US4438215A
Expired / Lapsed
US
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Activity enhancement of high silica zeolites
Assignee: Mobil Oil AS
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Filing: 1981-11-09
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Granted: 1984-03-20
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Expires: 2001-11-09
Abstract
Abstract A method for enhancing the activity of high silica zeolites, i.e. having a silica-to-alumina ratio greater than 100 which have been synthesized from a reaction mixture containing tetraalkylammonium ions is disclosed which involves calcining the as synthesized zeolites, treatment of the same with aluminum chloride, followed by hydrolysis and calcination in order to obtain materials having an enhanced activity.
Inventors
- 👤 Ralph M. Dessau
- 👤 George T. Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:30
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/50; B01J29/505; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; B01J29/65; B01J29/70; B01J29/80; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/29
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A method for enhancing the acid activity of a high silica crystalline zeolite material having a silica-to-alumina mole ratio greater than 100 wherein said crystalline material has been synthesized from a reaction mixture containing tetraalkylammonium ions which comprises calcining said as synthesized crystalline material at a temperature of from about 200° C. to about 600° C. for a period of time ranging from about 1 to about 48 hours, contacting said calcined crystalline material with aluminum chloride vapor at a temperature of from about 100° C. to about 600° C., hydrolyzing said aluminum chloride contacted crystalline material by contacting the same with water and calcining said hydrolyzed crystalline material in order to obtain a crystalline material having an enhanced acid activity.
Claim 2
Independent Claim
121 words
A method for enhancing the acid activity of a high silica crystalline zeolite material having a silica-to-alumina mole ratio greater than 100 wherein said crystalline material has been synthesized from a reaction mixture containing tetraalkylammonium ions which comprises calcining said as synthesized crystalline material at a temperature of from about 200° C. to about 600° C. for a period of time ranging from about 1 to about 48 hours, contacting said calcined crystalline material with aluminum chloride vapor at a temperature of from about 100° C. to about 600° C., hydrolyzing said aluminum chloride contacted crystalline material by contacting the same with water and calcining said hydrolyzed crystalline material in order to obtain a crystalline material having an enhanced acid activity.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said crystalline material has a silica-to-alumina mole ratio greater than 500.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein said crystalline material has the structure of ZSM-5.
Claim 5
Dependent Claim
14 words
The method of claim 2 wherein said crystalline material has the structure of ZSM-11.
Claim 6
Dependent Claim
18 words
A crystalline zeolite material having enhanced activity prepared by the method of claim 1, 2, 3 or 4.
Claim 7
Dependent Claim
15 words
A catalyst composition comprising a matrix material and a crystalline zeolite material of claim 5.
Claim 8
Independent Claim
81 words
A method for enhancing the acid activity of a high silica crystalline zeolite material having the crystal structure of zeolite ZSM-5 and a silica-to-alumina mole ratio greater than 100 which comprises calcining said crystalline material at a temperature of from about 200° C. to about 600° C., contacting said calcined crystalline material with aluminum chloride vapor at a temperature of from about 100° C. to about 600° C., hydrolyzing said aluminum chloride contacted crystalline material and calcining said hydrolyzed crystalline material.
Claim 9
Independent Claim
81 words
A method for enhancing the acid activity of a high silica crystalline zeolite material having the crystal structure of zeolite ZSM-5 and a silica-to-alumina mole ratio greater than 100 which comprises calcining said crystalline material at a temperature of from about 200° C. to about 600° C., contacting said calcined crystalline material with aluminum chloride vapor at a temperature of from about 100° C. to about 600° C., hydrolyzing said aluminum chloride contacted crystalline material and calcining said hydrolyzed crystalline material.
Claim 10
Independent Claim
81 words
A method for enhancing the acid activity of a high silica crystalline zeolite material having the crystal structure of zeolite ZSM-11 and a silica-to-alumina mole ratio greater than 100 which comprises calcining said crystalline material at a temperature of from about 200° C. to about 600° C., contacting said calcined crystalline material with aluminum chloride vapor at a temperature of from about 100° C. to about 600° C., hydrolyzing said aluminum chloride contacted crystalline material and calcining said hydrolyzed crystalline material.
Claim 11
Independent Claim
81 words
A method for enhancing the acid activity of a high silica crystalline zeolite material having the crystal structure of zeolite ZSM-11 and a silica-to-alumina mole ratio greater than 100 which comprises calcining said crystalline material at a temperature of from about 200° C. to about 600° C., contacting said calcined crystalline material with aluminum chloride vapor at a temperature of from about 100° C. to about 600° C., hydrolyzing said aluminum chloride contacted crystalline material and calcining said hydrolyzed crystalline material.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |