Patent · US Active

Reduction of N2O in the exhaust gas of lean-burn petrol engines

US9719446B2 · kind B2 · utility

0Cited by

7References

16Claims

0Family size

Assignee

UMICORE AG & CO. KG · DE

Inventors

Frank Adam · Alzenau, DE
Stephan Eckhoff · Alzenau, DE
Sebastian Mueller · Ludwigshafen, DE

Key dates

Filing date	Aug 20, 2014
Grant date	Aug 1, 2017
Priority date	—
Expiry date	Aug 20, 2034

Classification

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

Abstract

The present invention relates to the use of different regeneration strategies for nitrogen oxide storage catalysts (NOx storage catalyst, LNT or NSC), depending on the exhaust gas temperatures, to reduce in the total exhaust gas the greenhouse gas N2O (nitrous oxide) that is produced as a secondary emission during the regeneration of the storage catalyst. If the exhaust gas temperature is below 275° C.-290° C., regeneration takes place using a strategy with short pulses of around 2 seconds and λ Lambda 0.95 rich.

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