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:
Dec. 24, 2002
Filed:
Aug. 22, 2000
Michel Deeba, East Brunswick, NJ (US);
Uwe Dahle, Garbsen, DE;
Stefan Brandt, Braunschweig, DE;
John K. Hochmuth, Bridgewater, NJ (US);
Engelhard Corporation, Iselin, NJ (US);
Abstract
A catalytic trap ( ) effective for conversion of NO in an exhaust gas stream is inert to high-temperature reaction with basic oxygenated compounds of lithium, sodium or potassium. The catalytic trap may be substantially free of silica components and may include a catalytic trap material ( ) which contains a refractory metal oxide support, e.g., alumina, having dispersed thereon a catalytic component, such as a platinum group metal catalytic component, and a NO sorbent comprised of one or more of the basic oxygenated compounds. The catalytic trap material is coated onto a suitable carrier member ( ), such as one made from stainless steel, titanium, alumina, titania, zirconia or silica-leached cordierite. A method of treating a NO -containing gas stream involves maintaining the gas stream in alternating periods of ( ) lean and ( ) rich or stoichiometric conditions and contacting the gas stream with the catalytic trap under conditions in which NO is adsorbed during periods of lean operation and released and reduced to nitrogen during periods of rich operation.