Patent ID: 6797839
Filing Date: 2004-09-28
Classification: B01J,C01G,C01P,C07C

Abstract:
A multimetal oxide material of the formula I(A)p(B)qâ€ƒâ€ƒ(I), whereA is Mo12VaX1bX2cX3dX4eX5fX6gOx, B is X71SbhHiOy, X1 is W, Nb, Ta, Cr and/or Ce, X2 is Cu, Ni, Co, Fe, Mn and/or Zn, X3 is Sb and/or Bi, X4 is Li, Na, K, Rb, Cs and/or H, X5 is Mg, Ca, Sr and/or Ba, X6 is Si, Al, Ti and/or Zr, X7 is Ni and, optionally, one or more elements selected from the group consisting of Cu, Zn, Co, Fe, Cd, Mn, Mg, Ca, Sr and Ba, a is 1 to 8, b is 0.2 to 5, c is 0 to 23, d is 0 to 50, e is 0 to 2, f is 0 to 5, g is 0 to 50, h is 0.1 to 50, i is 0 to 50, x and y are each numbers which are determined by the valency and frequency of the elements in (I) other than oxygen and p and q are each numbers which differ from zero and whose ratio p/q is from 20:1 to 1:80, which contains the moiety (A)p in the form of three-dimensional regions A having the chemical compositionA: Mo12VaX1bX2cX3dX4eX5fX6gOx and the moiety (B)q in the form of three-dimensional regions B having the chemical compositionB: X71SbhHiOy, the regions A and B are distributed relative to one another as in a mixture of finely divided A and finely divided B, with the proviso that, for the preparation of the multimetal oxide materials (I), at least one separately preformed oxometallate B, X71SbhHiOy, is present, which is obtained by preparing a dry blend from sources of the elemental constituents of the oxometallate B which contain at least a part of the antimony in oxidation state +5, and calcining said dry blend at a temperature of from 200 to below 600Â° C.