Electrochemical Oxidation of Phenol on Metal-Impregnated Zeolite Electrodes

Nanodispersed metallic clusters of platinum, silver and cobalt were incorporated into NaX zeolite cavities by impregnation with acetone solution of corresponding acetylacetonates and solvent evaporation followed by acetylacetonate thermal decomposition. The mixture of modified zeolites and 10 wt % o...

Full description

Saved in:
Bibliographic Details
Published in:Chemical engineering & technology 2009-05, Vol.32 (5), p.738-744
Main Authors: Mojović, Z., Milutinović-Nikolić, A., Mentus, S., Jovanović, D.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Cyclic voltammetry
Electrochemical oxidation
Exact sciences and technology
Phenol
Reactors
Zeolite-modified electrodes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nanodispersed metallic clusters of platinum, silver and cobalt were incorporated into NaX zeolite cavities by impregnation with acetone solution of corresponding acetylacetonates and solvent evaporation followed by acetylacetonate thermal decomposition. The mixture of modified zeolites and 10 wt % of carbon black, in the form of a thin layer, was pasted onto a glassy carbon surface by Nafion. With such electrode materials, the phenol oxidation in neutral, alkaline and acid solution was studied by cyclovoltammetry. Deactivation of all electrodes in both neutral and alkaline medium was observed, indicating that polymerization reaction might be the main reaction pathway of phenol at higher pH values. Formation of quinine‐type structures was obtained during electro‐oxidation at lower pH values, being more significant in acidic solutions. Electrochemical oxidation of phenol on metal‐impregnated zeolites was studied in buffered, acidic and alkaline solution. Phenol oxidizes in all investigated solutions whereas the zeolite‐modified electrodes exhibit lower potential for metal‐oxide formation. The highest current was obtained for phenol oxidation in acidic electrolyte.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.200800546