Ce3+/Ce4+电对在混酸(硫酸和甲磺酸)中的电化学行为

doi:10.13208/j.electrochem.160827

电化学（中英文） ›› 2017, Vol. 23 ›› Issue (6): 718-723. doi: 10.13208/j.electrochem.160827

Ce³⁺/Ce⁴⁺电对在混酸(硫酸和甲磺酸)中的电化学行为

李照华*，徐蛟龙, 吴婷

灵宝金源朝辉铜业有限公司技术研发部，河南灵宝 472500

收稿日期:2016-08-27 修回日期:2017-01-05 出版日期:2017-12-28 发布日期:2017-01-10
通讯作者: 李照华 E-mail:lzh0814@163.com
基金资助:
三门峡市科技攻关计划项目（No. 2016010108）资助

Electrochemical Behaviors of Ce³⁺/Ce⁴⁺ Couple in a Mixed-Acid Medium of CH₃SO₃H and H₂SO₄

LI Zhao-hua*, XU Jiao-long，WU Ting

Research and Development Department, Lingbao JinYuan ZhaoHui Copper Co., Ltd, Lingbao 472500, Henan, China

Received:2016-08-27 Revised:2017-01-05 Published:2017-12-28 Online:2017-01-10
Contact: LI Zhao-hua E-mail:lzh0814@163.com

摘要/Abstract

摘要：

采用循环伏安、线性扫描、交流阻抗等技术研究了Ce³⁺/Ce⁴⁺电对在混酸(硫酸与甲磺酸)中的电化学行为，并对该体系在间接有机电合成中的应用进行了探索.结果表明：当硫酸和甲磺酸(MSA)浓度分别为0.8和1.0 mol·L^-1时，Ce³⁺/Ce⁴⁺电对具有最佳的电化学活性；在上述配比的混酸介质中，铈盐的溶解度得到了大幅提高，同时电解氧化铈(III)离子的电流效率较高（92.1%），与纯硫酸体系中的电流效率接近（92.8%），明显高于纯甲磺酸体系（78.5%）；该混酸介质中Ce⁴⁺在氧化茴香醚生成茴香醛这一过程中也表现出很好的氧化能力.

关键词: 混酸, 电流效率, 溶解度, 电流效率

Abstract:

In order to determine the optimum molar ratio between methanesulfonic acid (MSA) and sulfuric acid, linear sweep voltammetry (LSV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical behaviors of cerium (III)/cerium (IV) (Ce³⁺/Ce⁴⁺couple on a Pt electrode in a mixed acid solution. Various concentrations of sulfuric acid were considered in the experiments, while the concentration of MSA was fixed at 1.0 mol·L^-1. It was found that the optimum concentration of sulfuric acid was 0.8 mol·L^-1 since the current response was the highest in the control groups and Ce³⁺was easier to be oxidized to Ce⁴⁺. In the mixed acid solution, the solubility of cerium (III) increased to 0.95 mol·L^-1 from 0.25 mol·L^-1 in 1.3 mol·L^-1 sulfuric acid solution. Electrolytic experiment and liquid-phase oxidation had been taken to explore the application of the mixed acid medium. The results revealed that Ce³⁺ exhibited the excellent electrochemical activity and Ce⁴⁺demonstrated a stronger oxidation capacity in the mixed acid solution.

Key words: mixed acid, current efficiency, solubility, current efficiency

中图分类号:

O646.1

李照华，徐蛟龙, 吴婷. Ce³⁺/Ce⁴⁺电对在混酸(硫酸和甲磺酸)中的电化学行为[J]. 电化学（中英文）, 2017, 23(6): 718-723.

LI Zhao-hua, XU Jiao-long，WU Ting. Electrochemical Behaviors of Ce³⁺/Ce⁴⁺ Couple in a Mixed-Acid Medium of CH₃SO₃H and H₂SO₄[J]. Journal of Electrochemistry, 2017, 23(6): 718-723.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.160827

https://electrochem.xmu.edu.cn/CN/Y2017/V23/I6/718

参考文献

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Ce³⁺/Ce⁴⁺电对在混酸(硫酸和甲磺酸)中的电化学行为

Electrochemical Behaviors of Ce³⁺/Ce⁴⁺ Couple in a Mixed-Acid Medium of CH₃SO₃H and H₂SO₄

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