Gas filter with catalytic coating and a gastight downstream region

US5089237A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Hans-Dieter Schuster · Schorndorf, DE
• Friedhelm Nunnemann · Winnenden, DE
• Hans-Joachim Langer · Waiblingen, DE
• Erwin Strohmer · Winnenden, DE
• Gerd Tiefenbacher · Esslingen am Neckar, DE

Key dates

• Filing date: Jun 29, 1990
• Grant date: Feb 18, 1992
• Expiry date: Jun 29, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/165
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A soot burn-off filter including a monolithic filter block made of porous ceramic with a multiplicity of channels which extend in the direction of flow of the exhaust gases of a combustion engine. The channels are sealed alternately at the ends by plugs and are separated from one another by porous partition walls. The partition walls are provided with a catalytic coating and have an increased flow resistance in a region at the downstream end of the filter, the partition walls in this region being of gastight design and the catalytic coating of the partition walls ending in a region upstream of the gastight region of the partition walls.