Spheroidal alumina particles and catalysts employing the particl

Details Spheroidal alumina particles and catalysts employing the particl Spheroidal alumina particles and catalysts employing the particl

1981-07-17

1983-06-28

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 252466PT, 423628, B01J 2104, B01J 2342, B01J 2344, B01J 2346

Patent

active

043904564

ABSTRACT:
Spheroidal alumina particles have a combination of high macroporosity, surface area, crush strength and low attrition loss and bulk density. The particles are prepared by an improved external gelation oil-drop process. In the process a slurry of alumina, preferably a microcrystalline boehmite-pseudoboehmite intermediate, is prepared in an acidic aqueous medium and droplets of the slurry are passed through air into a column containing an upper body of water-immiscible liquid and ammonia and a lower body of aqueous coagulating agent. Catalysts employing the particles as a support and having catalytic agents distributed at controlled depths in the particle have excellent initial and sustained activity and durability, especially for eliminating pollutants in automotive exhaust streams.

REFERENCES:
patent: 3257163 (1966-06-01), Stiles
patent: 3850849 (1974-11-01), Kiovsky et al.
patent: 3979334 (1976-09-01), Lee et al.
patent: 4051073 (1977-09-01), Hegedus et al.

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