Journal
POLYMER DEGRADATION AND STABILITY
Volume 96, Issue 4, Pages 426-431Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.01.011
Keywords
Biomass; Catalytic degradation; Ionic liquids; Lignin
Categories
Funding
- NSF [CBET 0849342]
- China Scholarship Council for postgraduates
- Program of Introducing Talents of Discipline to Universities
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Ionic liquids based on the 1-methylimidazolium cation with chloride, bromide, hydrogen sulfate, and tetrafluoroborate counterions along with 1-butyl-3-methylimidazolium hydrogen sulfate were employed to degrade two lignin model compounds, guaiacylglycerol-beta-guaiacyl ether and veratrylglycerol-beta-guaiacyl ether. The acidity of each ionic liquid was approximated using 3-nitroaniline as an indicator to measure the Hammett acidity (H-0). While all of the tested ionic liquids were strongly acidic (Ho between 1.48 and 2.08), the relative acidity did not correlate with the ability of the ionic liquid to catalyze beta-O-4 ether bond hydrolysis. The reactivity of the model compounds in the ionic liquids is dependent not only on the acidity, but also on the nature of the ions and their interaction with the model compounds. (C) 2011 Elsevier Ltd. All rights reserved.
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