Patent · US Active

Method of depleting nitrous oxide in exhaust gas after-treatment for lean-burn engines

US8512658B2 · kind B2 · utility

9Cited by

19References

17Claims

0Family size

Assignee

UMICORE AG & CO. KG · DE

Inventors

Stephan Eckhoff · Alzenau, DE
Frank Adam · Alzenau, DE
Christian LAMMARCK · Großkrotzenburg, DE

Key dates

Filing date	Apr 5, 2011
Grant date	Aug 20, 2013
Priority date	—
Expiry date	Apr 5, 2031

Classification

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

Abstract

The present invention relates to a method for exhaust gas after-treatment for essentially lean-burn internal combustion engines and also a corresponding advantageous exhaust gas after-treatment system. In particular, the present invention relates to reducing the proportion of the greenhouse gas N20 in the total exhaust gas from a corresponding internal combustion system using at least one NOx storage catalyst as exhaust gas purification element. The objective of the invention is to operate the N20 depletion catalyst located downstream of the NOx storage catalyst under lambda=<1 conditions when the N20 formed by the NOx storage catalyst reaches the N20 depletion catalyst.

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