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Zeolite‐Assisted Lignin‐First Fractionation of Lignocellulose: Overcoming Lignin Recondensation through Shape‐Selective Catalysis

AbstractOrganosolv pulping releases reactive monomers from both lignin and hemicellulose by 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 stabilizing the reactive monomers (i.e., lignin‐first approaches). To date, all reported approaches rely on the addition of capping agents or metal‐catalyzed stabilization reactions, which usually require high pressures of hydrogen gas. Herein, a metal‐ and additive‐free approach is reported 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 β 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.
Heterogeneous catalysis, QUIMICA ORGANICA, Zeolites, Biomass, Lignin, Depolymerization
Heterogeneous catalysis, QUIMICA ORGANICA, Zeolites, Biomass, Lignin, Depolymerization
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).37 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10% visibility views 121 download downloads 260 - 121views260downloads
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