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:
Oct. 02, 2001
Filed:
Mar. 29, 2000
Jeffrey Scott Hepburn, Birmingham, MI (US);
John Denari, Dearborn, MI (US);
William Lewis Henderson Watkins, Toledo, OH (US);
Ford Global Technologies, Inc, Dearborn, MI (US);
Abstract
A method for manufacturing a NOx absorbent useful to purge exhaust gases during lean-burn internal combustion engine operation. The material is resistant to sulfur poisoning hence improving the long term NOx absorption efficiency. The method comprises providing an alumina/ceria support with barium and precious metal of at least platinum and then overcoating with a layer of lithium. The absorbent can be used in the exhaust gas system and subjected to lean operation when the nitrogen oxides are absorbed and then to stoichiometric or rich A/F operation which causes the nitrogen oxide to desorb and then they are reduced over the precious metal.