Methods and devices for scrubbing gases

US5965098A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Walter Boegner · Waiblingen, DE
• Rolf-Dirc Roitzheim · Blaustein, DE
• Martin Hartweg · Erbach, DE
• Andrea Seibold · Blaustein, DE
• Thomas Fetzer · Speyer, DE
• Bernd Morsbach · Ludwigshafen, DE

Key dates

• Filing date: Feb 24, 1997
• Grant date: Oct 12, 1999
• Expiry date: Feb 24, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2610/03
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a method and a device for cleaning flowing gases. To reduce the total emissions, nitrogen oxides, especially NO and NOx, are extracted at least partially from the gas to be scrubbed, in the temperature range from 50 and 300.degree. C., preferably between 50 and 150.degree. C. To extract the nitrogen oxides, an intermediate storage medium is used that is composed of a storage material and a supporting material for the storage material. The intermediate storage medium having in particular a composition of the formal chemical formula Ag.CuAl.sub.2 O.sub.4 in an Al.sub.2 O.sub.3 matrix, with the composition being a spinel or being of the spinel type, and with the composition having characteristic spinel lines in the x-ray spectrum, where 0.ltoreq.x<1.