Patent ID: 6110857
Filing Date: 2000-08-29
Classification: B01J

Abstract:
A process for regenerating a deactivated noble metal-containing supported catalyst which contains iron impurities and wherein iron contamination of the catalyst during regeneration is diminished comprising:(a) heating said deactivated catalyst in an oxygen-containing atmosphere at a flame front temperature in the range of about 375.degree. C. to about 550.degree. C. for a period of time sufficient to remove a substantial portion of coke from said catalyst, to oxidize said noble metal and to convert iron contaminants present in said catalyst into iron oxides;(b) contacting said oxidized catalyst with an atmosphere free of elemental oxygen and containing a reducing gas at a temperature and for a period of time sufficient to substantially reduce said noble metal oxide while said iron oxides are predominantly Fe.sub.3 O.sub.4 and Fe.sub.2 O.sub.3 ;(c) contacting said reduced catalyst at an elevated temperature with a gas stream comprising a halide-providing compound which stream is essentially free of elemental oxygen and elemental halogen and which stream contains from about 0.5 to less than 6 vol. % added water for a period of time sufficient to provide at least about 1.3 wt. % of halide to said catalyst.