Method for producing a catalytically active multi-element oxide containing the elements Mo, W, V and Cu

A process for producing a catalytically active multielement oxide comprising the elements Mo, W, V, Cu and optionally Sb, wherein the ratio of the elements conforms to the general formula (I)

• Mo12WaVbCucSbd (I)
• where
• a=0.4 to 5.0,
• b=1.0to 6.0,
• c=0.2 to 1.8 and
• d=0.0 to 2.0,
• and the molar proportion of the element Mo in the total amount of all non-oxygen elements is from 5 to 95 mol %, which comprises
• a) using at least one source of the elemental constituents W of the multielement oxide to produce an aqueous solution or aqueous suspension,
• b) admixing the aqueous solution or aqueous suspension obtained in a) with sources of the elemental constituents Mo, V and optionally Sb of the multielement oxide,
• c) admixing the aqueous solution or aqueous suspension obtained in b) with sources of the elemental constituents Cu and optionally Sb of the multielement oxide,
• d) drying the aqueous solution or aqueous suspension obtained in c) and optionally comminuting to produce a powder P,
• e) optionally using the powder P obtained in d), optionally with addition of one or more shaping auxiliaries and after homogeneous mixing, to obtain geometric shaped precursor bodies from the resulting mixture, and
• f) subjecting the powder P obtained in d) or the geometric shaped precursor bodies obtained in e) to thermal treatment to form the catalytically active multielement oxide,
• wherein the aqueous solution or aqueous suspension used in d) comprises from 1.6% to 5.0% by weight of W and from 7.2% to 26.0% by weight of Mo, based in each case on the total amount of aqueous solution or aqueous suspension.