US4297335A
Expired / Lapsed
US
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Aluminum deficient zeolite compositions and process for preparing same
Assignee: Katalistiks International Inc
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Filing: 1980-03-25
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Granted: 1981-10-27
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Expires: 2000-03-25
Abstract
Abstract The hydrophobicity of crystalline zeolites is enhanced and their catalytic activity altered by treatment with fluorine under controlled conditions which result in dealumination and structural stabilization as evidenced by changes observed in their infrared framework spectra.
Inventors
- 👤 Brent M. T. Lok
- 👤 Thomas J. P. Izod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:54
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; Y; Y10; Y10S; Y10S423/00; Y10S423/21; Y10S423/22; Y10S423/23; Y10S423/26; Y10S423/27; Y10S423/28; Y10S423/29; Y10S423/33
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
Process for enhancing the hydrophobicity of crystalline zeolites which comprises; (a) providing an activated crystalline zeolitic aluminosilicate having a SiO 2 /Al 2 O 3 molar ratio of at least 2, and having at least 60 percent, of the framework aluminum atoms not associated with metal cations; (b) contacting said activated aluminosilicate with a gas mixture comprising (i) from 0.1 to 20 volume percent fluorine (ii) from zero to 21 volume percent oxygen (iii) and as the remainder, one or a mixture of two or more inert gases, said contact being at a temperature of from about 50° F. to 400° F. for a period of at least 1 minute.
Claim 2
Dependent Claim
110 words
Process for enhancing the hydrophobicity of crystalline zeolites which comprises; (a) providing an activated crystalline zeolitic aluminosilicate having a SiO 2 /Al 2 O 3 molar ratio of at least 2, and having at least 60 percent, of the framework aluminum atoms not associated with metal cations; (b) contacting said activated aluminosilicate with a gas mixture comprising (i) from 0.1 to 20 volume percent fluorine (ii) from zero to 21 volume percent oxygen (iii) and as the remainder, one or a mixture of two or more inert gases, said contact being at a temperature of from about 50° F. to 400° F. for a period of at least 1 minute.
Claim 3
Dependent Claim
26 words
Process according to claim 1 wherein the starting activated crystalline aluminosilicate has a SiO 2 /Al 2 O 3 molar ratio of from 4 to 190.
Claim 4
Dependent Claim
26 words
Process according to claim 2 wherein at least about 90 percent of the framework aluminum atoms of the starting zeolite are not associated with metal cations.
Claim 5
Dependent Claim
16 words
Process according to claim 3 wherein the crystalline zeolitic aluminosilicate has the zeolite Y crystal structure.
Claim 6
Dependent Claim
15 words
Process according to claim 3 wherein the crystalline zeolitic aluminosilicate has the mordenite crystal structure.
Claim 7
Dependent Claim
16 words
Process according to claim 3 wherein the crystalline zeolitic aluminosilicate has the zeolite ZSM-5 crystal structure.
Claim 8
Dependent Claim
16 words
Process according to claim 3 wherein the crystalline zeolitic aluminosilicate has the zeolite omega crystal structure.
Claim 9
Dependent Claim
31 words
Process according to claim 1 which includes the further step of calcining the fluorine-treated zeolite at a temperature of from 500° C. up to the crystal destruction temperature of the zeolite.
Claim 10
Dependent Claim
17 words
Process according to claim 8 which includes the further step of rehydrating the fluorine-treated and calcined zeolite.
Claim 11
Dependent Claim
15 words
Process according to claim 1 which includes the further step of rehydrating the fluorine-treated zeolite.
References Cited (Backward Citations)
US3477965A
Cited
US3594331A
Cited
US3839539A
Cited
US3699056A
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US3630965A
Cited
US3702312A
Cited
US3933983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |