Patent · US Expired

Method of purifying a lean exhaust gas and catalytic system therefor

US6089015A · kind A · utility

30Cited by

16References

12Claims

0Family size

Assignee

Degussa-Huels AG · DE

Inventors

Wolfgang Strehlau · Großkrotzenburg, DE
Egbert Lox · Hanau, DE
Thomas Kreuzer · Karben, DE
Jurgen Hohne · Hanau, DE

Key dates

Filing date	May 14, 1998
Grant date	Jul 18, 2000
Priority date	—
Expiry date	May 14, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method of purifying the lean exhaust gas of lean mix engines or diesel engines. The exhaust gas is first contacted with a permanent reduction catalyst and subsequently contacted with a nitrogen oxide storage catalyst. This procedure yields a uniformly good conversion of pollutants of the exhaust gases under differing operating conditions both as regards the air ratios and the exhaust gas temperatures.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.