Characterization and catalytic activity of novel palladium-incorporated vanadium phosphates

Abstract

Palladium has been introduced into the layered vanadyl hydrogen phosphate hemihydrate VOHPO 4·0.5H 2O in different ways depending upon the medium of preparation. In aqueous medium, the introduction of palladium leads to the formation of a new phase containing mixed valent vanadium whereas in the preparation in organic medium, the palladium appears to substitute into the lattice of the parent compound. The palladium-incorporated compounds have been found to be catalytically active, both for oxidative coupling as well as for hydrogenation reactions, with the activity and selectivity varying quite markedly with the mode of incorporation.