Zeolite

Patent metadata

Field	Value
Publication number	US-10046316-B2
Application number	US-201615545055-A
Country	US
Kind code	B2
Filing date	Feb 4, 2016
Priority date	Feb 5, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

An object of the present invention is to provide an AFX zeolite having a novel structure. An AFX zeolite having a lattice spacing d of a (004) plane being not less than 4.84 Å and not greater than 5.00 Å, and a molar ratio of silica to alumina being not less than 10 and not higher than 32. Such an AFX zeolite can be produced by a production method comprising a crystallization step of crystallizing a composition at a temperature of not lower than 160° C.; the composition containing a silicon source, an aluminum source, a 1,3-di(1-adamantyl)imidazolium cation, and an alkali metal; a molar ratio of hydroxide ions to silica being less than 0.25 or a molar ratio of silica to alumina being not higher than 27; and a molar ratio of the 1,3-di(1-adamantyl)imidazolium cation to silica being less than 0.20.

First claim

The invention claimed is:

1. An AFX zeolite having a lattice spacing d of a (004) plane being not less than 4.84 Å and not greater than 5.00 Å, and a molar ratio of silica to alumina being not less than 10 and not higher than 32.

2. The AFX zeolite according to claim 1 , wherein the lattice spacing d of the (004) plane is not less than 4.925 Å and not greater than 5.00 Å.

3. The AFX zeolite according to claim 1 , wherein the molar ratio of silica to alumina is not less than 10 and not greater than 30.

4. The AFX zeolite according to claim 1 having a lattice spacing d according to the following table:

TABLE 1

Lattice spacing d [Å]

11.81 ± 0.13 

10.13 ± 0.08 

7.59 ± 0.08

6.80 ± 0.06

 4.96 ± 0.035

4.34 ± 0.02

 4.06 ± 0.02.

5. The AFX zeolite according to claim 1 containing primary particles having a hexagonal bipyramids shape.

6. The AFX zeolite according to claim 1 containing crystal particles including primary particles aggregated by chemical bonds.

7. The AFX zeolite according to claim 1 containing one or more types of transition metals selected from the group consisting of groups 8, 9, 10, and 11 of the periodic table.

8. A production method for the AFX zeolite according to claim 1 , the method comprising a crystallization step of crystallizing a composition at a temperature of not lower than 160° C.; the composition containing a silicon source, an aluminum source, a 1,3-di(1-adamantyl)imidazolium cation, and an alkali metal; a molar ratio of hydroxide ions to silica being less than 0.25 or a molar ratio of silica to alumina being not higher than 27; and a molar ratio of the 1,3-di(1-adamantyl)imidazolium cation to silica being less than 0.20.

9. The production method according to claim 8 , wherein the composition contains at least one type selected from the group consisting of 1,3-di(1-adamantyl)imidazolium hydroxide, 1,3-di(1-adamantyl)imidazolium bromide, 1,3-di(1-adamantyl)imidazolium chloride, and 1,3-di(1-adamantyl)imidazolium iodide.

10. The production method according to claim 8 , wherein the composition has the following composition:
SiO 2 /Al 2 O 3 of not less than 10 and less than 100;
OH/SiO 2 of not less than 0.06 and less than 0.25;
Alkali metal/SiO 2 of not less than 0.06 and less than 0.25;
1,3-Di(1-adamantyl)imidazolium cation/SiO 2 of not less than 0.02 and less than 0.20; and
H 2 O/SiO 2 of not less than 5 and less than 60.

11. The production method according to claim 8 , wherein the composition has the following composition:
SiO 2 /Al 2 O 3 of not less than 10 and not higher than 25;
OH/SiO 2 of not less than 0.25 and less than 0.40;
Alkali metal/SiO 2 of not less than 0.25 and less than 0.40;
1,3-Di(1-adamantyl)imidazolium cation/SiO 2 of not less than 0.02 and less than 0.20; and
H 2 O/SiO 2 ratio of not less than 5 and less than 60.

12. A catalyst containing the AFX zeolite according to claim 1 .

13. A reduction and removal method for nitrogen oxides comprising contacting a gas containing a nitrogen oxide with the AFX zeolite according to claim 1 .

Assignees

• Tosoh Corp

Inventors

• Naraki Yusuke

Classifications

• B01J29/70

  of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 · CPC title

• B01D53/86

  Catalytic processes · CPC title

• C01B39/026 Primary

  After-treatment · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• B01J29/76 Primary

  Iron group metals or copper · CPC title