Chabazite zeolite for substrate coating

Patent metadata

Field	Value
Publication number	US-10618040-B2
Application number	US-201716343207-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Oct 25, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

An object of the present invention is to provide a chabazite zeolite which does not easily peel from a substrate such as a honeycomb body even when the substrate has been coated therewith, while exhibiting excellent durability. The present invention relates to a chabazite zeolite for substrate coating, which includes (i) to (iv) below.
(i) Si and Al are contained, (ii) an SiO 2 /Al 2 O 3 molar ratio is in a range of 5<SiO 2 /Al 2 O 3 <10, (iii) an average crystal size is in a range of 0.05 μm<average crystal size<1 μm, and (iv) in a spectrum measured by 27 Al-NMR, a ratio (A NFA /A Total ) between an area (A Total ) of all peaks in the spectrum and an area (A NFA ) of peaks assigned to Al other than tetracoordinated Al is in a range of 20%≤(A NFA /A Total )≤70%.

First claim

The invention claimed is:

1. A chabazite zeolite for substrate coating, wherein:
an SiO 2 /Al 2 O 3 molar ratio is in a range of 5<SiO 2 /Al 2 O 3 <10,
an average crystal size is in a range of 0.05 μm<average crystal size<1 μm, and
in a spectrum measured by 27 Al-NMR, an area range (A NFA /A Total ) between an area (A Total ) of all peaks in the spectrum and an area (A NFA ) of peaks assigned to Al other than tetracoordinated Al is in a range of 20%≤(A NFA /A Total )≤70%, wherein the area range is calculated as A NFA /A total ×100.

2. The chabazite zeolite for substrate coating according to claim 1 , wherein
a standard deviation of a particle size distribution obtained by laser diffraction particle size distribution measurement is of 0.2≤standard deviation.

3. The chabazite zeolite for substrate coating according to claim 1 , wherein an average crystal size is in a range of 0.1 μm≤average crystal size≤0.5 μm.

4. The chabazite zeolite for substrate coating according to claim 3 , wherein an external surface area is in a range of 30 m 2 /g≤external surface area<80 m 2 /g.

5. The chabazite zeolite for substrate coating according to claim 4 , wherein a relative crystallinity to a crystallinity of a reference material synthesized by a manufacturing method of a chabazite zeolite indicated by International Zeolite Association is more than 100%.

6. The chabazite zeolite for substrate coating according claim 1 , which supports Cu or Fe.

7. An automobile exhaust gas purification catalyst containing a substrate coated with the chabazite zeolite according to claim 6 .

8. The chabazite zeolite for substrate coating according to claim 2 , wherein an average crystal size is in a range of 0.1 μm≤average crystal size≤0.5 μm.

9. The chabazite zeolite for substrate coating according to claim 8 , wherein an external surface area is in a range of 30 m 2 /g≤external surface area<80 m 2 /g.

10. The chabazite zeolite for substrate coating according to claim 9 , wherein a relative crystallinity to a crystallinity of a reference material synthesized by a manufacturing method of a chabazite zeolite indicated by International Zeolite Association is more than 100%.

11. The chabazite zeolite for substrate coating according to claim 2 , which supports Cu or Fe.

12. An automobile exhaust gas purification catalyst containing a substrate coated with the chabazite zeolite according to claim 11 .

Assignees

• Jgc Catalysts & Chemicals Ltd

Inventors

• Yamaguchi Yoko
• Tsuruta Shunji
• Nakashima Akira

Classifications

• F01N2510/063

  zeolites · CPC title

• B01J29/7015

  CHA-type, e.g. Chabazite, LZ-218 · CPC title

• B01J2229/16

  to increase the Si/Al ratio; Dealumination · CPC title

• C01B39/026

  After-treatment · CPC title

• B01D53/94

  by catalytic processes · CPC title