The electrochemical reduction of nitrate in acidic nitrate solutions

被引：45

作者：

Rutten, OWJS ^{[1
]}

Van Sandwijk, A ^{[1
]}

Van Weert, G ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Appl Earth Sci, Dept Raw Mat Technol, NL-2628 RX Delft, Netherlands

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 1999年 / 29卷 / 01期

关键词：

nitrates; electrochemical reduction; nitrous acid;

D O I：

10.1023/A:1003412613806

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cathodic regeneration of nitrous acid by electrochemical reduction of nitrates could yield a catholyte which is useful in the processing of manganiferous ores. The purpose of the present investigations was to study the cathodic reaction in an electrolytic cell with an acidic nitrate electrolyte. Electrochemical reduction of nitrate has been investigated in the ranges 0.45-2.70 M H+, 0.0-0.1 M HNO2, 0.5-2.0 M NO3- and 20-80 degrees C at several cathode materials. Potentiodynamic scanning experiments with a platinized titanium cathode showed limiting current densities of 0-300 A m(-2) at cathode potentials of + 950- + 700 mV vs SHE. At cathode potentials less than + 700 mV vs SHE, cathodic reduction of nitrous acid to nitric oxide took place. A linear relation between the nitrous acid concentration and the limiting current density was found in this experimental range. Nitrous acid can be produced by cathodic reduction of nitric acid in a membrane cell. However, the maximum concentration of nitrous acid that can be produced is limited by two reactions; decay of nitrous acid to nitric acid and nitric oxide and cathodic reduction of nitrous acid to nitric oxide.

引用

页码：87 / 92

页数：6

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