an effective strategy for the production of LAOs and the realization of CO 2 resource utilization. However, effective control of CO 2 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 CO 2 hydrogenation to LAOs, which achieved more than 67% for selectivity of LAOs in C 4+ hydrocarbon and CO 2 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 CO 2 hydrogenation to LAOs and the development of efficient catalysts.