Patent US3840389A successfully refreshed from Google Patents.
US3840389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating refractory oxides
Assignee: Gulf Research and Development Co
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Filing: 1972-07-05
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Granted: 1974-10-08
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Expires: 1992-07-05
Abstract
Abstract A process for coating a refractory oxide which involves impregnating a refractory oxide support with a solution of a salt of ruthenium or rhodium alone or in combination with a salt of at least one of platinum, palladium, osmium or iridium while maintaining a highly acid solution having a pH, for example, of about 0.7 to about 2.2 and then contacting the impregnated refractory oxide with H2S to precipitate the metal sulfide on the refractory support and the product resulting therefrom.
Inventors
- 👤 T Kobylinski
- 👤 B Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:59
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J37/00; B01J37/20; C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5105; C04B41/80; C04B41/81; C04B41/85; C04B41/88
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
130 words
A PROCESS FOR COATING A REFRACTORY OXIDE HAVING A SURFACE AREA OF ABOUT 10M2 TO ABOUT 500M2 PER GRAN WITH AT LEAST ONE METAL SELECTED FROM (1) RUTHENIUM ALONE, (2) RHODIUM ALONE, (3) RUTHENIUM AND RHODIUM ALONE AND (4) RUTHENIUM AND/OR RHODIUM IN COMBINATION WITH AT LEAST ONE OF PLATINUM, PALLADIUM, OSMIUM OR IRIDIUM WHICH COMPRISES IMPREGNATING SAID REFRACTORY OXIDE WITH A SOLUTION CONTAINING A SALT OF AT LEAST ONE OF SAID METALS WHILE MAINTAINING THE PH BETWEEN ABOUT 0.7 TO ABOUT 2.2 TO OBTAIN PENETRATION OF SAID SOLUTION INTO THE BULK OF SAID REFRACTORY OXIDE THEREBY SUBSTANTIALLY FORMING A UNIFORM COATING OF THE OUTER AND THE INTERIOR SURFACES OF SAID REFRACTORY OXIDE, THEREAFTER CONTACTING SAID TREATED REFRACTORY OXIDE WITH H2S AT A TEMPERATURE OF ABOUT 15* TO ABOUT 95*C.
Claim 2
Dependent Claim
130 words
A PROCESS FOR COATING A REFRACTORY OXIDE HAVING A SURFACE AREA OF ABOUT 10M2 TO ABOUT 500M2 PER GRAN WITH AT LEAST ONE METAL SELECTED FROM (1) RUTHENIUM ALONE, (2) RHODIUM ALONE, (3) RUTHENIUM AND RHODIUM ALONE AND (4) RUTHENIUM AND/OR RHODIUM IN COMBINATION WITH AT LEAST ONE OF PLATINUM, PALLADIUM, OSMIUM OR IRIDIUM WHICH COMPRISES IMPREGNATING SAID REFRACTORY OXIDE WITH A SOLUTION CONTAINING A SALT OF AT LEAST ONE OF SAID METALS WHILE MAINTAINING THE PH BETWEEN ABOUT 0.7 TO ABOUT 2.2 TO OBTAIN PENETRATION OF SAID SOLUTION INTO THE BULK OF SAID REFRACTORY OXIDE THEREBY SUBSTANTIALLY FORMING A UNIFORM COATING OF THE OUTER AND THE INTERIOR SURFACES OF SAID REFRACTORY OXIDE, THEREAFTER CONTACTING SAID TREATED REFRACTORY OXIDE WITH H2S AT A TEMPERATURE OF ABOUT 15* TO ABOUT 95*C.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said refractory oxide is carried on a ceramic base.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the pH of said solution is within the range of about 1.0 to about 1.5.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said refractory oxide is an aluminum oxide.
Claim 6
Dependent Claim
21 words
The process of claim 1 Wherein said impregnation is effected within a temperature range of about 15* to about 95* C.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein said impregnation is effected within a temperature range of about 20* to about 60* C.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein said treatment with H2S is within the range of about 20* to about 60* C.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the refractory oxide so prepared is dried at a temperature of about 90* to about 160* C.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein the refractory oxide so prepared is dried at a temperature of about 100* to about 140* C.
Claim 11
Dependent Claim
23 words
The process of claim 1 wherein the refractory oxide so prepared is calcined at a temperature of about 400* to about 600* C.
Claim 12
Dependent Claim
23 words
The process of claim 1 wherein the refractory oxide so prepared is calcined at a temperature of about 450* to about 550* C.
Claim 13
Dependent Claim
10 words
The process of claim 1 wherein said metal is ruthenium.
Claim 14
Dependent Claim
10 words
The process of claim 1 wherein said metal is rhodium.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein said metals are ruthenium and platinum.
Claim 16
Dependent Claim
12 words
The process of claim 1 wherein said metals are ruthenium and palladium.
Claim 17
Dependent Claim
12 words
The process of claim 1 wherein said metals are ruthenium and rhodium.
Claim 18
Dependent Claim
12 words
The process of claim 1 wherein said metals are ruthenium and iridium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |