Depolymerization of organosolv lignin using doped porous metal oxides in supercritical methanol

Genoa Warner, Thomas Søndergaard Hansen, Anders Riisager, Evan S. Beach, Katalin Barta, Paul T. Anastas

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An isolated, solvent-extracted lignin from candlenut (Aleurites moluccana) biomass was subjected to catalytic depolymerization in the presence of supercritical methanol, using a range of porous metal oxides derived from hydrotalcite-like precursors. The most effective catalysts in terms of lignin conversion to methanol-soluble products, without char formation, were based on copper in combination with other dopants based on relatively earth-abundant metals. Nearly complete conversion of lignin to bio-oil composed of monomers and low-mass oligomers with high aromatic content was obtained in 6. h at 310. °C using a catalyst based on a Cu- and La-doped hydrotalcite-like precursor. Product mixtures were characterized by NMR spectroscopy, gel permeation chromatography, and GC-MS. © 2014.
Original languageEnglish
JournalBioresource Technology
Volume161
Pages (from-to)78-83
ISSN0960-8524
DOIs
Publication statusPublished - 2014

Keywords

  • Lignin
  • Catalysis
  • Porous metal oxides
  • Bio-oil
  • Supercritical solvents

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