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US 6,908,881 B1Granted
Visible radiation type photocatalyst and production method thereof
AssigneeEcodevice Laboratory Co., Ltd.
InventorShinichi Sugihara
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AssigneeEcodevice Laboratory Co., Ltd.
InventorShinichi Sugihara
Estimating the term…
The invention is directed to a catalyst having activity under the irradiation of a visible light, the catalyst being an oxide semiconductor such as an anatase type titanium dioxide, having stable oxygen defects. A method for producing a catalyst having activity under the irradiation of a visible light which comprises treating an oxide semiconductor with hydrogen plasma or with a plasma of a rare gas element, comprising performing the treatment in a state substantially free from the intrusion of air into the treatment system is also provided. An article comprising a base material having the catalyst above provided on the surface thereof and a method for decomposing a substance, comprising bringing an object to be decomposed into contact with the catalyst above under the irradiation of a light containing at least a visible radiation are disclosed. A novel photocatalyst which enables use of a visible radiation is provided, as well as a method utilizing the photocatalyst for removing various substances containing an organic matter or bacteria by photodecomposition.
A catalyst having activity under an irradiation of visible light in a wavelength region from about 400 to 600 nm, comprising titanium dioxide having stable oxygen defects and exhibiting NOx oxidation activity under the irradiation of a visible light at least in the wavelength region of from about 400 to 600 nm;
A catalyst having activity under an irradiation of visible light, said catalyst comprising titanium dioxide having stable oxygen defects and a peak area ratio (O1s/Ti2p) of a peak area obtained by X-ray photoelectron spectroscopy assigned to the 1Is electrons of oxygen (O1s) participating in the bonds with titanium to a peak area obtained by X-ray photoelectron spectroscopy assigned to the 2p electrons of titanium (Ti2p) of 1.99 or lower.
A method for producing a catalyst comprising titanium dioxide having stable oxygen defects and a ratio of a peak area obtained by X-ray photoelectron spectroscopy assigned to the Is electrons of oxygen participating in the bonds with titanium to a peak area obtained by X-ray photoelectron spectroscopy assigned to the 2p electrons of titanium (O1s/Ti2p) of 1.99 or lower and having activity under an irradiation of a visible light, said method comprising treating the titanium dioxide with hydrogen plasma, characterized by performing said treatment in a state substantially free from an intrusion of air into a treatment system.
A method for producing a catalyst comprising titanium dioxide having stable oxygen defects and a ratio of a peak area obtained by X-ray photoelectron spectroscopy assigned to the 1s electrons of oxygen participating in the bonds with titanium to a peak area obtained by X-ray photoelectron spectroscopy assigned to the 2p electrons of titanium (O1s/Ti2p) of 1.99 or lower and having activity under an irradiation of a visible light, said method comprising treating the titanium dioxide with a plasma of rare gas, and performing said treatment in a state substantially free from an intrusion of air into a treatment system.
A method for producing a catalyst comprising titanium dioxide having stable oxygen defects and a ratio of a peak area obtained by X-ray photoelectron spectroscopy assigned to the 1s electrons of oxygen participating in the bonds with titanium to a peak area obtained by X-ray photoelectron spectroscopy assigned to the 2p electrons of titanium (O1s/Ti2p) of 1.99 or lower and having activity under an irradiation of visible light, comprising the step of introducing ions of a rare gas on at least a portion of the surface of the titanium dioxide by means of ion implantation.
Dependencies are inferred from the claim text.