Catalyst for removal of nitrogen oxides from exhaust gases

US4672052A · kind A · utility

Assignees

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

Inventors

• Dietrich Wagener · Essen, DE
• Karl H. Laue
• Egmar Wunderlich · Pulheim, DE
• Theo Sander · Essen, DE
• Claus Flockenhaus · Essen, DE
• Erich Hackler · Essen, DE
• Blagoje Levkov · Wiesbaden, DE
• Daniel Grimm · Schlangenbad, DE
• Hartmut Kainer · Wiesbaden, DE
• Hermann Stein · Taunusstein, DE

Key dates

• Filing date: Aug 22, 1985
• Grant date: Jun 9, 1987
• Expiry date: Aug 22, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2330/06
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A catalyst for use in a process for the removal of nitrogen oxides from exhaust gases contaminated with dust in which the process uses ammonia. The catalyst is made of a material which is easily disposable. Furthermore, the catalyst should be completely used up in the catalysis. The catalyst comprises individual ceramic bricks with a porous surface, and passages therethrough for the flow of the exhaust gases. The bricks exhibit a resistance to abrasion which is designed so that the dust of the exhaust gas which flows through the passages erodes the catalyst surface, thereby reactivating the catalyst. The exhaust gas carries the dust and the eroded material along with it.