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. 16, 2005
Filed:
Feb. 14, 2003
Eberhard Jacob, Krailing, DE;
Sebastian Käfer, Kircheimbolanden, DE;
Werner Müller, Kaiserslautern, DE;
Andreas Lacroix, Weidenthal, DE;
Andreas Herr, Kaiserslautern, DE;
Eberhard Jacob, Krailing, DE;
Sebastian Käfer, Kircheimbolanden, DE;
Werner Müller, Kaiserslautern, DE;
Andreas Lacroix, Weidenthal, DE;
Andreas Herr, Kaiserslautern, DE;
MAN Nutzfahrzeuge AG, , DE;
Abstract
A method is provided for producing ammonia (NH) and introducing the produced ammonia (NH) into an exhaust gas stream as a reduction means for selectively catalytically reducing nitrogen oxides contained in the exhaust gas stream, which is an exhaust stream generated by the combustion process of a motor, a gas turbine, or a burner. The method comprises feeding dry urea from a supply container in a controlled amount to reactor and subjecting the dry urea in the reactor to a sufficiently rapid thermal treatment such that a gas mixture comprising the reaction products of ammonia (NH) and isocyanic acid (HCNO) is created. Also, the method comprises immediately catalytically treating the thus produced gas mixture in the presence of water such that the isocyanic acid (HCNO) resulting from the rapid thermal treatment is converted, via quantitative hydrolysis treatment, into ammonia (NH) and carbon dioxide (CO).