Bi-metallic three-way catalyst materials and appurtenant devices and systems
AssigneeGM Global Technology Operations LLC
InventorsMing Yang, Se H. Oh, Wei Li
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Abstract
Bimetallic three-way catalyst devices include a support body, one or more Rh bulk deposits disposed on the support body, and a plurality of Pt atomic clusters disposed on the surface of each of the Rh bulk deposits. Substantially no Pt is deposited on the support body. At least 85% by weight of the Pt atomic clusters comprise up to 10 atoms and the maximum Pt atomic cluster size is 200 Pt atoms. The combined loading of Rh and Pt can be less than 1.5% by weight relative to the weight of the support body. The molar ratio of Rh in a bulk Rh deposit to Pt disposed on the surface of that deposit is at least 5:1.
Claims20
A catalytic device, the device comprising:
- a support body formed from a porous non-metal material;
- one or more Rh bulk deposits disposed on the support body;
- and
- a plurality of Pt atomic clusters disposed on the surface of at least one of the Rh bulk deposits, wherein at most 10% by weight of the Pt atomic clusters are disposed directly on the support body.
A catalytic device, the device comprising:
- a support body formed from a porous non-metal material;
- one or more Rh bulk deposits disposed on the support body;
- and
- a plurality of Pt atomic clusters disposed on at least one of the Rh bulk deposits, wherein at least 85% by weight of the Pt atomic clusters comprise up to 10 Pt atoms, and the maximum Pt atomic cluster size is 200 Pt atoms.
A bimetallic three-way catalyst device (TWC) configured to treat exhaust gas generated by a gasoline internal combustion engine, the bimetallic three-way catalyst device comprising:
- a canister;
- a support body disposed within the canister;
- wherein the support body is formed from a porous non-metal material;
- a plurality of Rh bulk deposits disposed on the support body;
- and
- a plurality of Pt atomic clusters disposed on at least one of the Rh bulk deposits, wherein at least 85% by weight of the Pt atomic clusters comprise up to 10 Pt atoms, and the maximum Pt atomic cluster size is 200 Pt atoms.
Dependencies are inferred from the claim text.