Journal
CHEMSUSCHEM
Volume 12, Issue 2, Pages 404-408Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201802497
Keywords
biomass fractionation; birch wood; cobalt; heterogeneous catalysis; lignin
Funding
- Swedish Energy Agency
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Herein, a catalytic reductive fractionation of lignocellulose is presented using a heterogeneous cobalt catalyst and formic acid or formate as a hydrogen donor. The catalytic reductive fractionation of untreated birch wood yields monophenolic compounds in up to 34 wt % yield of total lignin, which corresponds to 76% of the theoretical maximum yield. Model compound studies revealed that the main role of the cobalt catalyst is to stabilize the reactive intermediates formed during the organosolv pulping by transfer hydrogenation and hydrogenolysis reactions. Additionally, the cobalt catalyst is responsible for depolymerization reactions of lignin fragments through transfer hydrogenolysis reactions, which target the beta-O-4' bond. The catalyst could be recycled three times with only negligible decrease in efficiency, showing the robustness of the system.
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