Patent ID: 6670515
Filing Date: 2003-12-30
Classification: B01J

Abstract:
A material comprising at least one metallic element M of degree of oxidation 0 having catalytic properties, and at least one metallic element Mâ€² having a standard oxidation potential less than that of the element M, at least a portion of the Mâ€² atoms is in an oxidized form; wherein:the material is in the form of particles having a mean dimension less than 50 nm, at least 80% by number of the particles having a mean dimension less than 10 nm; a particle of the material is constituted by: at least one metallic element M of degree of oxidation 0, at least one metallic element Mâ€² in oxidized form, at least one metallic element Mâ€² of degree of oxidation 0, or a combination of at least two species chosen from the three preceding species, it is understood that the mean content of the element M of degree of oxidation 0 in the material is greater than 25% by number of atoms with respect to the whole of the material, the mean total content of the element Mâ€² is at most equal to 75% by number of atoms with respect to the whole of the material, and the mean content of the element Mâ€² in the oxidized form is greater than 10% by number of atoms with respect to the total content of the element Mâ€².