Low temperature syntheses of sodium and copper vanadium oxibronzes

Abstract

Low temperature preparations of vanadium oxibronzes were carried out to obtain finely divided powders in view of catalytic applications. From a commercial precursor V 2O 5, the reduction by LiI in acetonitrile led to δ-LiV 2O 5. The synthesis of α′-NaV 2O 5 was achieved for the first time at 373 K by the ionic exchange Li + Na + in aqueous solution. A new copper bronze, Cu 0.5V 2O 5(H 2O) 0.5, was also prepared according to the same experimental procedure by Li + Cu 2+ or Na + Cu 2+ exchange. These lithium, sodium and copper bronzes exhibit surface areas ranging from 5 to 50 m 2g −1 which make them good candidates for catalytic studies.