Catalyst for treating exhaust gases, method for producing the same, and method for treating exhaust gases
US8258075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Jul 21, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J35/615
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To provide a catalyst for treating exhaust gases containing nitrogen monoxide, carbon monoxide and volatile organic compounds whose oxidation power has been enhanced without increasing the amount of precious metal supported thereon; a method for producing the same; and a method for treating exhaust gases. A catalyst for treating exhaust gases, including coat layers made up of a plurality of layers, an upper layer of which has an active component contained uniformly therein and a lower layer of which has no active component contained therein, can be obtained through the steps of: forming the lower layer by coating the surface of substrate with a slurry of a porous inorganic compound, followed by drying; and forming the upper layer, which is to be the top surface of the catalyst, by coating the surface of the lower layer with a slurry of a porous inorganic compound that has the active component composed of one or more precious metals supported thereon, followed by drying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.