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 ,p H=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 ( -60 0～ -80 0 m V,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 p H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 。
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/Hg 2SO 4) 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第12期2331-2334,共4页
Chemical Journal of Chinese Universities
基金
清华大学基础研究基金 (批准号 :2 0 0 0 -985科 -0 4-0 9)资助
