Direct Synthesis of Branched Hydrocarbons from CO2 Over Composite Catalysts in a Single Reactor

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Abstract

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.

Original languageAmerican English
Article numberArticle No. 102261
Number of pages9
JournalJournal of CO2 Utilization
Volume66
DOIs
StatePublished - Dec 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd.

NREL Publication Number

  • NREL/JA-5100-84212

Keywords

  • branched hydrocarbons
  • CO2 hydrogenation
  • composite catalyst
  • Cu/BEA catalyst
  • process intensification

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