Journal
CHEMSUSCHEM
Volume 9, Issue 23, Pages 3262-3267Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201601252
Keywords
biomass; catalysis; extraction; lignin; metal triflate
Funding
- New Energy House project of the Eindhoven Energy Institute
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Adding value to lignin, the most complex and recalcitrant fraction in lignocellulosic biomass, is highly relevant to cost-efficient operation of biorefineries. We report the use of homogeneous metal triflates to rapidly release lignin from biomass. Combined with metal-catalyzed hydrogenolysis, the process separates woody biomass into few lignin-derived alkylmethoxyphenols and cellulose under mild conditions. Model compound studies show the unique catalytic properties of metal triflates in cleaving lignin-carbohydrate interlinkages. The lignin fragments can then be disassembled by hydrogenolysis. The tandem process is flexible and allows obtaining good aromatic monomer yields from different woods (36-48 wt%, lignin base). The cellulose-rich residue is an ideal feedstock for established biorefining processes. The highly productive strategy is characterized by short reaction times, low metal triflate catalyst requirement, and leaving cellulose largely untouched.
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