Catalyst with a core-shell structure for methane oxidation, method of preparing the same and method of oxidizing methane using the same

Patent metadata

Field	Value
Publication number	US-12109552-B2
Application number	US-201917281773-A
Country	US
Kind code	B2
Filing date	Jul 26, 2019
Priority date	Oct 4, 2018
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

A catalyst with a core-shell structure for methane oxidation, a method of preparing the catalyst, and a method of methane oxidation using the catalyst are disclosed. The catalyst includes a core structure consisting of a nano-support and core nanoparticles; and a shell coating layer coated on the core structure in which the core nanoparticles have a particle diameter smaller than that of the nano-support and are coated on the nano-support to form a core structure. The catalyst has excellent thermal stability during methane oxidation reaction at high temperature and an effect of increasing methane conversion and formaldehyde selectivity.

First claim

The invention claimed is:

1. A catalyst for methane oxidation comprising:
a core structure consisting of a nano-support comprising SiO 2 and core nanoparticles comprising V 2 O 5 ; and
a shell coating layer comprising Al 2 O 3 coated on the core structure,
wherein the core nanoparticles have a particle diameter smaller than that of the nano-support and are coated on the nano-support to form a core structure.

2. The catalyst for methane oxidation of claim 1 , wherein the SiO 2 is a spherical SiO 2 .

3. The catalyst for methane oxidation of claim 1 , wherein the V 2 O 5 has an average particle size of 10 to 100 nm.

4. A method of preparing the catalyst for methane oxidation of claim 1 comprising:
preparing a nano-support comprising SiO 2 ;
preparing a core structure by hydrothermal reaction of V 2 O 5 nanoparticles on the nano-support; and
forming a core-shell nanostructure by atomic layer deposition of Al 2 O 3 on the core structure.

5. The method of preparing the catalyst for methane oxidation of claim 4 , wherein the nano-support is spherical nano-support.

6. The method of preparing a catalyst for methane oxidation of claim 4 , wherein the hydrothermal reaction is performed at 100 to 250° C. for 5 to 30 hours.

7. The method of preparing a catalyst for methane oxidation of claim 4 , wherein the atomic layer deposition is performed for 1 to 100 cycles using trimethylaluminum and H 2 O.

8. A catalyst for methane oxidation, which is prepared by the method of preparing the catalyst for methane oxidation of claim 4 .

9. A method of methane oxidation, comprising reacting methane and oxygen in the presence of the catalyst for methane oxidation of claim 1 .

10. A method of methane oxidation for producing formaldehyde comprising producing formaldehyde by reacting methane and oxygen at 500 to 800° C. in the presence of the catalyst for methane oxidation of claim 1 .

11. A method of methane oxidation, comprising reacting methane and oxygen in the presence of the catalyst for methane oxidation of claim 8 .

12. A method of methane oxidation for producing formaldehyde comprising producing formaldehyde by reacting methane and oxygen at 500 to 800° C. in the presence of the catalyst for methane oxidation of claim 8 .

13. The catalyst for methane oxidation of claim 1 , wherein the catalyst has a SiO 2 @V 2 O 5 @Al 2 O 3 -(x) (x=10, 30, 40, 50, 70, and 100) core@shell nanostructure.

14. The catalyst for methane oxidation of claim 1 , wherein the catalyst has a SiO 2 @V 2 O 5 @Al 2 O 3 -(x) (x=40−70) core@shell nanostructure.

15. The catalyst for methane oxidation of claim 1 , wherein the catalyst has a SiO 2 @V 2 O 5 @Al 2 O 3 -(x) (x=40, 50, 70) core@shell nanostructure.

Assignees

• Ajou Univ Industry—Academic Cooperation Foundation
• Ulsan Nat Inst Science & Tech Unist
• Univ Ajou Ind Academic Coop Found

Inventors

• An Kwang Jin
• Park Eun Duck
• Yang Eui Seob

Classifications

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J35/53

  with a core-shell structure · CPC title

• B01J23/22 Primary

  Vanadium · CPC title

• B01J21/04 Primary

  Alumina · CPC title

• B01J2235/15

  X-ray diffraction · CPC title