Catalyst for purification of exhaust gas from diesel engine
US6265342A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2000 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Mar 6, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/20761
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst for purifying exhaust gases from diesel engines with an improved purification efficiency for both nitrogen oxide and particulates in exhaust emissions is provided. The catalyst includes: (i) a first catalytic layer containing a carrier portion including iron (Fe)-doped modified zirconium dioxide, and a catalyst portion including a material selected from the group consisting of copper (Cu), copper oxide, and mixtures thereof, and (ii) a second catalytic layer containing a carrier portion including Cu-doped modified zirconium dioxide, a main catalyst portion including platinum (Pt) and tin (Sn), and a co-catalyst portion including copper oxide. The catalyst portion of the first catalytic layer may contain palladium (Pd) instead of Cu.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.