Cobalt Oxide Nanoparticles Supported on y-Alumina as Catalysts in the Selective Oxidation of Alcohols in Aqueous Phase

摘要

In this work, cobalt oxide nanoparticles supported on y-alumina were prepared and were well characterized by scanning electron micrograph (SEM) and X-ray diffraction patterns. These were employed as catalysts for the oxidation of alcohols to aldehydesor ketones with tert-butylhydroperoxide (TBHP) and hydrogen peroxide (H_2O_2) as the oxidant in the liquid phase. For these cobalt oxide nanoparticles supported on y-alumina, acetonitrile as the solvent was employed. The research results showed that oxidant and the catalyst type influenced the conversion percent of alcohols oxidation. TBHP was found to be better oxidant than H202 since higher conversion percent of alcohols were observed when TBHP was employed. The catalytic activity of 10%Co3O4ano-y-alumina was superior to that of 5% and 15% Co304ano-y-aIumina catalysts. Under the optimum reaction conditions, the catalytic system of 10%Co3O4 nanoparticles supported on y-alumina gave about 82.3% conversion percent of cyclohexanol.