物理化学学报 >> 2004, Vol. 20 >> Issue (01): 33-37.doi: 10.3866/PKU.WHXB20040107

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二水草酸锌脱水的热分解动力学研究

张伟南;袁誉洪;李丽清;陈栋华   

  1. 中南民族大学化学与生命科学学院,武汉　430074
  • 收稿日期:2003-06-11 修回日期:2003-08-29 发布日期:2004-01-15
  • 通讯作者: 陈栋华 E-mail:chendh46@sina.com

A Description of Thermal Decomposition Kinetics of Dehydration of Zinc Oxalate Dihydrate

Zhang Wei-Nan;Yuan Yu-Hong;Li Li-Qing;Chen Dong-Hua   

  1. College of Chemistry and Life Science, South-Central University for Nationalities, Wuhan　430074
  • Received:2003-06-11 Revised:2003-08-29 Published:2004-01-15
  • Contact: Chen Dong-Hua E-mail:chendh46@sina.com

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摘要： 提出一种多升温速率-等温法确定机理函数g(α)的新方法;并用迭代的等转化率法求出较为可靠的活化能Ea;在Ea和g(α)的基础上计算出指前因子A.用该法对二水草酸锌（ZnC2O4•2H2O）脱水反应的热分解动力学三因子进行了求算,得出Ea为87.22 kJ•mol－1, A为4.2120×108～7.2328×108 s－1;以及随机成核和随后生长型机理函数Am（Avrami-Erofeer）,其积分形式g(α)=[－ln(1－α)] 1/m和微分形式f(α)=m(1－α)•[－ln(1－α)](1－1/m),调节因子m=1.85～2.00.

关键词: 多升温速率-等温法, 等转化率法, 非等温动力学, 二水草酸锌, 调节函数

Abstract: A new method of the multiple rates-isotemperature is proposed to define the most possible mechanism g(α) of thermal decomposition; the iterative isoconversional procedure has been employed to estimate apparent activation energy Ea; the pre-exponential factor A is obtained on the basis of Ea and g(α).By this new method, the thermal analysis kinetic triplet of dehydration of zinc oxalate dihydrate is determined, where apparent activation energy Ea is 87.22 kJ•mol－1; pre-exponential factor A is 4.2120×108～7.2328×108 s－1 and the most probable mechanism belongs to random nucleation and growth Am (Avrami-Erofeer equation) ,with integral form g(α)=[－ln(1－α)] 1/m, and differential form f(α)=m(1－α)•[－ln(1－α)](1－1/m) , accommodation factor m=1.85～2.00.

Key words: Multiple rates-isotemperature method, Isoconversional method, Non-isothemal kinetics, Zinc oxalate dihydrate, Accommodation function