US4458025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of zeolitic catalyst manufacture
Assignee: Chevron USA Inc
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Filing: 1982-09-20
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Granted: 1984-07-03
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Expires: 2002-09-20
Abstract
Abstract A method of making a new catalyst is disclosed which is useful for dehydrocyclizing alkanes. In this method, a non-acidic alumina sol is mulled with a zeolite to form a mixture, then the mixture is extruded and the resulting extrudate is dried, calcined, impregnated with a Group VIII metal, then dried and calcined again.
Inventors
- 👤 Bowman Lee
- 👤 Donald S. Santilli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; C; C07; C07C; C07C5/00; C07C5/32; C07C5/373; C07C5/393; C07C5/41; C07C5/415; C07C5/417; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A method of forming a catalyst comprising: (a) forming a non-acidic alumina sol; (b) mulling said alumina sol with a zeolite to form a mixture; (c) extruding said mixture to form an extrudate; (d) drying said extrudate; (e) calcining said dried extrudate; (f) impregnating said calcined extrudate with a Group VIII metal to form a catalyst; (g) drying said catalyst; and (h) calcining said dried catalyst.
Claim 2
Independent Claim
66 words
A method of forming a catalyst comprising: (a) forming a non-acidic alumina sol; (b) mulling said alumina sol with a zeolite to form a mixture; (c) extruding said mixture to form an extrudate; (d) drying said extrudate; (e) calcining said dried extrudate; (f) impregnating said calcined extrudate with a Group VIII metal to form a catalyst; (g) drying said catalyst; and (h) calcining said dried catalyst.
Claim 3
Dependent Claim
30 words
A method of forming a catalyst according to claim 1 wherein said non-acidic alumina sol is formed by peptizing an alumina, back-neutralizing said peptized alumina sol and washing said sol.
Claim 4
Dependent Claim
19 words
A method of forming a catalyst according to claim 2 wherein said alumina sol is an alpha-alumina monohydrate sol.
Claim 5
Dependent Claim
18 words
A method of forming a catalyst according to claim 2 wherein said alumina is peptized with nitric acid.
Claim 6
Dependent Claim
19 words
A method of forming a catalyst according to claim 2 wherein said alumina sol is back-neutralized with potassium hydroxide.
Claim 7
Dependent Claim
22 words
A method of forming a catalyst according to claim 1 wherein said non-acidic sol is formed by peptizing alumina with potassium hydroxide.
Claim 8
Dependent Claim
18 words
A method of forming a catalyst according to claim 1 wherein said zeolite is a potassium-type L zeolite.
Claim 9
Dependent Claim
31 words
A method of forming a catalyst according to claim 1 wherein said calcining in step (e) is conducted at a temperature of about 1000° F. for from 1 to 2 hours.
Claim 10
Dependent Claim
17 words
A method of forming a catalyst according to claim 1 wherein said Group VIII metal is platinum.
Claim 11
Dependent Claim
34 words
A method of forming a catalyst according to claim 1 wherein said impregnation of said calcined extrudate is conducted with a 1% molar solution of Pt(NH 3 ) 4 (NO 3 ) 2 .
Claim 12
Dependent Claim
26 words
A method of forming a catalyst according to claim 1 wherein said calcining in step (h) is conducted at about 500° F. for about 2 hours.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |