On the oxidative valorization of lignin to high-value chemicals: A critical review of opportunities and challenges

Omar Y. Abdelaziz, Ida Clemmensen, Sebastian Meier, Carina A. E. Costa, Alírio E. Rodrigues, Christian P. Hulteberg, Anders Riisager*

*Corresponding author for this work

Research output: Contribution to journalReviewpeer-review

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Abstract

The efficient valorization of lignin is crucial if we are to replace current petroleum-based feedstock and establish more sustainable and competitive lignocellulosic biorefineries. Pulp and paper mills and second-generation biorefineries produce large quantities of low-value technical lignin as a by-product, which is often combusted on-site for energy recovery. This review focuses on the conversion of technical lignins by oxidative depolymerization employing heterogeneous catalysts. It scrutinizes the current literature describing the use of various heterogeneous catalysts in the oxidative depolymerization of lignin, and includes a comparison of the methods, catalyst loadings, reaction media, and types of catalyst applied, as well as the reaction products and yields. Furthermore, current techniques for the determination of product yields and product recovery are discussed. Finally, challenges and suggestions for future approaches are outlined.
Original languageEnglish
Article numbere202201232
JournalChemSusChem
Volume15
Issue number20
Number of pages20
ISSN1864-5631
DOIs
Publication statusPublished - 2022

Keywords

  • Advanced analytics
  • Aromatics recovery
  • Biomass
  • Heterogeneous catalysis
  • Lignin valorization
  • Oxidative depolymerization

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