Influence of precursor compounds on the structural and catalytic properties of cobalt-based catalysts

Abstract

The effects of different cobalt precursor compounds on the structural and catalytic properties of cobalt metal and Co3O4 catalysts have been investigated. The techniques employed for characterizing the different solids were XRD, ESR and TEM methods, together with their effectiveness as catalysts in the decomposition of H2O2 at 30-50 °C.The results obtained indicate that the investigated catalysts contained clusters or very small particles of cobalt metal or Co3O4 phases. Cobalt metal and Co3O4 catalysts based on cobalt chloride exhibited higher catalytic activities than other catalysts derived from cobalt nitrate and sulphate salts, respectively, due to their decreased particle sizes. The activation energies of the catalytic reaction over the as-prepared catalysts revealed that the different precursor compounds did not modify the energetic nature of the active sites involved in the catalyzed reaction but changed their concentrations.