Cluster-supporting porous carrier and method for producing same

Patent metadata

Field	Value
Publication number	US-11673126-B2
Application number	US-201816620055-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 27, 2017
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

There is provided a cluster-supporting porous carrier having improved heat resistance and/or catalytic activity, and a method for producing it. The cluster-supporting porous carrier of the invention has porous carrier particles (20) such as zeolite particles, and metal oxide clusters (16) supported within the pores of the porous carrier particles. The method of the invention for producing the cluster-supporting porous carrier includes providing a dispersion containing a dispersing medium (11) and porous carrier particles dispersed in the dispersing medium, forming positively charged metal oxide clusters (16) in the dispersion, and supporting the metal oxide clusters within the pores of the porous carrier particles (20) by electrostatic interaction.

First claim

The invention claimed is:

1. A method for producing a cluster-supporting porous carrier, wherein:
the cluster-supporting porous carrier has porous carrier particles and metal oxide clusters supported within the pores of the porous carrier particles, and
the method for producing a cluster-supporting porous carrier includes the following steps:
providing a dispersion containing a dispersing medium and porous carrier particles dispersed in the dispersing medium, and
forming positively charged metal oxide clusters in the dispersion by plus-minus inversion or submerged reduction and supporting the metal oxide clusters within the pores of the porous carrier particles by electrostatic interaction,
wherein the metal ion forming the metal oxide is reduced by submerged reduction using a reducing agent to form clusters in the dispersion, and the dispersion is irradiated with plasma and/or microwaves to accelerate reduction by the reducing agent, and
the dispersing medium of the dispersion is an organic solvent having a dielectric constant of 30 or less.

2. The method according to claim 1 , wherein the porous support particles are zeolite particles.

3. The method according to claim 1 , wherein the metal oxide clusters are clusters of a base metal oxide or clusters of a complex metal oxide containing the base metal.

4. The method according to claim 3 , wherein the metal oxide clusters are clusters of an oxide of a metal selected from the group consisting of cerium, zirconium, manganese, molybdenum, vanadium, aluminum and their combinations, or clusters of a complex oxide including such metals.

5. The method according to claim 4 , wherein the metal oxide clusters are selected from the group consisting of ceria-zirconia complex oxide, alumina-ceria-zirconia complex oxide, ceria-zirconia-lanthanum oxide-yttrium oxide complex oxide and alumina-ceria-zirconia-lanthanum oxide-yttrium oxide complex oxide.

6. The method according to claim 1 , which additionally has catalyst metal clusters supported within the pores of the porous carrier particle.

7. The method according to claim 6 , wherein the catalyst metal clusters are selected from the group consisting of rhodium, palladium, platinum or copper clusters, and their combinations.

8. The method according to claim 6 , wherein the catalyst metal clusters are positively charged, and are supported at the acid sites within the pores of the porous support particles by electrostatic interaction.

9. A method for producing a cluster-supporting porous support, wherein the method includes:
mixing the cluster-supporting porous support produced by the method according to claim 1 and a metal cluster-supporting porous support, wherein
the metal cluster-supporting porous support has porous support particles and catalyst metal clusters supported within the pores of the porous support particles.

Assignees

• Toyota Motor Co Ltd
• Genesis Res Institute Inc

Inventors

• Takeda Yoshihiro
• Toyama Namiki
• Egashira Kazuhiro
• Tanaka Toshiaki
• Ito Seitoku
• Ichihashi Masahiko

Classifications

• B01D53/94

  by catalytic processes · CPC title

• B01J37/349

  making use of flames, plasmas or lasers · CPC title

• F01N3/10

  by thermal or catalytic conversion of noxious components of exhaust · CPC title

• B01J29/46

  Iron group metals or copper · CPC title

• B01D53/86

  Catalytic processes · CPC title