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Zeolite-assisted lignin-first fractionation of lignocellulose: Overcoming lignin recondensation via shape-selective catalysis
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.ORCID iD: 0000-0001-8735-5397
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Organosolv pulping releases reactive monomers from both lignin and hemicellulose via the cleavage of weak C–O bonds. These monomers recombine to form undesired polymers through the formation of recalcitrant C–C bonds. Different strategies have been developed to prevent this process by stabilising the reactive monomers (i.e., lignin-first approaches). To date, all reported approaches rely on the addition of capping agents or metal-catalysed stabilisation reactions, which usually require high pressures of hydrogen gas. Herein, we report a metal- and additive-free approach that uses zeolites as acid catalysts to convert the reactive monomers into more stable derivatives under organosolv pulping conditions. Experiments with model lignin compounds showed that the recondensation of aldehydes and allylic alcohols produced by the cleavage of β-O-4′ bonds was efficiently inhibited by the use of protonic BETA zeolite. By applying a zeolite with a preferred pore size, the bimolecular reactions of reactive monomers were effectively inhibited, resulting in stable and valuable monophenolics. The developed methodology was further extended to birch wood to yield monophenolic compounds and value-added products from carbohydrates.

Keywords [en]
zeolites, lignin, biomass, shape-selective catalysis
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-179100OAI: oai:DiVA.org:su-179100DiVA, id: diva2:1394233
Available from: 2020-02-18 Created: 2020-02-18 Last updated: 2020-03-05Bibliographically approved
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Subbotina, ElenaSamec, Joseph S. M.
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