Stabilized and doubly promoted platinum group metal catalysts for emission control and method of making same
US4591580A · kind A · utility
30Cited by
10References
22Claims
0Family size
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Key dates
| Filing date | Jul 10, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Jul 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Alumina supported platinum-group metal catalysts exhibit exceptionally good performance and durability when the support is sequentially modified to include support stabilization by lanthana or lanthana-rich rare earth oxides, double promotion by ceria and alkali metal oxides, especially ceria along with lithia, and optionally nickel (oxide) as a base metal catalytic ingredient. For a pelleted Rh containing catalyst to exhibit such an outstanding performance at least part of the Rh component is added separately from any other Pt group metals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.