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Title:
METHOD FOR PRODUCING CORE-SHELL CATALYST PARTICLES
Document Type and Number:
WIPO Patent Application WO/2015/122104
Kind Code:
A1
Abstract:
Provided is a method for producing core-shell catalyst particles which have high catalytic activity per unit mass of platinum. A method for producing core-shell catalyst particles, each of which comprises a core containing palladium and a shell that contains platinum and covers the core. This method for producing core-shell catalyst particles is characterized by comprising: a step wherein a potential that is higher than the oxidation-reduction potential of copper is applied to palladium-containing particles in a copper ion-containing electrolyte solution, so that copper is deposited on the surface of each palladium-containing particle; and a step wherein a platinum ion-containing solution, which contains platinum ions and a reaction inhibitor that suppresses a substitution reaction between copper and platinum, is brought into contact with the copper deposited on the surface of each palladium-containing particle within a reaction system that is maintained at from -3°C to 10°C (inclusive) after the copper deposition step, so that the copper deposited on the surface of each palladium-containing particle is substituted by platinum, thereby forming the above-described shell.

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Inventors:
KANEKO KEIICHI (JP)
KIMURA HIROKO (JP)
ADACHI MAKOTO (JP)
Application Number:
PCT/JP2014/083894
Publication Date:
August 20, 2015
Filing Date:
December 22, 2014
Export Citation:
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Assignee:
TOYOTA MOTOR CO LTD (JP)
International Classes:
B01J37/34; B01J23/44; B01J35/08; B22F1/17; C23C18/42; C25D7/00; H01M4/86; H01M4/88; H01M4/92
Domestic Patent References:
WO2012115624A12012-08-30
WO2013192056A12013-12-27
WO2012105107A12012-08-09
Foreign References:
CN103506144A2014-01-15
JP2012157833A2012-08-23
JP2015000398A2015-01-05
Other References:
See also references of EP 3106223A4
Attorney, Agent or Firm:
KISHIMOTO, Tatsuhito et al. (JP)
Kishimoto Expert (JP)
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