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β-Zeolite-Assisted Lignin-First Fractionation in a Flow-Through Reactor*.

Alexei Kramarenko1, Deniz Etit1, Gabriele Laudadio1,2

  • 1Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Het Kranenveld 14, 5612 AZ, Eindhoven, The Netherlands.

Chemsuschem
|July 14, 2021
PubMed
Summary

This study presents a one-step catalytic process for woody biomass fractionation using β-zeolite, yielding aromatic monomers. The process efficiency is influenced by reaction conditions and catalyst stability, offering a sustainable route for biomass valorization.

Keywords:
depolymerizationflow-throughligninlignocellulosezeolites

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Area of Science:

  • Biomass Conversion
  • Catalysis
  • Green Chemistry

Background:

  • Lignocellulosic biomass is an abundant renewable resource.
  • Efficient fractionation is key to unlocking its potential for producing valuable chemicals.
  • Current methods often require harsh conditions or multiple steps.

Purpose of the Study:

  • To develop a hydrogen-free, one-step catalytic fractionation of woody biomass.
  • To investigate the role of β-zeolite as a bifunctional catalyst.
  • To analyze the factors affecting aromatic monomer production and catalyst stability.

Main Methods:

  • Catalytic fractionation of birch, spruce, and walnut shells using commercial β-zeolite in a flow-through reactor.
  • Rate-limiting step analysis with varying reactor configurations.
  • Investigation of oxalic acid co-feeding effects.
  • Zeolite characterization and recycling to assess stability.

Main Results:

  • β-Zeolite effectively fractionated biomass, cleaving lignin linkages and preventing repolymerization.
  • Aromatic monomer production was governed by a mixed regime of solvolysis and zeolite catalysis.
  • Oxalic acid enhanced yields at moderate concentrations but degraded the zeolite at higher levels.
  • Catalyst deactivation occurred via coking and leaching, impacting pore structure and acidity.

Conclusions:

  • The one-step catalytic fractionation using β-zeolite is a promising method for biomass valorization.
  • Understanding reaction kinetics and catalyst stability is crucial for process optimization.
  • Careful control of co-additives like oxalic acid is necessary to maintain catalyst performance.