Catalyst for the oxidation of acrolein and methacrolein to acrylic acid and methacrylic acid, respectively

US4259211A · kind A · utility

Assignee

• BASF SE

Inventors

• Richard Krabetz · Tauberbischofsheim, DE
• Walter Herrmann · Sellersville, US
• Norbert Scholz · Recklinghausen, DE
• Heinz Engelbach
• Gerd-Juergen Engert · Bischofswerda, DE
• Carl-Heinz Willersinn · Ludwigshafen, DE
• Gerd Duembgen · Schifferstadt, DE
• Fritz Thiessen · Ludwigshafen, DE

Key dates

• Filing date: Nov 24, 1978
• Grant date: Mar 31, 1981
• Expiry date: Nov 24, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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 ha…