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Reaction Pathways and Mechanisms in Thermocatalytic Biomass Conversion II pp 131–144Cite as

Oxidation of Lignins and Mechanistic Considerations

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Part of the book series: Green Chemistry and Sustainable Technology ((GCST))

Abstract

Oxidation of Acetosolv and Organosolv lignins and model dimers was performed with O2 and Co/Mn/Br catalyst. Evidence for the mechanisms was obtained by analyzing the monomeric and macromolecular products. The oxidation yielded 30–40 % of oxidized lignin containing 7–41 % more oxygenated groups than the original lignin, as evaluated by analytical pyrolysis. Kinetic data showed that oxidation of lignin is a pseudo-first-order reaction with the following rate constants for the formation of the oxidation products: 3.2 × 10−2 min−1 (Organosolv), 1.0 × 10−3–9.5 × 10−3 min−1 (Acetosolv), and 4.3 × 10−3–1.6 × 10−1 min−1 (model dimers). Oxidized lignins have chelating capacity for removing heavy metals from industrial effluents.

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Acknowledgments

This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP – grants 95/7490-3, 95/9872-0, 96/12306-0, 00/00637-9), Deutscher Akademischer Austauschdienst (DAAD), National Brazilian Research Council (CNPq), and Fundação Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Authors and Affiliations

  1. Pontifícia Universidade Católica de Campinas, PUCCAMP, Campinas, SP, Brazil

    Adilson R. Gonçalves

  2. Instituto Agronômico de Campinas, Campinas, SP, Brazil

    Priscila Benar

  3. Instituto de Química – UNICAMP, Campinas, SP, Brazil

    Ulf Schuchardt

Authors
  1. Adilson R. Gonçalves
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  2. Priscila Benar
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  3. Ulf Schuchardt
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Correspondence to Ulf Schuchardt .

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Editors and Affiliations

  1. The Guelph-Waterloo-Centre for Graduate Work in Chemistry (GWC)2, Department of Chemistry, University of Guelph, Guelph, Ontario, Canada

    Marcel Schlaf

  2. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Dalian, China

    Z. Conrad Zhang

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Gonçalves, A.R., Benar, P., Schuchardt, U. (2016). Oxidation of Lignins and Mechanistic Considerations. In: Schlaf, M., Zhang, Z. (eds) Reaction Pathways and Mechanisms in Thermocatalytic Biomass Conversion II. Green Chemistry and Sustainable Technology. Springer, Singapore. https://doi.org/10.1007/978-981-287-769-7_7

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  • DOI: https://doi.org/10.1007/978-981-287-769-7_7

  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-287-768-0

  • Online ISBN: 978-981-287-769-7

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