Hydrogenolysis of lignin over Ru-based catalysts: The role of the ruthenium in a lignin fragmentation process

Verziu, Marian; Tîrşoaga, Alina; Cojocaru, Bogdan; Bucur, Cristina; Tudora, Bogdan; Richel, Aurore; Aguedo, Mário; Samikannu, Ajaikumar; Mikkola, Jyri Pekka

doi:10.1016/j.mcat.2018.03.004

Cited by 39 publications

(11 citation statements)

References 76 publications

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“…[49] The different structure (hydrodynamic volume) between lignin products and calibration standards also impairs the quality of the molar masses determined by GPC. [50] Laser desorption ionization mass spectrometry (LDI-MS) as well as other ionization techniques has been used on lignin and its products [51][52][53][54][55] for "lignomic" studies. [56,57] Computational and graphical methods are currently used to elucidate the composition of oligomers.…”

Section: Introductionmentioning

confidence: 99%

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Lignin Depolymerization: A Comparison of Methods to Analyze Monomers and Oligomers

et al. 2020

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Catalytic liquefaction of lignin is an attractive process to produce fuels and chemicals, but it forms a wide range of liquid products from monomers to oligomers. Oligomers represent an important fraction of the products and their analysis is complex. Therefore, rapid characterization methods are needed to screen liquefaction conditions based on the distribution in monomers and oligomers. For this purpose, UV spectroscopy is proposed as a fast and simple method to assess the composition of lignin‐derived liquids. UV absorption and fluorescence were studied on various model compounds and liquefaction products. Liquefaction of Soda lignin was conducted in an autoclave, in ethanol and with Pt/C catalyst (H2, 250 °C, 110 bar). Liquids were sampled at isothermal conditions every 30 min for 4 h. UV fluorescence spectroscopy is related to GC–MS, gel‐permeation chromatography (GPC), MALDI‐TOF MS, and NMR characterizations. A depolymerization index is proposed from UV spectroscopy to rapidly assess the relative distribution of monomers and oligomers.

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Section: Introductionmentioning

confidence: 99%

“…Laser desorption ionization mass spectrometry (LDI–MS) as well as other ionization techniques has been used on lignin and its products for “lignomic” studies . Computational and graphical methods are currently used to elucidate the composition of oligomers .…”

Section: Introductionmentioning

confidence: 99%

Lignin Depolymerization: A Comparison of Methods to Analyze Monomers and Oligomers

et al. 2020

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“…In these studies, the catalysts play a major role in the conversion and the selectivity of the final products. The most widely used catalysts are Pd/C [81,[92][93][94][95][96], Ni/C [93][94][95][96][97], Pt/C [93][94][95]98], Pt/Al 2 O 3 [99], Cu-based porous oxides [100,101], supported NiW and NiMo [102], Ru-based materials [93][94][95][96]103], bimetallic NiM (M = Ru, Rh, Pd) [66], Ni-Au [65,104], WP [105], Ru x Ni 1-x /SBA-15 [106], modified SBA-15 and Al-SBA-15 [107], MoO x /CNT [108], S 2 O 8 2− -KNO 3 /TiO 2 [109]. Another significant parameter in the reductive depolymerization using molecular H 2 is the reaction medium.…”

Section: Depolymerization With External Hydrogen Sourcementioning

confidence: 99%

“…Another significant parameter in the reductive depolymerization using molecular H 2 is the reaction medium. The most widely used solvents are water [104], alcohols [92][93][94][95]97,98,[100][101][102][103]106,107] or mixtures of water with organic compounds [81,99,105] under sub or super-critical conditions. In most cases, the beneficial effect of a hydrogen donor solvent is aimed, as discussed in the following section.…”

Section: Depolymerization With External Hydrogen Sourcementioning

confidence: 99%

Catalytic Transfer Hydrogenolysis Reactions for Lignin Valorization to Fuels and Chemicals

Margellou

Triantafyllidis

2019

Catalysts

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Lignocellulosic biomass is an abundant renewable source of chemicals and fuels. Lignin, one of biomass main structural components being widely available as by-product in the pulp and paper industry and in the process of second generation bioethanol, can provide phenolic and aromatic compounds that can be utilized for the manufacture of a wide variety of polymers, fuels, and other high added value products. The effective depolymerisation of lignin into its primary building blocks remains a challenge with regard to conversion degree and monomers selectivity and stability. This review article focuses on the state of the art in the liquid phase reductive depolymerisation of lignin under relatively mild conditions via catalytic hydrogenolysis/hydrogenation reactions, discussing the effect of lignin type/origin, hydrogen donor solvents, and related transfer hydrogenation or reforming pathways, catalysts, and reaction conditions.

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“…From the perspective of the chemical structure of lignin and its potential applications, it was suggested that lignin can be a great source of valuable aromatic chemicals if the natural lignin could be broken into small molecular units [7]. However, the most difficult aspect of using this technique was that the depolymerization process for such conversions of lignocellulose materials has been very elusive [8].…”

Section: Introductionmentioning

confidence: 99%

High-Efficient and Recyclable Magnetic Separable Catalyst for Catalytic Hydrogenolysis of β-O-4 Linkage in Lignin

Huang

Zhao

2018

Polymers

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Lignin is recognized as a good sustainable material because of its great abundance and potential applications. At present, lignin hydrogenolysis is considered as a potential but challenging way to produce low-molecular-mass aromatic chemicals. The most common linkage between the structural units of lignin polymer is the β-O-4 aryl ether, which are primary or even only target chemical bonds for many degradation processes. Herein, a Pd-Fe3O4 composite was synthesized for catalytic hydrogenolysis of β-O-4 bond in lignin. The synthesized catalyst was characterized by XRD, XPS, and SEM and the lignin depolymerization products were analyzed by GC-MS. The catalyst showed good catalytic performance during the hydrogenolysis process, lignin dimer was degraded into monomers completely and a high yield of monomers was obtained by the hydrogenolysis of bagasse lignin. More importantly, the magnetic catalyst was separated conveniently by magnet after reaction and remained highly catalytically efficient after being reused for five times. This work has demonstrated an efficient & recyclable catalyst for the cleavage of the β-O-4 bond in lignin providing an alternative way to make better use of lignins.

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Hydrogenolysis of lignin over Ru-based catalysts: The role of the ruthenium in a lignin fragmentation process

Cited by 39 publications

References 76 publications

Lignin Depolymerization: A Comparison of Methods to Analyze Monomers and Oligomers

Lignin Depolymerization: A Comparison of Methods to Analyze Monomers and Oligomers

Catalytic Transfer Hydrogenolysis Reactions for Lignin Valorization to Fuels and Chemicals

High-Efficient and Recyclable Magnetic Separable Catalyst for Catalytic Hydrogenolysis of β-O-4 Linkage in Lignin

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