Layered catalyst composite
US5948723A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Oct 31, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst composition and layered catalyst composite of the type generally referred to as a three-way conversion catalyst having the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. The catalyst composition comprises at least two supports, at least one first precious metal component. There is at least one lanthana stabilized alumina support, and at least one refractory oxide unstabilized support. The composition further comprises at least one precious metal component located on the lanthana stabilized alumina support and the unstabilized support. There is an oxygen storage composition comprising, 40 to 80 weight percent of a diluent component, 10 to 60 weight percent of a cerium component, 1 to 15 weight percent of a neodymium component, and 1 to 15 weight percent of a praseodymium component. The composition also comprises at least one alkaline earth metal stabilizer; and a zirconium component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.