ES469484A3 - AN IMPROVED PROCEDURE FOR THE REGENERATION OF A CATALYST FOR THE CONVERSION OF HYDROCARBONS. - Google Patents

Abstract

An improved process for regenerating a catalyst for the conversion of hydrocarbons, said catalyst having been at least partially deactivated by the deposition of carbon residues thereon, during contact with a hydrocarbon filler, under hydrocarbon conversion conditions, the catalyst comprises 0.01 to 3.0 weight percent of an iridium component on a refractory inorganic oxide support, wherein the improvement is characterized in that it comprises the following steps: (1) contacting the catalyst in a reaction zone with a gaseous mixture containing oxygen at a temperature not exceeding 454ºC for sufficient time to burn at least a portion of the carbon residue of said catalyst, the duration of the contact at the elevated temperature to convert more than about 70 percent by weight of the iridium in the catalyst in agglomerates with higher years of crystallites of approximately 50 a; (2) contacting the already depleted catalyst of the carbon residue in the reaction zone prior to its contact with an oxygen-containing gas substantially free of halogen at a temperature of 204 to 593ºC for sufficient time to convert a portion substantially of said iridium in its metallic form, said step (2) being carried out before contacting the spent catalyst of the carbon residue with the gas containing, oxygen substantially free of halogen, at a temperature sufficient to agglomerate the iridium further on the catalyst; (3) contacting said treated catalyst of step (2) having a substantial portion of the iridium contained therein in metallic form in said reaction zone with a gas containing elemental halogen at a temperature of at least 454ºC being introduced the gas in said reaction zone at a rate such that the halogen concentration of the treatment gas at the outlet of said reaction zone is at least 50 percent of the halogen concentration at the input within a period of at least 15 minutes from the introduction of said treatment gas through the entrance of said reaction zone; (4) contacting the halogen-treated catalyst of step (3) in said reaction zone with a halogen-containing gas at a temperature of 204 to 593ºC for a period sufficient to convert a substantial portion of said iridium to its form metal; and (5) contacting the catalyst treated in step (4) having a substantial portion of the iridium contained therein in the metallic form in said reaction zone with a gas containing elemental halogen at a temperature of at least about 454º c, for a sufficient time to redisperse, at least, a portion of the iridium on the catalyst. (Machine-translation by Google Translate, not legally binding)