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:
Jul. 03, 2007
Filed:
Dec. 30, 2003
Hungwen Jen, Troy, MI (US);
Gopichandra Surnilla, West Bloomfield, MI (US);
Christian Goralski, Jr., Ypsilanti, MI (US);
Joseph Theis, Rockwood, MI (US);
Justin Ura, Livonia, MI (US);
Hungwen Jen, Troy, MI (US);
Gopichandra Surnilla, West Bloomfield, MI (US);
Christian Goralski, Jr., Ypsilanti, MI (US);
Joseph Theis, Rockwood, MI (US);
Justin Ura, Livonia, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
The present invention provides a catalyst for use in a NOtrap that has reduced NOrelease during rich purges, increased NO conversion efficiency under stoichiometric conditions, and improved sulfur tolerance. The catalyst of this embodiment includes a precious metal, an oxygen storage component in contact with the precious metal, and a NOstorage material. The oxygen storage component in contact with the precious metal is present in an amount that provides sufficient oxygen storage capacity to reduce the NOrelease from the NOtrap during rich purges to less than 20% of the NOthat is stored in the NOtrap across the operating temperature window of the NOtrap, increase the NOconversion efficiency under stoichiometric conditions to a value greater than 70%, and increase the sulfur tolerance of the NOtrap.