Close coupled catalyst for purification of exhaust gas and the preparation thereof
US8207078B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2007 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Dec 18, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A close coupled three-way catalyst for purification of exhaust gas of motor vehicle and the preparation thereof. The support is selected from cordierite honeycomb ceramic materials having a pore volume of 0.25-0.35 ml/g. The coating layer is the mixture of hexaaluminate and perovskite-type composite oxide, cerium-zirconium solid solution, rare-earth oxide and alumina, alkali-earth oxide and zeolite having a high Si/Al ratio. The active components are palladium-rhodium, rare-earth oxide and transition metal in the hexaaluminate and perovskite-type composite oxide. The catalyst has not only the function of low-temperature catalytic oxidation of hydrocarbons, but also the function of reduction of nitrogen oxides, and can be used for purifying the exhaust gas of motor vehicles using gasoline, liquid gas, or CNG as fuel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.