Catalyst for oxidative dehydrogenation reaction, and method for producing same

Patent metadata

Field	Value
Publication number	US-11618012-B2
Application number	US-201916963639-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Nov 19, 2018
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

Provided is a catalyst for an oxidative dehydrogenation reaction that comprises: a porous support; a core portion supported on the porous support and containing a first zinc ferrite-based catalyst; and a shell portion supported on the core portion and containing a second zinc ferrite-based catalyst, in which the first zinc ferrite-based catalyst and the second zinc ferrite-based catalyst are different from each other.

First claim

The invention claimed is:

1. A catalyst for an oxidative dehydrogenation reaction, the catalyst comprising:
a core part comprising a porous support, and a first zinc ferrite-based catalyst supported on the porous support; and
a shell part comprising a second zinc ferrite-based catalyst supported on the core part,
wherein the first zinc ferrite-based catalyst and the second zinc ferrite-based catalyst are different from each other, and
wherein the first zinc ferrite-based catalyst has the following Formula 2 and the second zinc ferrite-based catalyst has the following Formula 3:
(R1) a Zn b Fe c O y   Formula 2

(R2) a′ Zn b′ Fe c′ O y′   Formula 3

wherein in Formulae 2 and 3:
R1 and R2 are each independently Cs, Ti, Zr, V, Nb, W, Cu, Ag, Cd, Sb, Ce, Cr, Mn, K, Co, or Mo, provided that R1 and R2 are different from each other;
y and y′ are each independently 1 to 6; and
a, b, c, a′, b′, and c′ are each independently more than 0 and 2.8 or less.

2. The catalyst of claim 1 , wherein a content of the first zinc ferrite-based catalyst is 5 wt % to 40 wt %, based on a total weight of the catalyst.

3. The catalyst of claim 1 , wherein a content of the second zinc ferrite-based catalyst is 0.1 wt % to 30 wt %, based on a total weight of the catalyst.

4. The catalyst of claim 1 , wherein a shape of the porous support comprises one or more shapes selected from the group consisting of a spherical shape, a cylindrical shape, a cyclic shape, and a plate shape.

5. The catalyst of claim 1 , wherein the porous support comprises one or more of alumina, silica, zirconia, silicon carbide, and cordierite.

6. A method for producing a catalyst for an oxidative dehydrogenation reaction, the method comprising:
forming a core part by supporting a first zinc ferrite-based catalyst on a porous support; and
forming a shell part by supporting a second zinc ferrite-based catalyst on the core part,
wherein the first zinc ferrite-based catalyst and the second zinc ferrite-based catalyst are different from each other, and wherein the first zinc ferrite-based catalyst has the following Formula 2 and the second zinc ferrite-based catalyst has the following Formula 3:
(R1) a Zn b Fe c O y   Formula 2

(R2) a′ Zn b′ Fe c′ O y′   Formula 3

wherein in Formulae 2 and 3:
R1 and R2 are each independently Cs, Ti, Zr, V, Nb, W, Cu, Ag, Cd, Sb, Ce, Cr, Mn, K, Co, or Mo, provided that R1 and R2 are different from each other;
y and y′ are each independently 1 to 6; and
a, b, c, a′, b′, and c′ are each independently more than 0 and 2.8 or less.

7. The method of claim 6 , wherein the forming of the core part by supporting the first zinc ferrite-based catalyst on the porous support comprises:
coating the inside and the entire outermost surface of the porous support with the first zinc ferrite-based catalyst.

8. The method of claim 7 , wherein the forming of the shell part by supporting the second zinc ferrite-based catalyst on the core part comprises:
removing the first zinc ferrite-based catalyst provided on the outermost surface of the porous support; and coating the outermost surface of the porous support with the second zinc ferrite-based catalyst.

9. The method of claim 8 , wherein the removing of the first zinc ferrite-based catalyst provided on the outermost surface of the porous support is performed until an amount of first zinc ferrite-based catalyst removed becomes 0.1 wt % to 5 wt % based on the total weight of the coated first zinc ferrite-based catalyst.

10. A method for producing butadiene, the method comprising:
preparing the catalyst for an oxidative dehydrogenation reaction of claim 1 ; and
producing butadiene using the catalyst for an oxidative dehydrogenation reaction in an oxidative dehydrogenation reaction of a butene by allowing a raw material comprising C4 fractions containing a butene, steam, oxygen (O 2 ), and nitrogen (N 2 ), to react at a reaction temperature of 250° C. to 500° C., a pressure of 0.1 bar to 10 bar, and a gas hourly space velocity (CHSV) of 100 h −1 to 400 h −1 .

Assignees

• Lg Chemical Ltd

Inventors

• Hwang Ye Seul
• Ko Dong Hyun
• Lee Joohyuck
• Suh Myungji

Classifications

• B01J35/398

  Egg yolk like · CPC title

• B01J35/53

  with a core-shell structure · CPC title

• Y02P20/50

  Improvements relating to the production of bulk chemicals · CPC title

• C07C5/48

  with oxygen as an acceptor · CPC title

• B01J37/03

  Precipitation; Co-precipitation · CPC title