Dispersion enhanced pt group metal catalysts

Details Dispersion enhanced pt group metal catalysts Dispersion enhanced pt group metal catalysts

B - Operations, Transporting

01

J

B01J 23/40 (2006.01) B01D 53/94 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2050454

-19- Abstract of the Disclosure A method of making a three-way catalyst based on platinum group metals, comprising: (a) impregnating an alumina substrate with a platinum group metal ion by contacting such substrate with an aqueous solution containing the platinum group metal in an amount of 0.1-5% by weight of alumina substrate and a water soluble acid that forms RCOOH with R being an alkyl or equivalent, said acid being present in an amount of 10-120% by weight of the alumina substrate, the pH of said solution being less than 4.0; and (b) drying and calcining the wetted substrate without sintering said substrate. The three-way catalyst construction based on platinum group metals has enhanced catalytic activity. It comprises an alumina substrate and a platinum group metal impregnation layer thereover, said impregnation layer being comprised of raft-like particle structures, each having increased metal density resulting from the nesting of both small and large metal particles within a given volume. 5315L

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