Process for dispersing or redispersing a group VIII noble metal

Details Process for dispersing or redispersing a group VIII noble metal Process for dispersing or redispersing a group VIII noble metal

1987-08-26

1989-07-18

Konopka, Paul E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

208111, 208140, 502 34, 502 50, 502 66, 502 74, 502 85, B01J 3842, B01J 3804, B01J 2912, B01J 2396

Patent

active

048493856

ABSTRACT:
A process for dispersing or redispersing relatively large crystallites of an agglomerated Group VIII noble metal species present on a porous inorganic support is disclosed. The process includes contacting the agglomerated noble metal species, e.g., palladium or platinum, present on the support, e.g., alumina, silica or a zeolite such as ZSM-5 from which at least a major portion of any extraneous matter such as coke or other residue has previously been removed, with nitric oxide (NO) alone or in admixture with a source of halogen such as Cl.sub.2 and thereafter removing sorbed nitrogen oxide(s). The thus treated metal-loaded catalyst demonstrates substantially increased benzene hydrogenation activity (BHA) compared to the same catalyst prior to treatment indicating significant dispersion/redispersion of the metal crystallities as smaller crystallities.

REFERENCES:
patent: 2963444 (1960-12-01), Nixon
patent: 2963445 (1960-12-01), Nixon
patent: 4657874 (1987-04-01), Bourghard et al.

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