US3903020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized automotive exhaust gas catalyst
Assignee: WR Grace and Co Conn
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Filing: 1974-02-15
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Granted: 1975-09-02
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Expires: 1994-02-15
Abstract
Abstract A process for preparing an ultra stable catalyst capable of converting the noxious components in exhaust gases to innocuous entities is described. The catalyst is made by applying a solution of a salt of a noble metal such as palladium or platinum to a specially prepared support followed by activation at 1,800*2,100*F. The special support is prepared by activating and stabilizing common support materials such as alumina with cerium oxide at high temperatures prior to application of the noble metal. The catalyst is stable to 2,100*F.
Inventors
- 👤 Frank John Sergeys
- 👤 James Michael Maselli
- 👤 Michael Vance Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/54; B01J23/56; B01J23/63; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A CATALYST FOR THE CONVERSION OF THE NOXIOUS COMPONENTS IN EXHAUST GASES TO INNOCUOUS ENTITIES CHARACTERIZED BY: A. THE ABILITY TO RETAIN ESSENTIALLY ALL ITS CATALYTIC ACTIVITY AFTER EXPOSURE TO TEMPERATURES OF 1,800*-2,000*F FOR EXTENDED PERIODS OF TIME, B. A SHRINKAGE OF LESS THAN 1% AFTER HEATING TO 1,800*F FOR PERIODS OF 10 TO 24 HOURS, WHICH COMPRISES 0.01 TO 1 WEIGHT PERCENT OF A NOBLE METAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, PALLADIUM, AND MIXTURES THEREOF DISTENDED ON A SUPPORT CONTAINING 2-50% OF CERIUM OXIDE.
Claim 2
Dependent Claim
87 words
A CATALYST FOR THE CONVERSION OF THE NOXIOUS COMPONENTS IN EXHAUST GASES TO INNOCUOUS ENTITIES CHARACTERIZED BY: A. THE ABILITY TO RETAIN ESSENTIALLY ALL ITS CATALYTIC ACTIVITY AFTER EXPOSURE TO TEMPERATURES OF 1,800*-2,000*F FOR EXTENDED PERIODS OF TIME, B. A SHRINKAGE OF LESS THAN 1% AFTER HEATING TO 1,800*F FOR PERIODS OF 10 TO 24 HOURS, WHICH COMPRISES 0.01 TO 1 WEIGHT PERCENT OF A NOBLE METAL SELECTED FROM THE GROUP CONSISTING OF PLATINUM, PALLADIUM, AND MIXTURES THEREOF DISTENDED ON A SUPPORT CONTAINING 2-50% OF CERIUM OXIDE.
Claim 3
Dependent Claim
30 words
The catalyst according to claim 1 wherein the catalyst consists essentially of: 0.01 to 0.5 weight percent Pd; 2 to 10 weight percent cerium oxide distended on nodules of alumina.
Claim 4
Dependent Claim
22 words
The catalyst according to claim 1 wherein the catalyst support is selected from the group consisting of mullite, spinel, silica, or alumina.
Claim 5
Dependent Claim
87 words
A catalyst system for the conversion of the noxious components in exhaust gases to innocuous entities which comprises a monolithic support having 0.05 to 5 weight percent of a noble metal selected from the group consisting of platinum, palladium, and mixtures thereof and 2 to 50 weight percent of cerium oxide on a catalyst support distended on said monolith, said catalyst system being characterized by the ability to retain essentially all the catalytic activity after exposure to temperatures in excess of 1,800*F for extended periods of time.
Claim 6
Dependent Claim
87 words
A catalyst system for the conversion of the noxious components in exhaust gases to innocuous entities which comprises a monolithic support having 0.05 to 5 weight percent of a noble metal selected from the group consisting of platinum, palladium, and mixtures thereof and 2 to 50 weight percent of cerium oxide on a catalyst support distended on said monolith, said catalyst system being characterized by the ability to retain essentially all the catalytic activity after exposure to temperatures in excess of 1,800*F for extended periods of time.
Claim 7
Dependent Claim
24 words
The catalyst system according to claim 4 wherein the monolith, exclusive of the catalyst coating consists essentially of spodumene, cordierite, mullite, spinel, or alumina.
Claim 8
Dependent Claim
23 words
The catalytic system according to claim 4 wherein the catalyst support is selected from the group consisting of alumina, silica, mullite, and spinel.
Claim 9
Dependent Claim
25 words
The catalyst system according to claim 4 wherein the catalyst support is alumina activated and stabilized by the addition of 2-50 weight percent cerium oxide.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |