Patent · US Expired

Catalyst for lowering the amount of nitrogen oxides in the exhaust gas from lean burn engines

US6858193B2 · kind B2 · utility

29Cited by

9References

24Claims

0Family size

Assignee

UMICORE AG & CO. KG · DE

Inventors

Lutz Marc Ruwisch · Darmstadt, DE
Ulrich Göbel · Hattersheim, DE
Juliane Theis · Karlstein, DE
Rainer Domesle · Alzenau, DE

Key dates

Filing date	Nov 27, 2002
Grant date	Feb 22, 2005
Priority date	—
Expiry date	Nov 27, 2022

Classification

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

Abstract

The invention relates to a catalyst for lowering the amount of NOx in the lean exhaust gas from lean burn engines, comprising active aluminum oxide, magnesium oxide and at least one noble metal of the platinum group of the periodic table of the elements, as well as at least one nitrogen oxide storage material. The catalyst is characterized in that the magnesium oxide forms a homogeneous mixed oxide with aluminum oxide and is present in a concentration of about 1 to about 40 wt.-%, based on the total weight of the mixed oxide.

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