Cobalt-Vanadyl mixed polyoxometallates as new catalysts for green adipic acid production

Abstract

The combination of Keggin type polyoxometallates (POMs) of formula H1.5-2xCo0.75VOxPMo12O40 noted Co0,75VOx (x = 0–0.75) as clean catalysts and hydrogen peroxide as green oxidant in the absence of solvent seems to be effective for an ecological synthesis of adipic acid (AA) from cyclohexanone (-one) oxidation in homogeneous phase at 90 °C.The catalytic results showed that the AA yield is sensitive to the POMs composition and to the reaction conditions such as solvent nature, substrate amount and catalyst mass. Promising results were obtained in 10 h of reaction under conventional heating in the presence of Co0.75V0.25 with 31% of AA yield.