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A comparison of the electrooxidation kinetics of p-methoxyphenol and p-nitrophenol on Sb-doped SnO2 surfaces: Concentration and temperature effects

Paper ID Volume ID Publish Year Pages File Format Full-Text
48959 46533 2007 7 PDF Available
Title
A comparison of the electrooxidation kinetics of p-methoxyphenol and p-nitrophenol on Sb-doped SnO2 surfaces: Concentration and temperature effects
Abstract

We discuss the role of the phenol substituent on the kinetics of electrochemical oxidation on metal oxide surfaces. Using UV–vis spectroscopic and high performance liquid chromatographic analyses of solutions during electrolysis on antimony-doped tin oxide (Sb-SnO2) electrodes, we established that the oxidation of p-methoxyphenol (PMP) and p-nitrophenol (PNP) follow different reaction mechanisms. The initial PNP and PMP oxidation rates are well represented as functions of the initial phenol concentrations by the Langmuir–Hinshelwood mechanism. At high concentrations of phenol in solution, the oxidation rates are controlled by surface processes. Under surface saturation conditions the formation of OH surface species required for complete oxidation is hampered, lowering the extent of PNP oxidation. The effect of temperature on the oxidation of PNP and PMP on Sb-SnO2 electrodes was also studied. UV–vis spectroscopy of solutions during electrolysis show that the oxidation rates of both compounds follow Arrhenius behaviour; however, the fraction of the PMP initially present oxidized after the passage of a given electric charge was not affected by temperature, whilst the fraction of PNP oxidized increased with temperature. The dissimilar behaviour is ascribed to differing adsorption of PMP and PNP on the surface of the SnO2 electrode, as established from the correspondence of kinetic data to the Langmuir–Hinshelwood mechanism.

Keywords
Electrocatalysis; Temperature; Metal oxide anode; Oxidation of organics
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A comparison of the electrooxidation kinetics of p-methoxyphenol and p-nitrophenol on Sb-doped SnO2 surfaces: Concentration and temperature effects
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 72, Issues 1–2, 8 March 2007, Pages 98–104
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us