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:
May. 26, 1992
Filed:
Dec. 14, 1989
Michael Baacke, Hanau, DE;
Reinhold Beand, Hanau, DE;
Bernd Engler, Hanau, DE;
Akos Kiss, Alzenau/Wasserlos, DE;
Peter Kleine-Mollhoff, Waldbuettelbrunn, DE;
Peter Kleinschmit, Hanau, DE;
Edgar Koberstein, Alzenau, DE;
Mustafa Siray, Hanau, DE;
Degussa Aktiengesellschaft, , DE;
Abstract
A zeolite catalyst and a method for reduction of nitrogen oxides present in waste gas streams is described. The method includes mixing the waste gas containing nitrogen oxides with ammonia. At an elevated temperature, this mixture is passed over a zeolite catalyst. Preferably, the zeolite catalyst is in a monolithic or honeycomb form. The zeolite catalyst includes one or more of the following subgroup metals: copper, iron, molybdeum and cerium. The zeolite catalysts made in accordance with this invention show better conversion of nitrogen oxides and longer life than known catalysts.