Catalyst for decomposition of nitrogen oxides and method for purifying diesel engine exhaust gas by the use of the catalyst
US6193942A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Mar 2, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst which is capable of decomposing and allaying particularly NO.sub.x among other harmful components in the diesel engine exhaust gas and, at the same time, depriving by combustion the exhaust gas of carbonaceous particulates, unburned hydrocarbons, and carbon monoxide and a method for purifying the diesel engine exhaust gas by the use of this catalyst are provided. The catalyst for the decomposition of the nitrogen oxides has a refractory three-dimensional structure coated with a copper-containing zirconia powder having deposited copper and the catalytically active oxide of at least one metal selected from the group consisting of tungsten, gallium, nickel, manganese, iron, and cobalt on a zirconia powder. The method for purifying the diesel engine exhaust gas uses the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.