| abstract |
A shell catalyst consisting of a hollow cylindrical carrier body of a length of 2 to 10 mm, an outer diameter of 4 to 10 mm and a wall thickness of 1 to 4 mm and an applied to the outer surface of the carrier body shell of catalytically active oxide composition of the general formula I, Mo 12 V 2 to 4 W 0 to 3 Cu 0.8 to 1.5 X 1 0 to 4 X 2 0 to 40 O n (I), in which the variables have the following meaning: X 1 = one or more elements of the alkali and alkaline earth metals; X 2 = one or more elements from the group Si, Al, Ti and Zr; and n = the stoichiometric coefficient of the element oxygen, which is determined by the stoichiometric coefficients of the non-oxygen elements and their charge number in I. |