物理化学学报 >> 1998, Vol. 14 >> Issue (12): 1088-1093.doi: 10.3866/PKU.WHXB19981206

研究论文 上一篇    下一篇

双外推法研究FeC2O4·2H2O脱水过程的动力学机理

潘云祥, 管翔颖, 冯增媛, 李秀玉, 阎政   

  1. 天津师范大学化学系，天津 300074
  • 收稿日期:1998-03-02 修回日期:1998-06-23 发布日期:1998-12-15
  • 通讯作者: 潘云祥

Study on the Kinetic Mechanism of the Dehydration Process of FeC2O4·2H2O Using Double Extrapolation

Pan Yun-Xiang, Guan Xiang-Ying, Feng Zeng-Yuan, Li Xiu-Yu, Yan Zheng   

  1. Department of Chemistry,Tianjin Normal University,Tianjin 300074
  • Received:1998-03-02 Revised:1998-06-23 Published:1998-12-15
  • Contact: Pn Yun-Xiang

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摘要：

在Coats-Redfern积分式和Ozawa公式的基础上，采用双外推法对FeC_2O_4•2H_2O脱水过程的最可能机理进行了研究．结果表明其脱水过程分两步进行：第一步脱水过程为成核与生长过程，G（α）函数积分式为[-ln（1-α）]1／1.5；第二步脱水过程为二维扩散过程，G（α）式为（1-α）ln（1-α）＋α；同时求得相应的动力学参数．

关键词: 双外推法, TG-DTA技术, 草酸亚铁二水合物脱水过程, 机理函数

Abstract:

On the basis of the Coats-Redfern's integral equation and Ozawa's equation. the probable mechanism of the dehydration process of FeC2O4 2H2O was investigated using double extrapolation. The dehydration Process includes two steps. The first step is the nuclear producing and growing process(n=1.5), G(α)= [ln(1-α)]1/1.5; the second step is a two-dimensional diffusion process, G(α)=(1-α)ln(1-α)+a: the corresponding kinetic parameters were determined.

Key words: Donble extrapolation, TG-DTA techmique, Dehydration rocess of FeC2O4 2H2O, Mechanism function