Abstract
Thermal stability of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) and 1-hexyl-3-methylimidazolium chloride ([HMIM]Cl) ionic liquids was investigated using thermogravimetric analysis (TGA). The long-term isothermal TGA studies have revealed that both the ionic liquids exhibit appreciable decomposition at temperatures significantly lower than indicated by the peak or onset decomposition temperature ( T onset ) determined from fast scan TGA experiments. The long-term thermogravimetric studies of both the ionic liquids showed linear weight loss as a function of time at each temperature of 10 °C interval in the range 150–170 °C over a period of 15 hours. However, the linear weight loss regime decreased with increasing temperature for the range 180–200 °C. The kinetics of isothermal decomposition of ionic liquids was analyzed using pseudo-zero-order rate expression. Arrhenius activation energy for the decomposition of di-alkylimidazolium chloride ionic liquids in the range 150–200 °C was determined.
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