Gas adsorbent and vacuum thermal insulation material including gas adsorbent

Patent metadata

Field	Value
Publication number	US-9968907-B2
Application number	US-201615504757-A
Country	US
Kind code	B2
Filing date	Aug 25, 2016
Priority date	Sep 3, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A gas adsorbent includes copper-exchanged ZSM-5 zeolite, and the crystallinity of the copper-exchanged ZSM-5 zeolite is set to at least 40% and up to 80%.

First claim

The invention claimed is:

1. A gas adsorbent, comprising
copper-exchanged ZSM-5 zeolite, wherein:
crystallinity of the copper-exchanged ZSM-5 zeolite is set to at least 40% and up to 80%, and
the copper-exchanged ZSM-5 zeolite has a Si/Al ratio of at least 10 and up to 20.

2. The gas adsorbent according to claim 1 , wherein
the crystallinity of the copper-exchanged ZSM-5 zeolite is set to at least 50% and up to 75%.

3. The gas adsorbent according to claim 1 , wherein
the crystallinity of the copper-exchanged ZSM-5 zeolite is calculated using a ratio of peak intensity of the copper-exchanged ZSM-5 zeolite to peak intensity of Na—, H—, or NH4-ZSM-5 zeolite having a Si/Al ratio substantially equal to a Si/Al ratio of the copper-exchanged ZSM-5 zeolite, where the peak intensity of Na—, H—, or NH4-ZSM-5 zeolite having the Si/Al ratio substantially equal to the Si/Al ratio of the copper-exchanged ZSM-5 zeolite is defined as 100%, the peak intensity being intensity of a peak having highest intensity among peaks detected at 2θ=22.8° to 23.8° in X-ray diffraction of each of the copper-exchanged ZSM-5 zeolite and the Na—, H—, or NH4-ZSM-5 zeolite having the Si/Al ratio substantially equal to the Si/Al ratio of the copper-exchanged ZSM-5 zeolite.

4. The gas adsorbent according to claim 3 , wherein
the copper-exchanged ZSM-5 zeolite has a copper exchange rate of at least 130% and less than 200%.

5. A vacuum thermal insulation material, comprising:
at least an outer coating;
a core; and
a gas adsorbent, wherein
as the gas adsorbent, the gas adsorbent claim 4 is used.

6. A vacuum thermal insulation material, comprising:
at least an outer coating;
a core; and
a gas adsorbent, wherein
as the gas adsorbent, the gas adsorbent claim 3 is used.

7. The gas adsorbent according to claim 1 , wherein
the copper-exchanged ZSM-5 zeolite has a copper exchange rate of at least 130% and less than 200%.

8. A vacuum thermal insulation material, comprising:
at least an outer coating;
a core; and
a gas adsorbent, wherein
as the gas adsorbent, the gas adsorbent claim 7 is used.

9. The gas adsorbent according to claim 1 , wherein the Si/Al ratio of a surface portion of the copper-exchanged ZSM-5 zeolite is smaller than the Si/Al ratio of portions other than the surface portion of the copper-exchanged ZSM-5 zeolite.

10. A vacuum thermal insulation material, comprising:
at least an outer coating;
a core; and
a gas adsorbent, wherein
as the gas adsorbent, the gas adsorbent according to claim 1 is used.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Akeyama Yukako

Classifications

• B01J20/18 Primary

  Synthetic zeolitic molecular sieves · CPC title

• B01D2257/10

  Single element gases other than halogens · CPC title

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01J20/28

  characterised by their form or physical properties · CPC title

• F16L59/065

  using vacuum (F16L59/075 takes precedence) · CPC title