Thermo-oxidative stability of ionic liquids was evaluated by three bulk-scale tests. The changes of chemical and physical properties such as viscosity, deposit formation, weight loss and total acid number were obtained. The results are discussed in terms of chemical structure of ionic liquids. Bis(trifluoro- methylsulfonyl)imide derivatives exhibit good thermo- thermooxidative oxidative stability in comparison with tetrafluoroborate derivatives. As chain length of alkyl group in imidazolium-cationic moiety increases, the thermo-oxidative stability of the molecule decreases. Wwater contaminant promotes the thermo-oxidative degradation of ionic liquids.
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