摘要
用等温热重法和非等温热重法研究了Zn(CH3COO) 2·2H2 O的脱水反应 .在 61.1、62 .8、66.2、69.9℃下的等温热重数据 ,由等转化率下的lnt=E/RT +ln[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 ,Zn(CH3COO) 2·2H2 O的脱水反应发生在 71～ 10 2℃间 ,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 ,得到该脱水反应的积分动力学模式函数g(α) =[-ln( 1-α) ]2 / 3、活化能E =10 0 .8kJ/mol、指前因子ln(A/s-1) =3 6.0 9、动力学补偿效应方程为lnA =0 .3 3 3 9E + 2 .0 10 .
The dehydration of Zn(CH 3COO) 2·2H 2O has been studied isothermally and nonisothermally using TG method. The isothermal TG studies were carried out at the temperature of 61.1, 62.8, 66.2, 69.9℃. The activation energy was obtained by means of the lnt=E/RT+ln\ using the data at the same conversion rate α. Nonisothermal experiment was carried out at a rate of 10℃/min in 40 mL/min N 2, Zn(CH 3COO) 2·2H 2O dehydrated at 71～102℃. The data from nonisothermal experiment were analyzed by Doyle-Zsako method.Combined with the isothermal results the integral kinetic function g(α)=\[-ln(1-α)\] 2/3 of the dehydration of Zn(CH 3COO) 2·2H 2O activation energy 100.8 kJ/mol, preexponential factor ln(A/s -1)=36.09 and the kinetic compensation effect equation lnA=0.3339E+2.010 were found.
基金
安徽省教育厅自然科学基金资金资助项目 ( 99j10 0 3 3 )
