Patent ID: 7462727

Claim:
A multimetal oxide of the formula I, Ag a-c Q b M c V 2 O d *e H 2 O I where a is from 0.3 to 1.9, Q is an element selected from among P, As, Sb and/or Bi, b is from 0 to 0.3, M is a metal selected from among Nb, Ce, W, Mn, Ta, Pd, Pt, Ru and Rh, c is from 0.001 to 0.2, with the proviso that (a-c)≧0.1, d is a number which is determined by the valence and abundance of the elements other than oxygen in the formula I and e is from 0 to 20, which has a crystal structure whose X-ray powder diffraction pattern displays reflections at lattice plane spacings d of 15.23±0.6, 12.16±0.4, 10.68±0.3, 3.41±0.04, 3.09±0.04, 3.02±0.04, 2.36±0.04 and 1.80±0.04 Å.