US4233189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst of rhodium on zirconia
Assignee: Ford Motor Co
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Filing: 1979-03-12
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Granted: 1980-11-11
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Expires: 1999-03-12
Abstract
Abstract A catalyst system and method of making the same is taught for treating exhaust gases from an internal combustion engine. A catalyst system includes a substrate and a washcoat on the substrate. The washcoat is formed of zirconia. A catalyst is placed on the washcoat consisting of rhodium metal or rhodium metal with another catalyst metal. By using zirconia as a washcoat, the rhodium is not dissolved into the washcoat during periods when the catalyst system is subjected to high temperature oxidizing conditions, as is the case when a gamma alumina washcoat is used.
Inventors
- 👤 Haren S. Gandhi
- 👤 Joseph T. Kummer
- 👤 Mordecai Shelef
- 👤 Henryk K. Stepien
- 👤 Hsien C. Yao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:08
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/464; B01J37/00; B01J37/02; B01J37/024; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
A catalyst system which comprises: a substrate; a washcoat on said substrate, said washcoat consisting essentially of zirconia; and a catalyst on said washcoat, said catalyst consisting essentially of rhodium.
Claim 2
Dependent Claim
30 words
A catalyst system which comprises: a substrate; a washcoat on said substrate, said washcoat consisting essentially of zirconia; and a catalyst on said washcoat, said catalyst consisting essentially of rhodium.
Claim 3
Independent Claim
48 words
A method of reducing the migration of rhodium into a washcoat of a catalyst system which comprises the following steps: selecting a substrate; applying a washcoat on said substrate, said washcoat consisting essentially of zirconia; and applying a catalyst on said washcoat, said catalyst consisting essentially of rhodium.
Claim 4
Independent Claim
48 words
A method of reducing the migration of rhodium into a washcoat of a catalyst system which comprises the following steps: selecting a substrate; applying a washcoat on said substrate, said washcoat consisting essentially of zirconia; and applying a catalyst on said washcoat, said catalyst consisting essentially of rhodium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |