Patent ID: 7091377

Claim:
A multimetal oxide material of the stoichiometry I Mo 1 V a M 1 b M 2 c M 3 d O n (I) where M 1 is at least one of the elements selected from the group consisting of Te and Sb; M 2 is at least one of the elements selected from the group consisting of Nb, Ti, W, Ta and Ce; M 3 is at least one of the elements selected from the group consisting of pb, Ni, Co, Bi, Pd, Ag, Pt, Cu, Au, Ga, Zn, Sn, In, Re, Ir, Sm, Sc, Y, Pr, Nd and Tb; a is from 0.01 to 1; b is from >0 to 1, c is from >0 to 1, d is from >0 to 0.5 and n is a number which is determined by the valency and frequency of the elements other than oxygen in (I), whose X-ray diffraction pattern has reflections h, i and k whose peaks are at the diffraction angles (2⊖) 22.2±0.5° (h), 27.3±0.5° (i) and 28.2±0.5° (k), the reflection h being the one with the strongest intensity within the X-ray diffraction pattern and having an FWHH of not more than 0.5°, the intensity P i of the reflection i and the intensity P k of the reflection k fulfilling the relationship 0.65≦R≦0.85, where R is the intensity ratio defined by the formula R=P i /(P i +P k ) and the FWHH of the reflection i and of the reflection k is in each case≦1°, wherein the at least one multimetal oxide material (I) is one whose X-ray diffraction pattern has no reflections with a peak i position 2⊖=50.0±0.3°.