US 2004/0072684 A1 · Photocatalytic hydrophilifiable material

Abstract

In a formulation comprising titanium dioxide as a photocatalyst and an amphoteric metal oxide (alumina or the like) or a basic metal oxide (barium oxide, strontium oxide or the like) as a material having a base point, when a nitrogen oxide (nitrogen monoxide) comes into contact with or approaches titanium dioxide, upon exposed to light, the carbon monoxide is oxidized to nitrogen dioxide (gas) by hydroxy radicals as an active oxygen species produced by titanium dioxide. As is apparent from the molecular structure, nitrogen dioxide is an acidic gas, alumina is an amphoteric metal oxide, and barium oxide and strontium oxide are a basic metal oxide. The oxygen atom thereof serves as a base point to an acid gas. Therefore, nitrogen dioxide is attracted and chemically bonded to the oxygen atom, held on the metal oxide, and kept close to titanium dioxide as the photocatalyst.

Claims66

Dependent claims

A composition comprising:

a first component comprising a photocatalyst that photocatalyzes a reaction of a reactant to a product;
a second component that has a chemical formula different from the chemical formula of said first component, and that chemically bonds to the reactant or to an intermediate of the reaction, said second component being present in an amount sufficient to enhance the reaction;
and
a third component that has a chemical formula different from the chemical formulas of said first and second components, and that chemically adsorbs and holds hydroxyl groups, said third component being present in an amount sufficient to impart hydrophilicity to said composition.

1 more element

Dependencies are inferred from the claim text.

Photocatalytic hydrophilifiable material

Life of this patent

Photocatalytic hydrophilifiable material

Life of this patent

Abstract

Claims66