Depolymerisation–hydrogenation of condensed tannins as a strategy for generating flavan-3-ol monomers

Vangeel, Thijs; Smets, Ruben; Borght, Mik Van Der; Sels, Bert F.

doi:10.1039/d2gc04470f

Cited by 3 publications

References 46 publications

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Preparation of palladium‐based catalysts and use for depolymerization of larch bark tannins

Liu,

Li,

Zhang

et al. 2024

Asia-Pacific J Chem Eng

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In this study, we synthesized eight palladium‐based catalysts using two carriers, ZrO2 and MCM‐41. These catalysts were used for the degradation of condensed tannins extracted from larch bark. The average polymerization degree and degradation rate of the products were used as indicators to evaluate the efficiency of degradation. The effects of different Pd:Cu loading ratios under the same carrier conditions and the effects of different carriers under the same Pd:Cu loading ratio were investigated. The results revealed that when the carrier was kept constant, the Pd:Cu ratio of 1:1 exhibited the highest efficiency in degrading condensed tannins. Moreover, when the Pd:Cu loading ratio was the same, the degradation efficiency was higher when ZrO2 was used as the carrier. Based on these findings, the catalyst (Pd1‐Cu1)5/ZrO2 (where “1” are the molar ratios of Pd to Cu added during the preparation of the catalyst and where ‘5’ is the mass percentage of Pd/Cu metal to total catalyst, i.e., 5 wt%), with ZrO2 as the carrier and a Pd:Cu ratio of 1:1, demonstrated the highest degradation efficiency, with a degradation rate of 73.89%. This catalyst successfully reduced the average polymerization degree of condensed tannins from 9.5 to 2.48.

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Preparation of palladium‐based catalysts and use for depolymerization of larch bark tannins

Liu,

Li,

Zhang

et al. 2024

Asia-Pacific J Chem Eng

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Toward sustainable upgrading of bark

Neiva,

Ek,

Sels

et al. 2024

Chem Catalysis

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Oxidative Valorization of Spruce Bark to Yield Vanillin

Samec,

Muangmeesri,

Lebedeva

et al. 2024

Preprint

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A competitive and environmentally sustainable biorefinery should valorize all parts of biomass, including bark. Currently, bark, which constitutes 10 wt% of timber and pulp wood, is burned at a low value. Softwood bark comprises 38% lignin, suggesting that this component could be an important source of valuable aromatic compounds; this lignin also contains substantial amounts of interlinkages with strong C–C bonds, such as β-5 linkages, which are not cleaved during standard depolymerization methods. In contrast to wood lignin which is linear, bark lignin appears to be cyclic, which further hinders depolymerization. Here, we present a method using oxygen to oxidatively depolymerize spruce bark lignin to yield valuable monophenols at 30-fold higher levels than expected from nitrobenzene oxidation. This is an important step in making biorefineries more sustainable and competitive and a new source to green vanillin.

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Depolymerisation–hydrogenation of condensed tannins as a strategy for generating flavan-3-ol monomers

Abstract: Flavan-3-ol monomers are interesting, functionalised phenolic building blocks. Here, a strategy is presented for producing these flavan-3-ol monomers, starting from condensed tannins present in biomass waste streams such as tree...

Cited by 3 publications

References 46 publications

Preparation of palladium‐based catalysts and use for depolymerization of larch bark tannins

Preparation of palladium‐based catalysts and use for depolymerization of larch bark tannins

Toward sustainable upgrading of bark

Oxidative Valorization of Spruce Bark to Yield Vanillin

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