Catalytic conversion of lignin in woody biomass into phenolic monomers in methanol/water mixtures without external hydrogen

Xianhong Ouyang, Xiaoming Huang (Corresponding author), Jiadong Zhu, Michael Boot, Emiel Hensen (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The valorization of lignin in renewable lignocellulosic biomass is an important target in the transition to a more sustainable production of fuels and chemicals. We present here a modification of the “lignin-first” approach that does not hinge on the use of external hydrogen. Instead, we use methanol/water mixtures as a suitable solvent that can be partly reformed into hydrogen. We propose a one-step process in which in planta lignin (wood sawdust) is converted to phenolic monomers over a Pt-based catalyst in an inert atmosphere. The role of the methanol/water mixture is not only to supply hydrogen but also to extract lignin fragments from the biomass matrix. Pt catalyzes methanol reforming to obtain hydrogen and the stabilization of reactive lignin intermediates by hydrogenation of reactive bonds. The latter aspect is crucial to avoid unfavorable condensation of fragments. Under optimized conditions, a yield of phenolic monomers of nearly 50% can be obtained from birch wood at a temperature of 230 °C in 3 h.
LanguageEnglish
Pages13764-13773
JournalACS Sustainable Chemistry & Engineering
DOIs
StatePublished - 23 Jul 2019

Fingerprint

Lignin
lignin
Methanol
methanol
Hydrogen
Biomass
Monomers
hydrogen
Water
biomass
Wood
water
Sawdust
Hinges
Reforming reactions
Hydrogenation
condensation
Condensation
stabilization
Stabilization

Keywords

  • Aromatics
  • Catalysis
  • Hydrogen
  • Lignin
  • Lignin first
  • Reforming

Cite this

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title = "Catalytic conversion of lignin in woody biomass into phenolic monomers in methanol/water mixtures without external hydrogen",
abstract = "The valorization of lignin in renewable lignocellulosic biomass is an important target in the transition to a more sustainable production of fuels and chemicals. We present here a modification of the “lignin-first” approach that does not hinge on the use of external hydrogen. Instead, we use methanol/water mixtures as a suitable solvent that can be partly reformed into hydrogen. We propose a one-step process in which in planta lignin (wood sawdust) is converted to phenolic monomers over a Pt-based catalyst in an inert atmosphere. The role of the methanol/water mixture is not only to supply hydrogen but also to extract lignin fragments from the biomass matrix. Pt catalyzes methanol reforming to obtain hydrogen and the stabilization of reactive lignin intermediates by hydrogenation of reactive bonds. The latter aspect is crucial to avoid unfavorable condensation of fragments. Under optimized conditions, a yield of phenolic monomers of nearly 50{\%} can be obtained from birch wood at a temperature of 230 °C in 3 h.",
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author = "Xianhong Ouyang and Xiaoming Huang and Jiadong Zhu and Michael Boot and Emiel Hensen",
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AU - Ouyang,Xianhong

AU - Huang,Xiaoming

AU - Zhu,Jiadong

AU - Boot,Michael

AU - Hensen,Emiel

PY - 2019/7/23

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N2 - The valorization of lignin in renewable lignocellulosic biomass is an important target in the transition to a more sustainable production of fuels and chemicals. We present here a modification of the “lignin-first” approach that does not hinge on the use of external hydrogen. Instead, we use methanol/water mixtures as a suitable solvent that can be partly reformed into hydrogen. We propose a one-step process in which in planta lignin (wood sawdust) is converted to phenolic monomers over a Pt-based catalyst in an inert atmosphere. The role of the methanol/water mixture is not only to supply hydrogen but also to extract lignin fragments from the biomass matrix. Pt catalyzes methanol reforming to obtain hydrogen and the stabilization of reactive lignin intermediates by hydrogenation of reactive bonds. The latter aspect is crucial to avoid unfavorable condensation of fragments. Under optimized conditions, a yield of phenolic monomers of nearly 50% can be obtained from birch wood at a temperature of 230 °C in 3 h.

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KW - Aromatics

KW - Catalysis

KW - Hydrogen

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