高等学校化学学报

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (12): 2331.

• 研究论文 • 上一篇    下一篇

1,3-二甲基-5-亚硝基-6-氨基脲嘧啶铂电极电化学加氢机理研究

郑翔龙, 胡熙恩   

  1. 清华大学核能技术研究院, 北京100084
  • 收稿日期:2003-12-30 出版日期:2004-12-24 发布日期:2004-12-24
  • 基金资助:

    清华大学基础研究基金(批准号:2000-985科-04-09)资助

Electrochemical Hydrogenation Mechanism of 6-Amino-5-nitroso- 1,3-dimethyluracil on Pt Electrode

ZHENG Xiang-Long, HU Xi-En   

  1. Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, China
  • Received:2003-12-30 Online:2004-12-24 Published:2004-12-24

PDF (PC)

被引次数

4

摘要： 采用稳态极化法、循环伏安法和恒电位库仑法对1,3-二甲基-5-亚硝基-6-氨基脲嘧啶在铂电极上的电化学加氢机理进行了研究,研究介质为硫酸和硫酸钾水溶液.结果表明,pH=3时,1,3-二甲基-5-亚硝基-6-氨基脲嘧啶在铂电极析氢电位(-600～-800mV,vs.饱和硫酸钾的硫酸亚汞参比电极)前,发生加氢还原反应,氢离子在铂电极表面得到电子生成原子态的氢参与反应.随着pH值降低,加氢反应速度增大,还原电位正移.在铂电极上的电化学加氢过程受扩散控制,增大搅拌速度和提高温度都可提高反应速度.

关键词: 电化学加氢, 循环伏安法, 1, 3-二甲基-5-亚硝基-6-氨基脲嘧啶(ANDMU)

Abstract: The electrochemical hydrogenation mechanism of 6-amino-5-nitroso-1,3-dimethyluracil on Pt electrode was studied by steady state polarization, cyclic voltammetry and constant-potential coulometry. One irreversible peak was found in the range of -600_-800 mV(vs. Hg/Hg2SO4) by cyclic voltammetry in pH=3 aqueous solution. The number of electrons involved in the electrochemical reaction was 4. One electron and one hydrogen ion were involved in the rate-determined step of electron transfer process. The reaction was controlled by diffusion and the reaction rate increased with increasing temperature and stirring speed and with decreasing pH.

Key words: Electrochemical hydrogenation, Cyclic voltammetry, 6-Amino-5-nitroso-1,3-dimethyluracil(ANDMU)

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