Nanocatalyst with mesoporous shell for hydrogen peroxide production and methodfor hydrogen peroxide production using the same

Patent metadata

Field	Value
Publication number	US-2018056277-A1
Application number	US-201615365012-A
Country	US
Kind code	A1
Filing date	Nov 30, 2016
Priority date	Aug 30, 2016
Publication date	Mar 1, 2018
Grant date	—

Abstract

Disclosed is a core-shell structured nanocatalyst for hydrogen peroxide production. The core-shell structured nanocatalyst includes a core composed of spherical silica immobilized with noble metal nanoparticles and a mesoporous shell surrounding the core. The use of the nanocatalyst with a mesoporous shell for the production of hydrogen peroxide from hydrogen and oxygen ensures high hydrogen conversion and hydrogen peroxide production rate compared to the use of conventional nanoparticle catalysts with a microporous shell. Also disclosed is a method for hydrogen peroxide production using the nanocatalyst.

First claim

What is claimed is:

1 . A core-shell nanoparticle catalyst for hydrogen peroxide production comprising a silica nanoparticle core immobilized with noble metal nanoparticles and a mesoporous shell.

2 . The core-shell nanoparticle catalyst according to claim 1 , wherein the noble metal is selected from palladium (Pd), gold, (Au), platinum (Pt), and alloys thereof.

3 . The core-shell nanoparticle catalyst according to claim 1 , wherein the noble metal nanoparticles have a size of 1 to 30 nm.

4 . The core-shell nanoparticle catalyst according to claim 1 , wherein the core-shell nanoparticles are supported on silica (SiO 2 ), titania (TiO 2 ), alumina (Al 2 O 3 ), zirconia (ZrO 2 ), carbon (C), and composites thereof.

5 . The core-shell nanoparticle catalyst according to claim 1 , wherein the mesoporous shell has a thickness of 5 to 40 nm.

6 . A method for preparing a core-shell nanoparticle catalyst for hydrogen peroxide production, the method comprising (1) preparing noble metal nanoparticles, (2) immobilizing the noble metal nanoparticles on silica, and (3) coating a mesoporous shell on the silica immobilized with the noble metal nanoparticles.

7 . A method for hydrogen peroxide production comprising feeding hydrogen and oxygen to a reactor where the hydrogen reacts with the oxygen in the presence of the core-shell nanoparticle catalyst according to claim 1 in a solvent.

8 . The method according to claim 7 , wherein the solvent is selected from the group consisting of methanol, ethanol, water, and mixtures thereof.

9 . The method according to claim 7 , wherein the solvent comprises halogen anions selected from the group consisting of fluorine, chlorine, bromine, and iodine anions.

10 . The method according to claim 7 , wherein the solvent further comprises at least one acid selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid.

11 . The method according to claim 7 , wherein the molar ratio of the hydrogen to the oxygen is between 1:5 and 1:15.

12 . The method according to claim 7 , wherein the reaction is carried out at a pressure of 1 to 40 atm and a temperature of 10 to 30° C.

Assignees

• Univ Korea Res & Bus Found
• Korea Inst Sci & Tech

Inventors

• Lee Kwan Young
• Seo Myung Gi
• Han Sang Soo
• Kim Ho Joong
• Jo Deok Yeon
• Cho Young Hoon

Classifications

• B01J23/44 Primary

  Palladium · CPC title

• C01B15/029

  Preparation from hydrogen and oxygen · CPC title

• B01J2229/32

  Reaction with silicon compounds, e.g. TEOS, siliconfluoride · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/45

  Nanoparticles · CPC title