Storage catalyst

US6395244B1 · kind B1 · utility

Assignees

• Daimlerchrysler AG · US
• BASF SE

Inventors

• Martin Hartweg · Erbach, DE
• Thomas Fetzer · Speyer, DE
• Bernd Morsbach · Ludwigshafen, DE
• Otto Kumberger · Mannheim, DE

Key dates

• Filing date: Feb 24, 2000
• Grant date: May 28, 2002
• Expiry date: Feb 24, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S502/524
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A storage catalyst includes (1) a component that has a catalytic reducing action for nitrogen oxides at least in the presence of hydrocarbons, and (2) a component that stores NOx at least at temperatures of below 100° C. The catalytically active component is of the general chemical formula AaBbO4, where A is one or more divalent metals and B is one or more trivalent metals, and where a+b≦3 and a, b>0. The reaction enthalpy or the chemical activity between the catalytically active component and the NOx-storing component is low at least up to temperatures of 600° C.