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.
- Porous metal oxides
- Supercritical solvents
Warner, G., Hansen, T. S., Riisager, A., Beach, E. S., Barta, K., & Anastas, P. T. (2014). Depolymerization of organosolv lignin using doped porous metal oxides in supercritical methanol. Bioresource Technology, 161, 78-83. https://doi.org/10.1016/j.biortech.2014.02.092