Integrating HZSM‑5 nanosheets with Fe-Co bimetallic catalyst toward efficient CO2-to-gasoline fuel conversion

Abstract

Direct catalytic carbon dioxide (CO2) hydrogenation into gasoline fuel (C5+ hydrocarbons) not only reduces the emission of greenhouse gas CO2, but also alleviates the consumption of fossil fuels. Herein, we design a tandem catalyst Fe-Co/HZSM-5 consisting of the Fe-Co bimetallic catalyst and b-axis oriented HZSM-5 nanosheets for the direct and selective conversion of CO2 to gasoline fuel, and systematically investigate the effects brought by the control of catalyst parameters and the reaction conditions. The HZSM-5 nanosheets with short diffusion channels (b-axis thickness of 30 nm) and appropriate acid property (concentration and strength) offer the maximum gasoline fuel selectivity, up to ∼62.7 % at 36.3 % CO2 conversion. The shortened micropore channels facilitate a better products diffusion, which can not only improve the liquid hydrocarbons yield, but also alleviate the catalyst deactivation caused by the coke deposition. The appropriate acid property is in favor of the conversion of olefins generated over Fe-Co catalyst. In summary, it is reasonable to believe that the Fe-Co/HZSM-5 catalyst is a promising candidate for further industrial applications in CO2-to-gasoline fuel conversion.