Process for absorbing and desorbing nitrogen oxides in exhaust gases

US5851501A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Bernd Krutzsch · Köngen, DE
• Andrea Seibold · Blaustein, DE
• Leonhard Walz · Rastatt, DE
• Walter Boegner · Waiblingen, DE
• Martina Heinau · Ulm, DE
• Martin Hartweg · Erbach, DE
• Brigitte Konrad · Blaustein, DE

Key dates

• Filing date: May 9, 1996
• Grant date: Dec 22, 1998
• Expiry date: May 9, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B1/04
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A material and a process for adsorbing and desorbing nitrogen oxides in exhaust gas systems of engines running on a lean mixture, which does not require a prior oxidation step, wherein a mixed oxide which has an oxygen-rich orthorhombic structure is used which changes to an oxygen-poor tetragonal structure as a function of temperature.