Catalyst for ammonia oxidation
AssigneeDanmarks Tekniske Universitet
InventorsChristian Nagstrup Conradsen, Sine Ellemann Olesen, Debasish Chakraborty, Ib Chorkendorff
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Abstract
The present invention relates to a bimetallic catalyst for ammonia oxidation, a method for producing a bimetallic catalyst for ammonia oxidation and a method for tuning the catalytic activity of a transition metal. By depositing an overlayer of less catalytic active metal onto a more catalytic active metal, the total catalytic activity is enhanced.
Claims16
A bimetallic catalyst for ammonia oxidation, said bimetallic catalyst comprising:
- a first metal layer, wherein said first metal layer is a Cu layer;
- a second metal layer, wherein said second metal layer is a Ru layer;
- and
- a substrate;
- wherein said first metal layer is located onto said second metal layer and
- wherein said second metal layer is located onto said substrate;
- and
- wherein said first metal layer is a layer of a metal that is less catalytically active towards ammonia oxidation than a metal of said second metal layer;
- and
- wherein said metal of said first metal layer is segregated onto said second metal layer;
- and wherein said metal of said first metal layer does not form an alloy with said metal of said second metal layer, thereby providing a catalyst having a catalytic activity towards ammonia oxidation that is higher than a catalyst having either a single layer of Cu or a single layer of Ru supported on the same substrate.
2-13. (canceled)
A method for tuning the catalytic activity of a transition metal layer comprising depositing a desired thickness of said metal layer as an overlayer onto a transition metal layer, thereby changing the position of the d-band centre of said metal overlayer.
Dependencies are inferred from the claim text.