Characterization and catalytic activity of novel compounds containing metal ions incorporated into a layered vanadyl phosphate

Abstract

The addition of metal ions such as Zn2+, Ni2+ and Pd2+ during the preparation of the layered vanadyl hydrogen phosphate VOHPO4·0.5H2O in aqueous medium, leads to the formation of a new phase containing mixed-valent vanadium. In contrast, when the same metal ions are added during the preparation of the vanadyl hydrogen phosphate in organic medium, the structure of the parent compound is retained and the metal ions appear to be present in the lattice. The metal ions incorporated into the vanadyl hydrogen phosphate prepared in different media have been found to be catalytically active, with the activity depending upon the mode of incorporation of the metal ion.