Abstract
AbstractThermo‐oxidative stability of ionic liquids was evaluated by three bulk‐scale tests. The changes in chemical and physical properties such as viscosity, deposit formation, weight loss and TAN were obtained. The results are discussed in terms of chemical structure of ionic liquids. TFSI derivatives exhibit good thermo‐oxidative stability in comparison with BF4 derivatives. As chain length of alkyl group in imidazolium‐cationic moiety increases, the thermo‐oxidative stability of the molecule decreases. Water contaminant promotes the thermo‐oxidative degradation of ionic liquids. Reaction mechanism via radical intermediates is proposed herein. Copyright © 2007 John Wiley & Sons, Ltd.
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