Catalyst and use of same

Patent metadata

Field	Value
Publication number	US-2019134609-A1
Application number	US-201716082489-A
Country	US
Kind code	A1
Filing date	Mar 2, 2017
Priority date	Mar 8, 2016
Publication date	May 9, 2019
Grant date	—

Abstract

A catalyst comprising: a titanium oxide having an anatase-type crystal structure, and having the vertices and the ridge lines, wherein in a single titanium oxide particle, a vertex density per unit surface area is 8.0×10−4 nm−2 or more, and a ridge line density per unit surface area is 5.0×10−2 nm or more, or a ridge line density per unit volume is 8.0×10−3 nm−2 or more. A complex comprising: a material having a porous structure; and said catalyst. A membrane electrode assembly comprising: an anode; cathode; and an electrolyte membrane, wherein the cathode carries said catalyst on at least a surface of the cathode.

First claim

1 . A catalyst comprising:
a titanium oxide having an anatase-type crystal structure and having the vertices and the ridge lines, wherein in a single titanium oxide particle, a vertex density per unit surface area is 8.0×10 −4 nm −2 or more, or a vertex density per unit volume is 7.0×10 −4 nm −3 or more, and a ridge line density per unit surface area is 5.0×10 −2 nm −1 or more, or a ridge line density per unit volume is 8.0×10 −3 nm −2 or more.

2 . The catalyst according to claim 1 ,
wherein, in the single titanium oxide particle, the vertex density per unit surface area is 2.0×10 −3 nm −2 or more, or the vertex density per unit volume is 1.0×10 −3 nm −3 or more, and the ridge line density per unit surface area is 6.2×10 −2 nm −1 or more, or the ridge line density per unit volume is 1.3×10 −2 nm −2 or more.

3 . The catalyst according to claim 1 , further comprising:
a composite oxide obtained by substituting a part of titanium in the titanium oxide with at least one selected from the group consisting of a metal element other than titanium, an element belonging to the carbon group, an element belonging to the nitrogen group, and an element belonging to the oxygen group other than oxygen.

4 . The catalyst according to claim 3 ,
wherein the metal element other than titanium is an element belonging to Group 3, Group 4, or Group 5 of the periodic table.

5 . The catalyst according to claim 4 ,
wherein the element belonging to Group 4 of the periodic table is zirconium or hafnium.

6 . The catalyst according to claim 4 ,
wherein the element belonging to Group 5 of the periodic table is niobium or tantalum.

7 . The catalyst according to claim 1 which is for alcohol synthesis.

8 . A complex comprising:
a material having a porous structure; and the catalyst according to claim 1 .

9 . The complex according to claim 8 wherein the material has a porous structure having conductivity.

10 . The cathode according to claim 9 ,
wherein the porous structure is a mesh structure or a three-dimensional network structure.

11 . A membrane electrode assembly comprising:
an anode; a cathode; and an electrolyte membrane wherein the cathode carries the catalyst according to claim 1 on at least a surface of the cathode.

12 - 21 . (canceled)

Assignees

• Japan Science & Tech Agency

Inventors

• Yamauchi Miho
• Sadakiyo Masaaki
• Kitano Sho
• Hata Shinichi

Classifications

• B01J23/20 Primary

  Vanadium, niobium or tantalum · CPC title

• B01J2523/49

  Hafnium · CPC title

• B01J2523/57

  Tantalum · CPC title

• B01J2523/47

  Titanium · CPC title

• B01J2523/56

  Niobium · CPC title