Purification device for gases

US6444178B1 · kind B1 · utility

Assignees

• Daimlerchrysler AG · US
• BASF SE

Inventors

• Martin Hartweg · Erbach, DE
• Rolf-Dirc Roitzheim · Blaustein, DE
• Andrea Seibold · Blaustein, DE
• Leonhard Walz · Rastatt, DE
• Thomas Fetzer · Speyer, DE
• Bernd Morsbach · Ludwigshafen, DE

Key dates

• Filing date: Jan 19, 2000
• Grant date: Sep 3, 2002
• Expiry date: Jan 19, 2020

Classification

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

Abstract

An exhaust gas purification device includes a porous body of catalytic material of the general formula AaBbO4 disposed in an exhaust gas stream of an engine. The porous body of catalytic material has a characteristic response temperature above which it is catalytically active to reduce pollutants in the presence of a reducing agent. The porous body stores at least 20% by volume hydrocarbons at temperatures below the response temperature. A represent at least one element selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Zn, Sn, Ti and A+B is less than 3, A is greater than 0 and B greater than 0.