| abstract |
Catalyst material for the oxidation and / or oxidative dehydrogenation of hydrocarbons, in particular for the selective oxidation of propane to acrylic acid, comprising a) molybdenum (Mo), b) vanadium (V), c) niobium (Nb), d) tellurium (Te), e) nickel (Ni), f) Tungsten (W) and g) manganese (Mn), which is free of gold (Au), in which the molar ratio of the elements nickel, tungsten and manganese to molybdenum in each case in the range of 0.0025: 1 to 0.3: 1, with an X-ray diffractogram, the diffraction peaks h, i , k and l whose vertices at the diffraction angles (2θ) are 26.2 ± 0.5 (h), 27.0 ± 0.5 (i), 7.8 ± 0.5 (k) and 28.0 ± 0.5 (l) lie; and wherein the intensities P h, P i, P k, P l of the reflections h, i, k and l of the X-ray diffraction satisfy the following relationships, x R (x = i to 3) than that defined by the relations intensity ratio: R 1 = P h / (P h + P i)> 0.3, preferably> 0.35, and most preferably>0.4; and R 2 = P i / (P i + P l )> 0.5, preferably> 0.6 and more preferably>0.63; and R 3 = P i / (P i + P k ) <0.8, preferably <0.75, more preferably <0.7; and wherein in the X-ray diffraction pattern the diffraction reflection i has the second highest intensity and the diffraction reflection h has the third highest intensity. |