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:
Sep. 25, 2007
Filed:
Oct. 25, 2005
Kenneth B. Gross, Troy, MI (US);
Steven J. Schmieg, Troy, MI (US);
Byong K. Cho, Rochester Hills, MI (US);
Jerome P. Ortmann, Sterling Heights, MI (US);
Daniel Dziedzic, Rochester Hills, MI (US);
Thomas J. Chapaton, Sterling Heights, MI (US);
Kenneth B. Gross, Troy, MI (US);
Steven J. Schmieg, Troy, MI (US);
Byong K. Cho, Rochester Hills, MI (US);
Jerome P. Ortmann, Sterling Heights, MI (US);
Daniel Dziedzic, Rochester Hills, MI (US);
Thomas J. Chapaton, Sterling Heights, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
The nitric oxide (NO) and nitrogen dioxide (NO) content of lean-burn engine exhaust is beneficially prepared for selective catalytic reduction (SCR) of these oxides to nitrogen by two sidestream additions to the exhaust. An ozone-containing air stream is added to the exhaust to affect oxidation of NO to NO. And a hydrocarbon(s) fuel constituent is added to a second humidified ozone-containing air stream and that mixture subjected to UV radiation. Strongly oxidizing hydroxyl radicals are formed by interaction of ozone, water, and UV radiation for reaction with the hydrocarbon. The resulting partially oxidized hydrocarbons (Pox) are added to the exhaust, providing effective reduction materials for the SCR of NOto nitrogen and water.