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US 6,284,703 B1Granted
Fixed bed catalysts
AssigneeDegussa-Huels Aktiengesellschaft
InventorsDaniel Ostgard, Konrad Moebus, Monika Berweiler, Barbara Bender, Gernot Stein
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Abstract
A shaped, activated, fixed-bed Raney metal catalyst prepared by a method comprising 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 metal and (3) a moistening agent. Shaping, calcining and activating said catalyst and doping said catalyst with rhenium.
Claims30
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° 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.
5 more elements
A shaped, activated, fixed-bed Raney metal catalyst prepared by a method comprising:
- (i) preparing a mixture of powders comprises 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 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° C., thereby obtaining a sintered catalyst precursor, and
- (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
- (ii) doping said catalyst with rhenium as a promoter after said activation by introducing said catalyst into a perrhenic acid solution, of an initially adjusted pH, for a sufficient period of time to dope the catalyst completely with the rhenium in said perrhenic acid solution.
4 more elements
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 and (2) 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° 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 for a sufficient period of time to dope the catalyst completely with the rhenium in said perrhenic acid solution.
5 more elements
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 and (2) 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° C., thereby obtaining a sintered catalyst precursor, and
- (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
- (ii) doping said catalyst with rhenium as a promoter after said activation by introducing said catalyst into a perrhenic acid solution, of an initially adjusted pH, for a sufficient period of time to dope the catalyst completely with the rhenium in said perrhenic acid solution.
4 more elements
A shaped, activated, calcined fixed-bed Raney metal catalyst, comprising:
- a leached and activated Raney metal alloy catalyst comprising at least one catalytically active Raney process metal, a leachable alloy component and at least one binder material containing pure Raney process metal, the alloy being impregnated with from 0.01 to 30 wt. % Re, and the catalyst having a leached and activated outer layer of a thickness of 0.05 to 1 mm and having a hardness of 200 to 300 N after calcination.
Dependencies are inferred from the claim text.