Egg-shell type hybrid structure of highly dispersed nanoparticle-metal oxide support, preparation method thereof, and use thereof

Patent metadata

Field	Value
Publication number	US-10112172-B2
Application number	US-201515115302-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Oct 17, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

The present invention relates to an egg-shell type hybrid structure of highly dispersed nanoparticles-metal oxide support, a preparation method thereof, and a use thereof. Specifically, the present invention relates to an egg-shell type hybrid structure of highly dispersed nanoparticles-metal oxide support, providing an excellent platform in a size of nanometers or micrometers which can support nanoparticles selectively in the porous shell portion by employing a metal oxide support with an average diameter of nanometers or micrometers including a core of nonporous metal oxide and a shell of porous metal oxides, a preparation method thereof, and a use thereof.

First claim

The invention claimed is:

1. A method for preparing an egg-shell type hybrid structure, the egg-shell type hybrid structure comprising:
a metal oxide support with an average diameter of nanometers or micrometers comprising a core of nonporous metal oxide and a shell of porous metal oxides; and
nanoparticles, positioned inside the pores of the metal oxide support, thereby limiting a size of the nanoparticles to a size of the pores of the shell of the metal oxide support;
the method comprising:
preparing particles of nonporous metal oxides (Step 1);
coating pore-forming materials and precursors of metal oxides onto the surface of particles of the nonporous metal oxides, followed by thermal treatment to form a shell of porous metal oxides, thereby obtaining powder of a metal oxide support having a core-shell structure (Step 2);
grinding and mixing the powder of the metal oxide support of the core-shell structure and a metal-containing compound having a melting point lower than that of the metal oxide support, and subsequently melt-infiltrating the metal-containing compound into the pores of the surface of the metal oxide support at a temperature between the melting point of the metal-containing compound and 5° C. higher in a closed system (Step 3); and
calcining composite powder formed from melt infiltration (Step 4).

2. The method of claim 1 , wherein the egg-shell type hybrid structure is a catalyst in the form of an egg-shell and the nanoparticles are particles of a nano catalyst.

3. The method of claim 2 , wherein the catalyst is applied in a gaseous or liquid catalyst reaction.

4. The method of claim 2 , wherein metal oxides of the metal oxide support are silica, alumina, titanic, zirconia, or a combination thereof.

5. The method of claim 2 , wherein the particles of the nano catalyst are metal or metal oxides.

6. The method of claim 1 , wherein the egg-shell type hybrid structure is an electrode material in the form of an egg-shell; and the nanoparticles are particles of a nano electrode active material.

7. The method of claim 1 , wherein the egg-shell type hybrid structure is a sensor material in the form of an egg-shell; and the nanoparticles are particles of a nano sensor.

8. The method of claim 1 , wherein the egg-shell type hybrid structure is an adsorbent material in the form of an egg-shell; and the nanoparticles are particles of a nano adsorbent.

9. The method of claim 1 , wherein the metal oxide support forms the shell of porous metal oxides by coating pore-forming materials and precursors of metal oxides onto the surface of particles of nonporous metal oxides, followed by removal of the pore-forming materials via thermal treatment.

10. The method of claim 9 , wherein the pore-forming materials comprise a long carbon chain of C10 to C30.

11. The method of claim 1 , wherein metal oxides of the metal oxide support are silica, alumina, Mania, zirconia, or a combination thereof.

12. The method of claim 1 , wherein the nanoparticles are metals or metal oxides.

13. The method of claim 1 , wherein the metal-containing compound having a melting point lower than that of the metal oxide support is a metal hydrate salt.

14. The method of claim 1 , wherein the dispersibility and/or oxidation state of the nanoparticles of metal or metal oxides are regulated by regulating the calcination atmosphere.

15. The method of claim 1 , wherein the calcination is carried out in the atmosphere or under nitrogen atmosphere.

16. The method of claim 1 , wherein the calcination is carried out at a temperature range of 200° C. to 700° C.

17. The method of claim 1 , wherein an average diameter of the nanoparticles is 2 nm to 20 nm.

18. The method of claim 1 , wherein an average diameter of the hybrid structure may be 100 nm to 1000 nm.

19. The method of claim 1 , wherein the nanoparticles of metal or metal oxides are located into the pore of the shell of the metal oxide support by grinding powder of metal oxide support and a metal-containing compound having a melting point lower than that of the metal oxide support and mixing the same, and subsequently subjecting the metal-containing compound to melt infiltration into the pores of the surface of the metal oxide support at a temperature between the melting point of the metal-containing compound and 5° C. higher in a closed system, followed by calcining composite powder formed therefrom.

Assignees

• Korea Inst Energy Res

Inventors

• Park Ji Chan
• Yang Jung Il
• Jung Heon
• Lee Ho Tae
• Chun Dong Hyun
• Hong Sung Jun
• Kwon jae in

Classifications

• B01J37/0072

  Preparation of particles, e.g. dispersion of droplets in an oil bath · CPC title

• B01J37/082

  Decomposition and pyrolysis · CPC title

• B01J35/0013

  Operations & Transport · mapped topic

• B01J35/026

  Operations & Transport · mapped topic

• B01J21/08

  Silica · CPC title