Molybdenum oxide composite and preparation method therefor

Patent metadata

Field	Value
Publication number	US-10675612-B2
Application number	US-201515510170-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Oct 1, 2014
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

According to the present invention, a composite including amorphous iron molybdate islands, shows a smaller island size and a uniform distribution of islands compared with a conventional composite including crystalline islands, and thus has a higher specific surface area, thereby exhibiting excellent activity as a catalyst.

First claim

The invention claimed is:

1. A composite including a rod-shaped molybdenum oxide and amorphous iron molybdate islands provided on the rod-shaped molybdenum oxide,
wherein a ratio of respective particle numbers constituting the rod-shaped molybdenum oxide and the islands in the composite is in a range of 30:1 to 60:1,
wherein a mass ratio of molybdenum (Mo) to iron (Fe) included in the amorphous iron molybdate islands on the rod-shaped molybdenum oxide in the composite is in a range of 1:35 to 1:47, and
wherein the amorphous iron molybdate islands comprises 50% or more of an amorphous form and a remainder of a crystalline form.

2. The composite of claim 1 , wherein the iron molybdate island includes a material represented by Fe 2 Mo 3 O 12 .

3. The composite of claim 1 , wherein the content of islands is 10 wt % or less with respect to the entire composite.

4. The composite of claim 1 , wherein 20 to 100 islands per one rod-shaped molybdenum oxide are included.

5. The composite of claim 1 , wherein the size of the island is in a range of 10 nm to 50 nm.

6. The composite of claim 1 , wherein a specific surface area of the composite is in a range of 8 m 2 /g to 12 m 2 /g.

7. A preparation method of the composite of claim 1 , the method comprising:
(a) preparing a mixed solution of an iron precursor and a solvent;
(b) preparing a mixed solution of rod-shaped molybdenum oxide and a solvent; and
(c) mixing the solution of (a) and the solution of (b),
wherein step (b) includes heating a mixed solution of the rod-shaped molybdenum oxide and a solvent, and
wherein the heating is performed from room temperature to a range of 40° C. to 50° C.

8. The preparation method of claim 7 , wherein the preparation method of the composite is performed by a gram scale.

9. The preparation method of claim 7 , wherein the iron precursor is a material represented by Fe(NO 3 ) 3 9H 2 O, Fe(NO 3 ) 3 , Fe(OH) 3 or Fe 2 O 3 .

10. The preparation method of claim 7 , wherein step (a) includes stirring a mixed solution of the iron precursor and a solvent.

11. The preparation method of claim 7 , wherein step (b) includes stirring while or after heating the mixed solution of the rod-shaped molybdenum oxide and the solvent.

12. The preparation method of claim 7 , wherein step (c) includes dropping the solution of (a) in the solution of (b) at a constant speed.

13. The preparation method of claim 7 , further comprising:
isolating the composite of the iron molybdenum and the rod-shaped molybdenum oxide generated in step (c) after step (c).

14. The preparation method of claim 7 , further comprising:
(d) firing after step (c).

15. The preparation method of claim 14 , wherein the firing is performed at a temperature range of 500° C. to 700° C.

16. A catalyst including the composite of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Song Cheolock
• Hwang Gyo Hyun
• Cho Ara
• Bang Jungup

Classifications

• B01J35/1014

  Operations & Transport · mapped topic

• B01J37/009

  Preparation by separation, e.g. by filtration, decantation, screening · CPC title

• C07C2523/745

  Iron · CPC title

• C07C2523/28

  Molybdenum · CPC title

• B01J35/0006

  Operations & Transport · mapped topic