(336d) Direct Production of Gasoline-Range Hydrocarbons from Carbon Dioxide over Iron-Based Multifunctional Catalysts
AIChE Annual Meeting
2017
2017 Annual Meeting
Topical Conference: Innovations of Green Process Engineering for Sustainable Energy and Environment
Breakthroughs in C1 to Chemicals and Processing Engineering
Tuesday, October 31, 2017 - 1:15pm to 1:30pm
Herein, we have succeeded in preparing high efficient, stable, and multifunctional NaâFe3O4/Zeolite catalysts for the direct production of gasoline-range (C5âC11) hydrocarbons from CO2 hydrogenation. This catalyst displayed record selectivity towards C5âC11 hydrocarbons (78%) as well as low CH4 and CO selectivity under industrial relevant conditions, and gasoline fraction are mainly isoparaffins and aromatics thus favouring the octane number. Moreover, the composition of C5âC11 can be tuned by the choice of zeolite type and the integration manner of multifunctional catalyst. When NaâFe3O4 nanocatalyst was matched with HZSM-5 zeolite and integrated by granule-mixing manner, up to 63% of aromatics in gasoline fraction were produced. While NaâFe3O4 was matched with HMCM-22 zeolite, up to 60% of isoparaffins in gasoline fraction were obtained under the dual-bed configuration. Not only that, the multifunctional catalyst exhibited a remarkable stability for 1,000 h on stream, which definitely has the potential to be a promising industrial catalyst for CO2 utilization to liquid fuels.
In-depth characterizations indicate that, during CO2 hydrogenation reaction, this catalyst enables RWGS over Fe3O4 sites, olefin synthesis over Fe5C2 sites, and oligomerization/aromatization/isomerization over zeolite acid sites. The concerted action of the active sites calls for precise control of their structures and proximity. This study paves a new path for the synthesis of liquid fuels by utilizing CO2 and H2. Furthermore, it provides an important approach for dealing with the intermittency of renewable sources (sun, wind and so on) by storing energy in liquid fuels.
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