Process for checking the operability of an exhaust gas purification catalyst

US6739176B2 · kind B2 · utility

Assignee

• DMC2 Degussa Metal Catalysts Cerdec AG · DE

Inventors

• Ulrich Neuhausen · Kahl am Main, DE
• Harald Klein · Bessenbach, DE
• Egbert Lox · Hanau, DE
• Jurgen Gieshoff · Bad Orb, DE
• Thomas Kreuzer · Karben, DE

Key dates

• Filing date: Mar 16, 2001
• Grant date: May 25, 2004
• Expiry date: Mar 28, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A process for checking the operability of an exhaust gas purification catalyst for diesel engines, which has a light-off temperature and a degree of conversion rCO for carbon monoxide (CO), by direct measurement of the carbon monoxide concentration in combination with a temperature measurement. To evaluate the remaining catalytic activity of the catalyst the difference &Dgr;T between the current catalyst exit temperature TE of the exhaust gas and the light-off temperature TCO,50%,fresh of the fresh catalyst for carbon monoxide stored as a function of the speed and load&Dgr;T=TE−TCO,50%,freshis determined and the degree of conversion rCO for carbon monoxide is ascertained.