Confined rapid thermolysis/FTIR/ToF studies of imidazolium-based ionic liquids

被引:126
作者
Chowdhury, A [1 ]
Thynell, ST [1 ]
机构
[1] Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA
关键词
ionic liquids; thermal decomposition; FTIR spectroscopy; ToF mass spectrometry;
D O I
10.1016/j.tca.2006.01.006
中图分类号
O414.1 [热力学];
学科分类号
摘要
Rapid scan FTIR spectroscopy and time-of-flight (ToF) mass spectrometry were utilized to study thermal decomposition of three imidazolium-based ionic liquids, with 1-ethyl-3-methyl-imidazolium (emim) as the cation, and NO3-, Cl-, and Br- as the anions. The thermal decomposition involved heating rates of 2000 K/s and temperatures to 435 degrees C in an ambient inert gas at 1 atm. Using sub-milligram quantities of each compound, examinations of the evolution of gas-phase species revealed that the most probable sites for proton transfer and subsequent secondary reactions were primarily the methyl group and secondarily the ethyl group. The ring appeared to remain intact, as there was no evidence of the formation of HCN, imines or related products. The most reactive compound is [emim]NO3, since the nitrate group served as a strong oxidizer and reacted strongly with the methyl/ethyl groups at the elevated temperatures to produce common final products from combustion. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:159 / 172
页数:14
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