Ruthenium nanoparticles with essentially face-centered cubic structure and method for producing the same

Patent metadata

Field	Value
Publication number	US-11035053-B2
Application number	US-201214344840-A
Country	US
Kind code	B2
Filing date	Sep 13, 2012
Priority date	Sep 16, 2011
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

Disclosed are ruthenium nanoparticles having an essentially face-centered cubic structure. Disclosed is a method for producing ruthenium nanoparticles having an essentially face-centered cubic structure. This production method includes a step (i) of maintaining a solution containing ruthenium (III) acetylacetonate, polyvinylpyrrolidone, and triethylene glycol at a temperature of 180° C. or higher.

First claim

The invention claimed is:

1. Ruthenium nanoparticles consisting essentially of a face-centered cubic structure, wherein the ruthenium nanoparticles consist of ruthenium, and wherein the ruthenium nanoparticles have at least one peak of diffraction angle 2θ from about 46° to about 48° from (200) plane in X-ray diffraction with CuKα rays.

2. A carbon monoxide oxidation catalyst comprising the ruthenium nanoparticles according to claim 1 .

3. The ruthenium nanoparticles according to claim 1 , wherein an average particle diameter of the ruthenium nanoparticles is 7 nm or less.

4. The ruthenium nanoparticles according to claim 1 , wherein the ruthenium nanoparticles have peaks of diffraction angle 2θ from about 41° to about 42° from (111) plane, from about 68° to about 70° from (220) plane, from about 83° to about 84° from (311) plane, and from about 88° to about 89° from (222) plane in X-ray diffraction with CuKα rays.

5. A method for producing the ruthenium nanoparticles according to claim 1 comprising a step (i) of maintaining a solution containing ruthenium (III) acetylacetonate, polyvinylpyrrolidone, and triethylene glycol at a temperature of 180° C. or higher, thereby producing the ruthenium nanoparticles of claim 1 .

6. The method according to claim 5 , wherein, in the step (i), the solution is maintained at a temperature ranging from 180° C. to 220° C.

7. The method according to claim 5 , wherein the step (i) comprises:
a step (a) of preparing a first organic solution containing polyvinylpyrrolidone and triethylene glycol and a second organic solution containing ruthenium (III) acetylacetonate; and
a step (b) of spraying the second organic solution into the first organic solution heated to a temperature ranging from 200° C. to 220° C.

8. The method according to claim 5 , wherein an average particle diameter of the ruthenium nanoparticles is 7 nm or less.

9. The ruthenium nanoparticles according to claim 1 , wherein an average particle diameter of the ruthenium nanoparticles is 2 nm or more.

10. The ruthenium nanoparticles according to claim 1 , wherein an average particle diameter of the ruthenium nanoparticles is 26 nm or more.

11. Ruthenium nanoparticles consisting essentially of a face-centered cubic structure, wherein the ruthenium nanoparticles consist of ruthenium, and wherein the ruthenium nanoparticles have an X-ray diffraction pattern that can only be fitted with a face-centered cubic lattice having a space group Fm-3m.

12. The ruthenium nanoparticles according to claim 11 , wherein an average particle diameter of the ruthenium nanoparticles is 7 nm or less.

13. The ruthenium nanoparticles according to claim 11 , wherein an average particle diameter of the ruthenium nanoparticles is 2 nm or more.

14. The ruthenium nanoparticles according to claim 11 , wherein an average particle diameter of the ruthenium nanoparticles is 2.6 nm or more.

15. A carbon monoxide oxidation catalyst comprising the ruthenium nanoparticles according to claim 11 .

16. Ruthenium nanoparticles consisting of a face-centered cubic structure, wherein the ruthenium nanoparticles consist of ruthenium.

17. The ruthenium nanoparticles according to claim 16 , wherein an average particle diameter of the ruthenium nanoparticles is 7 nm or less.

18. The ruthenium nanoparticles according to claim 16 , wherein an average particle diameter of the ruthenium nanoparticles is 2 nm or more.

19. The ruthenium nanoparticles according to claim 16 , wherein an average particle diameter of the ruthenium nanoparticles is 2.6 nm or more.

20. A carbon monoxide oxidation catalyst comprising the ruthenium nanoparticles according to claim 16 .

Assignees

• Kitagawa Hiroshi
• Kusada Kohei
• Japan Science & Tech Agency

Inventors

• Kitagawa Hiroshi
• Kusada Kohei

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/77

  Compounds characterised by their crystallite size · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title