Patent ID: 6284703
Filing Date: 2001-09-04
Classification: B01J,C07C

Abstract:
A shaped, activated, fixed-bed Raney metal catalyst prepared by a method comprising:(i) preparing a mixture of powders comprising at least one catalyst alloy of (1) at least one catalytically active Raney process metal, a leachable alloy component and optionally a promoter, (2) at least one binder containing at least one pure Raney process metal, and (3) a moistening agent,(i-a) homogenizing said mixture,(i-b) shaping said mixture into a molded catalyst precursor which is not activated,(i-c) calcining said molded catalyst precursor at a temperature below 850.degree. C., thereby obtaining a sintered catalyst precursor,(i-d) activating said sintered catalyst precursor by leaching said leachable alloy component with alkali until the leached, and thereby activated outer layer has a thickness of 0.05 to 1 mm, and(i-e) subsequently washing the final catalyst; and(ii) doping said catalyst with rhenium as a promoter after said activation by introducing said catalyst into a perrhenic acid solution or a solution of a Re salt, for a sufficient period of time to dope the catalyst completely with the rhenium in said perrhenic acid solution.