Catalytic Hydrolytic Cleavage and Oxy-Cleavage of Lignin Linkages
In this work, new strategies involving organic bases were evaluated to depolymerize lignin to reduced molecular fragments in aqueous medium. NaOH as an inorganic base was also investigated as a reference. Full nature lignin samples are used for the study. As research tools to unravel the complexity of the macro lignin structure and bulky molecular size under this study, size exclusion chromatography and high resolution mass spectrometric analysis, typically used for protein characterizations, were used to follow the progress of lignin depolymerisation by measuring the molecular weight distribution of the products and determining the key molecular fingerprints, respectively. The results show that sodium phenoxide and guanidine carbonate are effective catalysts for lignin depolymerization. It is observed that there exists a synergism between H2O2 and the organic base, which is strongest with guanidine carbonate.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1132683
- Report Number(s):
- PNNL-SA-97973; 28793
- Journal Information:
- Journal of Molecular Catalysis. A, Chemical., 388-389:35-40, Journal Name: Journal of Molecular Catalysis. A, Chemical., 388-389:35-40
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanistic Investigation of Acid-Catalyzed Cleavage of Aryl-Ether Linkages: Implications for Lignin Depolymerization
Nucleophilic Thiols Reductively Cleave Ether Linkages in Lignin Model Polymers and Lignin