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Direct synthesis of branched hydrocarbons from CO2 over composite catalysts in a single reactor

Journal Article · · Journal of CO2 Utilization
The thermocatalytic hydrogenation of CO2 to hydrocarbons using a composite catalyst system in a single reactor under mild reaction conditions was investigated, by combining methanol synthesis, methanol dehydration and dimethyl ether homologation catalysts. High selectivity to isoparaffins, which are versatile precursors to sustainable aviation fuels, was achieved. The use of Cu/BEA significantly improved both the conversion of oxygenates and the hydrocarbon yield compared to HBEA by facilitating H-incorporation in the C-chain growth during the homologation reaction. A study of catalyst composition and reaction conditions revealed that nearly complete conversion of oxygenates was achieved using a stacked-bed configuration, providing high C-selectivity to C4+ hydrocarbons (34.1% among all products and 95.5% in products excluding CO). The ability to completely convert oxygenates to hydrocarbons and achieve high CO-free selectivity to desired hydrocarbon products is unprecedented in CO2-to-hydrocarbon reports, and advantageous for downstream separation, as CO can be easily separated and recycled to improve overall hydrocarbon production in an integrated process.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1900008
Report Number(s):
NREL/JA-5100-84212; MainId:84985; UUID:2af25f2d-f5c0-48cc-bd9e-93499b63da11; MainAdminID:68064
Journal Information:
Journal of CO2 Utilization, Journal Name: Journal of CO2 Utilization Vol. 66; ISSN 2212-9820
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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