Four way conversion catalysts for gasoline engine emissions treatment systems

US11181023B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Janosch Cravillon · Hannover, DE
• Stephan Siemund · Pattensen, DE
• Attilio Siani · Shanghai, CN
• Thomas Schmitz · Wesseling, DE
• Oliver Seel · Nienburg/Weser, DE
• Knut Wassermann · Princeton, US

Key dates

• Filing date: Jul 25, 2017
• Grant date: Nov 23, 2021
• Expiry date: Dec 25, 2037

Classification

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

Abstract

Catalyzed particulate filters comprise three-way conversion (TWC) catalytic material that permeates walls of a particulate filter such that the catalyzed particulate filter has a coated porosity that is less than an uncoated porosity of the particulate filter. The coated porosity is linearly proportional to a washcoat loading of the TWC catalytic material. A coated backpressure is non-detrimental to performance of the engine. Such catalyzed particulate filters may be used in an emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust stream comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates.