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CO2 upgrading into bioproducts using a two-step abiotic-biotic system.

Geonhui Lee1, Hye-Jin Jo2, Jihoon Choi3

  • 1Department of Chemistry, University of California Berkeley, Berkeley, CA 94720.

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Summary

This study presents a novel two-step system converting carbon dioxide (CO2) into a valuable biopolymer. The process efficiently upgrades CO2 into poly(3-hydroxybutyrate) using an abiotic-biotic approach for sustainable chemical manufacturing.

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Area of Science:

  • Chemical Engineering
  • Biotechnology
  • Sustainable Chemistry

Background:

  • Direct electrosynthesis of carbon molecules (Cn, n > 4) from CO2 is challenging.
  • Valorization of CO2 to higher-value chemicals is of significant interest.

Purpose of the Study:

  • To develop a two-step abiotic-biotic system for upgrading CO2 into the biopolymer poly(3-hydroxybutyrate).
  • To demonstrate the feasibility of this system for sustainable chemical manufacturing.

Main Methods:

  • Utilized a Cu-Ag tandem electrocatalyst to convert CO2 into C2 oxygenates (acetate).
  • Employed *Cupriavidus necator* in a bioreactor to upgrade electrosynthesized acetate into biopolymer.
  • Demonstrated purification of the resulting biopolymer into powder.

Main Results:

  • Electrolysis produced a bio-compatible liquid stream with ~200 mM acetate.
  • Biopolymer production rate achieved was 32 ± 3.5 mg L-1 h-1.
  • Successfully purified the biopolymer into a powder.

Conclusions:

  • The developed abiotic-biotic system efficiently upgrades CO2 to poly(3-hydroxybutyrate).
  • The high productivity indicates feasibility for sustainable chemical manufacturing.
  • This approach offers a promising route for CO2 valorization beyond simple C1-2 products.