SCR catalytic converter having improved NOx conversion

US9694320B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Christoph Reith · Motten, DE
• Michael Seyler · Rodenbach, DE

Key dates

• Filing date: Feb 21, 2014
• Grant date: Jul 4, 2017
• Expiry date: Feb 21, 2034

Classification

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

Abstract

The invention relates to the possibility of improving selective catalytic reduction (SCR), which is the selective reaction of nitrogen oxides with ammonia in the exhaust gas of combustion processes on an exhaust-gas catalytic converter suitable therefor—the SCR catalytic converter. For this purpose, materials used in the catalytic converter for storing ammonia are distributed on the catalyst carrier in such a way that, viewed in the flow direction, a region having low ammonia storage capacity is followed by a region of higher ammonia storage capacity.