Abstract
The direct production of liquid fuels from CO2 hydrogenation has attracted enormous interest for its significant roles in mitigating CO2 emissions and reducing dependence on petrochemicals. Here we report a highly efficient, stable and multifunctional Na–Fe3O4/HZSM-5 catalyst, which can directly convert CO2 to gasoline-range (C5–C11) hydrocarbons with selectivity up to 78% of all hydrocarbons while only 4% methane at a CO2 conversion of 22% under industrial relevant conditions. It is achieved by a multifunctional catalyst providing three types of active sites (Fe3O4, Fe5C2 and acid sites), which cooperatively catalyse a tandem reaction. More significantly, the appropriate proximity of three types of active sites plays a crucial role in the successive and synergetic catalytic conversion of CO2 to gasoline. The multifunctional catalyst, exhibiting a remarkable stability for 1,000 h on stream, definitely has the potential to be a promising industrial catalyst for CO2 utilization to liquid fuels.
Highlights
The direct production of liquid fuels from CO2 hydrogenation has attracted enormous interest for its significant roles in mitigating CO2 emissions and reducing dependence on petrochemicals
The description of zeolite channels and NH3 temperature-programmed desorption (NH3-TPD) results were listed in Supplementary Table 1 and Supplementary Fig. 1
It is noteworthy that three types of zeolites with 10 member ring (MR) channels exhibit higher C5–C11 selectivities in the order of HZSM-5 (3-dimensional)4HMCM-22 (2-dimensional)4HZSM-23 (1-dimensional)
Summary
The direct production of liquid fuels from CO2 hydrogenation has attracted enormous interest for its significant roles in mitigating CO2 emissions and reducing dependence on petrochemicals. We report a highly efficient, stable and multifunctional Na–Fe3O4/HZSM-5 catalyst, which can directly convert CO2 to gasoline-range (C5–C11) hydrocarbons with selectivity up to 78% of all hydrocarbons while only 4% methane at a CO2 conversion of 22% under industrial relevant conditions. For the conventional iron-based catalysts, the hydrocarbon products generally follow the Anderson–Schulz–Flory (ASF) distribution, which is inherently wide and unselective[17] More these hydrocarbons comprise mainly olefins and normal paraffins, with low octane number and unsuitable as gasoline fuel. We report a high efficient multifunctional catalyst comprised of Na–Fe3O4 nanocatalyst and nanocrystalline HZSM-5 zeolite (Na–Fe3O4/HZSM-5 catalyst) for the direct conversion of CO2 to gasoline-range hydrocarbons This catalyst displays record selectivity towards C5–C11 hydrocarbons (78%) as well as low CH4 and CO selectivity under industrially relevant conditions. It was discovered that the choice of active components and the integration manner of the components are crucial to control the product selectivity
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