US4468475A
Expired / Lapsed
US
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Hydrothermal activation of acid zeolites with alumina
Assignee: Mobil Oil AS
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Filing: 1983-07-11
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Granted: 1984-08-28
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Expires: 2003-07-11
Abstract
Abstract In the process for activating high-silica zeolite catalyst with alumina activating agent wherein a crystalline zeolite catalyst having a silica:alumina ratio greater than 70 and a constraint index of 1 to 12 is contacted with the activating agent at elevated temperature, the improvement which comprises: hydrothermally treating an intimate mixture of zeolite catalyst and an effective amount of activating agent in contact with an aqueous liquid phase under reaction conditions to increase the cracking activity of the catalyst. The activated catalyst product may be produced by hydrothermal treatment of a composite mixture of zeolite and hydrated alumina binder material. The preferred zeolites are acid ZSM-5 type crystalline materials having a silica:alumina ratio of at least 2000:1.
Inventors
- 👤 Guenter H. Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:53
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
48 words
A hydrothermal method for enhancing acid catalytic activity of high-silica crystalline zeolite which comprises mixing said zeolite with an activating amount of alumina; and contacting the mixture of zeolite and alumina with an aqueous liquid medium at elevated temperature under conditions to increase catalytic activity of the zeolite.
Claim 2
Dependent Claim
48 words
A hydrothermal method for enhancing acid catalytic activity of high-silica crystalline zeolite which comprises mixing said zeolite with an activating amount of alumina; and contacting the mixture of zeolite and alumina with an aqueous liquid medium at elevated temperature under conditions to increase catalytic activity of the zeolite.
Claim 3
Dependent Claim
70 words
The method of claim 1 comprising the steps of intimately mixing a zeolite having a silica:alumina molar ratio of at least 70 and a constraint index from 1 to 12 with about 10 to 90 weight percent of alumina based on total weight of solids in the presence of water and heating the composite mixture at a temperature of about 100° C. to 370° C. for at least one hour.
Claim 4
Dependent Claim
36 words
The method of claim 2 comprising the step of forming extrudate catalyst particles from an intimate composite mixture of zeolite and hydrated alumina, drying and calcining the formed catalyst particles prior to hydrothermal treatment with water.
Claim 5
Dependent Claim
16 words
A catalyst composition made by the process of claim 1 and shaping the product into particles.
Claim 6
Dependent Claim
16 words
A catalyst composition made by the process of claim 2 and shaping the product into particles.
Claim 7
Dependent Claim
10 words
A catalyst composition made by the process of claim 3.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein the high-silica crystalline zeolite is ZSM-5 type zeolite.
Claim 9
Dependent Claim
12 words
The method of claim 2 wherein the zeolite is ZSM-5 type zeolite.
Claim 10
Dependent Claim
12 words
The method of claim 3 wherein the zeolite is ZSM-5 type zeolite.
Claim 11
Dependent Claim
63 words
A composite zeolite catalyst prepared by incorporating in a matrix a zeolite having a silica:alumina molar ratio of at least 70 and a constraint index from 1 to 12 and said catalyst having been hydrothermally treated with alumina-containing solid activating agent at an elevated temperature in the presence of an aqueous liquid medium to substantially increase the acid catalytic activity of the catalyst.
Claim 12
Dependent Claim
63 words
A composite zeolite catalyst prepared by incorporating in a matrix a zeolite having a silica:alumina molar ratio of at least 70 and a constraint index from 1 to 12 and said catalyst having been hydrothermally treated with alumina-containing solid activating agent at an elevated temperature in the presence of an aqueous liquid medium to substantially increase the acid catalytic activity of the catalyst.
Claim 13
Dependent Claim
42 words
The composite catalyst of claim 10 wherein the zeolite consists essentially of HZSM-5 having a silica:alumina molar ratio of at least 2000:1, the activating agent consists essentially of hydrated alumina and the mixture is hydrothermally treated at about 100° to 370° C.
Claim 14
Dependent Claim
20 words
The composite catalyst of claim 11 wherein the calcined composite consists essentially of about 25% to 50% by weight alumina.
Claim 15
Dependent Claim
76 words
In the process for activating high-silica HZSM-5 zeolite catalyst with alumina wherein a crystalline zeolite having a silica:alumina ratio greater than 70 and a constraint index of 1 to 12 is contacted with the activating agent at elevated temperature, the improvement which comprises: hydrothermally treating an intimate mixture of zeolite catalyst and an effective activating amount of alumina in contact with an aqueous liquid phase under reaction conditions to increase the cracking activity of the catalyst.
Claim 16
Dependent Claim
76 words
In the process for activating high-silica HZSM-5 zeolite catalyst with alumina wherein a crystalline zeolite having a silica:alumina ratio greater than 70 and a constraint index of 1 to 12 is contacted with the activating agent at elevated temperature, the improvement which comprises: hydrothermally treating an intimate mixture of zeolite catalyst and an effective activating amount of alumina in contact with an aqueous liquid phase under reaction conditions to increase the cracking activity of the catalyst.
Claim 17
Dependent Claim
28 words
The activation process of claim 13 wherein finely divided zeolite is intimately mixed with about 0.1 to 10 parts alumina per part by weight of zeolite (dry basis).
Claim 18
Dependent Claim
19 words
The process of claim 13 wherein the hydrothermal treatment is conducted at about 120° to 200° and autogenous pressure.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |