Device for reducing exhaust gas contaminants, particularly for motor vehicles

US5413766A · kind A · utility

Assignee

• Leistritz AG & Co. Abgastechnik · DE

Inventors

• Dieter Dattge · Rothenbürg, DE
• Walter Stoepler · Herzogenaurach, DE

Key dates

• Filing date: May 11, 1993
• Grant date: May 9, 1995
• Expiry date: May 11, 2013

Classification

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

Abstract

A device for reducing contaminants, particularly for motor vehicles, includes a housing, a catalyst body disposed therein with its periphery spaced from the housing wall and an intumescent mat disposed in the gap between the housing wall and the catalyst body. The intumescent mat is a mat of a heat-resistant fiber mat with embedded expansion particles whose volume increases when a certain expansion temperature is reached that is produced by the hot exhaust gases. By providing an additional heating element in the gap between the housing and the catalyst body, the intumescent mat can be heated to the expansion temperature.