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:
Nov. 16, 2004
Filed:
Apr. 10, 2001
Teuvo Maunula, Oulu, FI;
Kemira Metalkat Oy, Vihtavuori, FI;
Abstract
An adsorbent catalyst for reducing the amounts of nitrogen oxides, hydrocarbons and carbon monoxide contained in exhaust or combustion gases, which catalyst adsorbs nitrogen oxides, when the exhaust or combustion gases contain in excess of oxygen, and liberates and reduces the adsorbed nitrogen oxides, when the gases contain oxygen in stoichiometric amounts or less, which adsorbent catalyst include a porous support material the surface area of which is large and which contains at least the following: a first catalytic metal, which is preferably Pt, a first NO adsorbent, which preferably contains at least one of the following metals: Ba and Sr, a second NO adsorbent, which preferably contains at least one of the following metals: La and Y, and a redox NO adsorbent, which preferably contains at least one of the following metals: Ce, Zr, Ti, Nb, Mn, Pr, Nd, Sm, Eu and G. The invention also relates to methods for reducing the amounts of nitrogen oxides, hydrocarbons and carbon monoxide contained in exhaust or combustion gases.