US3908047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating an alumina base
Assignee: Gulf Research and Development Co
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Filing: 1973-12-05
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Granted: 1975-09-23
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Expires: 1993-12-05
Abstract
Abstract A process for coating an alumina having a high surface area disposed as a coating on a monolith having a low surface area which involves impregnating a first portion of the alumina coating with a paraffin wax, impregnating a second portion of the alumina coating with an aqueous or alcoholic solution of a first noble metal salt, subsequently calcining the treated monolith to remove the paraffin wax on the first portion of the alumina coating and to deposit a first noble metal on the second portion of the alumina coating, impregnating the second portion of the alumina coating carrying the first noble metal with a paraffin wax, impregnating the first portion of the alumina coating with an aqueous or alcoholic solution of a second metal salt and subsequently calcining the impregnated monolith to remove the paraffin wax on the second portion of the alumina coating and to deposit the second noble metal on the first portion of the alumina coating.
Inventors
- 👤 Harold Beuther
- 👤 Thaddeus P Kobylinski
- 👤 Roger F Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:17
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9459; B01J; B01J23/00; B01J23/38; B01J23/40; B01J37/00; B01J37/02; B01J37/024; B01J37/0242; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1023; B01D2255/1026; B01D2255/90; B01D2255/92; B01D2255/9207; B01D53/9404; B01D53/9409; B01D53/944
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
353 words
PROCESS FOR COATING AN ALUMINA HAVING A SURFACE AREA OF ABOUT 1.0 TO ABOUT 500 SQUARE METERS PER GRAM, A LAYER THICKNESS OF ABOUT 1.0 TO ABOUT 1600 MICRONS AND A PORE DIAMETER OF ABOUT 10 TO ABOUT 300 A DISPOSED AS A COATING ON A HIGHLY IMPERVIOUS AND SUBSTANTIALLY INERT MONOLITH HAVING A LOW SURFACE AREA WHICH COMPRISES IMPREGNATING A FIRST PORTION OF SAID ALUMINA COATING WITH A PARAFFIN WAX BY IMMERSING SAID MONOLITH IN A MOLTEN PARAFIN WAX BATH HAVING A TEMPERATURE OF ABOUT 40* TO ABOUT 150*C FOR ABOUT 1 TO ABOUT 60 MINUTES, COOLING THE IMPREGNATED MONOLITH TO SOLIDIFY THE PARAFFIN WAX, IMPREGNATING A SECOND PORTION OF SAID ALUMINA COATING BY IMMERSION IN AN AQUEOUS OR ALKANOIC SOLUTION OF A FIRST NOBLE METAL SALT MAINTAINED AT A TEMPERATURE OF ABOUT 10* TO ABOUT 45*C FOR ABOUT 1 TO ABOUT 60 MINUTES, WHEREIN THE ALKANOL HAS FROM ONE TO FIVE CARBON ATOMS, SUBSEQUENTLY CALCINING THE TREATED NONOLITH IN AIR AT TEMPERATURE OF ABOUT 400* TO ABOUT 800*C FOR ABOUT 1 TO ABOUT 20 HOURS TO REMOVE THE PARAFFIN WAX ON SAID FIRST PORTION OF THE ALUMINA COATING AND TO DEPOSIT THEREON A FIRST NOBLE METAL ON SAID SECOND PORTION OF SAID ALUMINA COATING, IMPREGNATING SAID SECOND PORTION OF SAID ALUMINA COATING WITH PARAFIN WAX BY IMMERSING SAID MONOLITH IN A MOLTEN PARAFIN WAX BATH HAVING A TEMPERATURE OF ABOUT 40* TO ABOUT 150*C FOR ABOUT ONE TO ABOUT 60 MINUTES, COOLING THE IMPREGENATED MONOLITH TO SOLIDIFY THE PARAFFIN WAX IMPREGNATING SAID FIRST PORTION OF SAID ALUMINA COATING BY IMMERSION IN AN AQUEOUS OR ALKANOIC SOLUTION OF A SECOND METAL SALT MAINTAINED AT A TEMPERATURE OF ABOUT 10* TO ABOUT 45*C FOR ABOUT 1 TO ABOUT 60 MINUTES, WHEREIN IN THE ALKANOL HAS FROM ONE TO FIVE CARBON ATOMS AND SUBSEQUENTLY CALCINING THE IMPREGNATED MONOLITH IN AIR AT A TEMPERATURE OF ABOUT 400* TO ABOUT 800*C FOR ABOUT ONE TO ABOUT 20 HOURS TO REMOVE THE PARAFFIN WAX ON SAID SECOND PORTION OF SAID ALUMINA COATING AND TO DEPOSIT A SECOND NOBLE METAL ON SAID FIRST PORTION OF SAID ALUMINA COATING
Claim 2
Dependent Claim
353 words
PROCESS FOR COATING AN ALUMINA HAVING A SURFACE AREA OF ABOUT 1.0 TO ABOUT 500 SQUARE METERS PER GRAM, A LAYER THICKNESS OF ABOUT 1.0 TO ABOUT 1600 MICRONS AND A PORE DIAMETER OF ABOUT 10 TO ABOUT 300 A DISPOSED AS A COATING ON A HIGHLY IMPERVIOUS AND SUBSTANTIALLY INERT MONOLITH HAVING A LOW SURFACE AREA WHICH COMPRISES IMPREGNATING A FIRST PORTION OF SAID ALUMINA COATING WITH A PARAFFIN WAX BY IMMERSING SAID MONOLITH IN A MOLTEN PARAFIN WAX BATH HAVING A TEMPERATURE OF ABOUT 40* TO ABOUT 150*C FOR ABOUT 1 TO ABOUT 60 MINUTES, COOLING THE IMPREGNATED MONOLITH TO SOLIDIFY THE PARAFFIN WAX, IMPREGNATING A SECOND PORTION OF SAID ALUMINA COATING BY IMMERSION IN AN AQUEOUS OR ALKANOIC SOLUTION OF A FIRST NOBLE METAL SALT MAINTAINED AT A TEMPERATURE OF ABOUT 10* TO ABOUT 45*C FOR ABOUT 1 TO ABOUT 60 MINUTES, WHEREIN THE ALKANOL HAS FROM ONE TO FIVE CARBON ATOMS, SUBSEQUENTLY CALCINING THE TREATED NONOLITH IN AIR AT TEMPERATURE OF ABOUT 400* TO ABOUT 800*C FOR ABOUT 1 TO ABOUT 20 HOURS TO REMOVE THE PARAFFIN WAX ON SAID FIRST PORTION OF THE ALUMINA COATING AND TO DEPOSIT THEREON A FIRST NOBLE METAL ON SAID SECOND PORTION OF SAID ALUMINA COATING, IMPREGNATING SAID SECOND PORTION OF SAID ALUMINA COATING WITH PARAFIN WAX BY IMMERSING SAID MONOLITH IN A MOLTEN PARAFIN WAX BATH HAVING A TEMPERATURE OF ABOUT 40* TO ABOUT 150*C FOR ABOUT ONE TO ABOUT 60 MINUTES, COOLING THE IMPREGENATED MONOLITH TO SOLIDIFY THE PARAFFIN WAX IMPREGNATING SAID FIRST PORTION OF SAID ALUMINA COATING BY IMMERSION IN AN AQUEOUS OR ALKANOIC SOLUTION OF A SECOND METAL SALT MAINTAINED AT A TEMPERATURE OF ABOUT 10* TO ABOUT 45*C FOR ABOUT 1 TO ABOUT 60 MINUTES, WHEREIN IN THE ALKANOL HAS FROM ONE TO FIVE CARBON ATOMS AND SUBSEQUENTLY CALCINING THE IMPREGNATED MONOLITH IN AIR AT A TEMPERATURE OF ABOUT 400* TO ABOUT 800*C FOR ABOUT ONE TO ABOUT 20 HOURS TO REMOVE THE PARAFFIN WAX ON SAID SECOND PORTION OF SAID ALUMINA COATING AND TO DEPOSIT A SECOND NOBLE METAL ON SAID FIRST PORTION OF SAID ALUMINA COATING
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said first metal is ruthenium and said second metal is platinum.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said first metal is ruthenium and said second metal is palladium.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said first metal is ruthenium and said second solution contains a mixture of a platinum and a palladium salt.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said noble metal solutions are aqueous.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said noble metal solutions are alcoholic.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein said alumina coating has a thickness of about two to about 900 microns.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein said alumina has a surface area of about 10 to about 200m2 per gram.
References Cited (Backward Citations)
US2897097A
Cited
US3647730A
Cited
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 |