Processes for regenerating catalysts

A process for regenerating a deactivated catalyst comprising at least one Group 10 metal and a microporous crystalline aluminosilicate having a molar ratio of Group 10 metal to Al of greater than or equal to about 0.007:1 in a regeneration zone, wherein the microporous crystalline aluminosilicate is selected from the group consisting of ZSM-5, ZSM-11, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-50, ZSM-57, ZSM-58, an MCM-22 family material, and mixtures or combinations thereof;

• the process comprising the steps of:
• a) supplying a first gaseous stream comprising a chlorine source and an oxygen source to the regeneration zone;
• b) contacting the catalyst with the first gaseous stream under conditions effective for dispersing at least a portion of the at least one Group 10 metal on the surface of the catalyst and for producing a first Group 10 metal chlorohydrate;
• c) withdrawing at least a portion of the first gaseous stream from the regeneration zone to form a first effluent;
• d) supplying a second gaseous stream comprising an oxygen source, and optionally a chlorine source, to the regeneration zone;
• e) contacting the catalyst produced in step b) with the second gaseous stream under conditions effective for increasing the O/Cl ratio of the first Group 10 metal chlorohydrate to produce a second Group 10 metal chlorohydrate;
• f) withdrawing at least a portion of the gaseous streams present in the regeneration zone from the regeneration zone to form a second effluent;
• and
• g) optionally, reducing at least a portion of the second Group 10 metal chlorohydrate to obtain a regenerated catalyst.