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:
Aug. 17, 1999
Filed:
Feb. 07, 1997
Jeffrey Scott Hepburn, Dearborn, MI (US);
William Lewis Watkins, Toledo, OH (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
The invention is a nitrogen oxide trap comprising a porous support; and catalysts comprising platinum and either sodium, potassium, or their mixture loaded on the porous support. The sodium, potassium, or sodium/potassium mixture is present in a significantly high loading of at least 30 weight percent, and the platinum comprises 0.2-3 weight percent, based on the weight of the porous support. The trap may be used in an internal combustion engine exhaust gas catalyst system. During lean-burn operation of the engine the trap sorbs nitrogen oxides (NOx) and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas, the desorbed NOx being converted to N.sub.2 and O.sub.2.