Method for the reduction of nitrogen oxides from waste gases using a zeolite

US5116586A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Michael Baacke · Hanau, DE
• Reinhold Beand · Hanau, DE
• Bernd Engler · Hanau, DE
• Akos Kiss · Alzenau, DE
• Peter Kleine-Mollhoff · Höchberg, DE
• Peter Kleinschmit · Hanau, DE
• Edgar Koberstein · Alzenau, DE
• Mustafa Siray · Hanau, DE

Key dates

• Filing date: Dec 14, 1989
• Grant date: May 26, 1992
• Expiry date: Dec 14, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2255/50
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A zeolite catalyst and a method for reduction of nitrogen oxides present in waste gas streams is described. The method includes mixing the waste gas containing nitrogen oxides with ammonia. At an elevated temperature, this mixture is passed over a zeolite catalyst. Preferably, the zeolite catalyst is in a monolithic or honeycomb form. The zeolite catalyst includes one or more of the following subgroup metals: copper, iron, molybdeum and cerium. The zeolite catalysts made in accordance with this invention show better conversion of nitrogen oxides and longer life than known catalysts.