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

页码：931 / 937

页数：7

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