期刊
BIOMASS & BIOENERGY
卷 33, 期 9, 页码 1122-1130出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2009.03.006
关键词
Biomass; Lignin; Ionic liquid; Dealkylation; Phenols; Acid catalysis; 2-Methoxyphenol; Renewable
资金
- Air Force Office of Scientific Research
- NSF Graduate Research Fellowship
- Laboratory Directed Research and Development Program at the Pacific Northwest National Laboratory (PNNL)
- U.S. Department of Energy [DE-AC06-76RL01830]
Lignin, a readily available form of biomass, is a potential source of renewable aromatic chemicals through catalytic conversion. Recent work has demonstrated that ionic liquids are excellent solvents for processing woody biomass and lignin. Seeking to exploit ionic liquids as media for depolymerization of lignin, we investigated reactions of lignin model compounds in these solvents. Using Bronsted acid catalysts in 1-ethyl-3-methyl-imidazolium triflate at moderate temperatures below 200 degrees C, we obtained up to 11.6% molar yield of the dealkylation product 2-methoxyphenol from the model compound 2-methoxy-4-(2-propenyl)phenol and cleaved 2-phenylethyl phenyl ether, a model for lignin ethers. Despite these successes, acid catalysis failed in dealkylation of the saturated-chain model compound 4-ethyl-2-methoxyphenol and did not produce monomeric products from organosolv lignin, demonstrating that further work is required to understand the complex chemistry of lignin depolymerization. (C) 2009 Published by Elsevier Ltd.
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