Patent ID: 8822371

Claim:
A process for producing geometric shaped catalyst body K, which comprises, as an active material, a multielement oxide I having stoichiometry (I): [Bi 1 W b O x ] a [Mo 12 Z 1 c Z 2 d Fe e Z 3 f Z 4 g Z 5 h O y ] 1 (I), wherein: Z 1 is nickel, cobalt, or a mixture thereof; Z 2 is an alkali metal, an alkaline earth metal, thallium, or any mixture thereof; Z 3 is zinc, phosphorus, arsenic, boron, antimony, tin, cerium, vanadium, chromium, bismuth, or any mixture thereof; Z 4 is silicon, aluminum, titanium, tungsten, zirconium, or any mixture thereof; Z 5 is copper, silver, gold, yttrium, lanthanum, a lanthanide, or any mixture thereof; a is 0.1 to 3; b is 0.1 to 10; c is 1 to 10; d is 0.01 to 2; e is 0.01 to 5; f is 0 to 5; g is 0 to 10; h is 0 to 1; and x and y are numbers determined by the valency and frequency of the elements in stoichiometry (I) other than oxygen, the process comprising: (I) preforming a finely divided mixed oxide Bi 1 W b O x having a particle diameter d 50 A1 reported in the length unit μm, as starting material A1, with the proviso that 1 μm≦d 50 A1 ≦10 μm; (II) mixing sources of the elements other than oxygen in the component T=[Mo 12 Z 1 c Z 2 d Fe e Z 3 f Z 4 g Z 5 h O y ] 1 of the multielement oxide (I) in an aqueous medium, to obtain an intimate aqueous mixture (M), with the proviso that each of the sources employed, in the course of preparation of the aqueous mixture (M), passes through a degree of division (Q) for which its diameter d 90 Q is ≦5 μm, and the aqueous mixture (M) comprises the elements Mo, Z 1 , Z 2 , Fe, Z 3 , Z 4 , and Z 5 in the stoichiometry (I*) Mo 12 Z 1 c Z 2 d Fe e Z 3 f Z 4 g Z 5 h (I*); (III) drying and adjusting the degree of division d 90 A2 of the aqueous mixture (M), to obtain a finely divided starting material A2 having a particle diameter d 90 A2 reported in the length unit μm, with the proviso that 200 μm≧d 90 A2 ≧20 μm; (IV) mixing starting material (A1) and starting material (A2), or starting material (A1), starting material (A2) and finely divided shaping assistant, to form a finely divided starting material (A3), with the proviso that the starting material (A3) comprises the elements other than oxygen introduced into the starting material (A3) via starting materials (A1) and (A2) in the multielement oxide I in the stoichiometry (I**): [Bi 1 W b ] a [Mo 12 Z 1 c Z 2 d Fe e Z 3 f Z 4 g Z 5 h ] 1 (I**), (V) forming a geometric shaped body (V) with the finely divided starting material (A3); and (V1) thermally treating the shaped body (V) at an elevated temperature, to obtain the geometric shaped catalyst bodies (K), wherein the value F of the product ( d 50 A1 ) 0.7 ·( d 90 A1 ) 1.5 ·( a −1 ) is ≧820.