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Transition metal (Ti, Mo, Nb, W) nitride catalysts for lignin depolymerisation.

Long Chen1, Tamás I Korányi1, Emiel J M Hensen1

  • 1Laboratory of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands. e.j.m.hensen@tue.nl.

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Cheap titanium nitride catalysts efficiently depolymerize lignin into aromatic monomers using supercritical ethanol, yielding 19 wt% from soda lignin. The study explores the reaction mechanism for this promising biomass conversion process.

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Area of Science:

  • Catalysis
  • Materials Science
  • Biomass Conversion

Background:

  • Lignin depolymerization is crucial for valorizing biomass.
  • Supercritical ethanol offers a green reaction medium.
  • Metal nitrides are emerging as effective catalysts.

Purpose of the Study:

  • To evaluate titanium nitride as a catalyst for lignin depolymerization.
  • To determine the yield of aromatic monomers.
  • To elucidate the reaction mechanism.

Main Methods:

  • Depolymerization of soda lignin in supercritical ethanol using titanium nitride.
  • Analysis of reaction products.
  • Guaiacol model compound study to understand reaction pathways.

Main Results:

  • Titanium nitride catalyzed the depolymerization of soda lignin.
  • Achieved a 19 wt% yield of aromatic monomers.
  • Identified key intermediates and products, suggesting a reaction mechanism.

Conclusions:

  • Titanium nitride is a cost-effective and abundant catalyst for lignin depolymerization.
  • Supercritical ethanol is a viable medium for producing aromatic monomers from lignin.
  • Understanding the mechanism aids in optimizing catalytic processes for biomass valorization.