Patent ID: 8536082

Claim:
A method of preparing a dehydrogenation catalyst comprising a group VIII metal, a group IVA metal, a refractory oxide support of specific surface area ranging between 10 and 250 m 2 /g, at least one alkali or alkaline-earth metal in cases where the specific surface area of the support ranges between 175 and 250 m 2 /g, and optionally where the specific surface area of the support ranges between 10 and 175 m 2 /g, said method comprising the following stages: a stage a) of preparing a dry impregnation aqueous solution comprising said group VIII metal, ammonia, either in solution or in gas form, and a complexing agent selected from EDTA and derivatives thereof, at least bidentate primary amine complexes, secondary amine complexes, and pyridine ring derivatives, a stage b) of aging said dry impregnation aqueous solution obtained at the end of stage a), over a period of time ranging between 5 minutes and 24 hours, at a temperature ranging between 15° C. and 100° C., a stage c) of dry impregnation of said refractory oxide support by said aqueous solution obtained at the end of stage b) to obtain an impregnated support, a stage d) of maturing said impregnated support obtained at the end of stage c), said maturation being carried out in a humid medium over a period of time ranging between 30 minutes and 48 hours, a stage e) of drying the matured, impregnated support obtained at the end of stage d), the drying temperature ranging between 80° C. and 200° C., over a period of time ranging between 5 minutes and 5 days, a stage f) of calcining the dried, matured, impregnated support obtained at the end of stage e), the calcination temperature ranging between 300° C. and 850° C. and the calcination time ranging between 5 minutes and 20 hours.