Patent ID: 7122707

Claim:
A process for the preparation of a catalyst, which consists of a support having annular geometry and a catalytically active oxide material having formula I applied to the surface of the support Mo 12 Bi a X 1 b Fe c X 2 d X 3 e O y (I), wherein X 1 is Co and/or Ni, X 2 is Si and/or Al, X 3 is Li, Na, K, Cs and/or Rb 0.2≦a≦1, 2≦b≦10, 0.5≦c≦10, 0≦d≦10, 0≦e≦0.5 and y is a number which is determined assuming charge neutrality as a result of the valency and frequency of the elements other than oxygen in formula I, wherein the process comprises: (a) preparing a thorough dry blend from starting compounds of the elemental constituents of the catalytically active oxide material, (b) thermally treating the thorough dry blend at a temperature ranging from 150 to 350° C. to give a finely divided precursor material, (c) moistening the support having annular geometry with water, (d) adhering a layer of the finely divided precursor material to the surface of the moistened support by bringing the latter into contact with the finely divided precursor material, thereby having obtained a coated catalyst, (e) drying the coated support, and (f) finally calcining the dried support coated with precursor material at a temperature ranging from 400 to 600° C.