Performance of sol-gel Titanium Mixed Metal Oxide electrodes for electro-catalytic oxidation of phenol

被引：53

作者：

Makgae, M. E. ^{[1
]}

Klink, M. J. ^{[1
]}

Crouch, A. M. ^{[1
]}

机构：

[1] Univ Stellenbosch, Dept Chem, ZA-7602 Matieland, South Africa

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2008年 / 84卷 / 3-4期

基金：

新加坡国家研究基金会;

关键词：

Electro-catalysis; Mixed metal oxide electrodes; Phenol oxidation;

D O I：

10.1016/j.apcatb.2008.05.021

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mixed metal oxides SnO2-RuO2-IrO2, Ta2O5-IrO2 and RhO2-IrO2 were immobilised on a Ti substrate using sol-gel techniques. The Ti mixed metal oxides were characterized in terms of morphology using scanning electron microscopy. Cyclic voltammetric responses of phenol at Ti/SnO2-RuO2-IrO2, Ti/Ta2O5-IrO2 and Ti/RhO2-IrO2 electrodes were evaluated and showed significantly low potentials for Ti/Ta2O5-IrO2 (+100 mV), Ti/SnO2-RuO2-IrO2 (+200 mV) and Ti/RhO2-IrO2 (-100 mV). The degradation of phenol in aqueous solution and its intermediates were investigated by bulk electrolysis and quantitatively assessed by HPLC analysis to elucidate the decomposition pathways and to develop a kinetic model for the electro-catalytic oxidation of phenol over Ti mixed metal oxides. Ring compounds, benzoquinone/hydroquinone, catechol, and short chain organics, carboxylic acids, have been identified as intermediate products for the electro-catalytic oxidation of phenol. Fundamental kinetic data were obtained for the conversion of phenol at these electrodes and was found to proceed in accordance with the pseudo-first-order kinetics with respect to the phenol concentration. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：659 / 666

页数：8

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