US3720753A
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Method for preparing a small pore synthetic zeolite
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-02-22
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Granted: 1973-03-13
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Expires: 1991-02-22
Abstract
Abstract A synthetic small pore crystalline zeolite having a structure and X-ray diffraction pattern similar to that of synthetic zeolite ZK-5 is prepared by digesting an aqueous reactant mixture containing silica, alumina, and either a mixture of potassium oxide and cesium oxide, or potassium oxide, cesium oxide and sodium oxide at a temperature of from 60* to 120*C. The zeolite product contains cesium cations as well as potassium cations in its as-synthesized form. A substantial portion of the cations is in an inaccessable position in the crystal lattice so that it is essentially unexchangable. The zeolite product is used as a selective adsorbent or as a catalyst after suitable modification by base exchange and deposition of a catalytically active metal.
Inventors
- 👤 H Robson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:27
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2869; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; C01B33/2892
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
A method for preparing an essentially pure crystalline aluminosilicate zeolite containing cesium in inaccessible ion exchange positions, said zeolite having a composition, expressed in terms of mole ratios of oxides, as follows: 0.1-0.4 Cs2O:0.6-0.9 M2O:Al2O3: YSiO2:ZH2O wherein M is potassium and sodium, such that the ratio of sodium over potassium is up to about 1, Y is from 4 to about 7, and Z is from 0 up to about 10, which comprises crystallizing said zeolite from an aqueous reaction mixture containing alkali metal oxide, silica and alumina, the molar ratios of said constituents in the reaction mixture are with the following ranges: SiO2/Al2O3 5-10 K2O+Cs2O/SiO2 0.25-0.32 Cs2O/K2O+Cs2O 0.10-0.30 Na2O/K2O+Cs2O 0-0.4 H2O/SiO2 7-10 heating said mixture to a temperature of from about 60* to 120*C., maintaining said mixture at said temperature for a sufficient period of time to form a crystallized product essentially uncontaminated by extraneous crystalline or amorphous phases, said zeolite product having the x-ray diffraction pattern values shown for K-Cs zeolite in Table A.
Claim 2
Independent Claim
166 words
A method for preparing an essentially pure crystalline aluminosilicate zeolite containing cesium in inaccessible ion exchange positions, said zeolite having a composition, expressed in terms of mole ratios of oxides, as follows: 0.1-0.4 Cs2O:0.6-0.9 M2O:Al2O3: YSiO2:ZH2O wherein M is potassium and sodium, such that the ratio of sodium over potassium is up to about 1, Y is from 4 to about 7, and Z is from 0 up to about 10, which comprises crystallizing said zeolite from an aqueous reaction mixture containing alkali metal oxide, silica and alumina, the molar ratios of said constituents in the reaction mixture are with the following ranges: SiO2/Al2O3 5-10 K2O+Cs2O/SiO2 0.25-0.32 Cs2O/K2O+Cs2O 0.10-0.30 Na2O/K2O+Cs2O 0-0.4 H2O/SiO2 7-10 heating said mixture to a temperature of from about 60* to 120*C., maintaining said mixture at said temperature for a sufficient period of time to form a crystallized product essentially uncontaminated by extraneous crystalline or amorphous phases, said zeolite product having the x-ray diffraction pattern values shown for K-Cs zeolite in Table A.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein said molar ratios in the reaction mixture are within the following ranges: SiO2/Al2O3 7-9 K2O+Cs2O/SiO2 about 0.3 Cs2O/K2O+Cs2O 0.15-0.25 Na2O/K2O+Cs2O 0-0.2 H2O/SiO2 8-9
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |