Claims
- 1. A process for the dehydrocyclization of non-aromatic hydrocarbons, in which the hydrocarbons are contacted at a temperature of from 430.degree. C. to 550.degree. C. with a catalyst comprising a catalytically active metal on a catalyst base, the catalyst base comprising a zeolite having an X-ray diffraction pattern obtained from CuK.sub..alpha. 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 an aspect ratio of at least 0.5 and a mean diameter of at least 0.5 micron, having at least 90% of the exchangeable cations M as alkali metal ions and said catalytically active metal being at least one Group VIII metal having dehydrogenating activity, so as to convert at least part of the acyclic hydrocarbons into aromatic hydrocarbons.
- 2. The process of claim 1 wherein the zeolite has at least 70% of its crystallites as cylinders.
- 3. The process of claim 1 wherein the cylindrical crystallites have a mean diameter of from 0.5 to 4 micron.
- 4. The process of claim 1 or claim 2 wherein the aspect ratio of the cylinders is from 0.5 to 1.5.
- 5. The process of claim 1 or claim 2 wherein the zeolite has a composition expressed in terms of the molar ratio of oxides assuming an anhydrous state of:
- (0.9-1.3)M.sub.2 /.sub.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.
- 6. The process of claim 5 wherein x is from 5.7 to 7.4.
- 7. The process of claim 6 wherein x is from 6 to 6.5.
- 8. The process of claim 5 wherein M is potassium.
- 9. The process of claim 1 or claim 2 in which the catalytically-active metal is or includes platinum.
- 10. The process of claim 9 comprising 0.4 to 1.2 wt% platinum.
- 11. The process of 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=7.09A')/(d=3.91A') is not greater than 0.2.
- 12. The process of claim 11 in which the zeolite is substantially free of additional crystalline material.
- 13. The process of claim 3 wherein the cylinders are right circular cylinders.
- 14. A process according to claim 1 wherein the hydrocarbons are a mixture of acyclic and aliphatic hydrocarbons.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8214147 |
May 1982 |
GBX |
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Parent Case Info
This is a division of application Ser. No. 724,673 filed Apr. 18, 1985, now U.S. Pat. No. 4,593,133 issued June 3, 1986, which is a division of Ser. No. 493,680 filed May 11, 1983, now U.S. Pat. No. 4,544,539, issued Oct. 1, 1985.
US Referenced Citations (2)
Divisions (2)
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Number |
Date |
Country |
Parent |
724673 |
Apr 1985 |
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Parent |
493680 |
May 1983 |
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