Emissions treatment systems with TWC catalysts and SCR-HCT catalysts

US9931596B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Xiaolai Zheng · Princeton Junction, US
• Chunxin Ji · Rochester, US
• Wen-Mei Xue
• Matthew J. Schladt · Princeton Junction, US
• Xiaoming Wang · Sunnyvale, US
• Tian Luo · Piscataway, US
• Michel Deeba · East Brunswick Township, US
• Knut Wassermann · Princeton, US

Key dates

• Filing date: Oct 21, 2015
• Grant date: Apr 3, 2018
• Expiry date: Oct 21, 2035

Classification

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

Abstract

An emissions treatment system for an exhaust stream of an internal combustion engine including hydrocarbons, carbon monoxide, and nitrogen oxides is provided. The disclosed system can include an exhaust conduit in fluid communication with the internal combustion engine via an exhaust manifold; a first three-way conversion catalyst (TWC-1) located downstream of the internal combustion engine in the exhaust conduit; an SCR-HCT catalyst comprising a selective catalytic reduction catalyst and a hydrocarbon trap downstream of the TWC-1 in the exhaust conduit; and a third catalyst downstream of the SCR-HCT combination in the exhaust conduit, the third catalyst comprising a platinum group metal (PGM) e.g., in an amount effective to oxidize hydrocarbons. Methods of making and using such systems and components thereof are also provided.