Patent · US Expired

Catalyst for purifying the exhaust gases of diesel engines, and process for the preparation thereof

US6685900B2 · kind B2 · utility

25Cited by

5References

21Claims

0Family size

Assignee

DMC, INC · DE

Inventors

Rainer Domesle · Alzenau, DE
Harald Klein · Bessenbach, DE
Thomas Kreuzer · Karben, DE
Egbert Lox · Hanau, DE

Key dates

Filing date	Feb 22, 2001
Grant date	Feb 3, 2004
Priority date	—
Expiry date	Jan 15, 2022

Classification

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

Abstract

A catalyst for purifying the exhaust gases of diesel engines, which catalyst contains at least one zeolite and, additionally, at least one of the support oxides aluminum oxide, silicon dioxide, titanium dioxide and aluminum silicate and at least one of the noble metals platinum, palladium, rhodium and iridium. In this catalyst the atoms of the noble metals have a mean oxidation number of less than +2.5, on average more than 3 metal ligands and less than 3 oxygen ligands and are present on the zeolites and support oxides in the form of crystallites having a mean particle size of from 1 to 6 nm.

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