| 초록 |
Considerable progress has been made in the conversion of carbon dioxide (CO2), which is highly thermodynamically stable, into liquid hydrocarbons using metal oxide/ zeolite composite catalysts. Herein, we report a bifunctional iron aluminum oxide (FeAlOx) catalyst that directly converts CO2 into C5+ hydrocarbons with an overall selectivity of 77.0% and CO2 conversion of 20.2% at a H2/CO2 ratio of 1:1. Notably, the selectivity for linear α-olefins (LAOs) was 52.4%, accounting for 78.4% of the total C4+ olefins. At a high H2/CO2 ratio of 3:1, the yield of C5+ hydrocarbons was 19.7%. The reducible magnetite (Fe3O4) phase, which contains surface oxygen vacancies, facilitated the reverse-water−gas-shift (RWGS) reaction to form CO via CO2 hydrogenation, and subsequent C−C coupling over Hägg iron carbide afforded lower olefins (C2−C4=). Long-chain LAOs were then formed on the surface of amorphous aluminum oxide (AlOx) via the readsorption of C2−C4=. |
