Rejuvenation of a deactivated catalyst

Details Rejuvenation of a deactivated catalyst Rejuvenation of a deactivated catalyst

B - Operations, Transporting

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B01J 38/64 (2006.01) B01J 29/90 (2006.01) B01J 38/10 (2006.01) B01J 38/48 (2006.01) B01J 38/60 (2006.01)

Patent

CA 1257245

-?- ABSTRACT OF THE DISCLOSURE In one embodiment of the present invention, a sulfur-contaminated catalyst is rejuvenated by the cyclic process of (1) exposing the catalyst to oxidizing condi- tions in the presence of oxygen at a temperature of from 200°C to 450°C; (2) contacting the oxidized catalyst with at least 10 cc of an aqueous media in the liquid phase per cc of catalyst; wherein the aqueous media is selected from the group consisting of water, an aqueous solution, and a saturated water vapor; and (3) exposing said wet catalyst to reducing conditions in the presence of hydrogen at a temperature of from 200°C to 700°C. In another embodi- ment, the catalyst is contacted with an aqueous solution of a salt of a metal selected from the group consisting of an alkali metal and an alkaline earth metal. In still another embodiment, the catalyst is washed with either a neutral solution or an acidic solution, contacted with an aqueous solution of a salt of a metal selected from the group consisting of an alkali metal and an alkaline earth metal, washed with a neutral solution, and dried.

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