# US 10,500,579 B2 · Metatitanic acid particle, composition for forming photocatalyst, and photocatalyst

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- Number: US 10,500,579 B2
- Document ID: US10500579B2
- Status: Granted
- Kind: B2
- Application number: 15/891,497
- Filed: 2018-02-08
- Published: 2018-11-01
- Granted: 2019-12-10
- Earliest claimed: 2017-04-26
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Hideaki Yoshikawa; Yasunobu Kashima; Takeshi Iwanaga; Sakae Takeuchi; Hiroyoshi Okuno
- Web page: https://patentgrep.com/patent/US10500579B2

## CPC

- B01J 31/38: of titanium, zirconium or hafnium
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 31/069: {Hybrid organic-inorganic polymers, e.g. silica derivatized with organic groups (nitrogen containing groups on mineral substrates B01J31/0254; organometallic polymers B01J31/123; coordination complexes immobilised on an inorganic support B01J31/1616; coordination polymers, e.g. metal-organic frameworks B01J31/1691)}
- B01J 35/39: Photocatalytic properties
- B01J 37/0045: {Drying a slurry, e.g. spray drying}
- B01J 37/033: {Using Hydrolysis}
- B01J 37/344: {of electromagnetic wave energy}
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- G01N 2021/3155: {Measuring in two spectral ranges, e.g. UV and visible}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A metatitanic acid particle includes a metal compound having a titanium metal atom and a carbon atom, and being bonded to a surface of the particle via an oxygen atom, wherein an element ratio (C/Ti) between carbon and titanium on the surface is in a range of 0.2 to 1.1 and the metatitanic acid particle has an absorption at a wavelength of each of 450 nm and 750 nm in a visible absorption spectrum.

## Claims

### Claim 1

A metatitanic acid particle, comprising:
a core particle containing metatitanic acid (TiO(OH)2)as a major component; and
a metal compound, which includes a titanium metal atom and a carbon atom, bonded to a surface of the core particle via an oxygen atom,
wherein an element ratio (C/Ti) between carbon and titanium on a surface of the metatitanic acid particle is in a range of 0.2 to 1.1; and
the metatitanic acid particle has an absorption at a wavelength of each of 450 nm and 750 nm in a visible absorption spectrum.

### Claim 2 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein the metatitanic acid particle has an absorption in a whole range of wavelengths of from 400 nm to 800 nm in the visible absorption spectrum.

### Claim 3 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein an element ratio (O/Ti) between oxygen and titanium on the surface of the metatitanic acid particle is in a range of 2.05 to 2.50.

### Claim 4 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein the carbon atom is included in a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms, an unsaturated aliphatic hydrocarbon group having 2 to 20 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms.

### Claim 5 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein the carbon atom is included in a saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms.

### Claim 6 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein the carbon atom is included in a saturated aliphatic hydrocarbon group having 4 to 10 carbon atoms.

### Claim 7 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein a volume average particle diameter of the metatitanic acid particles is in a range of 10 nm to 1 μm.

### Claim 8 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein an element ratio (O/Ti) between oxygen and titanium on the surface of the metatitanic acid particle is in a range of 2.10 to 2.40.

### Claim 9 (depends on 1)

The metatitanic acid particle according to claim 1,
wherein an element ratio (C/Ti) between carbon and titanium on the surface of the metatitanic acid particle is in a range of 0.3 to 1.0.

### Claim 10 (depends on 1)

A composition for forming a photocatalyst, comprising:
the metatitanic acid particle according to claim 1; and
at least one compound selected from the group consisting of a dispersion medium and a binder.

### Claim 11 (depends on 1)

A photocatalyst comprising:
the metatitanic acid particle according to claim 1.