초록 ▼

A nanocomposite particle, its use as a catalyst, and a method of making it are disclosed. The nanocomposite particle comprises titanium dioxide nanoparticles, metal oxide nanoparticles, and a surface stabilizer. The metal oxide nanoparticles are formed hydrothermally in the presence of the titanium

A nanocomposite particle, its use as a catalyst, and a method of making it are disclosed. The nanocomposite particle comprises titanium dioxide nanoparticles, metal oxide nanoparticles, and a surface stabilizer. The metal oxide nanoparticles are formed hydrothermally in the presence of the titanium dioxide nanoparticles. The nanocomposite particle is an effective catalyst support, particularly for DeNOx catalyst applications.

대표청구항 ▼

1. A process for reducing nitrogen oxides in a waste stream by: contacting the waste stream with a catalyst, wherein the catalyst includes: (A) a nanocomposite particle, the nanocomposite particle comprising: (i) predominantly anatase titanium dioxide nanoparticles;(ii) metal oxide nanoparticles sel

1. A process for reducing nitrogen oxides in a waste stream by: contacting the waste stream with a catalyst, wherein the catalyst includes: (A) a nanocomposite particle, the nanocomposite particle comprising: (i) predominantly anatase titanium dioxide nanoparticles;(ii) metal oxide nanoparticles selected from the group consisting of zirconium dioxide, cerium dioxide, hafnium oxide, tin oxide, niobium oxide, tantalum oxide, and combinations thereof; and(iii) a surface stabilizer selected from the group consisting of silicon dioxide, aluminum oxide, phosphorus pentoxide, aluminum silicate and aluminum phosphate, and combinations thereof; and(B) at least one metal component comprising a metal selected from the group consisting of platinum, gold, silver, palladium, copper, tungsten, molybdenum, vanadium, iron, rhodium, nickel, manganese, chromium, cobalt, ruthenium, and combinations thereof. 2. The process of claim 1, wherein the at least one metal component is selected from the group consisting of tungsten and vanadium. 3. The process of claim 2, wherein the catalyst comprises about 0.1 to about 10 weight percent vanadium and about 4 to about 20 weight percent tungsten. 4. The process of claim 1, wherein the metal oxide nanoparticles are zirconium dioxide. 5. The process of claim 1, wherein the nanocomposite particles comprise about 50 to about 95 weight percent of titanium dioxide nanoparticles, about 2 to about 48 weight percent metal oxide nanoparticles, and about 2 to about 20 weight percent surface stabilizer. 6. The process of claim 1, wherein the nanocomposite particle has a surface area greater than about 60 m2/g after being calcined at 800° C. for six hours.