Method for manufacturing noble metal fine particles
a technology of noble metal and fine particles, which is applied in the field of noble metal fine particle manufacturing, can solve the problems of unduly large particle diameter of obtained noble metal particles, inability to achieve uniform composition, and inability to improve crystallinity and purity of noble metal particles, etc., and achieves easy control and high crystallinity and purity. high
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example 1
[0057]3 g of metal Rh powder and a 35 mol % NaCl-65 mol % CsCl mixture were mixed in a weight ratio of 1:10. After the mixture was melted at 650° C. under an atmosphere of Ar gas to obtain a molten salt mixture containing the Rh powder, chlorine gas was insufflated into the molten salt mixture in the amount corresponding to 3 times of the equivalent amount of the Rh powder while the molten salt mixture was maintained at 650° C., to generate an Rh chloride.
[0058]Next, the molten salt mixture containing the Rh chloride was melted at 650° C. under an atmosphere of Ar gas. Then, while the molten salt mixture was maintained at 650° C., Na2CO3 was added to the molten salt mixture in the amount corresponding to 1.5 times of the equivalent amount of the Rh chloride, and bubbling was conducted with Ar gas for 1 hour to mix the mixture. Then, the mixture was cooled and washed with water, and an Rh oxide was collected as a black precipitate.
[0059]Next, the Rh oxide was mixed with CaCO3 whose a...
example 2
[0061]3 g of a metal Pt piece and a 35 mol % NaCl-65 mol % CsCl mixture were mixed in a weight ratio of 1:10. After the mixture was melted at 650° C. under an atmosphere of Ar gas to obtain a molten salt mixture containing the Pt piece, chlorine gas was insufflated into the molten salt mixture in the amount corresponding to 4 times of the equivalent amount of the Pt piece while the molten salt mixture was maintained at 650° C., to generate a Pt chloride.
[0062]Next, the molten salt mixture containing the Pt chloride was melted at 650° C. under an atmosphere of Ar gas. Then, while the molten salt mixture was maintained at 650° C., Na2CO3 was added to the molten salt mixture in the amount corresponding to 2 times of the equivalent amount of the Pt chloride, and bubbling was conducted with Ar gas for 1 hour to mix the mixture. Then, the mixture was cooled and washed with water, and a Pt oxide was collected as a black precipitate.
[0063]Next, the Pt oxide was mixed with CaCO3 whose amount...
example 3
[0065]1.6 g of metal Rh powder and a 35 mol % NaCl-65 mol % CsCl mixture were mixed in a weight ratio of 1:10. After the mixture was melted at 650° C. under an atmosphere of Ar gas to obtain a molten salt mixture containing the Rh powder, chlorine gas was insufflated into the molten salt mixture in the amount corresponding to 3 times of the equivalent amount of the Rh powder while the mixture was maintained at 650° C., to generate an Rh chloride.
[0066]Similarly, 2.4 g of a metal Pt piece and the molten salt mixture was mixed in a weight ratio of 1:10. After the molten salt mixture was melted at 650° C. under an atmosphere of Ar gas, chlorine gas was insufflated into the molten salt mixture in the amount corresponding to 4 times of the equivalent amount of the Pt piece while the molten salt mixture was maintained at 650° C., to generate a Pt chloride.
[0067]Next, the Pt chloride and the Rh chloride were mixed in a weight ratio of 6:4. The molten salt mixture containing these chlorides...
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