The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 2003
Filed:
Jul. 01, 1999
Hans van den Tillaart, Freigericht, DE;
Jürgen Leyrer, Rheinfelden, DE;
Wolfgang Strehlau, Grosskrotzenburg, DE;
Egbert Lox, Hanau, DE;
Thomas Kreuzer, Karben, DE;
Carsten Plog, Markdorf, DE;
Renato Andorf, Meckenbeuren, DE;
Norbert Markert, Immenstaad, DE;
Thomas Stengel, Friedrichshafen, DE;
Degussa-Huls Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A catalyst for reducing nitrogen oxides in oxidizing and reducing atmospheres which contains iridium on a support material. Silicon dioxide or a dealuminized zeolite in the acid H form with a modulus of more than 20, preferably more than 100, or mixtures thereof are used as support materials. Iridium is deposited on the external surfaces of these support materials with average particle sizes between 10 and 30 nm. The catalyst is particularly suitable for treating exhaust gases from lean-burn gasoline engines or from diesel engines.