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AssigneeToshiba Materials Co., Ltd.
InventorsKayo Nakano, Akira Sato, Yasuhiro Shirakawa, Masami Okamura, Ryotaro Matsuda, Takaya Kamakura, Kazunari Otsuka, Kiyoshi Yokokura, Hideki Okawa, Ariyoshi Ishizaki
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An object of the invention is to provide a photocatalyst material having a higher catalyst effect than conventional photocatalyst materials. The photocatalyst material of the invention contains, as its major component, a tungsten oxide powder excited by a light source which emits light having a wavelength of 430 to 500 nm, the photocatalyst material having a decomposition ability of 50% or more wherein the decomposition ability is given by the following equation based on the following test: [Test for Decomposition Ability] 1 g of a tungsten oxide powder and 20 ppm of acetaldehyde (amount A) are poured into a 3-liter glass container, and acetaldehyde (amount B) is measured after light having a peak wavelength of 460 nm±10 nm is irradiated to the mixture for 2 hours to measure the decomposition ability (%): Decomposition ability(%)=[(acetaldehyde amount A−acetaldehyde amount B)/acetaldehyde amount A]×100.
A photocatalyst material comprising, as its major component, a tungsten oxide powder excited by a light source which emits light having a wavelength of 430 to 500 nm, the photocatalyst material having a decomposition ability of 50% or more wherein the decomposition ability is given by the following equation based on the following test:
A photocatalyst material comprising, as its major component, a tungsten oxide microparticle excited by irradiation with visible light, the photocatalyst material having such a decomposition ability that a residual rate of acetaldehyde is 50% or less 30 minutes after 10 ppm of acetaldehyde gas is introduced into an airtight container having a capacity of 3 liters and 0.1 g of tungsten oxide microparticles in the container are irradiated with blue light.
Dependencies are inferred from the claim text.