Depolymerisation of organosolv lignin by supported Pt metal catalysts

Süss, Raphaela; Aufischer, Gottfried; Zeilerbauer, Lukas; Kamm, Birgit; Meissner, Gisa; Spod, Hendrik; Paulik, Christian

doi:10.1016/j.catcom.2022.106503

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…[10,11] Although lignin is structurally more complex, its higher carbon and lower oxygen content compared to the cellulose or hemicellulose fraction makes it an attractive feedstock to produce biofuels and chemicals. [12][13][14] Meanwhile, a structural profile exists for possible lignin applications. Thus, it can be postulated which application the lignin would be suitable for.…”

Section: Introductionmentioning

confidence: 99%

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Bergrath

Rumpf

Burger

et al. 2023

Macro Materials & Eng

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When optimizing the process parameters of the acidic ethanolic organosolv process, the aim is usually to maximize the delignification and/or lignin purity. However, process parameters such as temperature, time, ethanol and catalyst concentration, respectively, can also be used to vary the structural properties of the obtained organosolv lignin, including the molecular weight and the ratio of aliphatic versus phenolic hydroxyl groups, among others. This review particularly focuses on these influencing factors and establishes a trend analysis between the variation of the process parameters and the effect on lignin structure. Especially when larger data sets are available, as for process temperature and time, correlations between the distribution of depolymerization and condensation reactions are found, which allow direct conclusions on the proportion of lignin's structural features, independent of the diversity of the biomass used. The newfound insights gained from this review can be used to tailor organosolv lignins isolated for a specific application.

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Section: Introductionmentioning

confidence: 99%

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Bergrath

Rumpf

Burger

et al. 2023

Macro Materials & Eng

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show abstract

“…Aiming to successfully address this challenge, it is necessary to upgrade traditional chemical catalysis methods. Novel methods are needed to depolymerize and defunctionalize complex lignin structures as a way to obtain a variety of platform chemicals (Wendisch et al 2018;Süss et al 2022). Because traditional petroleum-based chemicals mainly add functional groups to simple structures, this approach is obviously unreasonable for biomass-based chemical production processes.…”

Section: Introductionmentioning

confidence: 99%

Catalytic hydrogenolysis lignin to obtain phenols: A review of selective cleavage of ether bonds

2023

BioRes

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Lignin depolymerized phenolic compounds and biofuel precursors are ideal value-added products for lignin residues generated in biorefineries and modern paper pulp facilities. Hydrogenolysis of lignin is an efficient depolymerization method for the production of carbon-neutral sustainable fuels and platform chemicals. Lignin is underutilized due to its complex structure, mainly because of its complex interunit linkage crosslinks such as α-O-4, β-O-4, 4-O-5, and β-5. This paper centers on the hydrolysis reaction of three major ether bonds (α-O-4, β-O-4, 4-O-5) in lignin and lignin model compounds based on different catalysts for hydrogenative degradation and catalytic systems. The methods and strategies to inhibit the condensation reactions are summarized. In particular, density functional theory calculation of the reaction pathways are combined with isotopically labeled reaction pathways to deeply analyze the hydrogenation degradation mechanism of biomass and further improve the yield of monophenols during the hydrogenation degradation of lignin. Finally, a brief summary of the challenges and prospects of lignin hydrogenation degradation is proposed.

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Enhancing Hydrogen Production from the Photoreforming of Lignin

Aljohani,

Daly,

Lan

et al. 2023

ChemPlusChem

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Photoreforming of lignocellulose biomass is widely recognised as a challenging but key technology for producing value‐added chemicals and renewable hydrogen (H2). In this study, H2 production from photoreforming of organosolv lignin in a neutral aqueous solution was studied over a 0.1wt.% Pt/TiO2 (P25) catalyst with ultraviolet A (UVA) light. The H2 production from the system employing the lignin (~4.8 µmol gcat−1 h−1) was comparable to that using hydroxylated/methoxylated aromatic model compounds (i.e., guaiacol and phenol, 4.8−6.6 µmol gcat−1 h−1), being significantly lower than that from photoreforming of cellulose (~62.8 µmol gcat−1 h−1). Photoreforming of phenol and reaction intermediates catechol, hydroquinone and benzoquinone were studied to probe the mechanism of phenol oxidation under anaerobic photoreforming conditions with strong adsorption and electron transfer reactions lowering H2 production from the intermediates relative to that from phenol. The issues associated with catalyst poisoning and low photoreforming activity of lignins demonstrated in this paper have been mitigated by implementing a process by which the catalyst was cycled through anaerobic and aerobic conditions. This strategy enabled the periodic regeneration of the photocatalyst resulting in a threefold enhancement in H2 production from the photoreforming of lignin.

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Depolymerisation of organosolv lignin by supported Pt metal catalysts

Cited by 6 publications

References 24 publications

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Catalytic hydrogenolysis lignin to obtain phenols: A review of selective cleavage of ether bonds

Enhancing Hydrogen Production from the Photoreforming of Lignin

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