公开(公告)号：US3692692A

公开(公告)日：1972-09-19

申请号：US3692692D

申请日：1970-10-29

Applicant: UNION OIL CO

Inventor： WARD JOHN W ,  CLARK DANFORD E

IPC: B01J29/90 ,  C10G47/16 ,  B01J11/18 ,  B01J11/08 ,  B01J11/30

CPC classification number: C10G47/16 ,  B01J29/90

Abstract: SILICEOUS ZEOLITE CATALYSTS COMPRISING ZEOLITE MONOAND/OR DIVALENT METAL CATIONS AND A NON-ZEOLITIC GROUP VIII METAL HYDROGENATING COMPONENT SUPPORTED THEREON, WHICH CATALYSTS HAVE UNDERGONE DAMAGE BY THERMAL AND/ OR HYDROTHERMAL STRESSES RESULTING IN A MALDISTRIBUTION OF THE METAL COMPONENTS, ARE REJUVENATED IN ACTIVITY BY A SEQUENTIAL TREATMENT WITH AN AQUEOUS AMMONIUM SALT TO EXCHANGE OUT AT LEAST A PORTION OF THE ZEOLITIC MONOAND/OR DIVALENT METAL IONS, AND WITH AQUEOUS AMMONIA TO EFFECT A REDISTRIBUTION OF THE GROUP VIII METAL. THE TREATMENTS MAY BE PERFORMED IN EITHER ORDER.