Boosting Liquid Hydrocarbon Synthesis from CO2 Hydrogenation via Tailoring Acid Properties of HZSM-5 Zeolite

Carbon dioxide (CO2) hydrogenation to higher hydrocarbon has aroused widespread concern because it has developed a nonoil route to produce value-added chemicals. However, boosting the production of higher hydrocarbon has been considered a challenge. Here, we report a multifunctional K-Fe3O4/Ni-ZSM-5 catalyst with excellent higher hydrocarbon (C4+ HC) selectivity and CO2 conversion for CO2 hydrogenation to C4+ HC. To study the effect of the acid properties on catalytic performance, the optimized catalysts were further characterized by multiple techniques. The characterization results demonstrated that this catalyst possessed outstanding C4+ HC selectivity up to 74.7% and CO2 conversion of 38.2%, as well as CH4 selectivity of only 10.0%. Meanwhile, the main components in the liquid hydrocarbons were aromatic, which account for 69.1% of the liquid hydrocarbon. Appropriate acid properties of the HZSM-5 zeolite were modified by introducing Ni species and regulating the SiO2/Al2O3 ratio, and it was beneficial to the aromatization of light olefins to produce higher hydrocarbon.