Process for the manufacture of a catalyst for the reduction of nitrogen oxides in exhaust gases

US4751212A · kind A · utility

Assignees

• Didier Engineering GmbH · DE
• Didier-Werke AG · DE

Inventors

• Claus Flockenhaus · Essen, DE
• Erich Hackler · Essen, DE
• Karl H. Laue
• Klaus Merkel · Essen, DE
• Arnold Max · Bottrop, DE
• Werner Stender · Raesfeld, DE
• Johann Jansen · Duisburg, DE
• Hartmut Kainer · Wiesbaden, DE
• Daniel Grimm · Schlangenbad, DE
• Blagoje Levkov · Wiesbaden, DE

Key dates

• Filing date: Dec 5, 1986
• Grant date: Jun 14, 1988
• Expiry date: Dec 5, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/8628
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the manufacture of a catalyst for the reduction of nitrogen oxides in exhaust gases. The catalyst contains a metal oxide. The catalyst is preferably used for catalytic reduction with ammonia. The process comprises screening a natural goethite iron ore to the required grain size and then treating the ore with sulfuric acid. Subsequently, the goethite iron ore is heated to a temperature which approximately equals the temperature at which it will be used in the catalytic reaction.