Exhaust gas treatment system with upstream SCR catalyst

US11268420B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Kenneth E. Voss · Iselin, US
• Kevin A. Hallstrom · Iselin, US
• Sandip D. Shah · East Brunswick Township, US
• David M. Youngren · West Milford, US
• Andrew Thoms · Iselin, US
• M. Shahjahan Kazi · Kendall Park, US
• Robert Dorner · Hannover, DE

Key dates

• Filing date: Feb 18, 2019
• Grant date: Mar 8, 2022
• Expiry date: Mar 6, 2039

Classification

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

Abstract

A system for treatment of an exhaust gas stream from an engine is provided, containing an upstream selective catalytic reduction (SCR) catalyst, which receives the exhaust gas stream without any intervening catalyst, a diesel oxidation catalyst (DOC) positioned downstream thereof; a catalyzed soot filter (CSF) downstream of the diesel oxidation catalyst; a second SCR catalyst positioned downstream of the catalyzed soot filter; and an ammonia oxidation (AMOx) catalyst. The application also describes use of such systems to reduce nitrogen oxides (NOx) and hydrocarbons (HC) in an exhaust gas stream.