Process for the removal of harmful substances from exhaust gases of combustion engines and catalyst for carrying out said process

US8087235B2 · kind B2 · utility

Assignee

• HTE GMBH THE HIGH THROUGHPUT EXPERIMENTATION COMPANY · DE

Inventors

• Wolfgang Strehlau · Großkrotzenburg, DE
• Olga Gerlach · Ludwigshafen, DE
• Jürgen Maier · Weitersweiler, DE

Key dates

• Filing date: Apr 14, 2005
• Grant date: Jan 3, 2012
• Expiry date: Dec 24, 2027

Classification

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

Abstract

The present invention relates to an integrated system for the treatment of exhaust gases, which preferably consists of at least one NOx-storing component, at least one in situ ammonia-generating component, at least one ammonia-storing component and at least one ammonia (NH3)-SCR-component, as well as to a process for the treatment of exhaust gas comprising at least the steps (i) storing of NOx under lean exhaust gas conditions in at least one NOx-storing component; (ii) in situ conversion of the stored NOx to ammonia (NH3) under rich exhaust gas conditions; (iii) storing of the ammonia (NH3) in at least one NH3-storing component under rich exhaust gas conditions as well as the (iv) reaction of NH3 with NOx under lean exhaust gas conditions. Thereby, the partial steps “storing of NOx” and “conversion of NH3 with NOx” are carried out at least partially and/or temporarily simultaneously and/or parallelly. Furthermore, preferred catalysts are disclosed for carrying out the process.