METHOD FOR MANUFACTURING CORE-SHELL CATALYST

摘要

Provided is a method for manufacturing a core-shell catalyst with high specific activity. The method for manufacturing a core-shell catalyst provided with a core that includes palladium and with a shell which includes platinum and covers the core is characterized by comprising: a step of preparing grains containing palladium which have a peak at 2θ = 40° ±1° in the results of x-ray diffraction measurement and which have a crystal grain size found from the half width at the peak at 2θ = 40° ±1° by the Scherrer method of 5 to 8.5 nm; a copper precipitation step of applying an electric potential more noble than the oxidation-reduction potential of copper to the grains containing palladium in an electrolyte containing copper ions to thereby precipitate copper on the surface of the grains containing palladium; and a substitution step of bringing a platinum-ion-containing solution into contact with the copper precipitated on the surface of the grains containing palladium after the copper precipitation step to thereby substitute platinum for the copper precipitated on the surface of the grains containing palladium and thereby form a shell.