Catalyst for purification of exhaust gas, regeneration...

B - Operations – Transporting – 01 – J

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B01J 23/63 (2006.01) B01D 53/94 (2006.01) B01D 53/96 (2006.01) B01J 23/58 (2006.01) B01J 23/89 (2006.01) B01J 23/96 (2006.01) F01N 3/10 (2006.01) F01N 3/20 (2006.01)

Patent

CA 2648314

A catalyst for purification of exhaust gas in which a noble metal is supported on a metal-oxide support wherein, in a oxidation atmosphere, the noble metal exists on the surface of the support in high oxidation state, and the noble metal binds with a cation of the support via an oxygen atom on the surface of the support to form a surface oxide layer and, in a reduction atmosphere, the noble metal exists on the surface of the support in a metal state, and an amount of noble metal exposed at the surface of the support, measured by Co chemisorption, is 10% or more in atomic ratio to a whole amount of the noble metal supported on the support.

La présente invention concerne un catalyseur de purification de gaz d'échappement comprenant un métal noble porté sur un support d'oxyde, où : sous une atmosphère oxydante, le métal noble existe dans l'état d'oxydation le plus élevé sur la surface du support et le catalyseur possède une couche d'oxyde en surface formé par le métal noble liant un cation dans le support par l'intermédiaire de l'oxygène sur la surface du support ; tandis que sous une atmosphère réductrice, le métal noble existe dans un état métallique sur la surface du support et la quantité du métal noble exposée sur la surface du support, qui est mesurée par le procédé d'absorption chimique de CO, est supérieure ou égale à 10 % atomique sur la base de la quantité totale de métal noble portée par le support.

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