Electrochemical reduction of sodium metavanadate in an equimolar KCl-NaCl melt

被引：11
|
作者：
Gasviani, N. A. [1 ]
Khutsishvili, M. Sh. [1 ]
Abazadze, L. M. [1 ]
机构：
[1] Georgian Acad Sci, Agladze Inst Inorgan Chem & Electrochem, GE-380086 Tbilisi, Georgia
来源：
RUSSIAN JOURNAL OF ELECTROCHEMISTRY | 2006年 / 42卷 / 09期
关键词：
melt electrolysis; sodium metavanadate; kinetic parameters; acid-base titration;
D O I：
10.1134/S1023193506090035
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Electrochemical reduction of sodium metavanadate in an equimolar KCI-NaCl melt and the effect of acid-base properties of environment on this process are studied by a voltammetry method on a stationary platinum electrode. It is established that the limiting current of the NaVO3 electroreduction process has a kinetic nature. The process proceeds via an autoinhibition scheme and its rate is limited by an acid-base reaction conjugated with an irreversible charge transfer reaction. A substantial role of cationic composition of the melt is revealed experimentally. Following acidification of the KCI-NaCl-NaVO3 melt by Mg2+ (from MgCl2), the process passes from an irreversible kinetic regime into a reversible diffusion (quasi-diffusion) process. Values of stability constants for vanadates produced with the aid of acid-base titration of vanadium pentoxide by oxygen ions in experimental conditions are presented. These values are taken into account when calculating kinetic parameters of the NaVO3 electroreduction.
引用
收藏
页码：931 / 937
页数：7
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