Dewaxing catalysts and processes using the same
AssigneeExxonMobil Technology and Engineering Company
InventorsWilliam J. Knaeble, Preeti Kamakoti, Scott J. Weigel
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Abstract
Provided herein are catalysts for dewaxing of a feedstock, the catalyst comprising between about 40 wt. % and about 99.9 wt. % zeolite, between about 0 wt. % and about 40 wt. % binder and at least about 0.1 wt. % noble metal, as well as catalyst systems, methods and products produced using the catalysts. The zeolite having a crystal comprising a largest included sphere less than or equal to about 7.5 angstroms, a largest diffusing sphere greater than or equal to about 5.0 angstroms, and a silica to alumina ratio greater than or equal to about 100:1. The catalyst having a temperature-programmed ammonia desorption (“TPAD”) of less than about 0.25 mmol/g.
Claims25
A method for dewaxing to produce base stocks comprising:
- contacting a hydrocarbon feedstock with a catalyst, wherein the catalyst comprises:
- between about 40 wt. % and about 99.9 wt. % zeolite, wherein the zeolite comprises a crystal having a largest included sphere less than or equal to about 7.5 angstroms, a largest diffusing sphere greater than or equal to about 5.0 angstroms, and a silica to alumina ratio greater than or equal to about 100:1;
- between about 0 wt. % and about 60 wt. % binder, wherein the binder is selected from alumina, silica, titania or a mixture thereof, and
- greater than or equal to about 0.1 wt. % noble metal, wherein the catalyst has a TPAD of less than or equal to about 0.25 mmol/g, and wherein a metal to acid molar ratio is greater than 0.1;
- and
- dewaxing the hydrocarbon feedstock to produce a base stock.
A method for dewaxing to produce base stocks comprising:
- contacting a hydrocarbon feedstock with a catalyst system, wherein the catalyst system comprises:
- a catalyst bed having two or more separate regions in a stacked configuration, wherein the two or more separate regions comprise a first region and a second region, wherein the first region comprises a first catalyst comprising:
- between about 40 wt. % and about 99.9 wt. % zeolite, wherein the zeolite comprises a crystal having a largest included sphere less than or equal to about 7.5 angstroms, a largest diffusing sphere greater than or equal to about 5.0 angstroms, and a silica to alumina ratio greater than or equal to about 100:1;
- between about 0 wt. % and about 60 wt. % binder, wherein the binder is selected from alumina, silica, titania or a mixture thereof, and
- greater than or equal to about 0.1 wt. % noble metal, wherein the catalyst has a TPAD of less than or equal to about 0.25 mmol/g, and wherein a metal to acid molar ratio is greater than 0.1, and
- wherein the second region comprises a second catalyst having between about 40 wt. % and about 99.9 wt. % zeolite comprising a crystal having 11 ring members (11 MR) or less and a silica alumina ratio greater than or equal to about 50, and
- wherein the first region and the second region are in fluidic communication providing a fluidic pathway of a composition from the first region to the second region;
- and
- dewaxing the hydrocarbon feedstock in the catalyst system to produce a base stock.
Dependencies are inferred from the claim text.