| 摘要 |
<p>Supported iridium-containing hydrocarbon conversion catalysts which are at least partially deactivated due to the deposition of carbonaceous residues thereon during contact with hydrocarbons are regenerated by (1) contacting the catalyst in a reaction zone with oxygen to burn at least a portion of the carbonaceous residues from the catalyst, (2) contacting the carbonaceous residuedepleted catalyst in a reaction zone with hydrogen at an elevated temperature to reduce a substantial portion of the iridium present on the catalyst to its metallic form, (3) contacting the treated catalyst in a reaction zone with an elemental halogen-containing gas in a reaction zone with an elemental halogen-containing gas at a temperature greater than about 850 DEG F., said gas being introduced into said reaction zone at a rate such that the halogen concentration of the treating gas at the outlet of said reaction zone is at least 50% of the inlet halogen concentration within at least 15 minutes from the time of the introduction of said treating gas into the inlet of said reaction zone, (4) contacting the treated catalyst in a reaction zone with hydrogen at an elevated temperature to reduce a substantial portion of the iridium present in the catalyst to its metallic form, and (5) contacting the catalyst from step (4) in a reaction zone with an elemental halogen-containing gas at a temperature of at least about 850 DEG F. Steps (4) and (5) may be repeated, in sequence, at least one additional time to redisperse the iridium catalyst component to a highly active, high surface area state.</p> |
