Preparation method for rod-shaped molybdenum oxide and preparation method for molybdenum oxide composite

Patent metadata

Field	Value
Publication number	US-2017216819-A1
Application number	US-201515328991-A
Country	US
Kind code	A1
Filing date	Aug 28, 2015
Priority date	Aug 29, 2014
Publication date	Aug 3, 2017
Grant date	—

Abstract

The present specification relates to a preparation method for rod-shaped molybdenum oxide and a preparation method for a molybdenum oxide composite, the preparation method for rod-shaped molybdenum oxide according to the present invention may be carried out under low temperature and pressure conditions, and thus has an advantage in that it is possible to mass produce rod-shaped molybdenum oxide, and the preparation method for a molybdenum oxide composite according to the present invention has an advantage in that the molybdenum oxide composite may be synthesized at a temperature which is equal to or less than the boiling point of ethanol, and the amount of an ethanol solvent used is reduced.

First claim

1 . A preparation method for rod-shaped molybdenum oxide, the method comprising:
(A) mixing a hydrogen peroxide solution and molybdenum oxide powder and warming the mixture from 20° C. to 30° C. to 95° C. or less to form MoO2(OH)(OOH); and (B) forming rod-shaped molybdenum oxide from the MoO2(OH)(OOH) through a hydrothermal synthesis method.

2 . The method of claim 1 , wherein the warming of the mixture is carried out at a rate of 4° C./min to 5° C./min from 20° C. to 30° C. to 95° C. or less.

3 . The method of claim 1 , wherein Step (A) comprises separating a reaction product MoO2(OH)(OOH).

4 . The method of claim 1 , wherein Step (A) is carried out under a normal pressure condition.

5 . The method of claim 1 , wherein Step (B) comprises warming the mixture from normal temperature to a temperature of 130° C. to 160° C.

6 . The method of claim 1 , wherein Step (B) is carried out under a pressure condition in a range of 10 atm to 20 atm, and an internal pressure in a hydrothermal synthesis container is measured as the pressure.

7 . A preparation method for a molybdenum oxide composite, the method comprising:
(A) mixing a hydrogen peroxide solution and molybdenum oxide powder and warming the mixture from 20° C. to 30° C. to 95° C. or less to form MoO2(OH)(OOH); (B) forming rod-shaped molybdenum oxide from the MoO2(OH)(OOH) through a hydrothermal synthesis method; and (C) mixing the rod-shaped molybdenum oxide and a bismuth precursor to form a composite in which bismuth molybdate islands are provided on the rod-shaped molybdenum oxide.

8 . The method of claim 7 , wherein the bismuth precursor comprises bismuth nitrate (Bi(NO3)3.5H2O).

9 . The method of claim 7 , wherein Step (C) comprises mixing a) a solution comprising rod-shaped molybdenum oxide and b) a solution comprising a bismuth precursor, and then adding dropwise water thereto.

10 . The method of claim 9 , wherein a) the solution comprising rod-shaped molybdenum oxide comprises a solvent having an OH functional group and glycerol.

11 . The method of claim 9 , wherein b) the solution comprising the bismuth precursor comprises a solvent having an OH functional group.

12 . The method of claim 9 , wherein the adding dropwise of the water thereto is carried out at a rate of 4 ml/min to 5 ml/min.

13 . The method of claim 7 , wherein Step (C) is carried out at a temperature which is equal to or less than a boiling point of ethanol.

14 . The method of claim 7 , wherein the method comprises, after Step (C), (D) separating the molybdenum oxide composite.

15 . Rod-shaped molybdenum oxide prepared according to claim 1 .

16 . A molybdenum oxide composite prepared according to claim 7 .

17 . A catalyst comprising the rod-shaped molybdenum oxide of claim 15 .

18 . A catalyst support comprising the rod-shaped molybdenum oxide of claim 15 .

19 . A catalyst comprising the molybdenum oxide composite of claim 16 .

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/55

  Cylinders or rings · 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

• B01J23/31 Primary

  combined with bismuth · CPC title