Collect. Czech. Chem. Commun. 2009, 74, 611-625
Published online 2009-04-03 12:48:11

Electrochemical processes of adsorbed chlorobenzene and fluorobenzene on a platinum polycrystalline electrode

Natálie Musilová-Kebrlováa, Pavel Janderkab and Libuše Trnkovác,*

a Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., 162 06 Prague 6, Czech Republic
b Pragolab Ltd., Jamborova 25, 615 00 Brno, Czech Republic
c Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic


The electrode processes of chlorobenzene (CB) and fluorobenzene (FB) on polycrystalline platinum (Pt-pc) electrode in sulfuric acid were studied by differential electrochemical mass spectrometry (DEMS). Contrary to the oxidation of adsorbed benzene on Pt surface, the oxidation of adsorbed CB and FB in the oxygen adsorption region does not provide solely CO2 as the final product. At negative polarization potentials CB and FB were desorbed under dehalogenation. While in the case of FB only benzene was detected, CB gave intermediates besides benzene. The final product of stepwise hydrogenation of these species was cyclohexane.

Keywords: Electrochemical degradation; Hydrogenation; Dehalogenation; Fluorobenzene; Chlorobenzene; Differential electrochemical mass spectrometry (DEMS); Cyclic voltammetry (CV).

References: 21 live references.