# US 9,433,933 B2 · Titania photocatalytic compounds and methods of making the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,433,933 B2 - Document ID: US9433933B2 - Status: Granted - Kind: B2 - Application number: 13/741,191 - Filed: 2013-01-14 - Published: 2013-08-01 - Granted: 2016-09-06 - Earliest claimed: 2012-01-18 - Assignees: Nitto Denko Corporation - Applicants: Nitto Denko Corporation - Inventors: Ekambaram Sambandan; Rajesh Mukherjee; Takuya Fukumura - Web page: https://patentgrep.com/patent/US9433933B2 ## CPC - B01J 27/24: Nitrogen compounds - B01J 19/123: {Ultraviolet light} - B01J 19/127: {Sunlight; Visible light} - B01J 19/128: {Infrared light} - B01J 21/063: {Titanium; Oxides or hydroxides thereof} - B01J 23/06: of zinc, cadmium or mercury - B01J 23/14: of germanium, tin or lead - B01J 23/626: {with tin} - B01J 23/66: Silver or gold - B01J 27/22: Carbides - B01J 35/39: Photocatalytic properties - B01J 37/086: {Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid} - B01J 37/088: {Decomposition of a metal salt} - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The photocatalyst of claim 1, wherein r is no more than about 0.05. ### Claim 3 (depends on 1) The photocatalyst of claim 1, wherein M is selected from the group consisting of Sn, Ni, Sr, Ba, Fe, Bi, and combinations thereof. ### Claim 4 (depends on 3) The photocatalyst of claim 3, wherein r is in the range of about 0.0001 to about 0.15. ### Claim 5 (depends on 1) The photocatalyst of claim 1, wherein M is selected from the group consisting of Mo, W, and combinations thereof. ### Claim 6 (depends on 5) The photocatalyst of claim 5, wherein r is in the range of about 0.0001 to about 0.10. ### Claim 7 (depends on 1) The photocatalyst of claim 1, wherein M is V. ### Claim 8 (depends on 7) The photocatalyst of claim 7, wherein r is in the range of about 0.0001 to about 0.05. ### Claim 9 (depends on 1) The photocatalyst of claim 1, wherein M is Sn. ### Claim 10 (depends on 1) The photocatalyst of claim 1, wherein x is in the range of about 0.001 to about 0.07. ### Claim 11 (depends on 1) The photocatalyst of claim 1, wherein y is in the range of about 0.001 to about 0.05. ### Claim 12 (depends on 1) The photocatalyst of claim 1, wherein the photocatalyst is selected from the group consisting of (Ti0.99Sn0.01)(O2-x-yCxNy), (Ti0.97Sn0.03)(O2-x-yCxNy), (Ti0.95Sn0.05)(O2-x-yCxNy), (Ti0.90Sn0.10)(O2-x-yCxNy), (Ti0.85Sn0.15)(O2-x-yCxNy), (Ti0.985Ni0.015)(O2-x-yCxNy), (Ti0.98Ni0.02)(O2-x-yCxNy), (Ti0.97Ni0.03)(O2-x-yCxNy), (Ti0.99Sr0.01)(O2-x-yCxNy), (Ti0.97Sr0.03)(O2-x-yCxNy), (Ti0.95Sr0.05)(O2-x-yCxNy), (Ti0.97Ba0.03)(O2-x-yCxNy), (Ti0.95Ba0.05)(O2-x-yCxNy), (Ti0.94Sn0.05Fe0.01)(O2-x-yCxNy), (Ti0.94Sn0.05Ni0.01)(O2-x-yCxNy), (Ti0.99Fe0.01)(O2-x-yCxNy), (Ti0.95Zn0.05)(O2-x-yCxNy), (Ti0.77Sn0.15Cu0.08)(O2-x-yCxNy), (Ti0.85Zn0.15)(O2-x-yCxNy), (Ti0.90Bi0.10)(O2-x-yCxNy), (Ti0.996V0.004)(O2-x-yCxNy), (Ti0.984V0.016)(O2-x-yCxNy), (Ti0.970V0.03)(O2-x-yCxNy), (Ti0.997Mo0.003)(O2-x-yCxNy), (Ti0.984Mo0.016)(O2-x-yCxNy), (Ti0.957Mo0.043)(O2-x-yCxNy), (Ti0.97W0.03)(O2-x-yCxNy), and (Ti0.95W0.05)(O2-x-yCxNy). ### Claim 13 (depends on 12) The photocatalyst of claim 12, wherein the photocatalyst is selected from the group consisting of (Ti0.95Sn0.05)(O2-x-yCxNy), (Ti0.90Sn0.10)(O2-x-yCxNy), and (Ti0.85Sn0.15)(O2-x-yCxNy). ### Claim 14 (depends on 1) A composition comprising the photocatalyst of claim 1 and a noble metal. ### Claim 15 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. ### Claim 16 (depends on 15) The composition of claim 15, wherein the noble metal is selected from the group consisting of Pt, Ag, and combinations thereof. ### Claim 17 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. ### Claim 18 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.