Directly converting CO2 into gasoline not only contributes to mitigating CO2 emission, but also is beneficial to reducing the dependence on petrochemicals. The composition of gasoline-range hydrocarbons is one of the key factors influencing the quality of gasoline fuel, adjusting and controlling of gasoline composition is a research hotspot with great challenges in this process. In this presentation, the recent progresses on the adjusting and controlling of gasoline compositions in the process of CO2 hydrogenation to gasoline-range hydrocarbons, which developed in our laboratory, were reported. In the CO2 hydrogenation to gasoline-range hydroarbons over Na-Fe3O4/HZSM-5, the aromatics content in gasoline products and its distribution of carbon number are both influenced by the SiO2/Al2O3 ratio of HZSM-5. The catalyst with lower SiO2/Al2O3 ratio is beneficial for the production of lower aromatics. Simutaneously, the formation process of aromatics over HZSM-5 during CO2 hydrogenation has been also discussed in this presentation. Influences of metal modification of ZSM-5 on the composition of gasoline-range hydrocarbon products show that, the Na-Fe3O4/Cu-ZSM-5 catalyst exhibits an improved isoparaffin content in gasoline-range hydrocarbons at high yield to gasoline products among all the investigated Na-Fe3O4/M-ZSM-5 multifunctional catalysts. The optimum copper loading on ZSM-5 is 8%, at which the maximum isoparaffin content of gasoline products could be obtained. More than 50% content of isoparaffin in gasoline could be achieved when Na-Fe3O4 and Cu-ZSM-5 were loaded in a dual-layer bed. Such isoparaffin-rich gasoline fuels could meet the upgradation requirement of the modern clean gasoline.

Catalytic hydrogenation of CO2 to gasoline-range hydrocarbons over Na-Fe3O4/M-ZSM-5 catalysts

2019 Spring National Meeting

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