Method for preparing catalyst

Patent metadata

Field	Value
Publication number	US-10058857-B2
Application number	US-201515532929-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 18, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

[Problem to be Solved]
To provide a method for preparing a catalyst that has high activity and exhibits high durability with reduced elution of a catalyst metal when a liquid-phase oxidation reaction is brought about without combined use of an alkali; and a method for producing an oxide highly efficiently by use of the catalyst.
The method for preparing a catalyst has the following Steps 1, 2 and 3.
Step 1: preparing an aqueous dispersion of a catalyst carrying Pt on activated carbon;
Step 2: preparing an aqueous solution containing Bi in an ionic state; and
Step 3: adding the aqueous dispersion obtained in Step 1 to the aqueous solution obtained in Step 2.

First claim

The invention claimed is:

1. A method for preparing a catalyst, comprising the following Steps 1, 2 and 3,
Step 1: preparing an aqueous dispersion of a catalyst carrying Pt on activated carbon;
Step 2: preparing an aqueous solution containing Bi in an ionic state; and
Step 3: adding the aqueous dispersion obtained in Step 1 to the aqueous solution obtained in Step 2.

2. The method for preparing a catalyst according to claim 1 , wherein Step 3 is conducted under a reducing atmosphere.

3. The method for preparing a catalyst according to claim 1 , wherein the aqueous solution obtained in Step 2 contains an acid.

4. The method for preparing a catalyst according to claim 3 , wherein the acid is one selected from acetic acid and nitric acid.

5. The method for preparing a catalyst according to claim 1 , wherein the addition in Step 3 is conducted by continuous addition or divided addition.

6. The method for preparing a catalyst according to claim 1 , wherein the Bi aqueous solution receiving the addition in Step 3 has a temperature of from 10° C. to 60° C.

7. The method for preparing a catalyst according to claim 1 , wherein, in Step 3, the addition of the aqueous dispersion of the catalyst carrying Pt on activated carbon is conducted at a rate of from 1 mL/min. to 10 mL/min.

8. The method for preparing a catalyst according to claim 1 , wherein, in Step 3, a time period required for the addition is from 15 minutes to 10 hours.

9. The method for preparing a catalyst according to claim 1 , wherein the aqueous dispersion has a concentration of the catalyst carrying Pt on activated carbon of from 4% by mass to 12% by mass.

10. The method for preparing a catalyst according to claim 3 , wherein the acid to be used is present in the Bi aqueous solution in an amount of from 1% by mass to 5% by mass.

11. The method for preparing a catalyst according to claim 1 , wherein Bi is blended in the Bi aqueous solution in an amount of from 0.0001 M to 0.1 M.

12. The method for preparing a catalyst according to claim 1 , wherein an ion source for Bi ion is at least one selected from bismuth nitrate pentahydrate, bismuth oxide, bismuth carbonate, and bismuth hydroxide.

13. A catalyst obtained by the preparation method according to claim 1 .

14. A catalyst according to claim 13 , wherein, in a photoelectron spectrum of a Bi4f orbital measured by XPS, a peak top binding energy value in a binding energy range between 162 and 155 eV is 158.5 eV or lower and 157.0 eV or higher.

15. A method for preparing an oxide of alcohol or an oxide of polyoxyalkylene alkyl ether, comprising: feeding, in the presence of the catalyst according to claim 13 , oxygen to a composition containing alcohol or polyoxyalkylene alkyl ether, and water; and oxidizing by dehydrogenation the alcohol or the polyoxyalkylene alkyl ether.

16. The method for producing an oxide according to claim 15 , wherein the alcohol or the polyoxyalkylene alkyl ether is one, or two or more kinds represented by the following general formula (1) or general formula (2),
R 1 O—H  (1)

in the general formula (1), R 1 is an aliphatic hydrocarbon group having a carbon number of from 2 to 40,
R 2 O-(AO) n —H  (2)

in the general formula (2), R 2 is a hydrocarbon group having a carbon number of from 2 to 40; AO denotes an alkyleneoxy group having a carbon number of from 2 to 4; and n denotes a number of moles added of the alkyleneoxy group and is an integer of from 1 to 30.

Assignees

• Kao Corp

Inventors

• Nomura Yukiko

Classifications

• B01J37/02

  Impregnation, coating or precipitation ({B01J37/0009 and B01J37/0018 take precedence } ; protection by coating B01J33/00) · CPC title

• B01J37/009

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

• C07C51/235

  of —CHO groups or primary alcohol groups · CPC title

• B01J35/0013

  Operations & Transport · mapped topic

• B01J21/18

  Carbon · CPC title