US4427789A
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 compositing and extruding the zeolite with an alumina support matrix, vacuum impregnating the extrudate with an aqueous solution of an alkali metal fluoride, contacting the impregnated extrudate with a warm aqueous 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
2026-11-08 20:29
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; B01J29/65; B01J29/70; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/23; Y10S423/29; Y10S423/33; Y10S423/36
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
81 words
A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio greater than about 100 which comprises the steps of (1) compositing same with alumina, (2) impregnating the composite under a vacuum with an aqueous solution of an alkali metal fluoride, (3) contacting the impregnated composite with a warm aqueous solution of an ammonium salt, and (4) calcining the ammonium salt solution contacted material at a temperature of from about 200° C. to about 600° C.
Claim 2
Independent Claim
81 words
A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio greater than about 100 which comprises the steps of (1) compositing same with alumina, (2) impregnating the composite under a vacuum with an aqueous solution of an alkali metal fluoride, (3) contacting the impregnated composite with a warm aqueous solution of an ammonium salt, and (4) 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 500.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said ammonium salt solution is ammonium nitrate.
Claim 5
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 6
Dependent Claim
12 words
The method of claim 4 wherein said zeolite is ZSM-5 or ZSM-11.
Claim 7
Dependent Claim
18 words
A zeolite composition having enhanced activity prepared by the method of claim 1, 2, 3, 4 or 5.
Claim 8
Independent Claim
106 words
A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio greater than about 100 which comprises the steps of (1) compositing same with alumina so that the composite comprises from about 25 weight percent to about 75 weight percent zeolite, (2) extruding the composite to form an extrudate thereof, (3) impregnating the extrudate under a vacuum with an aqueous solution of an alkali metal fluoride, (4) contacting the impregnated extrudate with a warm aqueous solution of an ammonium salt, and (5) calcining the ammonium salt solution contacted material at a temperature of from about 200° C. to about 600° C.
Claim 9
Independent Claim
106 words
A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio greater than about 100 which comprises the steps of (1) compositing same with alumina so that the composite comprises from about 25 weight percent to about 75 weight percent zeolite, (2) extruding the composite to form an extrudate thereof, (3) impregnating the extrudate under a vacuum with an aqueous solution of an alkali metal fluoride, (4) contacting the impregnated extrudate with a warm aqueous solution of an ammonium salt, and (5) calcining the ammonium salt solution contacted material at a temperature of from about 200° C. to about 600° C.
Claim 10
Dependent Claim
28 words
The method of claim 1 wherein said alkali metal fluoride is selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride and cesium fluoride.
Claim 11
Dependent Claim
28 words
The method of claim 7 wherein said alkali metal fluoride is selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride and cesium fluoride.
Claim 12
Dependent Claim
17 words
The method of claim 7 wherein said zeolite has a silica-to-alumina mole ratio greater than about 500.
Claim 13
Dependent Claim
13 words
The method of claim 7 wherein said ammonium salt solution is ammonium nitrate.
Claim 14
Dependent Claim
17 words
The method of claim 7 wherein said zeoite is ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48.
Claim 15
Dependent Claim
12 words
The method of claim 12 wherein said zeolite is ZSM-5 or ZSM-11.
Claim 16
Dependent Claim
13 words
A zeolite composition having enhanced activity prepared by the method of claim 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 |