Abstract
A series of carbon graphite-supported 12-tungsto-silicic (H4SiW12O40, abbreviated as SiW12) catalysts with various loadings, were prepared and characterized by means of FTIR, XRD, and polarography. These series of catalysts were attached onto glassy carbon (GC) electrodes by using polyvinylidene difluoride (PVDF) as binder. The resulting carbon supported SiW12 modified electrodes were characterized by means of cyclic voltammetry (CV) and tested for the electrooxidation of cyclohexane to cyclohexanone (K) and cyclohexanol (A). It has been found that the cyclohexanone, cyclohexanol and cyclohexyl hydroperoxide (CyOOH) are the major products of the reaction. The results of the CV showed that increasing the SiW12 loading, increased the exchanged electronic charge Qh (mC). Higher loadings promoted cyclohexanone production whereas lower ones favored cyclohexyl hydroperoxide formation.