Heterogeneous Liquid-Phase Oxidation of Alcohols with Solid Oxidizing Reagents of Vanadium(V) Oxide and Chromium(VI) Oxide Supported on Zirconium(IV) Oxide

Article abstract of DOI:10.1246/bcsj.68.997

The oxidizing reagents in a heterogeneous system were obtained by impregnating Zr(OH)4 with NH4VO3 and (NH4)2CrO4 followed by calcination in air at 773 K.These materials (V2O5/ZrO2 and CrO3/ZrO2) converted alcohols into their corresponding aldehydes or ketones at moderate temperatures in a solvent with very high selectivity.Changes in the oxidation states of vanadium and chromium were investigated by a temperature-programmed reduction method (TPR).A linear relation was found between the yield of cyclohexanone formed from cyclohexanol and the amount of reduced vanadium or chromium, determined by TPR.It was confirmed that the active species of V(V) and Cr(VI) were reduced to V(II) and Cr(IV), respectively, in the oxidation process.