Palladium-containing composition and hydrogen peroxide production method

Patent metadata

Field	Value
Publication number	US-12337304-B2
Application number	US-202318318157-A
Country	US
Kind code	B2
Filing date	May 16, 2023
Priority date	Sep 13, 2018
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

It is desired to develop a method of producing hydrogen peroxide, which is capable of producing hydrogen peroxide with high production efficiency. According to the present invention, provided is a palladium-containing composition comprising palladium particles and a coating agent that coats the surface of the palladium particles, wherein a compound having an O═X structure (wherein X represents any of a phosphorus atom, a sulfur atom, and a carbon atom) is comprised as the coating agent.

First claim

The invention claimed is:

1. A method of producing hydrogen peroxide, comprising:
producing a palladium-containing composition that comprises palladium particles and a coating agent that coats a surface of the palladium particles; and
reacting hydrogen with oxygen in a presence of the palladium-containing composition such that hydrogen peroxide is obtained,
wherein the coating agent comprises at least one compound selected from the group consisting of trans,trans-1,5-diphenyl-1,4-pentadien-3-one, and diphenyl sulfone.

2. The method of claim 1 , further comprising:
preparing a palladium-containing solution by mixing the palladium-containing composition with an organic solvent;
preparing a mixed solution by mixing the palladium-containing solution with water or an aqueous solution; and
supplying hydrogen and oxygen into the mixed solution such that hydrogen peroxide is generated.

3. The method of claim 2 , wherein the organic solvent is selected from the group consisting of toluene, butylbenzene, pseudocumene (1,2,4-trimethylbenzene), 1,3,4-trimethylbenzene, 1,2,5-trimethylbenzene, mesitylene (1,3,5-trimethylbenzene), tert-butylbenzene, and tert-butyltoluene, and
the preparing of the mixed solution comprises mixing the palladium-containing solution with a sodium bromide aqueous solution.

4. The method of claim 3 , wherein the organic solvent is toluene.

5. The method of claim 2 , wherein, in a reaction solution after the generation of hydrogen peroxide, the palladium particles are present in an organic layer and the hydrogen peroxide is present in a water layer.

6. The method of claim 2 , wherein the water or aqueous solution is an acid aqueous solution having a pH value of 0.5 to 2.0.

7. The method of claim 1 , wherein the reacting comprises no catalyst other than the palladium-containing composition.

8. The method of claim 1 , wherein the palladium particles are palladium colloidal particles having a specific mean particle diameter of 1 to 10 nm.

9. The method of claim 1 , wherein the palladium particles are palladium colloidal particles, and
the palladium-containing composition comprises the palladium colloidal particles uniformly dispersed in an organic solvent.

10. The method of claim 1 , wherein the palladium particles are palladium colloidal particles having a specific mean particle diameter of 1 to 10 nm, and
the palladium-containing composition comprises the palladium colloidal particles uniformly dispersed in an organic solvent.

11. The method of claim 1 , further comprising:
preparing a palladium-containing solution by mixing the palladium-containing composition with an organic solvent;
preparing a mixed solution by mixing the palladium-containing solution with water or an aqueous solution before adding hydrogen and oxygen; and
supplying hydrogen and oxygen into the mixed solution such that hydrogen peroxide is generated.

12. The method of claim 11 , wherein the mixed solution comprises palladium colloidal particles having a specific mean particle diameter of 1 to 10 nm and uniformly dispersed in the organic solvent.

13. The method of claim 1 , wherein the producing the palladium-containing composition comprises mixing the palladium particles with the coating agent to form a mixture and stirring the mixture in a presence of an organic solvent.

Assignees

• Mitsubishi Gas Chemical Co
• Univ Kyushu Nat Univ Corp

Inventors

• Ishihara Tatsumi
• Okuda Norikazu
• Kimizuka Ken-Ichi
• Tasaki Ken

Classifications

• B01J35/00

  Catalysts, in general, characterised by their form or physical properties · CPC title

• B01J35/30

  characterised by their physical properties · CPC title

• B01J21/18

  Carbon · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/23

  in a colloidal state · CPC title