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Portugaliae Electrochimica Acta

versão impressa ISSN 0872-1904

Port. Electrochim. Acta v.23 n.4 Coimbra  2005

 

Electrochemical Oxidation of Toluene on Glassy Carbon Electrodes in Organic Medium

  

Luis F. D´Elia,* R. Ortíz 

Universidad de los Andes, Facultad de Ciencias, Departamento de Química, Laboratorio de Electroquímica, Mérida 5101, Venezuela

 

 

Abstract

The electro-oxidation of toluene in 0.1 M But4NPF6 + CH3CN solutions on glassy carbon electrodes was studied using electrochemical and spectroelectrochemical techniques. Toluene electro-oxidation yields an electrochemical inactive film on the electrode surface. In situ Fourier Transformed Infrared (FTIR) studies suggest the formation of a polymeric film, as the main product, on the surface. Depending on the experimental time scale toluene transformation is a complex reaction that could involve adsorption processes, pure charge transfer reaction and couple chemical reactions. Additions of small quantities of water to the electrolyte cause a cathodic displacement of the oxidation peak potential; in other words, the electro-oxidation reaction is favoured.

Keywords: electrochemical oxidation, toluene, organic medium, glassy carbon, in situ FTIR.

 

 

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* Corresponding author. E-mail address: delialf@pdvsa.com

Present address: Petróleos de Venezuela (PDVSA)-Intevep; Gerencia General de Refinación e Industrialización; Gerencia Técnica de Refinación;  Apartado 76343; Caracas 1070-A; Venezuela.

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