Processes for reducing nitrogen oxides using copper CHA zeolite catalysts

US8404203B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ivor Bull · Ludwigshafen, DE
• Wen-Mei Xue
• Patrick Burk · Freehold, US
• R. Samuel Boorse · Skillman, US
• William M. Jaglowski · West Orange, US
• Gerald Stephen Koermer · Berkeley Heights, US
• Ahmad Moini · Princeton, US
• Joseph A. Patchett · Berkeley Heights, US
• Joseph C. Dettling · Howell, US
• Matthew Tyler Caudle · Hillsborough Township, US

Key dates

• Filing date: Jun 8, 2009
• Grant date: Mar 26, 2013
• Expiry date: Jun 8, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24149
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to aluminum ratio from about 0.25:1 to about 1:1.