Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions

Lignin is one of the main components of lignocellulosic biomass and corresponds to the first renewable source of aromatic compounds. It is obtained as a by-product in 100 million tons per year, mainly from the paper industry, from which only 2–3% is upgraded for chemistry purposes, with the rest bei...

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Autores principales:	Dolorès Bourbiaux, Yu Xu, Laurence Burel, Firat Goc, Pascal Fongarland, Régis Philippe, Guillaume Aubert, Cyril Aymonier, Franck Rataboul, Laurent Djakovitch
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	lignin oxidative depolymerization heterogeneous catalysis metallic nanoparticles palladium Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/be10562362c948a7a2587d783a642c32
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spelling	oai:doaj.org-article:be10562362c948a7a2587d783a642c322021-11-25T17:05:43ZInvestigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions10.3390/catal111113112073-4344https://doaj.org/article/be10562362c948a7a2587d783a642c322021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1311https://doaj.org/toc/2073-4344Lignin is one of the main components of lignocellulosic biomass and corresponds to the first renewable source of aromatic compounds. It is obtained as a by-product in 100 million tons per year, mainly from the paper industry, from which only 2–3% is upgraded for chemistry purposes, with the rest being used as an energy source. The richness of the functional groups in lignin makes it an attractive precursor for a wide variety of aromatic compounds. With this aim, we investigated the Pd-catalyzed depolymerization of lignin under mild oxidizing conditions (air, 150 °C, and aqueous NaOH) producing oxygenated aromatic compounds, such as vanillin, vanillic acid, and acetovanillone. Palladium catalysts were implemented following different strategies, involving nanoparticles stabilized in water, and nanoparticles were supported on TiO<sub>2</sub>. Significant conversion of lignin was observed in all cases; however, depending on the catalyst nature and the synthetic methods, differences were observed in terms of selectivity in aromatic monomers, mainly vanillin. All these aspects are discussed in detail in this report, which also provides new insights into the role that Pd-catalysts can play for the lignin depolymerization mechanism.Dolorès BourbiauxYu XuLaurence BurelFirat GocPascal FongarlandRégis PhilippeGuillaume AubertCyril AymonierFranck RataboulLaurent DjakovitchMDPI AGarticleligninoxidative depolymerizationheterogeneous catalysismetallic nanoparticlespalladiumChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1311, p 1311 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	lignin oxidative depolymerization heterogeneous catalysis metallic nanoparticles palladium Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	lignin oxidative depolymerization heterogeneous catalysis metallic nanoparticles palladium Chemical technology TP1-1185 Chemistry QD1-999 Dolorès Bourbiaux Yu Xu Laurence Burel Firat Goc Pascal Fongarland Régis Philippe Guillaume Aubert Cyril Aymonier Franck Rataboul Laurent Djakovitch Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions
description	Lignin is one of the main components of lignocellulosic biomass and corresponds to the first renewable source of aromatic compounds. It is obtained as a by-product in 100 million tons per year, mainly from the paper industry, from which only 2–3% is upgraded for chemistry purposes, with the rest being used as an energy source. The richness of the functional groups in lignin makes it an attractive precursor for a wide variety of aromatic compounds. With this aim, we investigated the Pd-catalyzed depolymerization of lignin under mild oxidizing conditions (air, 150 °C, and aqueous NaOH) producing oxygenated aromatic compounds, such as vanillin, vanillic acid, and acetovanillone. Palladium catalysts were implemented following different strategies, involving nanoparticles stabilized in water, and nanoparticles were supported on TiO<sub>2</sub>. Significant conversion of lignin was observed in all cases; however, depending on the catalyst nature and the synthetic methods, differences were observed in terms of selectivity in aromatic monomers, mainly vanillin. All these aspects are discussed in detail in this report, which also provides new insights into the role that Pd-catalysts can play for the lignin depolymerization mechanism.
format	article
author	Dolorès Bourbiaux Yu Xu Laurence Burel Firat Goc Pascal Fongarland Régis Philippe Guillaume Aubert Cyril Aymonier Franck Rataboul Laurent Djakovitch
author_facet	Dolorès Bourbiaux Yu Xu Laurence Burel Firat Goc Pascal Fongarland Régis Philippe Guillaume Aubert Cyril Aymonier Franck Rataboul Laurent Djakovitch
author_sort	Dolorès Bourbiaux
title	Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions
title_short	Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions
title_full	Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions
title_fullStr	Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions
title_full_unstemmed	Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions
title_sort	investigating (pseudo)-heterogeneous pd-catalysts for kraft lignin depolymerization under mild aqueous basic conditions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/be10562362c948a7a2587d783a642c32
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Investigating (Pseudo)-Heterogeneous Pd-Catalysts for Kraft Lignin Depolymerization under Mild Aqueous Basic Conditions

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