中华医学超声杂志

应用化学 ›› 1987, Vol. 0 ›› Issue (2): 42-45.

• 研究论文 • 上一篇    下一篇

FeCl2-K2MoS4体系电催化还原乙炔为乙烯

许书楷1,2, 张瀛州1,2, 周绍民1,2   

  1. 1. 厦门大学化学系;
    2. 厦门大学物理化学研究所
  • 收稿日期:1986-01-21 修回日期:1986-09-10 出版日期:1987-04-10 发布日期:1987-04-10

ELECTROCATALYTIC REDUCTION OF C2H2 TO C2H2 IN FERROUS-MOLYBDATE SYSTEMS

Xu Shukai1,2, Zhang Yingzhou1,2, Zhou Shaomin1,2   

  1. 1. Department of Chemistry, Xiamen University;
    2. Institute of Physical Chemistry, Xiamen University
  • Received:1986-01-21 Revised:1986-09-10 Published:1987-04-10 Online:1987-04-10

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摘要： 采用控电位电解、循环伏安法和交流阻抗法研究了FeCl2-K2MoS4体系对乙炔在石墨电极上还原为乙烯的电催化活性及反应机理。实验结果表明,当石墨阴极的电位控制在-1.50V(vs.SCE)时,FeCl2+K2MoS4的DMF溶液对C2H2还原为C2H4表现出明显的电催化活性和高的选择性。在-0.5～-1.0V时Mo(Ⅵ)还原为Mo(Ⅴ);在按连串的电子传递机理进行的Mo(Ⅴ)→Mo(Ⅲ)反应的电位区间(-1.0～-1.50V)溶液中所形成的络合品种传递电子的能力更强。Mo(Ⅲ)可能是络合物的电活性成分。

Abstract: The electrochemical reduction of C2H2 to C2H4 in 0.1M NaClO4 DMF solution containing FeCl2 and K2MoS4 has been investigated by using potentiostatic electrolysis, cyclic voltammetry and a.c.impedance methods. The results showed that the ferrous-molybdate systems exhibited an appreciable electrocatalytic activity and high selectivity in reducing C2H2 to C2H4 when the potential of the graphite electrode was at -1.50V (vs.SCE). It was sugges-ted that the reaction Mo(Ⅵ)→Mo(Ⅴ) takes place at -0.5--1.0V and the reaction Mo(Ⅴ) to Mo(Ⅲ) at -1.0--1.5V,which proceeds through a consecutive electron transfer mechanism, forming a complex of Mo(Ⅲ) as electorcatalytically active species, faciliating the electron transfer of the reaction.

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