Process for regenerating the catalytic activity of a catalyst that is located in the exhaust gas line of a diesel engine and that has at least one oxidizing function

US6691509B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Michael Hoffman · San Diego, US
• Harald Klein · Bessenbach, DE
• Thomas Kreuzer · Karben, DE

Key dates

• Filing date: Jan 24, 2002
• Grant date: Feb 17, 2004
• Expiry date: Jan 24, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The present invention provides a process for regenerating the catalytic activity of catalysts that have oxidizing functions. A catalyst that is located in the exhaust gas line of a diesel engine that preferably contains a catalytically active coating on a honeycomb carrier that does not have a filter function and that has at least one oxidizing function is regenerated. As a result of time-restricted increases in the exhaust gas temperature upstream of the catalyst to a value greater than 450° C., the combustion of soot particles and hydrocarbons deposited on the catalyst is initiated, and thus, the catalytic activity of the catalyst is at least partly regenerated.