Porous ceramic structure

Patent metadata

Field	Value
Publication number	US-11731912-B2
Application number	US-202117444197-A
Country	US
Kind code	B2
Filing date	Aug 2, 2021
Priority date	Sep 3, 2020
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A porous ceramic structure includes a porous honeycomb structure composed primarily of cordierite, and Ce- and Zr-containing particles fixedly attached to the honeycomb structure. The Ce- and Zr-containing particles contain Ce and Zr. The Ce- and Zr-containing particles have a fixedly attached portion located inside the honeycomb structure and a protrusion contiguous with the fixedly attached portion and protruding from the honeycomb structure.

First claim

The invention claimed is:

1. A porous ceramic structure comprising:
a porous structure body composed of higher than or equal to 75% by mass cordierite; and
Ce- and Zr-containing particles containing Ce and Zr and fixedly attached to the structure body,
wherein the Ce- and Zr-containing particles have:
a fixedly attached portion located inside the structure body;
a protrusion contiguous with the fixedly attached portion and protruding from the structure body; and
an open porosity of the porous structure body is higher than or equal to 25%.

2. The porous ceramic structure according to claim 1 , wherein
a total content of Ce and Zr is higher than or equal to 6.0% by mass and lower than or equal to 20% by mass in terms of CeO 2 and ZrO 2 .

3. The porous ceramic structure according to claim 1 , wherein
a Ce content is higher than or equal to 5.0% by mass and lower than or equal to 15% by mass in terms of CeO 2 .

4. The porous ceramic structure according to claim 1 , wherein
a Zr content is higher than or equal to 1.0% by mass and lower than or equal to 5.0% by mass in terms of ZrO 2 .

5. The porous ceramic structure according to claim 1 , wherein
at least part of Ce exists as CeO 2 .

6. The porous ceramic structure according to claim 5 , wherein
at least part of Zr is dissolved as a solid solution in CeO 2 .

7. The porous ceramic structure according to claim 6 , wherein
a ratio of an amount of substance of Zr to a total amount of substances of Ce and Zr in CeO 2 with Zr dissolved therein as a solid solution is higher than or equal to 10% and lower than or equal to 20%.

8. The porous ceramic structure according to claim 1 , wherein
the Ce- and Zr-containing particles have an average particle diameter greater than or equal to 10 nm and less than or equal to 2 μm.

9. The porous ceramic structure according to claim 1 , wherein
catalyst particles are supported by the Ce- and Zr-containing particles.

Assignees

• Ngk Insulators Ltd

Inventors

• Izumi Yunie
• Hidaka Kennichi
• Miura Akihiro

Classifications

• B01J35/56

  Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• C04B38/0009 Primary

  characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls · CPC title

• C04B35/195 Primary

  Alkaline earth aluminosilicates, e.g. cordierite {or anorthite} · CPC title