AEI zeolite containing phosphorus and production method therefor

Patent metadata

Field	Value
Publication number	US-10035141-B2
Application number	US-201414903355-A
Country	US
Kind code	B2
Filing date	Jul 9, 2014
Priority date	Jul 10, 2013
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

Provided is AEI zeolite having a uniform acid strength of an appropriate degree. AEI zeolite comprising phosphorus, preferably AEI zeolite comprising phosphorus in the pores, and a method for producing AEI zeolite comprising a crystallization step of crystallizing a raw material mixture containing a tetraethylphosphonium cation.

First claim

The invention claimed is:

1. AEI zeolite comprising phosphorus wherein the AEI zeolite is crystalline aluminosilicate, containing phosphorous in the pores.

2. The AEI zeolite according to claim 1 , wherein a molar ratio of phosphorus relative to framework metal is not less than 0.001 and not greater than 0.1.

3. The AEI zeolite according to claim 1 , wherein a molar ratio of silica relative to alumina is not less than 10 and not greater than 35.

4. The AEI zeolite according to claim 1 , comprising a transition metal.

5. The AEI zeolite according to claim 4 , wherein the transition metal is at least any one of iron and copper.

6. The AEI zeolite according to claim 4 , wherein a molar ratio of the transition metal relative to aluminum is not less than 0.1 and not greater than 0.5.

7. A method for producing the AEI zeolite described in claim 1 , comprising a crystallization step of crystallizing a raw material mixture containing a tetraethylphosphonium cation and FAU crystalline aluminosilicate having a lattice constant of not less than 24.30 Å.

8. The method for producing the AEI zeolite according to claim 7 , wherein a compound containing a tetraethylphosphonium cation is at least one selected from the group consisting of tetraethylphosphonium hydroxide, tetraethylphosphonium bromide, and tetraethylphosphonium chloride.

9. The method for producing the AEI zeolite according to claim 7 , wherein the FAU crystalline aluminosilicate is Y zeolite.

10. The method for producing the AEI zeolite according to claim 7 , comprising a step of heat-treating AEI zeolite in a non-oxidizing environment.

11. The method for producing the AEI zeolite according to claim 10 , wherein the non-oxidizing environment is at least any one of a nitrogen environment and an environment containing from 1 to 10 volume % hydrogen.

12. A catalyst comprising the AEI zeolite described in claim 1 .

13. A nitrogen oxide reduction catalyst comprising the AEI zeolite described in claim 1 .

14. A method for reducing nitrogen oxide comprising contacting the AEI zeolite of claim 1 with nitrogen oxide.

Assignees

• Tosoh Corp
• Univ Hiroshima

Inventors

• Sano Tsuneji
• Sadakane Masahiro
• Takamitsu Yasuyuki

Classifications

• B01D53/8628

  Processes characterised by a specific catalyst · CPC title

• B01D2255/50

  Zeolites · CPC title

• B01J2229/186

  not in framework positions · CPC title

• C01B39/48

  using at least one organic template directing agent · CPC title

• C01B39/54 Primary

  Phosphates, e.g. APO or SAPO compounds · CPC title