US3928237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of catalyst preparation for use in suppressing hydrocarbon and carbon monoxide emission from internal combustion engines
Assignee: Individual
•
Filing: 1973-08-20
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Granted: 1975-12-23
•
Expires: 1993-08-20
Abstract
Abstract A method of lowering undesirable vehicle exhaust emissions includes preparing a catalyst for use in the exhaust stream of the vehicle. The method includes preparing a solution of an ammonia metal complex, applying the complex to an alumina substrate, heating the substrate to remove water and ammonia, and converting the metal to its active form. Additional metals may be complexed in a similar manner and deposited on separate substrates and the separate substrates may then be mixed to achieve any desired proportion of the metal catalysts.
Inventors
- 👤 Robert E Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:47
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01J37/082; B01J37/086; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
90 words
A METHOD OF PREPARING A CATALYST ON A SUBSTRATE FOR USE IN SUPPRESSING HYDROCARBON AND CARBONMONOXIDE EMISSION FROM INTERNAL COMBUSTION ENGINES COMPRISING TAKING A SOLUTION CONTAINING DISSOLVED PLATINUM, COMPLEXING THE PLATINUM BY ADDING AMMONIA TO THE SOLUTION, CONTACTING AN AMOUNT OF SUBSTRATE WITH THE SOLUTION SO THAT THE SUBSTRATE ABSORBS THE SOLUTION, AND HEATING THE SUBSTRATE TO REMOVE AMMONIA AND WATER TO PROVIDE A CATALYST, THEAMOUNT OF SUBSTRATE ADDED TO THE SOLUTION BEING SUCH THAT THE WEIGHT OF THE CATALYST. SOLUTION IS ABOUT 0.1% OF THE WEIGHT OF THE CATALYST.
Claim 2
Independent Claim
90 words
A METHOD OF PREPARING A CATALYST ON A SUBSTRATE FOR USE IN SUPPRESSING HYDROCARBON AND CARBONMONOXIDE EMISSION FROM INTERNAL COMBUSTION ENGINES COMPRISING TAKING A SOLUTION CONTAINING DISSOLVED PLATINUM, COMPLEXING THE PLATINUM BY ADDING AMMONIA TO THE SOLUTION, CONTACTING AN AMOUNT OF SUBSTRATE WITH THE SOLUTION SO THAT THE SUBSTRATE ABSORBS THE SOLUTION, AND HEATING THE SUBSTRATE TO REMOVE AMMONIA AND WATER TO PROVIDE A CATALYST, THEAMOUNT OF SUBSTRATE ADDED TO THE SOLUTION BEING SUCH THAT THE WEIGHT OF THE CATALYST. SOLUTION IS ABOUT 0.1% OF THE WEIGHT OF THE CATALYST.
Claim 3
Dependent Claim
19 words
The method of claim 1 in which the substrate is heated at a temperature of less than 1,000* F.
Claim 4
Dependent Claim
17 words
The method of claim 2 in which the substrate is heated for about 20 to 25 minutes.
Claim 5
Dependent Claim
33 words
The method of claim 2 in which the substrate is first heated at a temperature of about 550* F. and is then heated at a temperature of about 750* F. to 1,000* F.
Claim 6
Dependent Claim
33 words
The method of claim 2 including the step of dissolving chromium in the solution prior to the contacting step, the amount of chromium being less than about 0.1% by weight of the catalyst.
Claim 7
Independent Claim
129 words
A method of preparing a catalyst for use in suppressing hydrocarbon and carbon monoxide emission from internal combustion engines comprising a. taking a solution containing dissolved platinum, complexing the platinum-containing solution by adding ammonia to the solution, contacting a first substrate with the platinum-containing solution so that the first substrate absorbs platinum, and heating the platinum-containing first substrate to remove ammonia and water, b. taking a solution containing dissolved palladium, complexing the palladium-containing solution by adding ammonia to the solution, contacting a second substrate with the palladium-containing solution so that the second substrate absorbs palladium, and heating the palladium-containing second substrate to remove ammonia and water, c. placing the platinum-containing first substratE and the palladium-containing second substrate in the path of an exhaust stream of an internal combustion engine.
Claim 8
Independent Claim
129 words
A method of preparing a catalyst for use in suppressing hydrocarbon and carbon monoxide emission from internal combustion engines comprising a. taking a solution containing dissolved platinum, complexing the platinum-containing solution by adding ammonia to the solution, contacting a first substrate with the platinum-containing solution so that the first substrate absorbs platinum, and heating the platinum-containing first substrate to remove ammonia and water, b. taking a solution containing dissolved palladium, complexing the palladium-containing solution by adding ammonia to the solution, contacting a second substrate with the palladium-containing solution so that the second substrate absorbs palladium, and heating the palladium-containing second substrate to remove ammonia and water, c. placing the platinum-containing first substratE and the palladium-containing second substrate in the path of an exhaust stream of an internal combustion engine.
Claim 9
Dependent Claim
31 words
The method of claim 6 in which the weight of platinum absorbed by the first substrate is about 0.1% of the weight of the platinum-containing first substrate after the heating step.
Claim 10
Dependent Claim
27 words
The method of claim 6 in which the heating of both the first and second substrates is carried out at a temperature of less than 1,000* F.
Claim 11
Dependent Claim
55 words
The method of claim 6 in which the first substrate comprises a first group of pellets and the second substrate comprises a second group of pellets, the method including the step of mixing the platinum-containing first group of pellets and the palladium-containing second group of pellets before the pellets are placed in the exhaust stream.
Claim 12
Dependent Claim
35 words
The method of claim 9 in which the weight of platinum absorbed by the first group of pellets is about 0.1% of the weight of the platinum-containing first group of pellets after the heating step.
Claim 13
Dependent Claim
57 words
The method of claim 9 in which the weight of platinum absorbed by the first group of pellets is about 0.1% of the weight of the platinum-containing first group of pellets after the heating step, the heating of both the first and second groups of pellets being carried out at a temperature of less than 1000* F.
Claim 14
Dependent Claim
50 words
The method of claim 6 including the step of dissolving chromium in one of the solutions prior to the step of contacting substrate with the solution, the weight of chromium being less than about 0.1% of the weight of the substrate contacted with said one solution after the heating step.
Claim 15
Dependent Claim
47 words
A CATALYST FOR REDUCING HYDROCARBON AND CARBON MONOXIDE EMISSION FROM INTERNAL COMBUSTION ENGINES COMPRISING A PLURALITY OF PELLETS, SOME OF THE PELLETS CONTAINING PLATINUM BUT NOT PLALLADIUM AND SOME OF THE PELLETS CONTAINING PALLADIUM BUT NOT PATINUM, THE PLATINUM-CONTAINING PELLETS AND THE PALLADIUM-CONTAINING PELLETS BEING MIXED TOGETHER.
Claim 16
Dependent Claim
47 words
A CATALYST FOR REDUCING HYDROCARBON AND CARBON MONOXIDE EMISSION FROM INTERNAL COMBUSTION ENGINES COMPRISING A PLURALITY OF PELLETS, SOME OF THE PELLETS CONTAINING PLATINUM BUT NOT PLALLADIUM AND SOME OF THE PELLETS CONTAINING PALLADIUM BUT NOT PATINUM, THE PLATINUM-CONTAINING PELLETS AND THE PALLADIUM-CONTAINING PELLETS BEING MIXED TOGETHER.
Claim 17
Dependent Claim
28 words
The catalyst of claim 13 in which the total weight of platinum contained by the platinum-containing pellets is about 0.1% of the total weight of the platinum-containing pellets.
Claim 18
Dependent Claim
13 words
The catalyst of claim 13 in which the pellets are made of alumina.
References Cited (Backward Citations)
US2760940A
Cited
US2780603A
Cited
US2895905A
Cited
US3218268A
Cited
US3291564A
Cited
US3295918A
Cited
US3272760A
Cited
US3455843A
Cited
US3755534A
Cited
US3787333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |