Supported platinum catalyst and manufacturing method of the same

Patent metadata

Field	Value
Publication number	US-9929412-B2
Application number	US-201615141824-A
Country	US
Kind code	B2
Filing date	Apr 29, 2016
Priority date	Jun 16, 2015
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A manufacturing method of a supported platinum catalyst, includes: generating a platinum group salt solution using platinum group salts and a complexing agent; mixing the platinum group salt solution and a carbon powder dispersion in which carbon powder is dispersed; and adding a reducing agent to a mixed solution of the platinum group salt solution and the carbon powder dispersion, and reducing the platinum group salts to allow the platinum group particles to be supported on the carbon powder.

First claim

What is claimed is:

1. A supported platinum catalyst comprising:
a carbon powder support which contains a carbon powder having pores; and
platinum particles supported on the carbon powder support,
wherein the platinum has a particle diameter distribution of 1.0 nm to 6.0 nm to suppress loading of particles of the platinum in the pores of the carbon powder of the carbon powder support.

2. The supported platinum catalyst of claim 1 ,
wherein an average particle diameter of the platinum is from 1.5 nm to 3.5 nm.

3. The supported platinum catalyst of claim 2 ,
wherein a percentage of the platinum present in a portion from a surface of the carbon powder support to a depth of 10 nm to a total amount of the platinum supported on the carbon powder support is equal to or greater than 70%.

4. The supported platinum catalyst of claim 1 ,
wherein a percentage of the platinum present in a portion from a surface of the carbon powder support to a depth of 10 nm to a total amount of the platinum supported on the carbon powder support is equal to or greater than 70%.

5. A manufacturing method of a supported platinum catalyst comprising:
generating a platinum salt solution using platinum salts and a complexing agent;
mixing the platinum salt solution and a carbon powder dispersion in which carbon powder having pores is dispersed; and
adding a reducing agent to a mixed solution of the platinum salt solution and the carbon powder dispersion, and reducing the platinum salts to allow platinum particles to be supported on the carbon powder,
wherein the platinum particles have a particle diameter distribution of 1.0 nm to 6.0 nm to suppress loading of the platinum particles in the pores of the carbon powder.

6. The manufacturing method of a supported platinum catalyst of claim 5 ,
wherein carbon powder and a dispersing agent are mixed and dispersed in the carbon powder dispersion.

7. The manufacturing method of a supported platinum catalyst of claim 6 ,
wherein the number of carbon atoms of the complexing agent is equal to or greater than 6.

8. The manufacturing method of a supported platinum catalyst of claim 5 ,
wherein the number of carbon atoms of the complexing agent is equal to or greater than 6.

9. The manufacturing method of a supported platinum catalyst of claim 5 , wherein a solvent of the platinum salts solution and a solvent of the carbon powder dispersion contain water.

Assignees

• Panasonic Corp

Inventors

• Ueyama Yasuhiro
• Kojima Toshiyuki
• Taniguchi Yasushi
• Kubota Kazunori
• Takahashi Hideyuki
• Yokoyama Shun
• Tohji Kazuyuki
• Tsuchida Shuzo

Classifications

• B01J37/031

  Precipitation · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• B01J23/42

  Platinum · CPC title