Ferrous zeolite, method for producing ferrous zeolites, and method for catalytically reducing nitrous oxides

US9517461B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Dirk Grossschmidt · Mannheim, DE
• Bilge Yilmaz · Mannheim, DE
• Dirk Klingler · Mannheim, DE
• Bernd Zoels · Obrigheim, DE

Key dates

• Filing date: Dec 13, 2010
• Grant date: Dec 13, 2016
• Expiry date: Oct 10, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02C20/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Described is an iron-containing zeolite wherein the number of iron sites, based on the zeolite, is greater than the number of cationic positions in the zeolite. Also described is an iron-containing zeolite preparable by gas phase reaction with iron pentacarbonyl, said zeolite having a greater specific surface area than iron-containing zeolites prepared analogously by ion exchange and/or being more hydrothermally stable than iron-containing zeolites prepared analogously by ion exchange, or wherein the number of iron clusters larger than 10 nm is less than 15% by weight, based on the total amount of iron. Further described is a process for preparing an iron-containing zeolitic material, which comprises doping with iron by means of a gas phase reaction using iron pentacarbonyl. Further described is a process for catalytic reduction of nitrogen oxides using catalysts comprising said iron-containing zeolitic materials.