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. 20, 2009
Filed:
Jan. 09, 2007
Jifei Jia, El Cerrito, CA (US);
Kyle L. Fujdala, San Jose, CA (US);
Timothy J. Truex, Oxnard, CA (US);
Jifei Jia, El Cerrito, CA (US);
Kyle L. Fujdala, San Jose, CA (US);
Timothy J. Truex, Oxnard, CA (US);
Nanostellar, Inc., Redwood City, CA (US);
Abstract
An engine exhaust catalyst containing precious metal nanoparticles is promoted with bismuth. The bismuth promotion improves the catalyst's CO oxidation performance. Also, by varying the amount of bismuth that is added, the NO conversion rate that can be realized with the catalyst can be controlled. The control over the NO conversion rate is important because the passive regenerative performance of a particulate filter used in engine exhaust systems is based on the amount NOthat is present in the exhaust stream that reaches the particulate filter. The amount of NObeing produced needs to be optimized (not necessarily maximized) so that adequate particulate filter regeneration performance can be maintained while avoiding unused, toxic NOfrom being exhausted into the atmosphere.