摘要
用等温热重法和非等温热重法研究了Co(CH3COO)2·4H2O的脱水反应.在51.4℃、55.9℃、59.6℃、61.4℃下的等温热重数据由等转化率下的Int=E/RT+1n[g(α)/A]进行拟合确定了活化能的大小;升温速率为10℃/min的非等温热重曲线显示Co(CH3COO)2·4H2O的脱水反应发生在55.1~100.2℃,其数据通过Doyle-Zsako法进行拟合.以线性相关系数为判据并结合等温热分析拟合结果,得到该脱水反应的非等温积分动力学模式函数g(α)=1-(1-α)^1/2,相应的动力学方程是dn/dt=Aexp(-E/RT)·2·(1-α)^1/2.活化能E=74.16kJ·mol^-1,指前因子Ig[A/s^-1]=11.48.
The dehydration of Co(CHaCOO)2 4H2O has been studied isothermally and non-isothermally using TG method. The isothermal TG studies were carried out at the temperature of 51.4 ℃、55.9 ℃. 59.6 ℃ .61.4 ℃. The activation energy was obtained by means of lnt = E/RT + ln[g((α)/A] using the data at the same conversion rate α. Non-isothermal experiment was carried out at a rate of 10 ℃/min in 40 mL N2/min, Co(CH3COO)2 · 4H2O dehydrated at 55.1~100.2 ℃. The data from non-isothermal experiment were analyzed by Doyle-Zsako method. Combined with the isothermal results, it was found that the integral kinetic function of the dehydration of Co(CH3COO)2 · 4H2O g(α) = 1 - (1 -(α)^1/2 , the kinetic equation dα/dt = Aexp(-E/RT) · 2 · (1-α)^1/2 , the aetivation energy E =74.16 kJ/mol, and the pre exponential factor lg[A/s^-1] = 11.48 .
基金
安徽省教育厅科研基金资助项目(2004kj044)