Journal
CHEMICAL SCIENCE
Volume 9, Issue 42, Pages 8127-8133Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc03208d
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Funding
- National Science Foundation [1355438]
- Global Bioenergy, Biofuels, and Biorefining network (GB3-Net) - British Council
- Department for Business, Innovation and Skills (BIS)
- DOE Great Lakes Bioenergy Research Center (DOE Office of Science) [BER DE-FC02-07ER64494, DE-SC0018409]
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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 beta-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 beta-O-4 linkage. Extension to oxidation of gamma-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 + O-2 catalyst system shows potential to be an environmentally friendly means of depolymerizing lignin to low molecular weight aromatics under mild conditions.
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