Catalyst carrier, method for producing catalyst carrier, and use of catalyst carrier

Patent metadata

Field	Value
Publication number	US-10096841-B2
Application number	US-201515537907-A
Country	US
Kind code	B2
Filing date	Dec 24, 2015
Priority date	Dec 25, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A catalyst carrier, an electrode catalyst, an electrode including the catalyst, a membrane electrode assembly including the electrode, a fuel cell including the membrane electrode assembly, and a method for producing the catalyst carrier. The catalyst carrier includes a carbon material having a chain structure including a chain of carbon particles. The catalyst carrier contains a titanium compound-carbon composite particle in which carbon encloses a titanium compound particle. The molar ratios of a carbon element, a nitrogen element, and an oxygen element to a titanium element taken as 1 in the catalyst carrier are more than 0 and 50 or less, more than 0 and 2 or less, and more than 0 and 3 or less, respectively.

First claim

The invention claimed is:

1. A catalyst carrier comprising a carbon material having a chain structure including a chain of carbon particles,
wherein the catalyst carrier contains a titanium compound-carbon composite particle in which carbon encloses a titanium compound particle, and
the number of moles of a carbon element, a nitrogen element, and an oxygen element relative to the number of moles of a titanium element in the catalyst carrier are more than 0 and 50 or less, more than 0 and 2 or less, and more than 0 and 3 or less, respectively.

2. The catalyst carrier according to claim 1 , wherein the catalyst carrier has a dibutyl phthalate absorption of 150 to 450 mL/100 g.

3. The catalyst carrier according to claim 1 , wherein a content of the titanium compound particle is 10 to 90 mass %.

4. The catalyst carrier according to claim 1 , wherein the catalyst carrier has a BET specific surface area of 450 to 1100 m 2 /g.

5. The catalyst carrier according to claim 1 , wherein the titanium compound particle has an average particle size of 5 to 300 nm.

6. The catalyst carrier according to claim 1 , wherein the carbon that encloses the titanium compound particle in the titanium compound-carbon composite particle is at least one carbon selected from amorphous carbon and graphitized carbon.

7. The catalyst carrier according to claim 1 , wherein the carbon material is one selected from the group consisting of carbon black, graphitized carbon black, graphite, and porous carbon.

8. The catalyst carrier according to claim 1 , wherein the carbon material is a mixture of two or more selected from the group consisting of carbon black, graphitized carbon black, graphite, and porous carbon.

9. The catalyst carrier according to claim 1 , wherein the carbon material has a primary particle size of 5 to 300 nm.

10. An electrode catalyst in which a catalyst metal particle is supported on the catalyst carrier according to claim 1 .

11. The electrode catalyst according to claim 10 , wherein a metal of the catalyst metal particle is at least one metal selected from the group consisting of platinum, palladium, ruthenium, gold, rhodium, iridium, osmium, iron, cobalt, nickel, chromium, zinc, and tantalum, or an alloy formed of at least two metals selected from the foregoing group.

12. The electrode catalyst according to claim 10 , wherein the electrode catalyst has a BET specific surface area of 200 to 800 m 2 /g.

13. An electrode comprising an electrode substrate and a catalyst layer containing the electrode catalyst according to claim 10 , the catalyst layer being formed on the electrode substrate.

14. A membrane electrode assembly comprising a cathode and an anode with an electrolyte membrane disposed therebetween,
wherein at least one of the cathode and the anode is the electrode according to claim 13 .

15. A fuel cell comprising the membrane electrode assembly according to claim 14 .

16. A method for producing the catalyst carrier according to claim 1 , the method comprising:
a step of mixing a carbon material having a chain structure including a chain of carbon particles and a titanium compound-carbon composite particle in which carbon encloses a titanium compound particle,
wherein the number of moles of a carbon element, a nitrogen element, and an oxygen element relative to the number of moles of a titanium element in the titanium compound-carbon composite particle are more than 0 and 7 or less, more than 0 and 2 or less, and more than 0 and 3 or less, respectively.

17. The method for producing a catalyst carrier according to claim 16 , wherein 0.1 to 10 parts by mass of the carbon material is mixed with 1 part by mass of the titanium compound-carbon composite particle.

18. The method for producing a catalyst carrier according to claim 16 , wherein the carbon material has a BET specific surface area of 700 to 1400 m 2 /g.

19. The method for producing a catalyst carrier according to claim 16 , wherein the carbon material has a dibutyl phthalate absorption of 350 to 550 mL/100 g.

20. The method for producing a catalyst carrier according to claim 16 , wherein the carbon material has a crystallite size of 0.6 to 2.0 nm.

21. The method for producing a catalyst carrier according to claim 16 , wherein the carbon material is a mixture of a carbon material X having a BET specific surface area of 700 to 1400 m 2 /g and a carbon material Y having a BET specific surface area of 100 to 500 m 2 /g.

22. The method for producing a catalyst carrier according to claim 21 , wherein the carbon material Y has a primary particle size of 5 to 300 nm and a crystallite size of 2.0 to 5.0 nm.

23. The method for producing a catalyst carrier according to claim 16 , wherein the titanium compound-carbon composite particle is obtained by mixing polyvinylpyrrolidone and at least one compound selected from titanium oxycarbonitride, titanium oxynitride, and titanium oxide and heat-treating the mixture in a non-oxidizing gas atmosphere at 500° C. to 1100° C.

24. The method for producing a catalyst carrier according to claim 16 , wherein the titanium compound particle has a BET specific surface area of 50 to 300 m 2 /g.

Assignees

• Showa Denko Kk

Inventors

• Lee Kunchan
• Takahashi Hiroshi
• Kitagawa Tomoya

Classifications

• B01J23/8913

  Cobalt and noble metals · CPC title

• B01J37/16

  Reducing · CPC title

• B01J21/18

  Carbon · CPC title

• B01J37/04

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

• B01J37/08

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