Catalyst composition containing an intimately mixed oxide of...

B - Operations – Transporting – 01 – J

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B01J 23/10 (2006.01) B01D 53/94 (2006.01) B01J 23/63 (2006.01)

Patent

CA 2285634

A catalyst suitable for the treatment of automotive engine exhaust exhibiting enhanced oxygen storage capacity. The catalyst composition contains, in addition to a catalytic material such as one or more of platinum, rhodium and palladium dispersed on an activated alumina support, an oxygen storage component ("OSC") which is an intimately mixed oxide of ceria and praseodymia having a Pr.Ce atomic ratio in the range of about 2:100 to 100:100 and optionally containing one or more other rare earth metal oxides. The OSC is segregated from the catalytic material and may optionally have dispersed thereon a limited amount of a second catalytic metal component, such as platinum, rhodium and/or palladium. The intimately mixed oxide may be formed by co-precipitation, by impregnation of bulk ceria particles with a praseodymium precursor, or any other method to form an intimately mixed oxide. The OSC may comprise at least about 5 % by weight of the combined weight of the OSC and the catalytic component.

L'invention concerne un catalyseur destiné au traitement de l'échappement des moteurs automobiles présentant une capacité améliorée de stockage d'oxygène. La composition catalyseur contient, en plus d'un ou plusieurs matériaux catalyseurs tel que platine, rhodium et palladium dispersés sur un support d'alumine activée, un composant formant réserve d'oxygène ("OSC") qui est un oxyde de cérium et de praséodyme intimement mélangé dans un rapport atomique Pr:Ce compris entre environ 2:100 et 100:100 et qui contient éventuellement un ou plusieurs autres oxydes métalliques de terres rares. L'OSC, qui est séparé du matériau catalyseur, peut comporter une quantité limitée d'un second composant métallique catalyseur, dispersée sur ce matériau, ce second composant pouvant être notamment du platine, du rhodium et/ou du paladium. L'oxyde intimement mélangé peut être obtenu par coprécipitation, par imprégnation de particules de cérium en vrac avec un précurseur praséodyme ou par tout autre procédé permettant de former un oxyde intimement mélangé. L'OSC peut contenir au moins environ 5 % en poids du poids combiné de l'OSC et du composant catalyseur.

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