Patent · US Active

Catalyst system for reducing nitrogen oxides

US10443463B2 · kind B2 · utility

8Cited by

5References

14Claims

0Family size

Assignee

UMICORE AG & CO. KG · DE

Inventors

Ruediger Hoyer · Alzenau, DE
Thomas UTSCHIG · Frankfurt am Main, DE
Michael Schiffer · Hanau, DE
Michael Seyler · Rodenbach, DE
Frank-Walter Schuetze · Haibach, DE

Key dates

Filing date	Aug 12, 2015
Grant date	Oct 15, 2019
Priority date	—
Expiry date	Aug 12, 2035

Classification

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

Abstract

The invention relates to a catalyst system for reducing nitrogen oxides, which comprises a nitrogen oxide storage catalyst and an SCR catalyst, wherein the nitrogen oxide storage catalyst consists of at least two catalytically active washcoat layers on a supporting body, wherein a lower washcoat layer A contains cerium oxide, an alkaline earth compound and/or alkali compound, as well as platinum and palladium, and an upper washcoat layer B, which is arranged over the washcoat layer A, contains cerium oxide, platinum and palladium, and no alkali compound and no alkaline earth compound. The invention also relates to a method for converting NOx in exhaust gases of motor vehicles that are operated by means of engines that are operated in a lean manner.

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