Patent ID: 6921836

Claim:
A multimetal oxide material of the formula I [A] p [B] q [C] r (I) where A is Mo 12 V a X 1 b X 2 c X 3 d X 4 e X 5 f X 6 g O x , B is X 7 1 Cu h H i O y , C is X 8 l Sb j H k O z , X 1 is W, Nb, Ta, Cr and/or Ce, X 2 is Cu, Ni, Co, Fe, Mn and/or Zn, X 3 is Sb and/or Bi, X 4 is Li, Na, K, Rb, Cs and/or H, X 5 is Mg, Ca, Sr and/or Ba, X 6 is Si, Al, Ti and/or Zr, X 7 is Mo, W, V, Nb and/or Ta, X 8 is Cu, Ni, Zn, Co, Fe, Cd, Mn, Mg, Ca, Sr and/or Ba, a is from 1 to 8, b is from 0.2 to 5, c is from 0 to 23, d is from 0 to 50, e is from 0 to 2, f is from 0 to 5, g is from 0 to 50 h is from 0.3 to 2.5, i is from 0 to 2, j is from 0.05 to 50, k is from 0 to 50, x, y and z are numbers which are determined by the valency and frequency of the elements other than oxygen in (I) and p, q and r are numbers other than zero, with the proviso that the ratio p/(q+r) is from 20:1 to 1:20, and the ratio q/r is from 20:1 to 1:20, which contains the moiety [A] p in the form of three-dimensional regions A having the chemical composition Mo 12 V a X 1 b X 2 c X 3 d X 4 e X 5 f X 6 g O x , (A) the moiety [B] q in the form of three-dimensional regions B having the chemical composition X 7 l Cu h H i O y and (B) the moiety [C] r in the form of three-dimensional regions C having the chemical composition X 8 l Sb j H k O z (C) the regions A, B and C being distributed relative to one another in the same way as in a mixture comprising finely divided A, finely divided B and finely divided C.