Titanium oxide and photocatalyst

• US 7,011,808 B2
• Filed: 07/11/2001
• Issued: 03/14/2006
• Est. Priority Date: 07/17/2000
• Status: Expired due to Fees

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Sakatani, Yoshiaki, Ando, Hiroyuki, Koike, Hironobu
• Primary Examiner(s): Silverman, Stanley S.
• Assistant Examiner(s): Johnson, Edward M.
• Application Number:
  US09/901,609
• Publication Number:
  US 20020021999A1
• Time in Patent Office: 1,707 Days
• Field of Search: 423/610, 502/350, 106/436
• US Class Current: 423/610
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/031 Precipitation
• CPC Class Codes: C01G 23/0532 by hydrolysing sulfate-containing salts
• CPC Class Codes: C01P 2006/62 L* (lightness axis)
• CPC Class Codes: C01P 2006/63 a* (red-green axis)

Abstract

A titanium oxide showing sufficiently high photocatalytic activities by irradiation of visible light is provided. Using the titanium oxide, an excellent photocatalyst and photocatalyst coating composition are also provided. The titanium oxide has a selected ion chromatogram in which an evolution gas having 28 of a ratio of mass number to electric charge quantity exhibits at least one peak at about 600° C. or higher, the selected ion chromatogram being measured in a thermogravimetry-mass-spectroscopy.

Claims

1. A titanium oxide having a selected ion chromatogram in which an evolution gas having 28 of a ratio of mass number to electric charge quantity exhibits at least one peak at about 600°

C. or higher, and further having a selected ion chromatogram in which an evolution gas having 64 of a ratio of mass number to electric charge quantity exhibits at least one peak at 800°

C. or higher, the selected ion chromatogram being measured in a thermogravimetry-mass-spectroscopy.

2. The titanium oxide according to claim 1, further having a selected ion chromatogram in which an evolution gas having 14 of a ratio of mass number to electric charge quantity exhibits a peak at about 600°

C. or higher, the selected ion chromatogram being measured in a thermogravimetry-mass-spectroscopy.

3. The titanium oxide according to claim 2, wherein said peak of the evolution gas having 14 of a ratio of mass number to electric charge quantity is exhibited at about 950°

C. or lower.

4. The titanium oxide according to claim 1, wherein said peak of the evolution gas having 28 of a ratio of mass number to electric charge quantity is exhibited at about 950°

C. or lower.

5. The titanium oxide according to any one of claims 1 to 3, wherein the selected ion chromatogram is measured under a condition of applying a Channeltron Electron Multiplier voltage of 1000V.

6. The titanium oxide according to any one of claims 1 to 3, wherein the selected ion chromatogram is measured under a condition of applying a Channeltron Electron Multiplier voltage of 1500V.

7. A photocatalyst containing the titanium oxide as claimed in any one of claims 1 to 3 as a catalyst component.

8. A photocatalyst coating composition comprising the titanium oxide as claimed in any one of claims 1 to 3 and a solvent.

9. The titanium oxide according to claim 1, further having a* value of from −

6 to −

2 in terms of L*a*b* color space.

10. The titanium oxide according to claim 1, further having b* value of 8 or more in terms of L*a*b* color space.

11. The titanium oxide according to claim 1, further having b* value of 15 or more in terms of L*a*b* color space.

12. A photocatalyst containing the titanium oxide as claimed in any of claims 9 to 11 as a catalyst component.

13. A photocatalyst coating composition comprising the titanium oxide as claimed in any of claims 9 to 11 and a solvent.