Thermal decomposition onset temperatures have been measured for a total of 24 methylimidazolium, triethanolammonium, and pyridinium type sulfonic acid groups functionalized Brönsted acidic ionic liquids with Cl−, Br−, SO42−, PO43−, BF4−, CH3CO2−, and CH3SO3− anions, using thermogravimetric analysis. Thermal stabilities of these sulfonic acid group functionalized ionic liquids decreases in the order, methylimidazolium > triethanolammonium > pyridinium. The methylimidazolium, pyridinium, and triethanolammonium ionic liquids investigated showed decomposition onset temperatures (air) in the 213–353, 167–240, and 230–307 °C ranges, respectively. Additionally, the decomposition temperatures of these ionic liquids are highly dependent on the nature of the anion.
Acidic ionic liquids Thermal stability TG DTG
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Authors would like to thank Center for Environmentally Beneficial Catalysis (CEBC), University of Kansas, American Chemical Society-PRF grant UR1-49436 and NSF grant CBET-0929970 for financial support.
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