Process for preparing spheroidal alumina particles

Details Process for preparing spheroidal alumina particles Process for preparing spheroidal alumina particles

1977-03-25

1979-12-18

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 423628, B01J 2104, B01J 3700

Patent

active

041794087

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: 3173883 (1965-03-01), Cornelius et al.
patent: 3257163 (1966-06-01), Stiles
patent: 3558508 (1971-01-01), Keith et al.
patent: 3960772 (1976-06-01), Fort et al.
patent: 3979334 (1976-09-01), Lee et al.
patent: 4003851 (1977-01-01), Ebel et al.
patent: 4006103 (1977-02-01), Meguerian et al.
patent: 4051073 (1977-09-01), Hegedus et al.
patent: 4116882 (1978-09-01), Bendig et al.
patent: 4154812 (1979-05-01), Sanchez et al.
Olechowska et al., Preparation of Spherically Shaped Aluminum Oxide, International Chemical Engineering, vol. 14, No. 1, pp. 90-93 (Jan. 1974).

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