Patent ID: 6171571
Filing Date: 2001-01-09
Classification: B01J,C01G,C01P,C07C,Y02P

Abstract:
A crystalline metal oxide composition having an empirical formula of:A.sub.n NbM.sub.x M'.sub.y M"".sub.m O.sub.pwhere 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, M' is selected from the group consisting of vanadium, tantalum and mixtures thereof, and M"" is selected from the group consisting of antimony, tellurium and mixtures thereof, ""n"" varies from about 0.1 to about 2, ""x"" varies from about 0.01 to about 4, ""y"" varies from zero to 4, ""m"" varies from zero to about 0.9 and ""p"" has a value such that it balances the valence of the combined elements, A, Nb, M, M', M"", the composition characterized in that it has at least one x-ray diffraction peak at a d spacing of about 3.9.+-.0.15 .ANG. and when M is either Mo or a mixture of W and Mo and M' is V and y>0 then the composition has a surface area of at least 25 m.sup.2 /g.