Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Gas or vapor treating
Patent
1988-12-09
1990-08-28
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, 502230, 502261, 502339, B01J 3842, B01J 3804, B01J 2912, B01J 2396
Patent
active
049525433
ABSTRACT:
A process for dispersing or dispersing 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) and halogen, if present. 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 crystallites as smaller crystallites.
REFERENCES:
patent: 2963444 (1960-12-01), Nixon
patent: 2963445 (1960-12-01), Nixon
patent: 3981823 (1976-09-01), Yates
patent: 4657874 (1987-04-01), Borghard et al.
"A Study of the Chemisorption of Nitric Oxide on Pd-Y Zeolite" Che et al.-J. Phys. Chem. 80, No. 21 (1976) pp. 2371-2381.
Huang Yun-Yang
LaPierre Rene B.
McHale William D.
Hobbes Laurence P.
Konopka Paul E.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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