Method of forming a catalyst with an atomic layer of platinum atoms

Patent metadata

Field	Value
Publication number	US-9610566-B2
Application number	US-201114000636-A
Country	US
Kind code	B2
Filing date	Feb 22, 2011
Priority date	Feb 22, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A method of forming a catalyst material includes hindering the reaction rate of a displacement reaction and controlling the formation of platinum clusters, where an atomic layer of metal atoms is displaced with platinum atoms, to produce a catalyst material that includes an atomic layer of the platinum atoms.

First claim

What is claimed is:

1. A method of forming a catalyst material, the method comprising:
hindering the reaction rate of a displacement reaction to control the formation of platinum clusters, wherein an atomic layer of metal atoms is displaced with platinum atoms, to produce a catalyst material that includes an atomic layer of the platinum atoms, wherein the hindering includes:
A) conducting the displacement reaction in the presence of a platinum coordinating compound; and
B) forming a coordination complex with the platinum coordinating compound and: i) a platinum salt; or ii) the atomic layer of platinum atoms during the displacement reaction, thereby hindering displacement of the metal atoms with the platinum atoms.

2. The method as recited in claim 1 , wherein the metal atoms comprise copper.

3. The method as recited in claim 1 , wherein the platinum coordinating compound is citric acid.

4. The method as recited in claim 1 , wherein the platinum coordinating compound is ethylenediamine tetraacetic acid (EDTA).

5. The method as recited in claim 1 , wherein the atomic layer of metal atoms is on a noble metal core.

6. A method of forming a catalyst material, the method comprising:
displacing an atomic layer of metal atoms with platinum atoms in the presence of a platinum-coordinating compound to produce a catalyst material that includes an atomic layer of the platinum atoms, the method further comprising forming a coordination complex with the platinum coordinating compound and: i) a platinum salt; or ii) the atomic layer of platinum atoms during displacement of the atomic layer of metal atoms.

7. The method as recited in claim 6 , wherein the platinum-coordinating compound is selected from a group consisting of citric acid, EDTA and mixtures thereof.

8. The method as recited in claim 6 , wherein the platinum-coordinating compound is in solution with an acid and the platinum salt.

9. A method of forming a catalyst material, the method comprising:
providing a particle that includes a metal core that is covered with an atomic layer of metal atoms;
providing a solution that includes a platinum-coordinating compound and a platinum salt;
treating the particle with the solution to thereby displace the metal atoms with platinum atoms and produce a catalyst material that includes the metal core covered with an atomic layer of the platinum atoms; and
hindering displacement of the metal atoms with the platinum atoms by forming a coordination complex with the platinum coordinating compound and: i) the platinum salt; or ii) the atomic layer of platinum atoms during displacement of the metal atoms.

10. The method as recited in claim 9 , further comprising depositing the atomic layer of metal atoms onto the metal core using underpotential deposition (UPD).

11. The method as recited in claim 9 , wherein the platinum-coordinating compound is selected from a group consisting of citric acid, EDTA and mixtures thereof.

12. The method as recited in claim 9 , wherein the treating of the particle with the solution includes mixing the particle with the solution.

Assignees

• Shao Minhua
• Humbert Michael Paul
• Kaneko Keiichi
• Toyota Motor Co Ltd
• Audi Ag

Inventors

• Shao Minhua
• Humbert Michael Paul
• Kaneko Keiichi

Classifications

• H01M4/926

  on carbon or graphite · CPC title

• B01J21/08

  Silica · CPC title

• B01J37/343

  of ultrasonic wave energy · CPC title

• H01M4/8657

  layered · CPC title

• B01J37/0018

  Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat) · CPC title