Gold-catalyzed conversion of lignin to low molecular weight aromatics

Song, Y, Mobley, J, Motagamwala, A, Isaacs, M, Dumesic, J, Ralph, J, Lee, A, Wilson, K and Crocker, M 2018, 'Gold-catalyzed conversion of lignin to low molecular weight aromatics', Chemical Science, vol. 9, no. 42, pp. 8127-8133.

Document type: Journal Article
Collection: Journal Articles

Title Gold-catalyzed conversion of lignin to low molecular weight aromatics
Author(s) Song, Y
Mobley, J
Motagamwala, A
Isaacs, M
Dumesic, J
Ralph, J
Lee, A
Wilson, K
Crocker, M
Year 2018
Journal name Chemical Science
Volume number 9
Issue number 42
Start page 8127
End page 8133
Total pages 7
Publisher Royal Society of Chemistry
Abstract A heterogeneous catalyst system, employing Au nanoparticles (NPs) and Li-Al (1:2) layered double hydroxide (LDH) as support, showed excellent activity in aerobic oxidation of the benzylic alcohol group in β-O-4 linked lignin model dimers to the corresponding carbonyl products using molecular oxygen under atmospheric pressure. The synergistic effect between Au NPs and the basic Li-Al LDH support induces further reaction of the oxidized model compounds, facilitating facile cleavage of the β-O-4 linkage. Extension to oxidation of γ-valerolactone (GVL) extracted lignin and kraft lignin using Au/Li-Al LDH under similar conditions produced a range of aromatic monomers in high yield. Hydrolysis of the Au/Li-Al LDH oxidized lignin was found to increase the degree of lignin depolymerization, with monomer yields reaching 40% for GVL extracted lignin. Based on these results, the Au/Li-Al LDH + O2 catalyst system shows potential to be an environmentally friendly means of depolymerizing lignin to low molecular weight aromatics under mild conditions.
Subject Catalysis and Mechanisms of Reactions
DOI - identifier 10.1039/c8sc03208d
Copyright notice © The Royal Society of Chemistry 2018
ISSN 2041-6520
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