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. 21, 2014
Filed:
Mar. 18, 2009
Katja Adelmann, Darmstadt, DE;
Nicola Soeger, Nidderau, DE;
Marcus Pfeifer, Solingen, DE;
Wolfgang Schneider, Rodenbach, DE;
Gerald Jeske, Neuberg, DE;
Thomas Kreuzer, Wiesbaden, DE;
Katja Adelmann, Darmstadt, DE;
Nicola Soeger, Nidderau, DE;
Marcus Pfeifer, Solingen, DE;
Wolfgang Schneider, Rodenbach, DE;
Gerald Jeske, Neuberg, DE;
Thomas Kreuzer, Wiesbaden, DE;
Umicore AG & Co. KG, Hanau-Wolfgang, DE;
Abstract
An exhaust gas purification system (method and device) for the treatment of diesel exhaust gases containing nitrogen oxides and hydrocarbons is disclosed, which comprises the addition of ammonia or of a compound decomposable to ammonia into the exhaust gas stream and the subsequent leading of the exhaust gas stream over two successively arranged SCR catalysts with different properties and compositions. Both SCR catalysts are free of vanadium compounds and only the downstream SCR catalyst contains zeolite compounds. The exhaust gas purification system according to the invention is characterized by good 'kick-off' behavior at low temperatures and a simultaneously high conversion performance over a wide temperature range.