Construction, method of making and method of using alumina-suppo

Details Construction, method of making and method of using alumina-suppo Construction, method of making and method of using alumina-suppo

1988-07-15

1990-03-06

Russel, Jeffrey E.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

B01D 5336

Patent

active

049064436

ABSTRACT:
A catalyst construction and method of making is disclosed for treating automotive exhaust gases from a fossil fueled internal combustion engine. The construction comprises: (a) a substrate; (b) a coating on said substrate having comingled first and second phases, said first phase comprising ceria and precious metal in microscale intimacy and said second phase comprising precious metal substantially devoid of ceria and separated from the ceria in said first phase on a macroscale. The phases may be in particle form with (i) the first phase particles resulting from the codeposition of CeO.sub.2, precious metal, and Al.sub.2 O.sub.3 from an aqueous solution containing dissolved salts of CeO.sub.2 and precious metal and suspended particles of Al.sub.2 O.sub.3 ; and (ii) the second phase particles resulting from the codeposition of precious metal and Al.sub.2 O.sub.3 from an aqueous solution containing a dissolved salt of the precious metal and suspended particles of Al.sub.2 O.sub.3. Alternatively, the substrate has Al.sub.2 O.sub.3 thereon to increase its surface area, and the two-phase coating is adhered to said Al.sub.2 O.sub.3, said first phase resulting partially from the discontinous deposition of CeO.sub.2 onto said Al.sub.2 O.sub.3 and partially from the continuous deposition of precious metal over said discontinuous CeO.sub.2 and over the exposed Al.sub.2 O.sub.3 ; the precious metal in immediate microscale contact with the CeO.sub.2 constitutes the first phase and the precious metal not immediately in microscale contact with the CeO.sub.2 constitutes the second phase.

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