FOERFARANDE FOER AOTERAKTIVERING AV KATALYSATORER INNEHAOLLANDE IRIDIUM.

摘要

The invention concerns a process for reactivating an agglomerated catalyst containing metallic iridium comprising the steps of: (a) pretreating the catalyst by contact with a substantially elemental oxygen-free atmosphere comprising 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 redspersing gas selected from elemental halogen, elemental oxygen, a mixture of hydrogen halide and elemental oxygen and mixtures thereof. Further embodiments are described including a preferred one wherein the redispersing gas is a mixture of hydrogen halide and elemental oxygen.