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Article Dans Une Revue Biomass and Bioenergy Année : 2024

Oligomeric fragments distribution, structure and functionalities upon ruthenium-catalyzed technical lignin depolymerization

Résumé

The development of effective lignin depolymerization is essential for the extraction of aromatic building blocks from renewable resources. In this study, technical lignins (Soda and Kraft) were depolymerized in supercritical ethanol using Ru/C as a catalyst in an inert (N 2) or a reducing (H 2) atmosphere. The effects of lignin structure and atmosphere were studied on the depolymerization, and the products formed such as solid residue, oligomeric fragments and monomers. Reasonable yields of oligomers and monomers (32.7 wt% and 4.7 wt%, respectively) were obtained after Ru/C-assisted Soda lignin depolymerization under both tested atmospheres, while in the case of Kraft lignin, H 2 and Ru/C were required to increase the yields of depolymerization products (30.9 wt% and 4.4 wt%, respectively). A comprehensive characterization of the reaction products (GC-MS, UV fluorescence and FTIR spectroscopy, 31 P and 2D HSQC NMR) was performed to evaluate the monomer/oligomer distribution and to determine the structure and functionalities of the oligomers. The analytical results indicate the formation of more condensed oligomeric lignin structures with predominant 5-5′ inter-unit linkages and the prevalence of demethylation or demethoxylation reactions depending on the type of the technical lignin exposed to hydrodeoxygenation. The oligomeric fragments are catalytically modified and depolymerized lignin with a wide range of new applications (coatings, resins, antioxidant agents, adhesives) contributing to the replacement of the petroleum-derived phenolic building-blocks.

Domaines

Chimie
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Origine : Publication financée par une institution
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification

Dates et versions

hal-04411333 , version 1 (23-01-2024)

Identifiants

Citer

Tina Ročnik Kozmelj, Erika Bartolomei, Anthony Dufour, Sebastien Leclerc, Philippe Arnoux, et al.. Oligomeric fragments distribution, structure and functionalities upon ruthenium-catalyzed technical lignin depolymerization. Biomass and Bioenergy, 2024, 181, pp.107056. ⟨10.1016/j.biombioe.2024.107056⟩. ⟨hal-04411333⟩
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