Catalytic hydroprocessing of lignin under thermal and ultrasound conditions

Finch, Kenneth B.; Richards, Ryan M.; Richel, Aurore; Medvedovici, Andrei; Gheorghe, Nicoleta; Verziu, Marian; Coman, Simona M.; Pârvulescu, Vasile I.

doi:10.1016/j.cattod.2012.02.051

Cited by 28 publications

(21 citation statements)

References 30 publications

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“…The conversion rate and the mass distribution of products depends on the procedure used for the pretreatment (acidic or alkali) of lignin. This means that in most cases, acidic extraction leads to a larger extent of depolymerization reaction ( [80] Top Curr Chem (Z) (2017) 375:41 [66]. Additionally, work by Napoly and co-workers shows that it is possible to obtain vanillin-based monomers with yield equal to 0.51 wt% in the presence of a tungsten-based catalyst and an oxidizing agent such as H 2 O 2 [67].…”

Section: Homogenous and Heterogeneous Sonocatalysismentioning

confidence: 99%

Sonocatalysis: A Potential Sustainable Pathway for the Valorization of Lignocellulosic Biomass and Derivatives

Kuna

Behling

Valange

et al. 2017

Topics in Current Chemistry Collections

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Lignocellulosic biomass represents a natural renewable chemical feedstock that can be used to produce high value-added chemicals and platform molecules. Nowadays, there are extensive studies on a variety of aspects concerning the valorization of lignocellulosic biomass into desirable products. Among the current technologies for biomass conversion some require extreme conditions along with high temperatures and pressures. Therefore, major technological innovations based on more economical and environmental methodologies are currently developed both in academic laboratories and in industry. In this context, ultrasound-assisted catalysis constitutes an alternative method offering new strategies to upgrade biomass. The possibility of combining catalysis with sonication indeed provides avenues that are worth exploring for the valorization of lignocellulosic compounds into value-added chemical feedstocks. In this mini-review, the available sonochemical systems are first presented, with a focus on the most important ultrasonic parameters, which is intended to provide a mechanistic background. Next, this contribution aims to provide insight into the most recent developments along with prominent examples in the field of sonocatalysis applied to the chemical transformation of lignocellulosic biomass and its derivatives.Abstract Lignocellulosic biomass represents a natural renewable chemical feedstock that can be used to produce high value-added chemicals and platform molecules. Nowadays, there are extensive studies on a variety of aspects concerning the valorization of lignocellulosic biomass into desirable products. Among the current technologies for biomass conversion some require extreme conditions along with high temperatures and pressures. Therefore, major technological innovations based on more economical and environmental methodologies are currently developed both in academic laboratories and in industry. In this context, ultrasound-assisted catalysis constitutes an alternative method offering new strategies to upgrade biomass. The possibility of combining catalysis with sonication indeed provides avenues that are worth exploring for the valorization of lignocellulosic compounds into value-added chemical feedstocks. In this mini-review, the available sonochemical systems are first presented, with a focus on the most important ultrasonic parameters, which is intended to provide a mechanistic background. Next, this contribution aims to provide insight into the most recent developments along with prominent examples in the field of sonocatalysis applied to the chemical transformation of lignocellulosic biomass and its derivatives.

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Section: Homogenous and Heterogeneous Sonocatalysismentioning

confidence: 99%

Sonocatalysis: A Potential Sustainable Pathway for the Valorization of Lignocellulosic Biomass and Derivatives

Kuna

Behling

Valange

et al. 2017

Topics in Current Chemistry Collections

View full text Add to dashboard Cite

show abstract

“…Chemical treatments, particularly hydrodeoxygenation and hydrogenolysis reactions, have been developed using first-row transition metals. Approaches based on heterogeneous Ni catalysts have been shown to produce lowerweight lignin oligomers and bio-oils from isolated lignins (Finch et al, 2012;Toledano et al, 2013). A Ni catalyst has also been demonstrated to selectively convert isolated lignins to monomers via solvolysis and hydrogenolysis (Song et al, 2013(Song et al, , 2012 2012; Olcese et al, 2012Olcese et al, , 2013Strassberger et al, 2013;Zhang et al, 2013a,b), sometimes under remarkably mild conditions of temperature and pressure (He et al, 2012;Wang and Rinaldi, 2012).…”

Section: Introductionmentioning

confidence: 97%

Depolymerization of organosolv lignin using doped porous metal oxides in supercritical methanol

Warner

Hansen

Riisager

et al. 2014

Bioresource Technology

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“…Conversely, alkaline chemicals methods have no effect on ether bonds that remain intact but are detrimental to carbon-carbon linkages. [9][10][11] In the perspective of valorisation, the radical scavenging ability of selected Miscanthus and switchgrass lignins arising from bioethanol production wastes is herein evaluated and correlated with their structural features and extraction process conditions.…”

Section: Introductionmentioning

confidence: 99%

Can Lignin Wastes Originating From Cellulosic Ethanol Biorefineries Act as Radical Scavenging Agents?

2014

Self Cite

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Lignin is a co-product from the biorefinery and paper industries. Its non-energetic valorisation remains a field of extensive research and development. In this perspective, this study was undertaken to evaluate the radical scavenging ability of selected herbaceous lignins. These lignins, extracted from either Miscanthus (Miscanthus Â giganteus) or switchgrass (Panicum virgatum L.), were selected as benchmarks for this study based on their chemical structure and average molecular weight. These technical lignins, which are side-products in the bioethanol production process, displayed a moderate antioxidant activity as evaluated by the 1,1-diphenyl-2-picrylhydrazil free radical scavenging test system. A correlation between the radical scavenging properties and the molecular features is proposed and discussed. Infrared spectroscopy was employed as a straightforward qualitative prediction tool for assessing the radical scavenging capacity.

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Catalytic hydroprocessing of lignin under thermal and ultrasound conditions

Cited by 28 publications

References 30 publications

Sonocatalysis: A Potential Sustainable Pathway for the Valorization of Lignocellulosic Biomass and Derivatives

Sonocatalysis: A Potential Sustainable Pathway for the Valorization of Lignocellulosic Biomass and Derivatives

Depolymerization of organosolv lignin using doped porous metal oxides in supercritical methanol

Can Lignin Wastes Originating From Cellulosic Ethanol Biorefineries Act as Radical Scavenging Agents?

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