Method for regenerating a Group VIII noble metal deactivated catalyst
AssigneeExxon Research & Engineering Co.
InventorShun C. Fung
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Abstract
A method for regenerating a Group VIII noble metal catalyst which has been contaminated with coke during a reforming process. The method comprises (a) burning off the coke from the catalyst, (b) redispersing the noble metal on the surface of the catalyst support by contacting the catalyst with halogen gas and carbon dioxide, and (c) chemically reducing the catalyst. The presence of carbon dioxide in the redispersing step improves the activity of the regenerated catalyst.
Claims17
A method for regenerating and reactivating a coke contaminated deactivated catalyst comprising at least one group VIII noble metal, a support and a binder which method comprises:
- (a) removing substantially all of the coke from the catalyst;
- (b) redispersing the noble metal(s) on the support, the redispersion being carried out by contacting the catalyst in a reaction vessel with a halogen or halide containing gas with a source of oxygen present (oxychlorination), and carbon dioxide, the amount of carbon dioxide being maintained at a partial pressure of at least 2 kPa in the reaction vessel substantially throughout the period in which the catalyst is in contact with the halogen or halide containing gas;
- (c) stabilizing the catalyst by treatment with an inert or oxygen containing gas;
- (d) substantially removing carbon dioxide and carbon monoxide so that the amount of carbon dioxide and carbon monoxide in the reaction vessel during the reduction step (e) is less than 0.025 kPa partial pressure;
- (e) chemically reducing the catalyst.
Dependencies are inferred from the claim text.