Spheroidal alumina particles and catalysts employing the...

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

B - Operations, Transporting

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B01J 21/04 (2006.01) B01J 35/10 (2006.01) B01J 37/00 (2006.01) C01F 7/02 (2006.01) C01F 7/34 (2006.01)

Patent

CA 1126243

ABSTRACT OF THE DISCLOSURE 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, prefer- ably 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-immitcible liquid and ammonia and a lower body of aqueous co- agulating 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.

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