Molybdenum carbide, supercritical ethanol and base: Keys for unlocking renewable BTEX from lignin

Matthew Y. Lui*, Anthony F. Masters, Thomas Maschmeyer, Alexander K.L. Yuen*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

2 Citations (Scopus)

Abstract

Supported molybdenum hemicarbide catalysts were prepared and employed for the depolymerization and deoxygenation of waste lignins to aromatics in supercritical ethanol. Titanium nitride appears be a particularly beneficial support material. Depolymerization at 330 °C led to a higher yield and selectivity for arenes than at 280 °C. Base is essential for efficient substrate conversion: the basic constituents inherent in waste lignins are suitable, as is added sodium hydroxide. Without base, depolymerization is poor, the yield of aromatics is very low, and substrate defunctionalisation does not occur. A significant proportion of aromatic products is formed from supercritical ethanol itself, including benzene, which is likely to be present in all catalytic runs due to ethanol aromatization. Hence the total arene content produced is actually higher than has been widely reported. Catalytic cracking of ethanol leads to C1-units, which add to reaction intermediates to give aromatics containing odd numbers of carbons (e.g. toluene).

Original languageEnglish
Article number122351
JournalApplied Catalysis B: Environmental
Volume325
Early online date13 Jan 2023
DOIs
Publication statusPublished - 15 May 2023

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Ethanol aromatization
  • Lignin valorization
  • Molybdenum carbide
  • Renewable chemicals
  • Supercritical ethanol

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