초록 ▼

Embodiments of the present invention relate to a method for synthesizing nanocrystalline zeolites, the method comprising contacting starting products that comprise a solvent, a silicon source, a cation base, an organic template, and an aluminum source, or any combination thereof sufficient to produc

Embodiments of the present invention relate to a method for synthesizing nanocrystalline zeolites, the method comprising contacting starting products that comprise a solvent, a silicon source, a cation base, an organic template, and an aluminum source, or any combination thereof sufficient to produce a zeolite gel by hydrolysis, heating the zeolite gel sufficient to produce a first batch of zeolite crystals and a first clear solution, separating the first batch of zeolite crystals from the first clear solution, heating the first clear solution sufficient to produce a second batch of zeolite crystals and second clear solution and separating the second batch of zeolite crystals from the second clear solution. In addition, embodiments relate to a method of using nanocrystalline zeolites, the method comprising contacting a nanocrystalline zeolite with a reductant sufficient to produce a nanocrystalline zeolite with adsorbed reductant and exposing the nanocrystalline zeolite with adsorbed reductant to reactant gases sufficient to obtain reaction products and the nanocrystalline zeolite.

대표청구항 ▼

What is claimed is: 1. A method for synthesizing nanocrystalline zeolites, the method comprising: (a) contacting starting products that comprise a solvent, a silicon source, a cation base, an organic template, optionally an aluminum source, or any combination thereof; sufficient to produce a zeolit

What is claimed is: 1. A method for synthesizing nanocrystalline zeolites, the method comprising: (a) contacting starting products that comprise a solvent, a silicon source, a cation base, an organic template, optionally an aluminum source, or any combination thereof; sufficient to produce a zeolite gel by hydrolysis; (b) heating the zeolite gel, at atmospheric pressure sufficient to produce a first batch of nano crystalline zeolite crystals and a first clear solution; (c) separating the first batch of nanocrystalline zeolite crystals from the first clear solution by centrifugation; (d) heating the first clear solution at atmospheric pressure, without addition of additional silicon source, organic template, optional aluminum source, or any combination thereof, sufficient to produce a second batch of zeolite crystals and second clear solution; (e) separating the second batch of nanocrystalline zeolite crystals from the second clear solution by centrifugation; wherein the nanocrystalline zeolite crystals have a size smaller than 100 nm, and (f) calcining the nanocrystalline zeolites to remove organic templates. 2. The method of claim 1, wherein the solvent comprises water. 3. The method of claim 1, wherein the silicon source comprises tetraethylorthosilane (TEOS) (C8H20O4Si), colloidal silica, disodium metasilicate (Na2O3Si) and any combination thereof. 4. The method of claim 1, wherein the cation base comprises sodium hydroxide (NaOH), potassium hydroxide (KOH) and any combination thereof. 5. The method of claim 1, wherein the organic template comprises tetrapropyl ammonium hydroxide (TPAOH) (C12H29NO), tetramethyl ammonium hydroxide (TMAOH) (C4H13NO), tetramethyl ammonium bromide (C4H12BrN), tetrapropyl ammonium bromide (C12H28BrN) and any combination thereof. 6. The method of claim 1, wherein the aluminum source comprises aluminum isopropoxide (C9H21AlO3), sodium aluminate (AlNaO2), aluminum sulfate (Al2O12S3) and any combination thereof. 7. The method of claim 1, further comprising heating the second clear solution without addition of additional silicon source, organic template, optional aluminum source, or any combination thereof, sufficient to provide a third batch of zeolite crystals and a third clear solution, and separating the third batch of zeolite crystals from the third clear solution. 8. The method of claim 1, wherein heating is carried out at from 30-90° C. and the nanocrystalline zeolite crystals comprise zeolite silicalite-1. 9. The method of claim 1, wherein heating is carried out at from 45-135° C. and the nanocrystalline zeolite crystals comprise zeolite Y. 10. The method of claim 1, wherein the starting products comprise water, tetraethylorthosilane (TEOS) (C8H20O4Si), sodium hydroxide (NaOH) and tetrapropyl ammonium hydroxide (TPAOH) (C12H29NO). 11. The method of claim 1, wherein the starting products comprise water, tetraethylorthosilane (TEOS) (C8H20O4Si), sodium hydroxide (NaOH), tetramethyl ammonium hydroxide (TMAOH) (C4H13NO) and aluminum isopropoxide (C9H21AlO3). 12. The method of claim 1, wherein the zeolite gel comprises water, sodium hydroxide (NaOH), tetrapropyl ammonium hydroxide (TPAOH) (C12H29NO), silicon (Si) and ethanol (C2H6O). 13. The method of claim 1, wherein the zeolite gel comprises water, sodium (Na), tetramethyl ammonium hydroxide (TMAOH) (C4H13NO), i-propanol (C3H8O), silicon (Si), aluminum (Al) and ethanol (C2H6O).