Catalyst – solid sorbent – or support therefor: product or process – Forming or treating a sphere – process only – Treating preformed sphere only
Patent
1982-05-26
1983-10-04
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Forming or treating a sphere, process only
Treating preformed sphere only
502304, 4232135, B01J 2310, B01J 3700
Patent
active
044077351
ABSTRACT:
A method of impregnating spheres of activated alumina with cerium in an oxidized state. The cerium-impregnated alumina spheres are for use in catalyst supports for three-way catalysts for purification of exhaust gases of automotive engines. The method has the steps of wetting spheres of activated alumina with an aqueous solution of a cerium salt, drying the wet spheres and calcining the dried spheres in an oxidizing atmosphere. The drying is performed so as to complete the removal of water from the spheres by evaporation in a time period not longer than 10 min, preferably by subjecting the wet spheres to microwave heating and most preferably by performing the microwave heating with a forced draft. By quickly completing the drying the distribution of cerium in the individual spheres becomes very uniform, and this has the effect of improving the efficiency of three-way catalysts produced by using the cerium-impregnated spheres of activated alumina.
REFERENCES:
patent: 4206087 (1980-06-01), Keith et al.
Nissan Motor Company Limited
Shine W. J.
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