Porous silica and deodorant comprising the same

Patent metadata

Field	Value
Publication number	US-11090403-B2
Application number	US-201615745244-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Jul 17, 2015
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

To provide a porous silica which is capable of effectively eliminating odors of methyl mercaptan, hydrogen sulfide, nonenal and the like, said odors being difficult to be eliminated by a silica porous material that contains no metal. A porous silica containing particles that are provided with primary pores, wherein the particles contain a metal containing substance complex having a particle size of 1-100 nm. This porous silica has a specific surface area of 500 m 2 /g or more.

First claim

The invention claimed is:

1. A porous silica comprising:
primary particles each of which has a primary pore with a primary pore size of 1 to 20 nm,
a secondary pore formed by a particle gap between the primary particles, and
a metal containing substance having a particle size of 1 to 100 nm,
wherein the porous silica has a specific surface area of 500 m 2 /g or more,
wherein the metal containing substance is preferentially distributed and localized inside the pores of the porous silica without the metal being doped into a SiO 4 backbone,
wherein the metal containing substance is not present on the outer surface of the porous silica,
wherein the metal is cobalt,
wherein a metal particle rate is 70% or more,
the metal particle rate is a proportion of a mass of the metal inside the pores of the porous silica without being doped therewith, to a total mass of the metal,
wherein a silanol group is present on a pore surface,
wherein the porous silica further comprises aluminum,
an aluminum content in the porous silica is 1.0 wt % or more,
an aluminum particle rate is 0.5% or less, and
the aluminum particle rate is a proportion of a mass of aluminum supported on the porous silica without being doped therewith, to a total mass of aluminum.

2. The porous silica according to claim 1 , wherein the primary particle is a particle where a primary pore is formed by arrangement of a silica precursor in an aqueous solution by use of a fatty acid metal salt and a surfactant as templates, and the metal containing substance is derived from the fatty acid metal salt.

3. The porous silica according to claim 1 , wherein
a cobalt content in the porous silica is 0.5 wt % or more.

4. The porous silica according to claim 1 , wherein
a lightness of the porous silica is 70 or more.

5. The porous silica according to claim 4 , wherein a specific surface area after a hydrothermal treatment at 120° C. for 20 minutes is 1000 m 2 /g or more.

6. A deodorant comprising the porous silica according to claim 1 .

7. The porous silica according to claim 1 , wherein a spherical silica wall is formed on the outer surface of the porous silica.

8. The porous silica according to claim 1 , wherein the metal containing substance has a particle size of less than 20 nm.

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Ohashi Kazuaki
• Kimura Mariko

Classifications

• C01B37/02

  Crystalline silica-polymorphs, e.g. silicalites {dealuminated aluminosilicate zeolites} · CPC title

• B01J20/28

  characterised by their form or physical properties · CPC title

• B01J20/30

  Processes for preparing, regenerating, or reactivating · CPC title

• A61L9/16

  using physical phenomena · CPC title

• A61L9/01

  Deodorant compositions {(compositions released by contact with a liquid A61L9/05)} · CPC title