升温速率对β-CD/1-MCP热分解反应动力学的影响

Effect of Temperature Rising Rate on Thermolysis Reaction Kinetics of β-CD/1-MCP

用程序升温热重法对-βCD与1-MCP包结物的热分解动力学进行了研究,考察了升温速率对TG/DTG谱图的影响,并用单一升温速率法和多个升温速率组合法分别作了动力学分析.结果表明:动力学参数(Tm和(dα/dT)m)均随着升温速率的升高而增大,两种计算方法得到的动力学参数是不同的,单一升温速率法计算出的E和A值遵循关系式:lnA=0.1059E+1.013,即存在动力学补偿效应;多个升温速率组合法对E的计算,则依赖于升温速率的组合.

The inclusion complexes of β-CD and 1-MCP were studied by temperature-programmed themogravimetry, from which the TG/DGT spectra were obtain at a temperature rising rate 10-40 K/min. The DTG parameters, Tm and （dα/ dT）m, and kinetic parameters were calculated from Freeman-Carroll method and Kissinger method, respectively, both were affected by temperature rising rate. The results showed that the thermal kinetic parameters Tm and （dα/dT）m increase linearly with the rate. From the results by Freeman-Carroll method, it can be found that there is a ＂kinetic compensation effect＂ which reveals a linear relationship： lnA = 0. 105 9E ＋ 1.013. However, if by Kissinger method, several temperature rising rates are used to calculate the activation energy depending on how to combine these rates together.