Zeolite-based compound having high crystallinity, method for producing the same, and method for producing methyl acetate using the same

Patent metadata

Field	Value
Publication number	US-10486146-B2
Application number	US-201815966302-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	Apr 28, 2017
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

The present disclosure provides a zeolite-based compound having a high crystallinity, a method for producing the zeolite-based compound, and a method for producing methyl acetate using the zeolite-based compound. The zeolite-based compound includes a zeolite-based core; and a surface-portion formed on at least a portion of a surface of the zeolite-based core and made of ferrierite.

First claim

What is claimed is:

1. A zeolite-based composition having a high crystallinity, the composition comprising:
a zeolite-based core; and
a ferrierite surface-portion formed on at least a portion of a surface of the zeolite-based core, wherein the ferrierite surface-portion has a molar ratio of silicon and aluminum in a range of 5:1 to 30:1.

2. The zeolite-based composition according to claim 1 , wherein the ferrierite constituting the surface-portion is coated in a form of a plate on the surface of the zeolite-based core.

3. The zeolite-based composition according to claim 1 , wherein the zeolite-based core comprises at least one selected from a group consisting of H-ferrierite, mordenite, ZSM-5, and zeolite-Y.

4. A zeolite-based composition comprising:
zeolite-based core; and
a ferrierite surface-portion formed on at least a portion of a surface of the zeolite-based core,
wherein the zeolite-based core is made of a zeolite-based material including silicon and aluminum, wherein a molar ratio of the silicon and aluminum is in a range of 10:1 to 11:1.

5. The zeolite-based composition according to claim 1 , wherein the zeolite-based core and the surface-portion together form a core/shell structure.

6. A method for producing a zeolite-based composition having a high crystallinity, the method comprising:
synthesizing a seed made of a zeolite-based material; and
synthesizing ferrierite on a surface of the seed using the seed as a structure-directing agent,
wherein the seed defines a zeolite-based core of the zeolite-based composition, wherein the ferrierite is formed on at least a portion of the surface of the zeolite-based core, wherein the ferrierite defines a ferrierite surface-portion of the zeolite-based composition, and
wherein the ferrierite surface-portion has a molar ratio of silicon and aluminum in a range of 5:1 to 30:1.

7. The method of claim 6 , wherein in synthesizing the ferrierite on the surface of the seed, the ferrierite formed on the surface of the seed compensates for crystal defects of the seed to enhance an overall crystallinity of the composition.

8. The method of claim 6 , wherein synthesizing the ferrierite on the surface of the seed includes:
producing a silica structure using a basic silica solution and the seed as a structure-directing agent;
hydrothermally synthesizing the silica structure with an alumina solution to form a hydrothermally synthesized product;
firing the hydrothermally synthesized product to produce a basic-ferrierite;
ion-exchanging the basic-ferrierite with an ammonium precursor to produce NH 3 -ferrierite; and
firing the NH 3 -ferrierite to form the H-ferrierite on the surface of the seed.

9. The method of claim 8 , wherein synthesizing the seed comprises:
producing a silica structure using a basic silica solution and piperidine as a structure-directing agent;
hydrothermally synthesizing the silica structure with an alumina solution to form a hydrothermally synthesized product;
firing the hydrothermally synthesized product to produce a basic-ferrierite;
ion-exchanging the basic-ferrierite with an ammonium precursor to produce NH 3 -ferrierite; and
firing the NH 3 -ferrierite to form H-ferrierite as the seed.

10. A method for producing methyl acetate comprising:
performing carbonylation of dimethyl ether using a catalyst,
wherein the catalyst is a zeolite-based composition having a high crystallinity, wherein the composition includes a zeolite-based core, and a ferrierite surface-portion formed on at least a portion of a surface of the zeolite-based core, wherein the ferrierite surface-portion has a molar ratio of silicon and aluminum in a range of 5:1 to 30:1.

11. The zeolite-based composition according to claim 1 , wherein an overall crystallinity of the zeolite-based core and the surface-portion formed thereon is higher than a crystallinity of the zeolite-based core alone.

12. The zeolite-based composition according to claim 1 , wherein the composition has a ratio in a range of 7-24 parts by weight of the zeolite-based core to 100 parts by weight of the surface-portion.

Assignees

• Research & Business Found Sungkyunkwan Univ

Inventors

• Bae Jong Wook
• Kim Ji Hyeon

Classifications

• B01J37/0018

  Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat) · CPC title

• C07C67/37

  by reaction of ethers with carbon monoxide · CPC title

• B01J37/30

  Ion-exchange · CPC title

• C01B39/44 Primary

  Ferrierite type, e.g. types ZSM-21, ZSM-35 or ZSM-38 · CPC title

• B01J29/65

  of the ferrierite type, e.g. types ZSM-21, ZSM-35 or ZSM-38, as exemplified by patent documents US4046859, US4016245 and US4046859, respectively · CPC title