Patent ID: 6239066
Filing Date: 2001-05-29
Classification: B01J,C10G,Y10S

Abstract:
A process for preparing a catalyst composition having a particulate porous support comprising gamma alumina having a crystallite size of greater than 30 .ANG., wherein the catalyst composition comprises at least one catalytically active metal and a nanocrystalline phase of alumina of a crystallite size up to 25 .ANG. at the surface, and has a mesopore structure exhibiting porosity peaking in a first region of 40 .ANG. or less, as measured by nitrogen porosimetry using the desorption isotherm, the process comprising the steps of:(1) impregnating a particulate porous support comprising gamma alumina and amorphous alumina, with one or more catalytically active metals;(2) prior to, concurrently with, or subsequent to step (1), wetting the support by contact with ahelating agent in a carrier liquid;(3) aging the wetted support while wet;(4) drying the aged support at a temperature and under conditions to substantially volatilize the carrier liquid; and(5) calcining the dried support.