US4526880A
Expired / Lapsed
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Hydrothermal zeolite activation
Assignee: Mobil Oil AS
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Filing: 1984-07-16
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Granted: 1985-07-02
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Expires: 2004-07-16
Abstract
Abstract The acid activity of a high silica content crystalline zeolite that contains framework boron is increased by hydrolyzing a portion of the boron before compositing the crystals with a binder that contains alumina.
Inventors
- 👤 Pochen Chu
- 👤 Gunter H. Kuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:30
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/86
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
71 words
An improved method for enhancing the catalytic activity of a composition consisting essentially of crystals of a high silica content crystalline zeolite that contains from about 0.1 wt % to about 2.5 wt % of framework boron, said crystals having a silica to alumina ratio of at least 100, which method comprises: treating said crystals with water under conditions effective to hydrolyze from about 10% to about 95% of said boron;
Claim 2
Dependent Claim
71 words
An improved method for enhancing the catalytic activity of a composition consisting essentially of crystals of a high silica content crystalline zeolite that contains from about 0.1 wt % to about 2.5 wt % of framework boron, said crystals having a silica to alumina ratio of at least 100, which method comprises: treating said crystals with water under conditions effective to hydrolyze from about 10% to about 95% of said boron;
Claim 3
Dependent Claim
30 words
compositing under hydrous conditions said treated crystals with fine particles of an alumina-containing material whereby said catalytic activity is increased; and recovering said composited treated crystals of enhanced catalytic activity.
Claim 4
Dependent Claim
30 words
compositing under hydrous conditions said treated crystals with fine particles of an alumina-containing material whereby said catalytic activity is increased; and recovering said composited treated crystals of enhanced catalytic activity.
Claim 5
Dependent Claim
18 words
The method described in claim 1 wherein said high silica content crystalline zeolite is of the ZSM-5 type.
Claim 6
Dependent Claim
78 words
The method described in claim 2 wherein said high silica crystalline zeolite has a silica to alumina ratio greater than about 500 and is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23 , ZSM-35, ZSM-38 and ZSM-48, and said treating step is conducted with liquid water at a temperature of 15° C. to 200° C. for from 0.05 hrs. to 100 hrs. thereby hydrolyzing and removing from said crystals said 10% to 95% of said boron.
Claim 7
Dependent Claim
11 words
The method described in claim 3 wherein said zeolite is ZSM-5.
Claim 8
Dependent Claim
21 words
The method described in claim 1 wherein said crystals are converted to the hydrogen form prior to said treatment with water.
Claim 9
Dependent Claim
21 words
The method described in claim 2 wherein said crystals are converted to the hydrogen form prior to said treatment with water.
Claim 10
Dependent Claim
21 words
The method described in claim 3 wherein said crystals are converted to the hydrogen form prior to said treatment with water.
Claim 11
Dependent Claim
21 words
The method described in claim 4 wherein said crystals are converted to the hydrogen form prior to said treatment with water.
Claim 12
Dependent Claim
18 words
The method described in claim 1 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 13
Dependent Claim
18 words
The method described in claim 2 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 14
Dependent Claim
18 words
The method described in claim 3 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 15
Dependent Claim
18 words
The method described in claim 4 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 16
Dependent Claim
18 words
The method described in claim 5 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 17
Dependent Claim
18 words
The method described in claim 6 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 18
Dependent Claim
18 words
The method described in claim 7 wherein said alumina is an aqueous alumina sol or alpha alumina monohydrate.
Claim 19
Dependent Claim
37 words
The product produced by the method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15.
Claim 20
Dependent Claim
11 words
The method described in claim 1 wherein said zeolite is ZSM-11.
Claim 21
Dependent Claim
9 words
The product produced by the method of claim 17.
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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |