中华医学超声杂志

应用化学 ›› 1997, Vol. 0 ›› Issue (1): 45-48.

• 研究论文 • 上一篇    下一篇

电化学方法研究I3-和Ti3+在铂上的异相催化

肖少荣   

  1. 广西师范学院化学系 南宁 530001
  • 收稿日期:1996-03-31 修回日期:1996-06-17 出版日期:1997-02-10 发布日期:1997-02-10

Electrochemical Studies of Heterogeneous Catalysis Between Triiodide and Titanium(Ⅲ)Ions on Platinum

Xiao Shaorong   

  1. Department of Chemistry, Guangxi Teachers College, Nanning 530001
  • Received:1996-03-31 Revised:1996-06-17 Published:1997-02-10 Online:1997-02-10

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摘要： 用电化学方法研究了I3-和Ti3+在还原铂表面上的电极反应,由此计算出I3-与Ti3+在还原铂表面上的混合催化反应速率(νmix).当混合催化电位(Emix)位于极限电流区时,νmix对[Ti3+]为零级反应,对[I3-]为一级反应,且正比于电极旋转速率的平方根,H+浓度影响不大。由动力学方法研究的结果证实了电化学研究结果的正确性,致使可用电化学方法解释溶液中的异相催化问题

关键词: I3-, Ti3+, 铂旋转圆盘电极, 电化学, 动力学

Abstract: The mixed catalytic rate(νmix)of the reaction between I3- and Ti3+ions on reduced Pt surface has been calculated through the electrochemical study on electrode reactions of I3-/I-and Ti3+/Ti4+. When the mixed potential(Emix)lies in the limiting current region, νmix is independent of Ti3+concentration and is first order to. νmix is also proportional to the square root of the rotating speed of electrode. There is only small differences in νmix as the H+ concentration changes. Results obtained by electrochemistry agree with the results measured by kinetic method. The results of this heterogeneous catalysis in solution have been predicted and explained by pure electrochemistry.

Key words: triiodide ion, titanium(Ⅲ)ion, rotation disk(Pt)electrode, electrochemistry, kinetics

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