Patent ID: 6428765
Filing Date: 2002-08-06
Classification: B01J,C01G,C01P

Abstract:
A crystalline metal oxide composition having an empirical formula of:AnTaMxMâ€²yMâ€³mOp where A is a cation selected from the group consisting of an alkali metal ion, ammonium ion or mixtures thereof, M is molybdenum, tungsten and mixtures thereof, Mâ€² is selected from the group consisting of vanadium, antimony, tellurium, niobium and mixtures thereof, and Mâ€³ is selected from the group consisting of titanium, tin, indium, gallium, aluminum, bismuth and mixtures thereof, â€œnâ€  varies from about 0.1 to about 2, â€œxâ€  varies from about 0.01 to about 8, â€œyâ€  varies from zero to about 4, â€œmâ€  varies from zero to about 0.9 and â€œpâ€  has a value such that it balances the valence of the combined elements, A, Ta, M, Mâ€², Mâ€³, the composition characterized in that it has at least one x-ray diffraction peak at a d spacing of about 3.9Â±0.15 Ã¥.