US4235756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified gamma alumina composition
Assignee: Shell USA Inc
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Filing: 1979-07-27
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Granted: 1980-11-25
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Expires: 1999-07-27
Abstract
Abstract A novel aluminous composition prepared by impregnating porous gamma alumina with aluminum hydride and subsequently heating the impregnated alumina to a temperature of from about 300° C. to about 900° C. in a non-oxidizing environment. The composition is useful as a catalyst in reactions catalyzed by acid catalysts.
Inventors
- 👤 Lynn H. Slaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:15
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; C; C07; C07C; C07C2/00; C07C2521/00; C07C2521/02; C07C2521/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
A process for preparing an aluminous composition which comprises impregnating a substantially dehydrated gamma alumina with aluminum hydride dissolved in an anhydrous, non-hydroxyl containing organic solvent, drying the impregnated alumina to remove the solvent and subsequently heating the impregnated alumina at a temperature of about 300° to about 900° C. in a nonoxidizing atmosphere.
Claim 2
Dependent Claim
54 words
A process for preparing an aluminous composition which comprises impregnating a substantially dehydrated gamma alumina with aluminum hydride dissolved in an anhydrous, non-hydroxyl containing organic solvent, drying the impregnated alumina to remove the solvent and subsequently heating the impregnated alumina at a temperature of about 300° to about 900° C. in a nonoxidizing atmosphere.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the impregnated alumina is subsequently heated to a temperature of about 450° C. to about 750° C.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein the impregnated alumina before heating contains from about 0.01 to about 35 percent by weight of aluminum hydride measured as aluminum metal.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein the impregnated alumina before heating contains about 0.1 to about 25 percent by weight of alumina hydride measured as aluminum metal.
Claim 6
Dependent Claim
27 words
The process of claim 1 wherein the impregnated alumina before heating contains of 1 to about 10 percent by weight of aluminum hydride measured as aluminum metal.
Claim 7
Dependent Claim
25 words
The process of claim 5 wherein the aluminum hydride is AlH 3 .1/3(CH 3 CH 2 ) 2 O dissolved in tetrahydrofuran or diethyl ether.
Claim 8
Dependent Claim
28 words
The process of claim 2 wherein the impregnated alumina before heating contains from about 0.01 to about 35 percent by weight of aluminum hydride measured as the metal.
Claim 9
Dependent Claim
28 words
The process of claim 2 wherein the impregnated alumina before heating contains from about 0.1 to about 25 percent by weight of aluminum hydride measured as the metal.
Claim 10
Dependent Claim
28 words
The process of claim 2 wherein the impregnated alumina before heating contains from about 1 to about 10 percent by weight of aluminum hydride measured as the metal.
Claim 11
Dependent Claim
25 words
The process of claim 9 wherein the aluminum hydride is AlH 3 .1/2(CH 3 CH 2 ) 2 O dissolved in tetrahydrofuran or diethyl ether.
Claim 12
Dependent Claim
10 words
A composition as prepared by the process of claim 1.
Claim 13
Dependent Claim
19 words
A composition as prepared by the process of claims 2, 3, 4, 5, 6, 7, 8, 9 or 10.
References Cited (Backward Citations)
US3146209A
Cited
US3501333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |