AEI type zeolite, method for producing same, and uses thereof

Patent metadata

Field	Value
Publication number	US-11084025-B2
Application number	US-201916439029-A
Country	US
Kind code	B2
Filing date	Jun 12, 2019
Priority date	Nov 21, 2014
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

Provided is a method for producing an inexpensive, high-performance AEI type zeolite and an AEI type zeolite having a Si/Al ratio of 6.5 or less and an acidity of 1.2 mmol/g or more and 3.0 mmol/g or less, by using neither an expensive Y type zeolite as a raw material nor dangerous hydrofluoric acid. The method for producing an AEI type zeolite having a Si/Al ratio of 50 or less includes: preparing a mixture including a silicon atom material, an aluminum atom material, an alkali metal atom material, an organic structure-directing agent, and water; and performing hydrothermal synthesis of the obtained mixture, in which a compound having a Si content of 20% by weight or less and containing aluminum is used as the aluminum atom material; and the mixture includes a zeolite having a framework density of 14 T/1000 Å3 or more in an amount of 0.1% by weight or more with respect to SiO2 assuming that all Si atoms in the mixture are formed in SiO2.

First claim

The invention claimed is:

1. An AEI type zeolite having an acidity of 1.2 mmol/g or more and 3.0 mmol/g or less and a Si/Al ratio of 6.5 or less.

2. The AEI type zeolite according to claim 1 , wherein the AEI type zeolite comprises potassium and/or cesium at a molar ratio of 0.001 or more and 1.0 or less with respect to aluminum.

3. The AEI type zeolite according to claim 1 , wherein the AEI type zeolite has an average primary particle diameter of 0.01 μm or more and 3 μm or less.

4. A catalyst comprising the AEI type zeolite according to claim 1 .

5. The catalyst according to claim 4 , wherein the catalyst excludes an FAU type zeolite.

6. The catalyst according to claim 4 , wherein a metal other than Si and Al is supported on the AEI type zeolite.

7. The catalyst according to claim 6 , wherein Cu is supported on the AEI type zeolite.

8. The catalyst according to claim 7 , wherein the catalyst has a Cu content of 0.1% by weight or more and 10% by weight or less.

9. The catalyst according to claim 4 , wherein the AEI type zeolite comprises potassium and/or cesium; and a molar ratio of the potassium and/or the cesium to aluminum in the catalyst is 0.001 or more and 1.0 or less.

10. A method for exhaust gas treatment, comprising contacting the catalyst according to claim/with an exhaust gas.

11. The method according to claim 10 , wherein the exhaust gas contains a nitrogen oxide.

Assignees

• Mitsubishi Chem Corp

Inventors

• Tanaka Manabu
• Takewaki Takahiko
• Matsuo Takeshi
• Hara Masahiro

Classifications

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J2235/05

  Nuclear magnetic resonance [NMR] · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/30

  characterised by their physical properties · CPC title

• B01J29/76 Primary

  Iron group metals or copper · CPC title