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首页> 外文期刊>Journal of thermal analysis and calorimetry >Isoconversional kinetic analysis of thermal decomposition of 1-butyl-3-methylimidazolium hexafluorophosphate under inert nitrogen and oxidative air atmospheres
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Isoconversional kinetic analysis of thermal decomposition of 1-butyl-3-methylimidazolium hexafluorophosphate under inert nitrogen and oxidative air atmospheres

机译：惰性氮和氧化空气大气下的1-丁基-3-甲基咪唑鎓六氟磷酸铝的热分解的同焦型动力学分析

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摘要

Non-isothermal decomposition of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6) in inert nitrogen and air atmospheres was investigated by means of multiple heating-rate thermogravimetric analysis. The results obtained under the heating rates of 5-20 K min(-1) show that the [bmim]PF6 pyrolysis mainly occurred from 600 to 800 K and its oxidative thermal decomposition mainly from 550 to 750 K. Kinetic thermal decomposition processes have been analyzed with differential Friedman method and three integral Flynn-Wall-Ozawa, Coats-Redfern and Vyazovkin-Dollimore methods. Through these model-free isoconversional methods, the activation energy and pre-exponential factor over the entire conversion range have been successfully estimated. By using the Coats-Redfern method, the diffusion-controlled D5 model is found to be the best reaction mechanism function for describing two-stage pyrolysis and one-stage oxidative thermal decomposition and leads to very satisfactory calculation performances. The short-term stability and long-term thermal stability are discussed as well.
机译：通过多重加热速率热重分析研究了惰性氮气和空气气氛中的1-丁基-3-甲基咪唑鎓六氟磷酸钡（αpF6）的非等温分解。在5-20kmin（-1）的加热速率下获得的结果表明，[Bmim] pF6热解主要为600-800k，其氧化热分解主要是550至750k.动力学分解过程用差异弗里德曼方法分析，三个整体飞蝇壁，涂层 - Redernn和Vyazovkin-Dollimore方法。通过这些无模型的异组方法，已成功估计了整个转换范围内的激活能量和预指数因子。通过使用涂层 - 铁丝法，发现扩散控制的D5模型是用于描述两级热解和一级氧化热分解的最佳反应机制功能，并导致非常令人满意的计算性能。还讨论了短期稳定性和长期热稳定性。

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