Patent ID: 6054409
Filing Date: 2000-04-25
Classification: B01J,C07C

Abstract:
A catalyst in the form of spherules or extrudates, comprising palladium and silver, incorporated as metallic particles on an alumina support, at least 30% of said metallic particles containing both palladium and silver, as measured by electron microscopy said alumina support having a specific surface of from 5 to 60 m.sup.2 /g, the weight ratio of silver to palladium being higher than 0.4:1 to 3:1, a proportion of at least 80% of the palladium and a proportion of at least 80% of silver being present in a volume at the periphery of the catalyst delimited by a spherical or cylindrical surface with radius r.sub.1 corresponding to the average radius of the catalyst spheniles or extrudates and a spherical or cylindrical surface with radius r.sub.2 corresponding to the average radius of the catalyst spherules or extrudates and a spherical or cylindrical surface with radius r.sub.2 which is at least equal to 0.8 r.sub.1.