Patent ID: 6908881
Filing Date: 2005-06-21
Classification: B01D,B01J,B82Y,C01G,C01P,H01G,Y02E,Y02P,Y02W

Abstract:
1. 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; and said titanium dioxide further having a peak area ratio (O1s/Ti2p) of a peak area obtained by X-ray photoelectron spectroscopy assigned to the 1s 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.