肌醇热分解动力学

摘要

采用热重分析法(DTA-TGA)对肌醇的热分解行为及其动力学规律进行了研究。得到氮气气氛升温速率分别为5、10、15、20、25℃⋅min−1下肌醇样品的TGA-DTA曲线。运用Flynn-Wall-Ozawa积分法、Kissinger最大速率法和Šatava-Šesták积分法对实验所得的数据进行处理，计算出肌醇热分解反应的表观活化能为208.03 kJ⋅mol−1；指前因子的对数值lgA=16.76。确定了热分解反应的机理为化学反应，并得到热分解机理函数的积分式G(α)=(1−α)−1−1。%　　The thermal decomposition characteristics and kinetics of inositol were studied by DTA-TGA techniques. The curves of TGA and DTA of inositol at different heating rates (5, 10, 15, 20, 25℃⋅min−1) were acquired in nitrogen atmosphere. The kinetic parameters including the activation energy and pre-exponential factor of the thermal decomposition process for inositol were calculated by Flynn-Wall-Ozawa (FWO), Kissinger andŠatava-Šesták method, respectively. Moreover, the thermal decomposition mechanism of inositol was also studied. Results of this study show that the activation energy was found to be 208.03 kJ⋅mol−1, and logarithmic value of the pre-exponential factor logA was given to be 16.76. According toŠatava-Šesták method, the thermal decomposition mechanism of inositol was thought to be chemical reaction. Integral form of the most probable mechanism function of the decomposition process was obtained to be G(α)=(1−α)−1−1.