US4559314A
Expired / Lapsed
US
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Zeolite activation
Assignee: Mobil Oil AS
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Filing: 1984-01-23
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Granted: 1985-12-17
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Expires: 2004-01-23
Abstract
Abstract The activity of a zeolite catalyst is enhanced by forming the catalyst into a composite with a binder such as alumina and steaming the composite. The zeolites have a Constraint Index of 1 to 12 and a silica:alumina ratio of at least 12 and ZSM-5 is preferred. The enhancement of the activity is greatest at the high silica:alumina ratio, especially at ratios above 1200.
Inventors
- 👤 David S. Shihabi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:35
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; B01J29/65; B01J29/70
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
54 words
A method of producing an improved catalyst, which method comprises forming a composite of a crystalline aluminosilicate zeolite having a silica:alumina ratio of at least 100 and a Constraint Index from 1 to 12, a binder that contains alumina, and water, and contacting the composite with steam to enhance the activity of the catalyst.
Claim 2
Independent Claim
54 words
A method of producing an improved catalyst, which method comprises forming a composite of a crystalline aluminosilicate zeolite having a silica:alumina ratio of at least 100 and a Constraint Index from 1 to 12, a binder that contains alumina, and water, and contacting the composite with steam to enhance the activity of the catalyst.
Claim 3
Dependent Claim
19 words
The method described in claim 1 in which the zeolite has a silica:alumina ratio of at least about 250.
Claim 4
Dependent Claim
18 words
The method described in claim 2 in which the zeolite has a silica:alumina ratio of at least 1200.
Claim 5
Dependent Claim
24 words
The method described in claim 1 in which the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
Claim 6
Dependent Claim
24 words
The method described in claim 2 in which the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
Claim 7
Dependent Claim
24 words
The method described in claim 3 in which the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
Claim 8
Dependent Claim
47 words
The method described in claim 1 in which the zeolite is in the as-synthesized or in the hydrogen form and the composite is formed by mulling the zeolite and the binder together in the presence of water and forming catalyst particles by extruding the mulled wet mixture.
Claim 9
Dependent Claim
26 words
The method described in claim 7 in which the zeolite is ZSM-5 having a silica:alumina ratio of at least about 250 and the binder is alumina.
Claim 10
Dependent Claim
39 words
The method described in claim 8 in which the ZSM-5 is in the hydrogen form during the contact with the steam or a form which is at least partly converted to the hydrogen form by contact with the steam.
Claim 11
Dependent Claim
17 words
A catalyst composition of enhanced activity prepared by the method of any of claims 1 to 9.
Claim 12
Independent Claim
48 words
A method for enhancing catalytic cracking activity of a high-silica ZSM-5 type crystalline zeolite which comprises mixing said zeolite with a binder that contains alumina, and contacting the mixture of zeolite and binder with water at elevated temperature under conditions effective to increase catalytic activity of said mixture.
Claim 13
Independent Claim
48 words
A method for enhancing catalytic cracking activity of a high-silica ZSM-5 type crystalline zeolite which comprises mixing said zeolite with a binder that contains alumina, and contacting the mixture of zeolite and binder with water at elevated temperature under conditions effective to increase catalytic activity of said mixture.
Claim 14
Dependent Claim
70 words
The method of claim 11 comprising the steps of intimately mixing in the presence of water a zeolite having a silica:alumina ratio of at least 100 and a Constraint Index from 1 to 12 with about 10 to 90 weight percent of alumina based on composite mixture and heating the mixture at a temperature of at least about 400° C. for at least one hour in the presence of water.
Claim 15
Dependent Claim
10 words
A catalyst composition made by the process of claim 12.
Claim 16
Dependent Claim
67 words
A zeolite catalyst particle consisting essentially of a mixture of a crystalline zeolite having a silica:alumina ratio of at least 100 and a Constraint Index from 1 to 12 and about 10 to 90 weight percent of alumina based on the mixture, said composite being treated at an elevated temperature in the presence of water under conditions effective to substantially increase the catalytic activity of said mixture.
Claim 17
Dependent Claim
67 words
A zeolite catalyst particle consisting essentially of a mixture of a crystalline zeolite having a silica:alumina ratio of at least 100 and a Constraint Index from 1 to 12 and about 10 to 90 weight percent of alumina based on the mixture, said composite being treated at an elevated temperature in the presence of water under conditions effective to substantially increase the catalytic activity of said mixture.
Claim 18
Dependent Claim
33 words
The catalyst composition of claim 14 wherein the zeolite consists essentially of HZSM-5, the alumina consists essentially of alpha-alumina, and the composite mixture is steam treated at about 300° C. to 450° C.
Claim 19
Independent Claim
93 words
A method for producing additional stable active sites in a crystalline zeolite, which method comprises mixing together in the presence of water ten to ninety parts by weight of a precursor zeolite having a silica to alumina ratio of at least 100 and a Constraint Index of 1 to 12 and ninety to ten parts by weight of a binder that contains alumina, and treating said mixture at elevated temperature, said mixing and treating being conducted under conditions effective to increase the Bronsted acidity, measured as MEQ H/gm zeolite, of said precursor zeolite.
Claim 20
Independent Claim
93 words
A method for producing additional stable active sites in a crystalline zeolite, which method comprises mixing together in the presence of water ten to ninety parts by weight of a precursor zeolite having a silica to alumina ratio of at least 100 and a Constraint Index of 1 to 12 and ninety to ten parts by weight of a binder that contains alumina, and treating said mixture at elevated temperature, said mixing and treating being conducted under conditions effective to increase the Bronsted acidity, measured as MEQ H/gm zeolite, of said precursor zeolite.
Claim 21
Dependent Claim
15 words
The method of claim 16 wherein said Bronsted acidity is increased by at least 10%.
Claim 22
Dependent Claim
23 words
The method of claim 17 wherein said precursor zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
Claim 23
Dependent Claim
9 words
The composition produced by the method of claim 16.
Claim 24
Dependent Claim
9 words
The composition produced by the method of claim 17.
Claim 25
Dependent Claim
9 words
The composition produced by the method of claim 18.
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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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |