Core-shell nanoparticle, method for manufacturing same and method for producing hydrogen peroxide using same

Patent metadata

Field	Value
Publication number	US-10987656-B2
Application number	US-201515508227-A
Country	US
Kind code	B2
Filing date	Jan 7, 2015
Priority date	Sep 3, 2014
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

This invention relates to core-shell nanoparticles having acid sites, a method of manufacturing the same, and a method of directly producing hydrogen peroxide using the same.

First claim

The invention claimed is:

1. A method of manufacturing a core-shell nanoparticle, comprising steps of:
(1) preparing a palladium nanoparticle have a particle size of 5-30 nm;
(2) dispersing the prepared palladium nanoparticle in a dispersion solvent, adding a base solution, and performing stirring;
(3) adding the solution stirred in the step (2) with a silica precursor and an alumina precursor, thus forming a shell consisting of silica-alumina composite on a surface of the palladium nanoparticle; and
(4) thermally treating the palladium nanoparticle having the shell consisting of silica-alumina composite formed on the surface thereof,
wherein the core-shell nanoparticle comprises:
a shell consisting of the a silica-alumina composite having both a Lewis acid site and a Bronsted acid site; and
a core including a palladium nanoparticle surrounded by the shell,
wherein the base solution is used in an amount of 5 to 10 vol % based on a total volume of the dispersion solvent,
wherein the alumina precursor is di-sec-butoxyaluminoxy-triethoxysilane,
the silica precursor and the alumina precursor mixed so that the silicon:aluminum molar ratio is 20 to 80.

2. The method of claim 1 , wherein the dispersion solvent includes at least one selected from the group consisting of an organic solvent and water, and
the organic solvent includes at least one selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, hexane, toluene, and benzene.

3. The method of claim 1 , wherein the silica precursor includes at least one selected from the group consisting of tetramethyl orthosilicate, tetraethyl orthosilicate, tetrapropyl orthosilicate, and tetrabutyl orthosilicate.

4. The method of claim 1 , wherein the thermally treating in the step (4) is performed at a temperature of 400 to 900° C. for 3 to 18 hr.

Assignees

• Univ Korea Res & Bus Found

Inventors

• Lee Kwan-Young
• Seo Myung-Gi
• Kim Seongmin
• Jeong Ha Eun

Classifications

• B01J2235/10

  Infrared [IR] · 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

• B01J35/45

  Nanoparticles · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/393

  Metal or metal oxide crystallite size · CPC title