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Selective Biomass Valorization via Cascade Photooxidation and Photothermal Hydride Shift.

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This study introduces a novel photocatalytic method for producing lactic acid (LA) from biomass. Multifunctional catalysts significantly enhance LA selectivity and productivity for sustainable biodegradable plastics.

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Area of Science:

  • Green Chemistry
  • Materials Science
  • Catalysis

Background:

  • Traditional thermocatalysis for lactic acid (LA) production requires harsh conditions.
  • Photocatalytic upgrading of biomass is a sustainable alternative but suffers from low selectivity.
  • Pyruvaldehyde (PYA) is a key intermediate prone to side reactions during photoreforming.

Purpose of the Study:

  • To develop a highly selective photocatalytic process for lactic acid (LA) production from biomass-derived carbohydrates and glycerol.
  • To overcome the selectivity limitations of aqueous photoreforming at neutral pH.
  • To engineer multifunctional catalysts for efficient solar biorefineries.

Main Methods:

  • Utilized Lewis-acid sites (unsaturated Ti4+) and plasmonic Au nanoparticles in a multifunctional catalyst.
  • Investigated a cascade reaction involving photooxidation and a 1,2-hydride shift.
  • Employed aqueous photoreforming under ambient conditions.

Main Results:

  • Achieved >90% selectivity for lactic acid (LA), a 3.4-fold increase compared to purely photocatalytic methods.
  • Demonstrated an unprecedented productivity of 130.8 mmol g-1 h-1.
  • The catalyst design suppressed overoxidation and parallel redox reactions.

Conclusions:

  • Multifunctional catalysts can effectively steer complex reaction networks for high-value chemical production.
  • This approach offers a sustainable and efficient route to biodegradable plastics via solar biorefining.
  • The developed cascade reaction mechanism provides a new strategy for selective biomass upgrading.