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:
Aug. 31, 1976
Filed:
Jan. 29, 1974
Robert J Fedor, Westlake, OH (US);
Chin-Ho Lee, Lyndhurst, OH (US);
M Paul Makowski, Wickliffe, OH (US);
Gould Inc., Rolling Meadows, IL (US);
Abstract
A method and means for catalytically removing impurities found in the exhaust stream emanating from the internal combustion engine is provided. Such exhaust gases are initially brought into contact with a metallic oxidation catalyst at a temperature sufficient to cause a significant amount of the unreacted oxygen present to be removed therefrom by reacting it with oxidizable materials in the exhaust gases, with the oxidation catalyst employed being characterized by its lack of activity with respect to converting nitrogen and hydrogen found in exhaust gases into ammonia. The so-treated exhaust gases are then brought into contact with a nitrogen oxide (NO.sub.x) reducing catalyst, which is also characterized by its lack of activity with respect to converting nitrogen and hydrogen found in the exhaust gases into ammonia, at a temperature sufficient to cause nitrogen oxide gases in the exhaust gases to be catalytically reduced. Subsequently, the resultant exhaust gases are then brought into contact with an oxidation catalyst in an oxygen containing atmosphere at a temperature sufficient to cause carbon monoxide and gaseous hydrocarbons present in the exhaust gases to be oxidized to less harmful substances.