초록 ▼

Provided are high activity catalysts based upon gamma alumina containing substrates impregnated with one or more catalytically active metals, which catalysts in addition contain a nanocrystalline phase of alumina of a crystalline size at the surface of less than 25 .ANG.. Also provided are processes

Provided are high activity catalysts based upon gamma alumina containing substrates impregnated with one or more catalytically active metals, which catalysts in addition contain a nanocrystalline phase of alumina of a crystalline size at the surface of less than 25 .ANG.. Also provided are processes for preparing such high activity catalysts and various uses thereof.

대표청구항 ▼

[ We claim:] [1.]1. 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 alumin

[ We claim:] [1.]1. 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.