Patent ID: 8318631

Claim:
A process for preparing a coated catalyst for counteracting deactivation of the catalyst, wherein the coated catalyst comprises a support body and a catalytically active composition, the process comprising: preparing a finely divided mixture of (i) at least one finely divided multielement oxide comprising elements Mo and V in a molar ration of Mo to V from 15:1 to 1:1, or comprising the elements Mo and V and in addition at least one of the two elements Te and Sb, and at least one element selected from the group consisting of Nb, Pb, Ta, W, Ti, Al, Zr, Cr, Mn, Ga, Fe, Ru, Co, Rh, Ni, Pd, Pt, La, Bi, B, Ce, Sn, Zn, Si, Na, Li, K, Mg, Ag, Au and In, and (ii) at least one finely divided substance S selected from the group consisting of oxides of molybdenum and compounds of molybdenum selected from the group consisting of ammonium molybdate, ammonium polymolybdate, ammonium heptamolybdate tetrahydrate, molybdenum oxide hydrate, and molybdenum hydroxides from which an oxide of molybdenum is formed under an elevated temperature and molecular oxygen, wherein the oxide of molybdenum is a substance having a content of Mo and oxygen of at least 98 wt. %, and applying the finely divided mixture as the catalytically active composition on the support body with the aid of a binder.