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Metal-catalyzed depolymerization
Isaac November
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Outline Brief background of lignin
Industrial scale processes for lignin depolymerization Pd and Ru catalyzed depolymerization Base-catalyzed depolymerization Conclusions
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Schematic structure of lignocellulose
Deepa et al., ACS Catalysis, 2015, 5,
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Lignin monomers Deepa et al., ACS Catalysis, 2015, 5,
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Proposed Structure of Lignin
Complex structure Composes ~15-40% of lignocellulosic biomass 2nd most abundant natural polymer Deepa et al., ACS Catalysis, 2015, 5,
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Lignin Application Deepa et al., ACS Catalysis, 2015, 5,
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Industrial scale processes of lignin depolymerization
Noguchi process ( ) Crown-Zellerbach process (1966) Lignol process ( ) H.H.Nimz, Elsevier,1986,67-68
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Ruthenium catalyzed mechanism
Kishimoto, T et al.,Org. Biomol. Chem. 2005, 3, 1067
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Palladium catalyzed mechanism
Kishimoto, T et al.,Org. Biomol. Chem. 2005, 3, 1067
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Base-catalyzed lignin depolymerisation
J.M. Lavoie at al.,Bioresource Tech., 2011,102,
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Conclusions Metal catalyzed depolymerization is cost-effective, highly selective and sustainable. Base catalyzed requires harsh reaction conditions which results in high costs of facility and handling.
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