Supported catalysts
AssigneeRhone-Poulenc Chimie
InventorsGilbert Blanchard, Thierry Chopin
Life of this patent
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Abstract
Novel supported catalysts, well adapted for the catalytic conversion of exhaust gases emanating from internal combustion engines, include a porous carrier material, e.g., alumina spheres, such porous carrier material having a catalytically effective amount of at least one non-platinum group catalytically active element, e.g., cerium, essentially homogeneously concentrated throughout the depth of a defined peripheral face surface layer (outer band or ring) thereof.
Claims11
A supported catalyst comprising an entirely porous carrier material, said porous carrier material having a catalytically effective amount of at least one catalytically active element essentially homogeneously concentrated throughout a peripheral face surface layer thereof, said at least one catalytically active element comprising cerium and said surface layer having a depth equal to a depth to which reagents are diffused into the catalyst during catalytic conversion thereof by the catalyst.
Dependencies are inferred from the claim text.