Methods for removing organic compounds from nano-composite materials

• US 20040151651A1
• Filed: 01/30/2003
• Published: 08/05/2004
• Est. Priority Date: 01/30/2003
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Parikh, Atul Navinchandra, Navrotsky, Alexandra
• Granted Patent: US 6,960,327 B2
• Time in Patent Office: Days
• US Class Current: 423/335
• CPC Class Codes: C01B 39/02 Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
• CPC Class Codes: C01B 39/026 After-treatment

Abstract

The present invention provides methods for selectively removing organic compound from a nano-composite material which comprises the organic compound that is dispersed within a solid inorganic compound structure. In particular, methods of the present invention comprise irradiating the nano-composite material with electromagnetic radiation wavelength that is shorter than the wavelength of visible light.

Claims

1. A method for removing an organic compound from a nano-composite material which comprises the organic compound that is dispersed within a solid inorganic compound structure, said method comprising exposing the nano-composite material to electromagnetic radiation having a wavelength shorter than visible light under conditions sufficient to selectively remove the organic compound from the nano-composite material to produce a microporous inorganic material.

2. The method of claim 1, wherein the organic compound in the nano-composite material is dispersed substantially uniformly within the solid inorganic compound structure.

3. The method of claim 1, wherein the wavelength of electromagnetic radiation is about 280 nm or less.

4. The method of claim 3, wherein the electromagnetic radiation is deep ultraviolet light.

5. The method of claim 1, wherein the nano-composite material is exposed to the electromagnetic radiation in the presence of oxygen gas.

6. The method of claim 1, wherein removal of the organic compound from the nano-composite material is conducted at a temperature of less than about 100°

C.

7. The method of claim 1, wherein the organic compound is removed from one or more selected regions of the nano-composite material by exposing only the selected regions of the nano-composite material to the electromagnetic radiation.

8. The method of claim 7, wherein said method of removing the organic compound from the selected regions of the nano-composite material comprises placing a mask over the nano-composite material prior to exposing the selected regions of the nano-composite material to the electromagnetic radiation.

41. A microporous inorganic material produced by the method of claim 1.

9. A method for producing a structured microporous inorganic material, said method comprising:

(a) producing a nano-composite material from a mixture comprising an organic compound and an inorganic compound such that the organic compound is dispersed within a first structured solid inorganic compound structure; and

(b) removing the organic compound from the nano-composite material by exposing the nano-composite material to an electromagnetic radiation having a wavelength shorter than visible light under conditions sufficient to produce the structured microporous inorganic material.

10. The method of claim 9, wherein the structure of the inorganic compound of said step (b) is substantially different from the first structured solid inorganic compound structure of said step (a).

11. The method of claim 9, wherein the structure of the inorganic compound of said step (b) is substantially similar to the first structured solid inorganic compound structure of said step (a).

12. The method of claim 9, wherein the wavelength of electromagnetic radiation is about 280 nm or less.

13. The method of claim 12, wherein the electromagnetic radiation is deep ultraviolet light.

14. The method of claim 9, wherein exposure of the nano-composite material to the electromagnetic radiation is conducted in the presence of oxygen gas.

15. The method of claim 9, wherein exposure of the nano-composite material to the electromagnetic radiation is conducted at a temperature of less than about 100°

C.

16. The method of claim 9, wherein the structured inorganic material is a crystalline material.

17. The method of claim 9, wherein the structured inorganic material is an amorphous material.

18. A method for producing a microporous inorganic oxide material, said method comprising:

preparing a reaction mixture capable of forming an inorganic oxide, wherein the reaction mixture also comprises an organic compound;

producing a nano-composite material from the reaction mixture, wherein the nano-composite material comprises the organic compound that is dispersed within a solid inorganic oxide structure; and

selectively removing the organic compound by exposing the nano-composite material to an electromagnetic radiation having a wavelength shorter than visible light to produce the microporous inorganic oxide material.

19. The method of claim 18, wherein the microporous inorganic oxide is a hexagonally-packed microporous metal oxide.

20. The method of claim 18, wherein the inorganic oxide is selected from the group consisting of silicon oxide, a transition metal oxide, a lanthanide metal oxide, and a combination thereof.

21. The method of claim 18, wherein the microporous inorganic oxide material is a microporous silica material or a microporous aluminophosphate material.

22. The method of claim 18, wherein the organic compound is a small organic molecule, a synthetic polymer, a biological material, or a combination of two or more thereof.

23. The method of claim 18, wherein the reaction mixture is an aqueous solution.

24. The method of claim 18 further comprising drying the nano-composite material prior to exposing the nano-composite material to the electromagnetic radiation.

25. The method of claim 24, wherein the nano-composite material is dried at a temperature of less than about 200°

C.

26. The method of claim 25, wherein the nano-composite material is dried at a temperature in the range from about 25°

C. to about 200°

C.

27. The method of claim 18 further comprising calcining the microporous inorganic oxide material.

28. The method of claim 18, wherein the wavelength of electromagnetic radiation is about 280 nm or less.

29. The method of claim 28, wherein the electromagnetic radiation is deep ultraviolet light.

30. The method of claim 28, wherein exposure of the nano-composite material to the electromagnetic radiation is conducted at a temperature of less than about 100°

C.

31. The method of claim 18, wherein said step of exposing the nano-composite material to the electromagnetic radiation is conducted in the presence of oxygen gas.

32. The method of claim 31, wherein the nano-composite material is exposed to the electromagnetic radiation for about 0.1 to about 100 hours.

33. A method for producing a microporous inorganic material, said method comprising:

producing a nano-composite material which comprises an organic compound that is dispersed within a solid inorganic compound structure; and

selectively removing the organic compound from the nano-composite material to produce the microporous inorganic material by irradiating the nano-composite material with light having a wavelength shorter than visible light under conditions sufficient to selectively remove the organic compound from the nano-composite material.

34. The method of claim 33, wherein said step of exposing the nano-composite material to light is conducted in the presence of oxygen gas.

35. The method of claim 34, wherein said step of exposing the nano-composite material to light is conducted at a temperature of less than about 100°

C.

36. A method for producing a crystalline inorganic material comprising:

producing a crystalline nano-composite material which comprises an organic compound that is dispersed within a solid inorganic crystalline structure; and

selectively removing the organic compound by exposing the nano-composite material to light having a wavelength smaller than the wavelength of visible light under conditions sufficient to produce the crystalline inorganic material.

37. The method of claim 36, wherein the crystalline inorganic material is a microporous crystalline material.

38. The method of claim 37, wherein the wavelength of light ranges from about 260 nm to about 180 nm.

39. A method for producing a microporous inorganic material comprising:

producing a nano-composite material, wherein the nano-composite material comprises a majority of individual organic molecule that is separated from other organic molecules within a solid inorganic material framework; and

selectively removing the organic molecules from the nano-composite material by exposing the nano-composite material to deep ultraviolet light under conditions sufficient to produce the microporous inorganic material.

40. The method of claim 39, wherein the nano-composite material is exposed to deep ultraviolet light in the presence of oxygen.