Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1990-11-28
1993-01-12
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502333, 502334, 502506, 502512, 4232135, B01J 2104, B01J 2340
Patent
active
051790602
ABSTRACT:
A method of making a three-way catalyst based on platinum group metals, comprisng: (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.
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Yao et al, "Surface Interactions in the Pt/y-A1203 System", Journal of Catalysis, 59 (1979) 365-374.
Yao et al, "Interactions of Base of Noble Metals with Insulator Supports", Metal-Support and Metal Additive Effects in Catalysis, (B. Imelik et al, Eds) (1982) 159-169.
Huang et al, "The Effect of Solution Variables on Metal Weight Loading During Catalyst Preparation", Applied Catalysis, (1966) 241-248.
Chattha Mohinder S.
Subramanian Somasundaram
Watkins William L. H.
Ford Motor Company
Malleck Joseph W.
May Roger L.
Shine W. J.
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