Regeneration of a platinum-containing zeolite
AssigneeUop LLC
InventorsMichelle J. Cohn, Delmar W. Robinson, R. Joe Lawson
Life of this patent
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Abstract
A method is described for the regeneration of a hydrocarbon conversion catalyst that has become deactivated by carbonaceous material deposition where the catalyst comprises a nonacid zeolite and a Group VIII metal component. The method comprises the steps of (1) removing a substantial portion of the carbonaceous material from the catalyst by combustion with an oxygen-containing gas in the presence of a halogen, and (2) reducing the catalyst in the presence of hydrogen.
Claims14
A method for regenerating a deactivated hydrocarbon conversion catalyst comprising a nonacidic zeolite and at least one Group VIII metal component, the catalyst having become deactivated by deposition of carbonaceous materials as a result of previous contact with a hydrocarbon feedstock at hydrocarbon conversion conditions, said regenerating method consisting of the steps of:
- (a) contacting the deactivated catalyst with a gaseous stream comprising oxygen, and a halogen or a halogen-containing compound or a mixture thereof, and an inert component at regeneration conditions including a temperature of from 300.degree.-600.degree. C. sufficient to combust at least a portion of said carbonaceous materials for a first period of time;
- and
- (b) reducing the catalyst from step (a) by contacting the catalyst with a gaseous stream comprising hydrogen at an elevated temperature for a second period of time sufficient to produce a reduced and regenerated hydrocarbon conversion catalyst.
A method for regenerating a deactivated hydrocarbon conversion catalyst comprising an L-zeolite bound within a support matrix comprising alumina, platinum, and sufficient surface-deposited potassium to provide a surface-deposited alkali metal index of 10, the catalyst having become deactivated by deposition of carbonaceous materials as a result of previous contact with a hydrocarbon feedstock at hydrocarbon conversion conditions, said regeneration method consisting of the steps of:
- (a) contacting the deactivated catalyst with a gaseous stream comprising oxygen, hydrogen chloride, and an inert component at regeneration conditions including a temperature of from 300.degree.-600.degree. C. and a gaseous stream oxygen concentration of from 0.1 to 21.0 mole percent sufficient to combust at least a portion of said carbonaceous materials for a first period of time;
- and
- (b) reducing the catalyst from step (a) by contacting the catalyst with a gaseous stream comprising hydrogen at a temperature of from 370.degree.-600.degree. C. for a period of time sufficient to produce a reduced and regenerated hydrocarbon conversion catalyst.
Dependencies are inferred from the claim text.