B.E.T. specific surface-stabilized ceria

Details B.E.T. specific surface-stabilized ceria B.E.T. specific surface-stabilized ceria

1992-12-09

1996-06-25

Lieberman, Paul

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

Catalyst or precursor therefor

Silicon containing or process of making

502235, 502439, B01J 2108, B01J 2310, B01J 3510, B01J 3703

Patent

active

055299695

ABSTRACT:
Ceric oxide (ceria) particulates exhibiting a particularly small crystallite size, well suited for catalyst/catalyst carrier applications, include a specific surface-stabilizing amount of silicon values (preferably less than 1% by weight thereof, expressed as SiO.sub.2) and have a specific surface of at least 40 m.sup.2 /g after calcination at 800.degree. C. for 6 hours and of at least 20 m.sup.2 /g after calcination at 1,000.degree. C. for 6 hours; such CeO.sub.2 particulates are advantageously prepared by (a) suspending certain ceric hydroxides in a basic aqueous reaction medium containing a silicon compound, (b) autoclaving the resulting suspension, (c) cooling and depressurizing such medium of reaction, (d) separating a ceric hydroxide therefrom, and (e) calcining the ceric hydroxide thus separated.

REFERENCES:
patent: 4663137 (1987-05-01), Chane-Ching et al.
patent: 4940685 (1990-07-01), Sauvion et al.
patent: 5017352 (1991-05-01), Chane-Ching et al.
patent: 5064803 (1991-11-01), Nunan
patent: 5080877 (1992-01-01), Chane-Ching et al.

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