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

Warner, G., Hansen, T. S., Riisager, A., Beach, E. S., Barta, K. & Anastas, P. T., Jun-2014, In : Bioresource Technology. 161, p. 78-83 6 p.

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  • Depolymerization of organosolv lignin using doped porous metal oxides

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DOI

  • Genoa Warner
  • Thomas S Hansen
  • Anders Riisager
  • Evan S Beach
  • Katalin Barta
  • Paul T Anastas

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 degrees 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. (C) 2014 Published by Elsevier Ltd.

Original languageEnglish
Pages (from-to)78-83
Number of pages6
JournalBioresource Technology
Volume161
Publication statusPublished - Jun-2014

    Keywords

  • Lignin, Catalysis, Porous metal oxides, Bio-oil, Supercritical solvents, ARYL ETHERS, SOLVENT-EXTRACTION, HYDROGEN-TRANSFER, CATALYSTS, HYDRODEOXYGENATION, NI, GUAIACOL, FRACTIONATION, CONVERSION, PYROLYSIS

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