Sheet-like particles of zeolite and method for producing same

Patent metadata

Field	Value
Publication number	US-11873226-B2
Application number	US-202017617028-A
Country	US
Kind code	B2
Filing date	Jun 11, 2020
Priority date	Jun 14, 2019
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

The invention provides a method for producing sheet-like particles of zeolite that cannot be obtained by a top-down method, and provides sheet-like particles of zeolite having an 8-membered oxygen ring structure obtained by the method. A thickness of the sheet-like particles is 1 nm to 100 nm, and an aspect ratio (maximum width/thickness in particles) of the sheet-like particles is 100 or more.

First claim

The invention claimed is:

1. A method for producing sheet-like particles of zeolite, comprising:
a first step which comprises
forming a bilayer in a solvent,
forming a hyper-swollen lamellar phase of the bilayer by adding, in the solvent, an aluminum atomic source, and at least one atomic source selected from the group consisting of a silicon atomic source and a phosphorus atomic source, and
forming sheet-like particles of a precursor of zeolite between two monomolecular layers, wherein the two monomolecular layers constitute the bilayer and are formed from amphiphilic molecules; and
a second step of bringing the sheet-like particles of the precursor of zeolite into contact with gaseous water in a container to form the sheet-like particles of zeolite,
wherein a thickness of the sheet-like particles of the zeolite is 1 nm or more and 100 nm or less;
an aspect ratio (maximum width/thickness in particles) of the sheet-like particles of the zeolite is 100 or more;
the solvent contained in a whole system in the formation of the hyper-swollen lamellar phase is a mixed solvent containing a hydrocarbon solvent and water, wherein the whole system in the formation of the hyper-swollen lamellar phase means any components which are mixed in order to form the super-swollen lamellar phase and include solutes and solvents; and
a mass ratio of the hydrocarbon-containing solvent and water in the mixed solvent is 85:15 to 99.99:0.01.

2. The method for producing the sheet-like particles of zeolite according to claim 1 ,
wherein a mass ratio of the solvent to whole system in formation of the hyper-swollen lamellar phase is 90% by mass or more.

3. The method for producing the sheet-like particles of zeolite according to claim 1 ,
wherein an amount of water contained in the solvent is 5% by mass or less.

4. The method for producing the sheet-like particles of zeolite according to claim 1 ,
wherein in the second step, contacting with gaseous water is carried out in the presence of a structure-directing agent.

5. The method for producing the sheet-like particles of zeolite according to claim 1 ,
wherein the sheet-like particles of zeolite have a structure represented by “SOD”, “PHI”, “CHA”, or “MFI”, each of which is a structural code of the International Zeolite Association (IZA).

6. The method for producing the sheet-like particles of zeolite according to claim 1 ,
wherein the sheet-like particles of the precursor of zeolite are present in a hyper-swollen lamellar phase in a state where the sheet-like particles are not substantially agglomerated.

7. The method for producing the sheet-like particles of zeolite according to claim 1 ,
wherein a thickness of the sheet-like particles of the precursor of zeolite is 1 nm or more and 100 nm or less, and
an aspect ratio (maximum particle width/particle thickness) of the sheet-like particles of the precursor of zeolite is 100 or more.

8. The method according to claim 1 , wherein the zeolite is aluminosilicate.

Assignees

• Japan Science & Tech Agency

Inventors

• Uchida Yoshiaki
• Sasaki Koki
• Nishiyama Norikazu

Classifications

• C01B39/48 Primary

  using at least one organic template directing agent · CPC title

• C01B39/28 Primary

  Phillipsite or harmotome type {(C01B39/023, C01B39/026, C01B39/06 take precedence)} · CPC title

• C01P2002/01

  depicted by a TEM-image · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title