Patent JPS60113673A successfully refreshed from Google Patents.
US4522929A
Expired / Lapsed
US
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Active zeolite catalysts of improved stability
Assignee: Mobil Oil AS
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Filing: 1983-10-06
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Granted: 1985-06-11
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Expires: 2003-10-06
Abstract
Abstract A zeolite of improved stability for use in acid-catalyzed reactions is prepared by mildly presteaming the catalyst under controlled conditions of temperature, time, and steam partial pressure. The resulting catalyst retains nearly the same activity as that of a fresh unsteamed catalyst.
Inventors
- 👤 Arthur W. Chester
- 👤 Yung F. Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:21
CPC Classifications
C; C07; C07C; C07C2/00; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J37/00; B01J37/08; B01J37/10; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708; B01J2229/00; B01J2229/30; B01J2229/36; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
115 words
A method of producing a zeolite catalyst of improved stability wherein said zeolite catalyst comprises a zeolite having a silica/alumina ratio greater than 12 and a constraint index of 1 to 12, comprising steaming said zeolite catalyst in its fresh state under controlled conditions of temperature, time and steam partial pressure so as to initially increase the α-activity of said catalyst and produce a steamed catalyst having a peak α-activity, and subsequently reduce the α-activity from said peak α-activity to an α-activity substantially the same as the α-activity of said fresh catalyst and no more than 25% below the initial α-activity of said fresh catalyst, said steamed catalyst having enhanced stability over said fresh catalyst.
Claim 2
Independent Claim
115 words
A method of producing a zeolite catalyst of improved stability wherein said zeolite catalyst comprises a zeolite having a silica/alumina ratio greater than 12 and a constraint index of 1 to 12, comprising steaming said zeolite catalyst in its fresh state under controlled conditions of temperature, time and steam partial pressure so as to initially increase the α-activity of said catalyst and produce a steamed catalyst having a peak α-activity, and subsequently reduce the α-activity from said peak α-activity to an α-activity substantially the same as the α-activity of said fresh catalyst and no more than 25% below the initial α-activity of said fresh catalyst, said steamed catalyst having enhanced stability over said fresh catalyst.
Claim 3
Dependent Claim
11 words
A method according to claim 1 wherein said zeolite is ZSM-5.
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein said catalyst further comprises metal promoters.
Claim 5
Dependent Claim
21 words
A method according to claim 3 wherein said catalyst has said metal promoters included on it prior to the steaming procedure.
Claim 6
Dependent Claim
20 words
A method according to claim 3 wherein said catalyst has said metal promoters included on it after the steaming procedure.
Claim 7
Dependent Claim
15 words
A method according to claim 1 wherein said silica/alumina ratio is no less than 20.
Claim 8
Dependent Claim
13 words
A method according to claim 6 wherein said silica/alumina ratio is about 40.
Claim 9
Dependent Claim
13 words
A method according to claim 6 wherein said silica/alumina ratio is about 70.
Claim 10
Dependent Claim
9 words
The product produced by the method of claim 1.
Claim 11
Dependent Claim
9 words
The product produced by the method of claim 2.
Claim 12
Dependent Claim
9 words
The product produced by the method of claim 3.
Claim 13
Dependent Claim
9 words
The product produced by the method of claim 4.
Claim 14
Dependent Claim
9 words
The product produced by the method of claim 5.
Claim 15
Dependent Claim
9 words
The product produced by the method of claim 6.
Claim 16
Dependent Claim
9 words
The product produced by the method of claim 7.
Claim 17
Dependent Claim
9 words
The product produced by the method of claim 8.
References Cited (Backward Citations)
US4247388A
Cited
US4326994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |