发明名称 |
METHOD FOR PRODUCING FINE CATALYST PARTICLES AND METHOD FOR PRODUCING CARBON-SUPPORTED CATALYST |
摘要 |
The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed. Disclosed is a method for producing fine catalyst particles comprising a fine palladium-containing particle and a platinum-containing outermost layer covering at least part of the fine palladium-containing particle, wherein the method comprises: a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing a first dispersion comprising fine palladium-containing particles being dispersed in an acid solution with a copper-containing solution, and applying a potential that is nobler than the oxidation reduction potential of copper to the fine palladium-containing particles in the second dispersion, and a platinum covering step of covering at least part of the fine palladium-containing particle with platinum by substituting the copper covering at least part of the fine palladium-containing particle with platinum by mixing the second dispersion and a platinum-containing solution after the copper covering step, with applying a constant potential that is in a range between a potential that is nobler than the oxidation reduction potential of copper and a potential that is less than the oxidation reduction potential of platinum, to the fine palladium-containing particles. |
申请公布号 |
US2017028385(A1) |
申请公布日期 |
2017.02.02 |
申请号 |
US201515303877 |
申请日期 |
2015.04.03 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
ADACHI Makoto;TAKEHIRO Naoki;KANEKO Keiichi |
分类号 |
B01J23/44;H01M4/88;H01M4/92;B01J35/02;B01J37/02 |
主分类号 |
B01J23/44 |
代理机构 |
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代理人 |
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主权项 |
1. A method for producing fine catalyst particles comprising a fine palladium-containing particle and a platinum-containing outermost layer covering at least part of the fine palladium-containing particle,
wherein the method comprises: a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing a first dispersion comprising fine palladium-containing particles being dispersed in an acid solution with a copper-containing solution, and applying a potential that is nobler than the oxidation reduction potential of copper to the fine palladium-containing particles in the second dispersion, and a platinum covering step of covering at least part of the fine palladium-containing particle with platinum by substituting the copper covering at least part of the fine palladium-containing particle with platinum by mixing the second dispersion and a platinum-containing solution after the copper covering step, with applying a constant potential that is in a range between a potential that is nobler than the oxidation reduction potential of copper and a potential that is less than the oxidation reduction potential of platinum, to the fine palladium-containing particles. |
地址 |
Toyota-shi, Aichi-ken JP |