Process for the reduction of nitrogen oxides contained in exhaust gases

US5085840A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Held · Emmendingen, DE
• Axel Konig · Wemmel, BE
• Lothar Puppe · Burscheid, DE

Key dates

• Filing date: Jan 28, 1991
• Grant date: Feb 4, 1992
• Expiry date: Jan 28, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the reduction of nitrogen oxides in flue gases and engine exhaust gases is improved by contacting the gases with a zeolite catalyst containing oxides of the transition elements from Periods 4, 5 and 6 of the Periodic Table of Elements or oxides of the rare earths. In particular, faujasite zeolites, mordenites and SiO.sub.2 -rich zeolites are preferred.