Method for minimizing ammonia slip from SCR catalysts

US8820050B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Alexey A. Dubkov · Aachen, DE
• Mario Balenovic · Waalre, NL
• Jan Harmsen · Simpelveld, NL
• Robert Ukropec · Aachen, DE
• Brendan Patrick Carberry · Aachen, DE

Key dates

• Filing date: Jun 14, 2012
• Grant date: Sep 2, 2014
• Expiry date: Dec 8, 2032

Classification

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

Abstract

Embodiments for reducing ammonia slip are provided. In one example, a method for reduction of ammonia emissions from an engine exhaust gas aftertreatment device with an SCR catalyst comprises determining a concentration of NOx and/or ammonia in the exhaust gas aftertreatment device, comparing a determined value of NOx and/or ammonia concentration with a nominal value for NOx and ammonia, respectively, and if an actual or shortly forecasted ammonia concentration is above the respective nominal value, triggering engine conditions with higher exhaust NOx concentration. In this way, ammonia slip may be reduced without degrading fuel economy.