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US 7,070,757 B2Granted
Method for producing catalysts consisting of metal of the platinum group by means of electroless deposition and the use thereof for the direct synthesis of hydrogen peroxide
AssigneeBASF SE
InventorsMartin Fischer, Thomas Butz
Life of this patent
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Abstract
Catalysts produced by electroless deposition of at least one platinum metal on a nonporous nonmetallic support can be used for the synthesis of hydrogen peroxide from the elements and for the hydrogenation of organic compounds.
Claims23
A process for producing a catalyst comprising at least one platinum metal supported on a nonporous nonmetallic suppolt;
- wherein said platinum metal is selected from the group consisting of Ru, Os, Rh, Ir, Pd, Pt, and combinations thereof, and
- wherein the support is in the form of a particulate structure having a particle size of from 0.25 nm to 10 mm or in the form of a shaped body, which is selected from the group consisting of a sphere, a pellet, a short extrudate, an open-walled cylinder having inwardly bent protrusions, a cylinder, a saddle, a cylindrical mesh packing element, a hackette, a spiral, a helix, a monolith comprising woven fabric,
- said process comprising:
- activating the support and electrolessly depositing said at least one platinum metal on the activated support by contacting the support with an aqueous medium comprising at least one compound or one complex of said platinum metal and at least one reducing agent.
1 more element
A process for producing a catalyst comprising at least one metal supported on a nonporous nonmetallic support;
- wherein said metal is selected from the group consisting of Ru, Os, Rh, Ir, Pt, and combinations thereof, and
- wherein the support is in the form of a particulate structure having a particle size of from 0.25 nm to 10 mm or in the form of a shaped body, which is selected from the group consisting of a sphere, a pellet, a short extrudate, an open-walled cylinder having inwardly bent protrusions, a cylinder, a saddle, a cylindrical mesh packing element, a hackette, a spiral, a helix, a monolith comprising woven fabric;
- said process comprising:
- activating the support by contacting the support with
- a first aqueous medium comprising at least one compound or one complex of a palladium metal and
- a second aqueous medium comprising at least one reducing agent having a redox potential less than the redox potential of the one complex of the palladium metal;
- and
- electrolessly depositing at least one metal on the activated support by contacting a third aqueous medium comprising at least one compound or one complex of the metal and at least one reducing agent having a redox potential less than the redox potential of the one complex of the metal;
- wherein the metal is selected from the group consisting of Ru, Os, Rh, Ir, Pt, and combinations thereof.
6 more elements
Dependencies are inferred from the claim text.