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Citation: ZHAO Jian-Hong, YANG Xu-Zhao, XU Hai-Sheng, WANG Liu-Cheng, SONG Cheng-Ying, WANG Fu-An. The Effect of Surface Composition and State of Cu-Ni Alloy on Electrochemical Reduction of Nitrobenzene to p-Aminophenol[J]. Chinese Journal of Applied Chemistry, ;2006, 23(1): 48-53. shu

The Effect of Surface Composition and State of Cu-Ni Alloy on Electrochemical Reduction of Nitrobenzene to p-Aminophenol

1.
a Institute of Chemical Engineering, Zhengzhou University, Zhengzhou 450002;
2.
b School of Material and Chemical Engineering, Zhengzhou Institute of Light Industry, Zhengzho

Corresponding author: ZHAO Jian-Hong,
Received Date: 12 April 2005
Available Online: 10 August 2005
Fund Project: 河南省重点科技攻关资助项目(03223023800) (03223023800)

In the investigations of electrochemical reduction of nitrobenzene to p-Aminophenol at the Monel alloy electrode, it was found that the yield gradually decreased with the increase of the service time of the Monel alloy electrode.At the initial stage of reaction, the yield of p-Aminophenol at the Monel electrode was 75.2%, which was close to that at the Cu-Hg electrode.Within 500 h service time, the yield could be maintained above 70%.However, the yield decreased greatly to 63.1% after 800 h service, which was close to that at the Cu electrode.In order to figure out the reasons of the decrease, the Monel alloy electrodes before and after service were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and the electrochemical method.The results from the XRD indicate that the surface unit cell composition of the Monel alloy electrode had significant variations after 800 h service, compared with that of the electrode before service.The results from the SEM and EDS show that the changes of the surface composition and state of the Monel alloy electrode were caused by the surface element enrichment of Cu, they were the main reasons for the deterioration of electrocatalytic properties of the electrode in the electrochemical reduction of nitrobenzene.The results from steady-state polarization confirm the conclusion further.
- Monel alloy electrode,
- surface state,
- nitrobenzene,
- p-Aminophenol(PAP),
- electroreduction
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