Process for reactivating iridium-containing catalysts

Details Process for reactivating iridium-containing catalysts Process for reactivating iridium-containing catalysts

B - Operations, Transporting

01

J

252/87

B01J 23/96 (2006.01)

Patent

CA 1196623

ABSTRACT OF THE DISCLOSURE Described is a process for reactivating an agglomerated catalyst containing metallic iridium characterized by the steps of: (a) pretreating the catalyst by contact with a substantially elemental oxygen-free atmosphere com- prising a halide-providing compound at an elevated temperature to provide a catalyst comprising about 1.3 weight percent, halide based on the coke-free dry, catalyst; and (b) redispersing the metallic iridium from step (a) by contact at an elevated temperature with an atmosphere comprising a redispersing gas selected from the group of elemental halogen, elemental oxygen, a mixture of hydrogen halide and elemental oxygen, or mixtures thereof. Further embodiments are described including a preferred embodiment wherein the redispersing gas is a mixture of hydrogen halide and elemental oxygen.

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