高等学校化学学报

高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (5): 739.

• 论文 • 上一篇    下一篇

硫脲氧化的非线性动力学研究──H2O2-SC(NH2)2-Cu2+

林娟娟, 高庆宇, 马克勤, 汪跃民, 赵学庄   

  1. 南开大学化学系, 天津 300071
  • 收稿日期:1995-07-03 出版日期:1996-05-24 发布日期:1996-05-24
  • 通讯作者: 赵学庄
  • 作者简介:林娟娟,女,35岁,讲师,温州师范学院访问学者.
  • 基金资助:

    国家自然科学基金

Studies on Nonlinear Kinetics for Thiourea Oxidation──H2O2-SC(NH2)2-CU2+)Reaction System

LIN Juan-Juan, GAO Qing-Yu, MA Ke-Qin, WANG Yue-Min, ZHAO Xue-Zhuang   

  1. Department of Chemistry, Nankai University, Tianjin 300071
  • Received:1995-07-03 Online:1996-05-24 Published:1996-05-24

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摘要： 研究了H2O2-SC(NH2)2-Cu2+-H+反应体系在封闭条件下以及在CSTR中的振荡行为。体系在封闭条件下出现单峰振荡行为,其振幅和诱导期与反应温度、[H2O2]、[SC(NH2)2]等有关,在CSTR中体系的Pt电极电位、铜离子选择性电极电位以及pH值均显示稳定的周期性振荡;考察其振荡过程的流速序列,发现在低流速下出现周期性复杂振荡,体系没有双稳态出现。

关键词: 化学振荡, 硫脲, 过氧化氢

Abstract: The reaction between hydrogen peroxide and thiourea in acidic medium(HCLO4) catalyzed by Cu2+) has been studied both in a closed(batch) system and in a flow reactor (CSTR).Anew thiourea oscillator has been found.Under the batch condition the reaction displays single-peak oscillation behavior in the redox potential.Amplitude and induction time of the reaction vary as the initial reactant concentrations and the temperature of reaction.This induction time could be reduced by higher initial hydrogen peroxide concentrations and lower initial thiourea concentrations.In the CSTR, the reaction system displays sustained periodic oscillations in the potentials of Pt electrode and Cu2+)-selective electrode and pHelectrode, As the flow rate is decreased, complex oscillations appear.The oscillatory region is shown in phase diagrams.The oscillation behavior is related to[H2O2]/[SC(NH2)2]ratio.No bistability is observed in the system.

Key words: Chemical oscillation, Thiourea, Hydrogen peroxide

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