Titania photocatalytic compounds and methods of making the same
AssigneeNitto Denko Corporation
InventorsEkambaram Sambandan, Rajesh Mukherjee, Takuya Fukumura
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Abstract
Disclosed herein are titania photocatalysts, titania photocatalytic compositions, and methods of making the same. The photocatalysts may, for example, be represented by the formula of (Ti1-rMr)(O2-x-yCxNy), where M, r, x, are y defined in the specification. The photocatalysts may, in some embodiments, provide superior photocatalytic activity relative to titania. Also disclosed are methods making the photocatalysts. The method may provide economical techniques for obtaining the titania photocatalysts.
Claims18
A titanium-oxide based photocatalyst represented by the formula of (Ti1-rMr)(O2-x-yCxNy) wherein:
- M is selected from the group consisting of Sn, Ni, Sr, Ba, Fe, V, Mo, W, Zn, Cu, and combinations thereof;
- r is in the range of about 0.0001 to about 0.25;
- x is in the range of about 0.001 to about 0.1;
- y is in the range of about 0.001 to about 0.1;
- and
- wherein the photocatalyst comprises at least 10% anatase phase.
A composition comprising a photocatalyst and a noble metal,
- wherein the photocatalyst is a titanium-oxide based photocatalyst represented by the formula of (ti1-rMr)(O2-x-yCxNy), wherein:
- M is selected from the group consisting of Sn, Ni, Sr, Ba, Fe, Bi, V, Mo, W, Zn, Cu, and combinations thereof;
- r is in the range of about 0.0001 to about 0.25;
- x is in the range of about 0.001 to about 0.1;
- y is in the range of about 0.001 to about 0.1;
- and
- wherein the noble metal is selected from the group consisting of Pt, Ag, Au, Rh, Rb, Re, Ir and combinations thereof.
A method of photocatalytically decomposing a compound, the method comprising:
- heating the compound with a photocatalyst;
- and
- exposing the photocatalyst to electromagnetic radiation having a wavelength between about 200 nm to about 800 nm;
- wherein the photocatalyst is a titanium-oxide based photocatalyst represented by the formula of (Ti1-rMr)(O2-x-yCxNy), wherein:
- M is selected from the group consisting of Sn, Ni, Sr, Ba, Fe, Bi, V, Mo, W, Zn, Cu, and combinations thereof;
- r is in the range of about 0.0001 to about 0.25;
- x is in the range of about 0.001 to about 0.1;
- and
- y is in the range of about 0.001 to about 0.1.
A method of making a photocatalytic composition, the method comprising:
- heating a mixture at a first temperature in the range of about 100° C. to about 800° C. for a heating time of at least about 10 seconds to form a solid, wherein the mixture comprises:
- a titanium compound;
- and
- at least one second metallic compound that comprises at least a second metal element,
- wherein the molar ratio of the titanium to the second metal element in the mixture is in the range of about 10,000:1 to about 3:1;
- and
- heating the solid at a second temperature in the range of about 150° C. to about 650° C. for at least about 1 minute to obtain a photocatalytic composition;
- and
- wherein the photocatalytic composition is represented by the formula of (Ti1-rMr)(O2-x-yCxNy), wherein:
- M is selected from Sn, Ni, Sr, Ba, Fe, Bi, V, Mo, W, Zn, Cu and combinations thereof;
- r is in the range of about 0.0001 to about 0.25;
- x is in the range of about 0.001 to about 0.1;
- and
- y is in the range of about 0.001 to about 0.1.
Dependencies are inferred from the claim text.