Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 5, Pages 1356-1360Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201710838
Keywords
biomass; depolymerization; heterogeneous catalysis; hydrogenolysis; lignin
Categories
Funding
- Swiss Competence Center for Energy Research: Biomass for a Swiss Energy Future through the Swiss Commission for Technology and Innovation [KTI.2014.0116]
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Protection groups were introduced during biomass pretreatment to stabilize lignin's ,-diol group during its extraction and prevent its condensation. Acetaldehyde and propionaldehyde stabilized the ,-diol without any aromatic ring alkylation, which significantly increased final product selectivity. The subsequent hydrogenolysis catalyzed by Pd/C generated lignin monomers at near-theoretical yields based on Klason lignin (48% from birch, 20% from spruce, 70% from high-syringyl transgenic poplar), and with high selectivity to a single 4-n-propanolsyringol product (80%) in the case of the poplar. Unlike direct hydrogenation of native wood, hydrogenolysis of protected lignin with Ni/C also led to high selectivity to this single product (78%), paving the way to high-selectivity lignin upgrading with base metal catalysts. The use of extracted lignin facilitated valorization of polysaccharides, leading to high yields of all three major biomass polymers to a single major product.
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