US3907964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for elimination of pollutants in auto-exhaust gas
Assignee: Wyeth Holdings LLC
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Filing: 1974-01-25
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Granted: 1975-09-23
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Expires: 1994-01-25
Abstract
Abstract There is disclosed a catalyst composition comprising a support material upon which is deposited an alkaline earth metal oxide, chrominum trioxide, and copper oxide in proportions which achieve desirable conversion temperatures and catalyst stability for use in a catalytic muffler for auto-exhaust gases. The method of catalyst preparation is also disclosed.
Inventors
- 👤 Robert Henry Whitman
- 👤 Jr Louis Leonard Lento
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
A PROCESS FOR OXIDIZING CARBON MONOXIDE AND HYDROCARBONS IN EXHAUST GASES EMANATING FROM INTERNAL COMBUSTION ENGINES WHICH COMPRISES CONTACTING SAID GASES WITH A CATALYST COMPOSITION COMPRISING A CALCINED SUPPORT MATERIAL SELECTED FROM ALUMINA, SILICA, MAGNESIA, ZIRCONIA, AND MIXTURES THEREOF CONTAINING DEPOSITED ON SAID SUPPORT FROM ABOUT 1.5% TO ABOUT 10% OF AN ALKALINE EARTH METAL OXIDE SELECTED FROM CALCIUM, BARIUM, STRONTIUM, AND MIXTURES THEREOF, FROM ABOUT 0.5 TO ABOUT 40% OF CHROMIC OXIDE, AND FROM ABOUT 1% TO ABOUT 12% OF COPPER OXIDE, SAID PERCENTAGES BEING BY WEIGHT BASED ON THE WEIGHT OF THE CALCINED SUPPORT AND SAID CATALYST COMPOSITION HAVING A 50% CONVERSION TEMPERATURE FOR HYDROCARBONS OF ABOUT 650*F. OR LESS, A 50% CONVERSION TEMPERATURE FOR CARBON MONOXIDE OF ABOUT 550*F. OR LESS, AND A SHRINKAGE OF 14% OR LESS UNDER CONDITIONS OF USE.
Claim 2
Dependent Claim
135 words
A PROCESS FOR OXIDIZING CARBON MONOXIDE AND HYDROCARBONS IN EXHAUST GASES EMANATING FROM INTERNAL COMBUSTION ENGINES WHICH COMPRISES CONTACTING SAID GASES WITH A CATALYST COMPOSITION COMPRISING A CALCINED SUPPORT MATERIAL SELECTED FROM ALUMINA, SILICA, MAGNESIA, ZIRCONIA, AND MIXTURES THEREOF CONTAINING DEPOSITED ON SAID SUPPORT FROM ABOUT 1.5% TO ABOUT 10% OF AN ALKALINE EARTH METAL OXIDE SELECTED FROM CALCIUM, BARIUM, STRONTIUM, AND MIXTURES THEREOF, FROM ABOUT 0.5 TO ABOUT 40% OF CHROMIC OXIDE, AND FROM ABOUT 1% TO ABOUT 12% OF COPPER OXIDE, SAID PERCENTAGES BEING BY WEIGHT BASED ON THE WEIGHT OF THE CALCINED SUPPORT AND SAID CATALYST COMPOSITION HAVING A 50% CONVERSION TEMPERATURE FOR HYDROCARBONS OF ABOUT 650*F. OR LESS, A 50% CONVERSION TEMPERATURE FOR CARBON MONOXIDE OF ABOUT 550*F. OR LESS, AND A SHRINKAGE OF 14% OR LESS UNDER CONDITIONS OF USE.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said support is alumina/silica 95/5.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein said alkaline earth metal oxide is calcium oxide.
Claim 5
Dependent Claim
20 words
The process of claim 3 wherein said calcium oxide is present in the range of about 2% to about 5%.
Claim 6
Dependent Claim
31 words
The process of claim 4 wherein chromium oxide is present in the range of about 1% to 14% and copper oxide is present in the range of about 2% to 9%.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein copper oxide is present at 5.25% and chromic oxide is present at 2.83%.
Claim 8
Dependent Claim
19 words
The process of claim 4 wherein copper oxide is present at 5.75% and chromic oxide is present at 3.5%.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |