US2017229713A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017229713-A1 |
| Application number | US-201515329057-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 3, 2015 |
| Priority date | Jul 31, 2014 |
| Publication date | Aug 10, 2017 |
| Grant date | — |
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A core-shell catalyst with high platinum mass activity for a short period of time. The method for producing a core-shell catalyst may comprise a core containing palladium and a shell containing platinum and coating the core, the method comprising: a step of preparing a copper-coated palladium-containing particle dispersion in which copper-coated palladium-containing particles are dispersed, the particles being palladium-containing particles coated with copper; a step of preparing a platinum ion-containing solution; a step of preparing a microreactor; and a substitution step of forming the shell by substituting the copper on the copper-coated palladium-containing particle surface with platinum by mixing the copper-coated palladium-containing particle dispersion and the platinum ion-containing solution in the microreactor.
Opening claim text (preview).
What is claimed is: 1 . A method for producing a core-shell catalyst comprising a core containing palladium and a shell containing platinum and coating the core, the method comprising: a step of preparing a copper-coated palladium-containing particle dispersion in which copper-coated palladium-containing particles are dispersed, the particles being palladium-containing particles coated with copper; a step of preparing a platinum ion-containing solution; and a substitution step of forming the shell by substituting the copper on the copper-coated palladium-containing particle surface with platinum by mixing the copper-coated palladium-containing particle dispersion and the platinum ion-containing solution in a microreactor. 2 . The method for producing the core-shell catalyst according to claim 1 , wherein the palladium-containing particles are supported on a support. 3 . The method for producing the core-shell catalyst according to claim 1 , wherein the platinum ion-containing solution comprises a reaction inhibitor for inhibiting a substitution reaction of platinum ions with the copper and the platinum. 4 . The method for producing the core-shell catalyst according to claim 3 , wherein the reaction inhibitor is at least one selected from the group consisting of citric acid, sodium citrate and potassium citrate. 5 . The method for producing the core-shell catalyst according to claim 4 , wherein a citric acid ion concentration of the platinum ion-containing solution is in a range of 0.5 to 2 mol/L. 6 . The method for producing the core-shell catalyst according to claim 1 , wherein the mixing in the substitution step is carried out under a pressure condition of 5 to 200 MPa.
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