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为考察离子液体对煤氧化反应动力学的影响,利用热分析实验所得放热速率结果计算了未处理煤和各种离子液体处理煤的平均活化能E和指前因子A。根据活化能随温度的变化趋势,分析发现:[AOEmim]BF4、[Amim]Cl、[Emim]AC 3种离子液体处理煤在低温段的化学反应速率比未处理煤快,其余离子液体处理煤的反应活性均降低。所用离子液体能够降低煤活化过程对温度的敏感性。[Bmim]OTf离子液体处理煤活化能较高,而且对温度的敏感度较低,活化过程较迟钝,因此推测[Bmim]OTf对煤的氧化反应动力起到一定的抑制作用。
In order to investigate the effect of ionic liquid on the kinetics of coal oxidation, the average activation energy E and pre-exponential factor A of untreated coal and various ionic liquid-treated coal were calculated based on the exothermic rate of thermal analysis. According to the change tendency of activation energy with temperature, it was found that the chemical reaction rates of [AOEmim] BF4, [Amim] Cl, [Emim] AC three kinds of ionic liquids were faster than that of untreated coal at low temperature, The reactivity decreased. The ionic liquids used reduce the temperature sensitivity of coal activation. [Bmim] OTf ionic liquid treated coal has higher activation energy, lower sensitivity to temperature and slower activation process. Therefore, it is presumed that [Bmim] OTf can restrain the kinetic of coal oxidation.