US4427788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activation of zeolites
Assignee: Mobil Oil AS
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Filing: 1982-03-08
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Granted: 1984-01-24
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Expires: 2002-03-08
Abstract
Abstract A method for enhancing the activity of a crystalline zeolite, including a zeolite having a silica-to-alumina ratio greater than 100, is disclosed which involves impregnating the zeolite with an ammoniacal aluminum fluoride solution, contacting the impregnated zeolite with a warm aqeuous solution of an ammonium salt and then calcining the final product.
Inventors
- 👤 Joseph N. Miale
- 👤 Clarence D. Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:12
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/30; B01J2229/40; B01J29/65; B01J29/70; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/29
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio of 70 or more which comprises impregnating the zeolite at a temperature of from about 0° C. to about 100° C. with an ammoniacal aluminum fluoride solution comprising from about 0.1 to about 5 weight percent of an aluminum fluoride in solution with at least one member selected from the group consisting of ammonium hydroxide and ammonia, contacting the impregnated zeolite with a warm aqueous 0.1 to 2 Normal solution of an ammonium salt, and calcining the ammonium salt solution contacted material at a temperature of from about 200° C. to about 600° C.
Claim 2
Independent Claim
110 words
A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio of 70 or more which comprises impregnating the zeolite at a temperature of from about 0° C. to about 100° C. with an ammoniacal aluminum fluoride solution comprising from about 0.1 to about 5 weight percent of an aluminum fluoride in solution with at least one member selected from the group consisting of ammonium hydroxide and ammonia, contacting the impregnated zeolite with a warm aqueous 0.1 to 2 Normal solution of an ammonium salt, and calcining the ammonium salt solution contacted material at a temperature of from about 200° C. to about 600° C.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said zeolite has a silica-to-alumina mole ratio greater than about 100.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said zeolite has a silica-to-alumina mole ratio greater than about 500.
Claim 5
Dependent Claim
42 words
The method of claim 1 wherein said aluminum fluoride is at least one member selected from the group consisting of AlF 3 , (NH 4 ) 3 AlF 6 , (NH 4 ) 2 AlF 5 and NH 4 AlF 4 .
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said ammonium salt solution is ammonium nitrate, ammonium sulfate or ammonium chloride.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein said zeolite is ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48.
Claim 8
Dependent Claim
12 words
The method of claim 2 wherein said zeolite is ZSM-5 or ZSM-11.
Claim 9
Dependent Claim
20 words
A zeolite composition having enhanced activity prepared by the method of claim 1, 2, 3, 4, 5, 6 or 7.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |