Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2000-10-27
2004-12-14
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C502S350000
Reexamination Certificate
active
06830741
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a titanium oxide, to a photocatalyst using the titanium oxide and to a photocatalyst coating composition using the titanium oxide.
BACKGROUND OF THE INVENTION
Ultraviolet irradiation to a semiconductor generates electrons having a strong reduction activity and positive holes having a strong oxidation activity, to decompose a molecular species that comes in contact with the semiconductor by an oxidation-reduction activity. Such an activity is called a photocatalytic activity. By the photocatalytic activity, NO
x
in the atmosphere is decomposed, bad-smelling substances, molds or the like in a living or working space are decomposed and removed, environmental pollution substances such as organic solvents, agrochemicals and surfactants in water are decomposes and removed. As a substance showing the photocatalytic activity, titanium oxide is attracting much attention and photocatalysts made of titanium oxide are in the market.
However, the photocatalytic activity shown by the photocatalysts made of titanium oxide available in the present market is not sufficient when the photocatalysts are irradiated with visible light.
SUMMARY OF THE INVENTION
The objects of the present invention is to provide a titanium oxide that shows sufficiently high photocatalytic activities by irradiation of visible light, to provide a photocatalyst using the titanium oxide as a catalyst component and to provide a photocatalyst coating composition using the titanium oxide.
The present inventors have studied on titanium oxide in order to achieve such objects. As a result, the present inventors have found that a specific titanium oxide shows sufficiently high photocatalytic activities by irradiation of visible light, and have completed the present invention.
Thus, the present invention provides a titanium oxide having
(i) three or more peaks within the range of from 1.930 to 2.030 in g value of electron spin resonance spectrum of the titanium oxide, wherein the largest one of the peaks is within the range of from 1.990 to 2.020 in the g value and/or
(ii) a spin concentration X of 1.50×10
16
spins/g or more, which is determined from electron spin resonance spectrum of the titanium oxide measured after irradiation of visible light.
The present invention also provides a photocatalyst containing the above-described titanium oxide as a catalyst component.
The invention further provides a photocatalyst coating composition comprising the above-described titanium oxide and a solvent.
REFERENCES:
patent: 2962353 (1960-11-01), Haimsolm et al.
patent: 3676362 (1972-07-01), Yates
patent: 4046790 (1977-09-01), Armor et al.
patent: 4313021 (1982-01-01), Ryu
patent: 5011674 (1991-04-01), Yoshimoto et al.
patent: 6107241 (2000-08-01), Ogata
patent: 6306796 (2001-10-01), Suzue et al.
patent: 6429169 (2002-08-01), Ichinose
patent: 6627579 (2003-09-01), Sakatani et al.
patent: 41 23 772 (1993-01-01), None
patent: 0 737 513 (1996-10-01), None
patent: 0 774 443 (1997-05-01), None
patent: 1 027 924 (2000-08-01), None
patent: 1 065 169 (2001-01-01), None
patent: 1 125 636 (2001-08-01), None
patent: 1254863 (2002-11-01), None
patent: 427339 (1935-04-01), None
patent: 09-71418 (1997-03-01), None
patent: 11-333304 (1999-12-01), None
patent: WO 00/10706 (2000-03-01), None
Partial English Translation of JP-11-333304-A.
Anpo et al., “Photoformation and Structure of O2−and Nitrogen-Containing Anion Radicals Absorbed on Highly Dispersed Titanium Oxide Anchored onto Porous Vycor Glass”, J. Phys. Chem. 89, pp. 5689-5694.
Chem. Phys. Lett., vol. 123, No. 1,2, Jan. 3, 1986, Shinri Sato, Photocatalytic Activity of Nox—Doped TiO2in the Visible Light Region, pp. 126-128.
Z. Naturforsch. 36A, 226-232 (1981) no month.
The Chemical Society of Japan No. 8 (1986), pp. 1084-1090, and the English translation thereof no month.
Journal of Colloid and Interface Science, vol. 35, No. 3, (1971), pp. 424-433 no month.
Chem. Phys. Lett., vol. 8, No. 1 (1971), pp. 45-48 no month.
Ando Hiroyuki
Koike Hironobu
Sakatani Yoshiaki
Fitch Even Tabin & Flannery
Johnson Edward M.
Silverman Stanley S.
Sumitomo Chemical Company Limited
LandOfFree
Titanium-oxide and photocatalyst and photocatalyst coating... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Titanium-oxide and photocatalyst and photocatalyst coating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Titanium-oxide and photocatalyst and photocatalyst coating... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3281191