Process for producing coated catalysts for the synthesis of maleic anhydride by gas-phase oxidation

US6048987A · kind A · utility

Assignee

• Consortium für elektrochemische Industrie GmbH · DE

Inventors

• Dirk Groke · Taufkirchen, DE
• Christoph Ruedinger · Starnberg, DE
• Hans Eberle · Mountain View, US
• Reinhard Jering · Hersbruck, DE
• Richard Bosch · Chesterfield, US

Key dates

• Filing date: Jun 23, 1998
• Grant date: Apr 11, 2000
• Expiry date: Jun 23, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/215
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

There is a process for producing coated catalysts for the gas-phase oxidation of C.sub.4 hydrocarbons to maleic anhydride. A vanadyl phosphate catalyst precursor is prepared having a V/P ratio of from 1:0.5 to 1:2 and a mean vanadium oxidation state of from 3.9 to 4.5. The vanadyl phosphate precursor is then calcined by heating for a several hours at a temperature of from 200.degree. C. to 500.degree. C. before being applied, in an aqueous suspension to the support bodies. Furthermore, there is the use of these coated catalysts in processes for the gas-phase oxidation of saturated or unsaturated C.sub.4 -hydrocarbons to maleic anhydride.