US3929965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual purpose auto exhaust catalysts
Assignee: WR Grace and Co
•
Filing: 1974-05-16
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Granted: 1975-12-30
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Expires: 1994-05-16
Abstract
Abstract A process is described for the manufacture of a catalyst for converting the carbon monoxide, hydrocarbons, and nitrogen oxides which appear in the exhaust from automobiles to harmless carbon dioxide, water, and nitrogen. The catalyst consists of a simple mixture of two catalytic compositions. The major component of the mixture is capable of reducing nitrogen oxides and the minor component of oxidizing hydrocarbons and carbon monoxide. The use of this mixture shows unexpected synergistic activity for the removal of carbon monoxide and hydrocarbons without sacrificing the activity for nitrogen oxide removal.
Inventors
- 👤 Gwan Kim
- 👤 Michael Vance Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/89; B01J23/8933; B01J23/894; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A METHOD OF CONVERTING THE NOXIOUS COMPONENTS OF WXHAUST GASES TO INNOCUOUS ENTITIES WHICH COMPRISES CONTACTING SAID GASES, HAVING CARBON MONOXIDE TO OXYGEN RATIOS OF 2 TO 10 WITH A CATALYST CONSISTING ESSENTIALLY OF A MIXTURE OF TWO CATALYSTS IN WHICH 70 TO 90 PERCENT OF THE MIXTURE IS A REDUCING CATALYST CONSISTING ESSENTIALLY OF FROM 0.01 TO 5 WEIGHT PERCENT PALLADIUM AND FROM 0.004 TO 2 WEIGHT PERCENT RHODIUM AND FROM 5 TO 80 PERCENT BY WEIGHT NICKEL OXIDE; AND IN WHICH 10 TO 30 WEIGHT PERCENT OF THE MIXTURE IS AN OXIDATION CATALYST CONSISTING ESSENTIALLY OF 0.01 TO 5 WEIGHT PERCENT PLATINUM AND FROM 0.01 TO 5 WEIGHT PERCENT PALLADIUM, WHEREIN SAID CATALYSTS ARE DISTENDED ON ALUMINA SUPPORTS CONTAINING 1 TO 30 WEIGHT PERCENT CERIA.
Claim 2
Independent Claim
127 words
A METHOD OF CONVERTING THE NOXIOUS COMPONENTS OF WXHAUST GASES TO INNOCUOUS ENTITIES WHICH COMPRISES CONTACTING SAID GASES, HAVING CARBON MONOXIDE TO OXYGEN RATIOS OF 2 TO 10 WITH A CATALYST CONSISTING ESSENTIALLY OF A MIXTURE OF TWO CATALYSTS IN WHICH 70 TO 90 PERCENT OF THE MIXTURE IS A REDUCING CATALYST CONSISTING ESSENTIALLY OF FROM 0.01 TO 5 WEIGHT PERCENT PALLADIUM AND FROM 0.004 TO 2 WEIGHT PERCENT RHODIUM AND FROM 5 TO 80 PERCENT BY WEIGHT NICKEL OXIDE; AND IN WHICH 10 TO 30 WEIGHT PERCENT OF THE MIXTURE IS AN OXIDATION CATALYST CONSISTING ESSENTIALLY OF 0.01 TO 5 WEIGHT PERCENT PLATINUM AND FROM 0.01 TO 5 WEIGHT PERCENT PALLADIUM, WHEREIN SAID CATALYSTS ARE DISTENDED ON ALUMINA SUPPORTS CONTAINING 1 TO 30 WEIGHT PERCENT CERIA.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein, the catalyst composition is distended upon a pellet-type support.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |