Direct synthesis of high-aspect ratio zeolite nanosheets

Patent metadata

Field	Value
Publication number	US-11066309-B2
Application number	US-201715791876-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Oct 24, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

An example material includes a planar layer of MFI zeolite. The planar layer has a thickness in a range between 4 nm and 10 nm for at least 70% of a basal area of the planar layer. In one embodiment, the planar layer includes an embedded particle of an MFI zeolite.

First claim

What is claimed is:

1. A material comprising:
a planar layer of MFI zeolite; and
a MFI zeolite particle embedded in the planar layer of MFI zeolite,
wherein the planar layer has a thickness in a range between 4 nm and 10 nm for at least 70% of a basal area of the planar layer.

2. The material of claim 1 , wherein the planar layer of zeolite has a thickness of approximately 2.5 unit-cells along the b-axis of MFI structure for at least 70% of its basal area, and
wherein the planar layer has a length of at least 0.5 μm along at least two basal orthogonal directions.

3. The material of claim 1 , wherein the planar layer of zeolite has a thickness of approximately 3.5 unit-cells along the b-axis of MFI structure for at least 70% of its basal area, and
wherein the planar layer has a length of at least 0.5 μm along at least two basal orthogonal directions.

4. The material of claim 1 , wherein the planar layer of zeolite has a thickness of approximately 2.5 unit-cells along the b-axis of MFI structure for at least 70% of its basal area, and
wherein the planar layer has a length of 1 μm along at least a basal direction.

5. The material of claim 1 , wherein the planar layer of zeolite has a thickness of approximately 3.5 unit-cells along the b-axis of MFI structure for at least 70% of its basal area, and
wherein the planar layer has a length of 1 μm along at least a basal direction.

6. The material of claim 1 , wherein the planar layer of MFI zeolite has a first orientation,
wherein the MFI zeolite particle has a second orientation, and
wherein a rotational orientation of the first planar layer of MFI zeolite is different than a rotational orientation of the MFI zeolite particle.

7. The material of claim 6 , wherein the rotational orientation of the planar layer of MFI zeolite differs from the rotational orientation of the MFI zeolite particle by approximately 90° about a rotational axis.

8. The material of claim 7 , wherein the rotational axis extends parallel to a basal surface of the planar layer.

9. The material of claim 8 , the material having a single planar layer of MFI zeolite and a single MFI zeolite particle embedded in the planar layer of MRI zeolite.

10. The material of claim 1 , wherein the MFI zeolite particle has maximum dimension less than 200 nm.

11. The material of claim 1 , wherein the planar layer has a length of at least 0.5 μm along at least two orthogonal basal directions.

12. The material of claim 1 , the planar layer defining a network of pores, wherein the network of pores comprises pores having widths between approximately 5 Å and 6 Å.

13. The material of claim 1 , further comprising a porous support structure, wherein the planar layer is disposed on a surface of the support structure.

14. The material of claim 1 , wherein the thickness of the MFI zeolite planar layer is measured by at least one of atomic force microscopy, electron microscopy, or x-ray diffraction.

Assignees

• Univ Minnesota

Inventors

• Tsapatsis Michael
• Jeon Mi Young
• Lee Pyung-Soo
• Kim Donghun
• Kumar Prashant
• Mkhoyan K Andre
• Siepmann Joern Ilja

Classifications

• B01D71/0281

  Zeolites · CPC title

• B01D2325/0283

  Pore size · CPC title

• B01D69/06

  Flat membranes · CPC title

• B01D61/362

  Pervaporation · CPC title

• C01B39/48 Primary

  using at least one organic template directing agent · CPC title