Ru-catalyzed oxidative cleavage of guaiacyl glycerol-β-guaiacyl ether-a representative β-O-4 lignin model compound

Mayra Melián Rodríguez*, Shunmugavel Saravanamurugan, Sebastian Meier, Søren Kegnæs, Anders Riisager

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The introduction of efficient and selective catalytic methods for aerobic oxidation of lignin and lignin model compounds to aromatics can extend the role of lignin applications in biorefineries. The current study focussed on the catalytic oxidative transformation of guaiacyl glycerol-β-guaiacyl ether (GGGE)–a β-O-4 lignin model compound to produce basic aromatic compounds (guaiacol, vanillin and vanillic acid) using metal-supported catalysts. Ru/Al2O3, prepared with ruthenium(IV) oxide hydrate, showed the highest yields of the desired products (∼60%) in acetonitrile in a batch reactor at 160 °C and 5-bar of 20% oxygen in argon. Alternative catalysts containing other transition metals (Ag, Fe, Mn, Co and Cu) supported on alumina, and ruthenium catalysts based on alternative supports (silica, spinel, HY zeolite and zirconia) gave significantly lower activities compared to Ru/Al2O3 at identical reaction conditions. Moreover, the Ru/Al2O3 catalyst was successfully reused in five consecutive reaction runs with only a minor decrease in catalytic performance.
Original languageEnglish
Article number832
JournalCatalysts
Volume9
Issue number10
Number of pages12
ISSN2073-4344
DOIs
Publication statusPublished - 2019

Keywords

  • Aerobic oxidation
  • Ruthenium
  • Heterogeneous catalysis
  • Lignin valorization
  • Guaiacyl glycerol-β-guaiacy ether

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