Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-11-24
1981-03-31
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252455R, 252456, 252462, 252464, 252467, 252469, 252470, 562534, 562535, B01J 2322, B01J 2328, B01J 2330, B01J 2372
Patent
active
042592119
ABSTRACT:
Catalysts which consist of a molded carrier, the surface of which is coated with an active catalyst composition of the general formula Mo.sub.12 A.sub.a B.sub.b C.sub.c D.sub.d O.sub.x, where A is V and/or W, B is Cu and/or Fe and/or Mn and/or Ni and/or Cr, C is Nb and/or Ta and/or Bi and/or Sb and/or Sn and/or Th and/or Ce and/or U, D is Li and/or Na and/or K and/or Rb and/or Cs and/or Tl and a is from 0.1 to 18, b is from 0 to 8, c is from 0 to 10, d is from 0 to 2 and x is from 36 to 135, which are particularly active and selective for the oxidation of acrolein and methacrolein with oxygen-containing gases to give acrylic acid and methacrylic acid, respectively, are obtained by first manufacturing the catalyst composition, before applying it to the carrier, from thermally easily decomposed salts of the components by mixing aqueous solutions, slurries or moist solid masses of the salts of the components, drying the mixture and calcining the dried composition at from 140.degree. to 600.degree. C., then milling it to a particle size of less than 150 .mu.m and thereafter applying it, as a mixture with water, as a layer from 10 to 1,500 .mu.m thick, to the premolded carrier, which has a rough surface.
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Duembgen Gerd
Engelbach Heinz
Engert Gerd-Juergen
Herrmann Walter
Krabetz Richard
BASF - Aktiengesellschaft
Shine W. J.
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