US4544539A
Expired / Lapsed
US
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Zeolite L with cylindrical morphology
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-05-11
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Granted: 1985-10-01
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Expires: 2003-05-11
Abstract
Abstract A zeolite related to zeolite L and having a characteristic cylindrical morphology may be prepared from a crystallization gel comprising (in mole ratios of oxides): K2O/SiO2: 0.22-0.36 H2O/K2O: 25-90 SiO2/Al2O3: 6-15 and preferably with the mole ratio H2O/K2O+Al2O3+SiO2 being at least 8. The cylindrical Zeolite L may be used as a catalyst base in aromatization of acyclic hydrocarbons with high benzene yields being sustained over commercially feasible periods.
Inventors
- 👤 Theodorus M. Wortel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:48
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/373; C07C5/393; C07C5/41; C07C5/415; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/60; B01J29/61; B01J29/62; C01; C01B; C01B39/00; C01B39/02; C01B39/32; C07C5/22; C07C5/2206; C07C5/226; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/064; C07C2529/068; Y; Y10; Y10S; Y10S423/00; Y10S423/28
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
57 words
A zeolite having an X-ray diffraction pattern obtained from CuK.sub.α radiation with significant d values set out in Table A hereinbefore and comprising highly crystalline crystallites having at 50% of its crystallites in the form of distinct circular cylinders with an aspect ratio of at least 0.5 and with a mean diameter of at least 0.5 micron.
Claim 2
Dependent Claim
57 words
A zeolite having an X-ray diffraction pattern obtained from CuK.sub.α radiation with significant d values set out in Table A hereinbefore and comprising highly crystalline crystallites having at 50% of its crystallites in the form of distinct circular cylinders with an aspect ratio of at least 0.5 and with a mean diameter of at least 0.5 micron.
Claim 3
Dependent Claim
16 words
A zeolite as claimed in claim 1, having at least 70% of its crystallites as cylinders.
Claim 4
Dependent Claim
21 words
A zeolite as claimed in claim 1, wherein the cylindrical crystallites have a mean diameter of from 0.5 to 4 micron.
Claim 5
Dependent Claim
19 words
A zeolite as claimed in claim 3, wherein the aspect ratio of the cylinders is from 0.5 to 1.5.
Claim 6
Dependent Claim
43 words
A material as claimed in claim 1, having a composition expressed in terms of the molar ratio of oxides assuming an anhydrous state of: (0.9-1.3)M.sub.2/n O:Al.sub.2 O.sub.3 :xSiO.sub.2 wherein M is a cation of valence n and x is from 5 to 7.5.
Claim 7
Dependent Claim
14 words
A material as claimed in claim 5, wherein x is from 5.7 to 7.4.
Claim 8
Dependent Claim
14 words
A material as claimed in claim 6, wherein x is from 6 to 6.5.
Claim 9
Dependent Claim
11 words
A material as claimed in claim 5, wherein M is potassium.
Claim 10
Dependent Claim
22 words
A material as claimed in claim 5, wherein the mole ratio M 2/n O:Al 2 O 3 is from 0.95 to 1.15.
Claim 11
Dependent Claim
66 words
A catalyst comprising a zeolite having an X-ray diffraction pattern obtained from CuK.sub.α radiation with the significant d values set out in Table A hereinbefore and comprising highly crystalline crystallites having at least 50% of its crystallites in the form of distinct circular cylinders with a mean diameter of at least 0.5 micron and with an aspect ratio of at least 0.5 and a catalytically-active metal.
Claim 12
Dependent Claim
66 words
A catalyst comprising a zeolite having an X-ray diffraction pattern obtained from CuK.sub.α radiation with the significant d values set out in Table A hereinbefore and comprising highly crystalline crystallites having at least 50% of its crystallites in the form of distinct circular cylinders with a mean diameter of at least 0.5 micron and with an aspect ratio of at least 0.5 and a catalytically-active metal.
Claim 13
Dependent Claim
17 words
A catalyst as claimed in claim 10, in which the catalytically active metal is or includes platinum.
Claim 14
Dependent Claim
13 words
A catalyst as claimed in claim 11, comprising 0.4 to 1.2 wt% platinum.
Claim 15
Dependent Claim
16 words
A catalyst as claimed in claim 11, in which the zeolite is in the potassium form.
Claim 16
Dependent Claim
36 words
A zeolite as claimed in claim 1, in which the zeolite-W content is minimized in that the zeolite has an XRD pattern in which the peak height ratio (d=7.09 Å)/(d=3.91 Å) is not greater than 0.2.
Claim 17
Dependent Claim
18 words
A zeolite as claimed in claim 14, in which the zeolite is substantially free of additional crystalline material.
Claim 18
Dependent Claim
14 words
A zeolite as claimed in claim 3, wherein the cylinders are right circular cylinders.
Claim 19
Dependent Claim
20 words
A catalyst as claimed in claim 10, comprising the zeolite in which at least 70% of its crystallites are cylinders.
Claim 20
Dependent Claim
24 words
A catalyst as claimed in claim 17, comprising the zeolite wherein the cylindrical crystallites have a mean diameter of from 0.5 to 4 micron.
Claim 21
Dependent Claim
22 words
A catalyst as claimed in claim 18, comprising the zeolite wherein the aspect ratio of the cylinders is from 0.5 to 1.5.
Claim 22
Dependent Claim
44 words
A catalyst as claimed in claim 10, comprising the zeolite composition expressed in terms of the molar ratio of oxides assuming an anhydrous state of: (0.91-1.3)M.sub.2/n O:Al.sub.2 O.sub.3 :xSiO.sub.2 wherein M is a cation of valence n and x is from 5 to 7.5.
Claim 23
Dependent Claim
18 words
A catalyst as claimed in claim 20, comprising the zeolite composition wherein x is from 5.7 to 7.4.
Claim 24
Dependent Claim
18 words
A catalyst as claimed in claim 21, comprising the zeolite composition wherein x is from 6 to 6.5.
Claim 25
Dependent Claim
15 words
A catalyst as claimed in claim 20, comprising the zeolite composition wherein M is potassium.
Claim 26
Dependent Claim
26 words
A catalyst as claimed in claim 20, comprising the zeolite composition wherein the mole ratio M 2/n O:Al 2 O 3 is from 0.95 to 1.15.
Claim 27
Dependent Claim
39 words
A catalyst as claimed in claim 10, comprising the zeolite in which the zeolite-W content is minimized in that the zeolite has an XRD pattern in which the peak height ratio (d=7.09 Å)/(d=3.91 Å) is not greater than 0.2.
Claim 28
Dependent Claim
18 words
A catalyst as claimed in claim 25, in which the zeolite is substantially free of additional crystalline material.
Claim 29
Dependent Claim
14 words
A catalyst as claimed in claim 18, wherein the cylinders are right circular cylinders.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |