Zeolite restoration

Details Zeolite restoration Zeolite restoration

1982-09-18

1984-09-25

Gantz, Delbert E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

502 35, 502 38, 502 50, B01J 2396, B01J 3714, B01J 3720, B01J 3724

Patent

active

044736576

ABSTRACT:
Molecular sieve catalysts, such as alumino-silicate zeolites, used in hydrocarbon conversion and separation processes, are restored after their recommended use-cycle service, by novel methods of regeneration and metal redispersion, or rejuvenation.
An additive compound is injected into the catalyst during regeneration, or coke removal. The additive is of a molecular diameter large enough to prevent the additive from being captured by a cell of the catalyst, and is preferably of a pH which promotes adsorption of the additive onto the zeolite material.
Metal-coated zeolite catalysts are rejuvenated, preferably after regeneration, by injecting a halogen compound followed by the above additive compound, and then heating the catalyst to a high temperature. This procedure is effective in re-dispersing metal agglomerates uniformly throughout the catalyst to restore the original metal coating.

REFERENCES:
patent: 4192771 (1980-03-01), Burbidge et al.
patent: 4198287 (1980-04-01), Hemler, Jr. et al.

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