Claims
- 1. A method of pretreating a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal, wherein said catalyst is treated with hydrogen gas in the temperature range of from 1025.degree. to 1275.degree. F. while maintaining the water level of the effluent gas below 200 ppm.
- 2. The method according to claim 1, wherein the moisture level of the effluent gas is maintained below 100 ppm in the temperature range of 1025.degree.-1275.degree. F.
- 3. The method according to claim 1, wherein the temperature is increased at a rate between 5.degree. and 50.degree. F. per hour.
- 4. The method according to claim 1, wherein the temperature is increased at a rate between 10.degree. and 25.degree. F. per hour.
- 5. The method according to claim 1, wherein the temperature is slowly increased in a stepwise fashion.
- 6. The method according to claim 1, wherein the temperature is slowly increased in a ramping fashion.
- 7. The method according to claim 1, wherein, before a temperature of 1025.degree. F. is reached, said catalyst is treated with hydrogen gas while slowly increasing the temperature from 900.degree. to 1025.degree. F., and wherein the water level of the effluent gas is maintained below 200 ppm.
- 8. The method according to claim 1, wherein, before a temperature of 1025.degree. F. is reached, said catalyst is treated with hydrogen gas while slowly increasing the temperature from 900.degree. to 1025.degree. F., and wherein the water level of the effluent gas is maintained below 100 ppm.
- 9. The method of pretreating a reforming catalyst according to claim 1, wherein the catalyst comprises platinum Group VIII metal is platinum.
- 10. The method according to claim 9, wherein the amount of platinum is in the range of from 0.1 to 1.5 wt %.
- 11. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises a large-pore zeolite is selected from the group consisting of zeolite X, zeolite Y, and type L zeolite, beta zeolite, or zeolites having the mazzite structure.
- 12. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises a type L zeolite containing platinum.
- 13. The method of pretreating a reforming catalyst according to claim 1 wherein said catalyst comprises a large-pore zeolite and an inorganic binder.
- 14. The method of pretreating a reforming catalyst according to claim 13, wherein said inorganic binder is selected from the group consisting of silica, alumina, aluminosilicates, and clays.
- 15. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises a large-pore zeolite containing at least one Group VIII metal and an alkali or alkaline earth metal selected from the group consisting of potassium, barium, strontium, calcium, sodium, rubidium, and cesium.
- 16. The method of pretreating a reforming catalyst according to claim 15, wherein said alkaline earth metal is barium and wherein said Group VIII metal is platinum.
- 17. The method of pretreating a reforming catalyst according to claim 15, wherein said catalyst has from 0.1% to 35% by weight of alkali or alkaline earth metal and from 0.1% to 5% by weight platinum.
- 18. The method of preheating a reforming catalyst according to claim 16, wherein said catalyst has from 0.1% to 35% by weight barium and from 0.1% to 5% by weight platinum.
- 19. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises:
- (a) a type L zeolite containing from 0.1% to 5% by weight platinum; and
- (b) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays.
- 20. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises:
- (a) a type L zeolite containing from 0.1% to 35% by weight alkali or alkaline earth metal and from 0.1% to 5% by weight platinum; and
- (b) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays.
- 21. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises:
- (a) a type L zeolite containing from 0.1% to 35% by weight barium and from 0.1% to 5% by weight platinum; and
- (b) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays.
- 22. The method of pretreating a reforming catalyst according to claim 1, wherein said catalyst comprises:
- (a) a type L zeolite containing from 0.1% to 35% by weight barium and from 0.1% to 5% by weight platinum; and
- (b) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays.
- 23. The method according to claim 1, wherein the catalyst is subsequently used to reform a hydrocarbon feedstock containing from about 5 to 15 wt % of C.sub.9 + hydrocarbon.
- 24. A method of pretreating a reforming catalyst comprising a large-pore zeolite, wherein said catalyst is treated with hydrogen while slowly increasing the temperature to a temperature between 1025.degree. and 1275.degree. F. such that the moisture level in the reactor effluent is maintained at a low enough level to permit the number of acid sites on the catalyst to be adequately reduced so as to achieve a catalyst exhibiting longer run lengths.
- 25. A reforming process comprised of contacting a hydrocarbon feed with a large pore zeolite catalyst containing at least one Group VIII metal, wherein the catalyst has been treated by the method according to claim 1.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of U.S. application Ser. No. 976,786, filed Nov. 16, 1992 and now abandoned.
US Referenced Citations (7)
Non-Patent Literature Citations (3)
Entry |
P. G. Menon, Advances in Catalysis Science and Technology, "Some Contribuns to the Surface Chemistry of Platinum Reforming Catalysts", Ed. by T. S. R. Prasada (1985). |
M. Vaarkamp et al, "Influence of Hydrogen Pretreatment on the Structural and Catalytic Properties of Pt/K-LTL Catalyst". |
F. S. Modica et al, "Metal-Support Interactions in Supported Platinum Catalysts". |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
976786 |
Nov 1992 |
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