Selective catalytic reduction articles and systems

US11344868B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jeff Yang · Glen Rock, US
• Wen-Mei Xue
• Stanley A. Roth · Yardley, US
• Kenneth E. Voss · Iselin, US
• Qi Fu · Shanghai, CN
• Subramanian Prasad · Edison, US
• Barbara Slawski · North Royalton, US
• Jaya L. Mohanan · Edison, US
• Sandip D. Shah · East Brunswick Township, US

Key dates

• Filing date: Aug 4, 2017
• Grant date: May 31, 2022
• Expiry date: Oct 27, 2037

Classification

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

Abstract

Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low N2O formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings disposed thereon, for example, a zoned coating comprising an upstream zone comprising a coating layer comprising a steam-activated iron-containing molecular sieve and a downstream zone comprising a coating layer comprising a high copper-containing molecular sieve.