Passive ammonia-selective catalytic reduction for NOx control in internal combustion engines

US8381512B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Norman D. Brinkman · Troy, US
• Paul M. Najt · Bloomfield Hills, US
• Kushal Narayanaswamy · Sterling Heights, US
• David Brown · Brighton, US
• Wei Li · Troy, US
• Kevin L. Perry · Fraser, US
• Gongshin Qi · Troy, US
• Orgun A. Guralp · Ann Arbor, US

Key dates

• Filing date: Apr 27, 2009
• Grant date: Feb 26, 2013
• Expiry date: Jun 2, 2031

Classification

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

Abstract

Engine exhaust gas feedstream NOx emissions aftertreatment includes a catalytic device connected upstream of an ammonia-selective catalytic reduction device including a base metal. Engine operation can be modulated to generate an engine-out exhaust gas feedstream that converts to ammonia on the catalytic device. The ammonia is stored on the ammonia-selective catalytic reduction device, and used to reduce NOx emissions in the exhaust gas feedstream.