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:
Feb. 03, 2004
Filed:
Jan. 06, 2000
Bernardino M. Penetrante, San Ramon, CA (US);
Raymond M. Brusasco, Livermore, CA (US);
Bernard T. Merritt, Livermore, CA (US);
George E. Vogtlin, Fremont, CA (US);
The Regents of the University of California, Oakland, CA (US);
Abstract
A high-surface-area (greater than 600 m2/g), large-pore (pore size diameter greater than 6.5 angstroms), basic zeolite having a structure such as an alkali metal cation-exchanged Y-zeolite is employed to convert NO contained in an oxygen-rich engine exhaust to N and O . Preferably, the invention relates to a two-stage method and apparatus for NO reduction in an oxygen-rich engine exhaust such as diesel engine exhaust that includes a plasma oxidative stage and a selective reduction stage. The first stage employs a non-thermal plasma treatment of NO gases in an oxygen-rich exhaust and is intended to convert NO to NO in the presence of O and added hydrocarbons. The second stage employs a lean-NO catalyst including the basic zeolite at relatively low temperatures to convert such NO to environmentally benign gases that include N , CO , and H O.