Photocatalyst material

Patent metadata

Field	Value
Publication number	US-10576459-B2
Application number	US-201414892251-A
Country	US
Kind code	B2
Filing date	Aug 6, 2014
Priority date	Aug 22, 2013
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A photocatalyst material (1A) in accordance with an aspect of the present invention includes a core particle (2) and a shell layer (3) with which a whole surface of the core particle (2) is covered. The core particle (2) contains at least a tungsten oxide, and the shell layer (3) is constituted by a titanium oxide.

First claim

The invention claimed is:

1. A visible light response type photocatalyst material comprising:
a core particle; and
a shell layer with which a whole surface of the core particle is fully covered,
the core particle containing at least a tungsten oxide, and
the shell layer being constituted by a titanium oxide, wherein
the visible light response type photocatalyst material undergoes photocatalytic activity when irradiated with visible light,
a weight proportion of the shell layer to the core particle is 0.4 or greater and 0.9 or less.

2. The visible light response type photocatalyst material as set forth in claim 1 , wherein:
the shell layer is constituted by a crystalline titanium oxide.

3. The visible light response type photocatalyst material as set forth in claim 1 , wherein: a metal or a metal compound containing at least one of copper, platinum, palladium, iron, silver, gold, nickel, ruthenium, iridium, niobium, and molybdenum is provided on a surface of the shell layer.

4. The visible light response type photocatalyst material as set forth in claim 3 , wherein: an amount of a metal contained in the metal or in the metal compound is 0.01 wt % or greater and 3 wt % or less with respect to the tungsten oxide contained in the core particle.

5. The visible light response type photocatalyst material as set forth in claim 1 , wherein: the core particle contains a mixture of a tungsten oxide and a copper oxide.

6. The visible light response type photocatalyst material as set forth in claim 5 wherein: an amount of the copper oxide contained in the core particle is greater than 0.01 wt % and less than 100 wt % with respect to the tungsten oxide contained in the core particle.

7. A method of producing a visible light response type photocatalyst material,
said visible light response type photocatalyst material comprising:
a core particle; and
a shell layer with which a whole surface of the core particle is fully covered, said method comprising:
growing, by adding a solution containing a titanium oxide precursor to a solution in which at least tungsten oxide particles each serving as the core particle are dispersed, a titanium oxide layer on a whole surface of at least one of the tungsten oxide particles, wherein

the visible light response type photocatalyst material undergoes photocatalytic activity when irradiated with visible light,
a weight proportion of the shell layer to the core particle is 0.4 or greater and 0.9 or less.

Assignees

• Sharp Kk

Inventors

• Okazaki Shinya
• Nishinaka Hiroyuki
• Matsubayashi Masakazu

Classifications

• B01J37/0201

  Impregnation · CPC title

• B01D2255/20707

  Titanium · CPC title

• B01D2255/902

  Multilayered catalyst · CPC title

• B01D2259/4591

  Construction elements containing cleaning material, e.g. catalysts · CPC title

• B01J23/30 Primary

  Tungsten · CPC title