Rejuvenation of supported group VIII metal catalysts

Details Rejuvenation of supported group VIII metal catalysts Rejuvenation of supported group VIII metal catalysts

1975-08-14

1977-01-11

Douglas, Winston A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

208111, 252412, 252416, 252455Z, B01J 2396, B01J 2938, C10G 1302

Patent

active

040025756

ABSTRACT:
Zeolite-supported Group VIII metal hydrogenation catalysts which have undergone damage by thermal and/or hydrothermal stresses, resulting in a maldistribution of the supported metal, are rejuvenated in activity by (1) vapor phase hydration-ammoniation, followed by (2) calcination to effect substantially complete deammoniation and dehydration of the catalyst, and (3) controlled partial rehydration. The partial rehydration step is the critical novel feature of the invention.

REFERENCES:
patent: 3367885 (1968-02-01), Rabo et al.
patent: 3450644 (1969-06-01), Lanewala et al.
patent: 3842114 (1974-10-01), Sie
patent: 3899441 (1975-08-01), Hansford

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