Method for the reactivation of a catalyst used for removal of nitrogen oxides

US4656148A · kind A · utility

Assignee

• Didier-Werke AG · DE

Inventors

• Hans-Eugen Buhler · Königstein, DE
• Hermann Stein · Taunusstein, DE
• Blagoje Levkov · Wiesbaden, DE
• Hartmut Kainer · Wiesbaden, DE
• Horst Kalfa · Idstein, DE
• Daniel Grimm · Schlangenbad, DE

Key dates

• Filing date: Aug 22, 1985
• Grant date: Apr 7, 1987
• Expiry date: Aug 22, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S502/515
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a process for the reactivation of a catalyst, which is used for the removal of NO.sub.x, oxides of nitrogen, from exhaust gases, the catalyst should be capable of easy reactivation. For this purpose, when the catalyst starts to lose its activity, it is exposed in a reducing atmosphere to a carbon monoxide current. In an apparatus for the execution of the process, the catalyst is placed in two separate chambers. The carbon monoxide stream is directed alternately to both chambers.