Thermal stability and kinetic study of benzimidazolium based ionic liquid

摘要

3-methyl-l-(4-sulfo-butyl)-benzimidazolium trifluoromethanesulfonate [BSMBnM][CF3SO3] as a new ionic liquid (IL) was synthesized and their structure was-confirmed by NMR, FTIR and CHNS technique. The IL thermal stability is of the great significance for their applications. This IL thermal stability was investigated by TGA from 373.15-873.15 K with different heating rates (10, 15 and 20°C). The activation energy and pre-exponential factor were also evaluated using Kissinger (171.01 KJ/mol and 9.88×10~(12) min~(-1)), Ozawa (172.60 KJ/mol and 13.76 × 10~(12) min~(-1)) and Starink (171.30 KJ/mol and 10.50 × 10~(12) min~(-1)) methods, respectively.