Method and system for core-shell catalyst processing
AssigneeAudi AG
InventorsMinhua Shao, John W. Weidner, Jonathan H. Odell
Life of this patent
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Abstract
According to an embodiment, a method of processing a material for a catalyst includes establishing an electrical potential on a porous electrode. Core particles are directed through the porous electrode. A layer of metal is deposited on the core particles as the particles pass through the porous electrode. According to an embodiment, an example assembly for processing a material for a catalyst includes a housing that establishes a path for particles to move through the housing. A porous electrode is situated within the housing for permitting core particles to move through the porous electrode. A layer of metal can be deposited on the core particles as the particles pass through the porous electrode.
Claims11
A method of processing a material for a catalyst, comprising:
- establishing an electrical potential on a porous electrode;
- directing core particles through the porous electrode;
- depositing a layer of metal on the core particles as the particles pass through the porous electrode;
- mixing the core particles having the deposited layer of metal with a solution including K2PtCl4, citric acid and citrate;
- and
- replacing the deposited layer of metal with platinum to thereby establish a platinum monolayer on the core particles,
- the concentration of citric acid and citrate together is greater than 10 times the concentration of the K2PtCl4 in the solution;
- the porous electrode has a length along a direction that the core particles travel as the core particles pass through the porous electrode;
- and
- the length is selected to facilitate depositing a uniform monolayer of the metal on the core particles.
An assembly for processing a material for a catalyst, the assembly comprising:
- a housing that establishes a path for core particles to move through the housing;
- a porous electrode situated within the housing for permitting core particles to move through the porous electrode whereby a layer of metal can be deposited on the core particles as the core particles pass through the porous electrode;
- and
- a replacement chamber comprising a solution including K2PtCl4, citric acid and citrate, the replacement chamber providing a reservoir for mixing the core particles having a layer of metal deposited with the solution thereby replacing the deposited layer of metal with platinum to establish a platinum monolayer on the core particles,
- the concentration of citric acid and citrate together is greater than 10 times the concentration of the K2PtCl4 in the solution;
- the porous electrode has a length along a direction that the core particles travel as the core particles pass through the porous electrode;
- and
- the length is selected to facilitate depositing a uniform monolayer of the metal on the core particles.
Dependencies are inferred from the claim text.