(216h) Depolymerization of Lignin to Mono-Aromatic Compounds over Solid Acid Catalysts with Hydrogen
- Conference: AIChE Annual Meeting
- Year: 2018
- Proceeding: 2018 AIChE Annual Meeting
- Group: Topical Conference: Innovations of Green Process Engineering for Sustainable Energy and Environment
- Time: Monday, October 29, 2018 - 5:15pm-5:30pm
Depolymerization of lignin to high yield aromatic compounds for production of fuels and chemicals is vital for an economically competitive biorefinery. In this study, we report a catalytic process involving acidic zeolite with hydrogen under mild conditions in water for cleaving C-O-C linkages to hydrolyze the dilute alkali extracted corn stover lignin to aromatic monomeric compounds with high yield (> 82.4% wt/wt). Results showed that the depolymerization of alkali lignin to mono-aromatic compounds was promoted by the amount of acid sites present on the zeolite and, therefore, lower silica-alumina ratio zeolites were preferred. For both alkali lignin and the Î²-O-4 model compound, series of reactions, including hydrolysis, dehydraration, and decarbonylation, were proposed and confirmed by computational simulation. In addition, C-C bond coupling reaction was also observed in the Î²-O-4 model compound under the same conditions.