Oxidation catalyst, catalyst support structure, method of producing oxidation catalyst, and method of producing catalyst support structure

Patent metadata

Field	Value
Publication number	US-10946336-B2
Application number	US-201916295137-A
Country	US
Kind code	B2
Filing date	Mar 7, 2019
Priority date	Mar 22, 2018
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

An oxidation catalyst includes cerium dioxide particles and a metal oxide. The cerium dioxide particles contain an ancillary component that is at least one of lanthanum, aluminum, and iron. The metal oxide contains iron and manganese and is held by the cerium dioxide particles.

First claim

The invention claimed is:

1. An oxidation catalyst comprising:
cerium dioxide particles containing an ancillary component that is at least one of lanthanum, aluminum, and iron; and
a metal oxide containing iron and manganese and held by said cerium dioxide particles;
wherein the ancillary component is agglomerated with the cerium dioxide particles or solid-dissolved in the crystals of the cerium dioxide particles.

2. The oxidation catalyst according to claim 1 , wherein
a mass ratio of said ancillary component to cerium contained in said cerium dioxide particles is in a range of 3 to 45 mass % in terms of oxides.

3. The oxidation catalyst according to claim 2 , wherein
a mass ratio of said metal oxide to a whole of said oxidation catalyst is in a range of 5 to 40 mass %.

4. A catalyst support structure comprising:
a cell structure whose interior is partitioned into a plurality of cells by partition walls; and
the oxidation catalyst according to claim 3 , supported by said partition walls.

5. The catalyst support structure according to claim 4 , wherein a precious metal is not contained.

6. A catalyst support structure comprising:
a cell structure whose interior is partitioned into a plurality of cells by partition walls; and
the oxidation catalyst according to claim 2 , supported by said partition walls.

7. The catalyst support structure according to claim 6 , wherein a precious metal is not contained.

8. The oxidation catalyst according to claim 1 , wherein
a mass ratio of said metal oxide to a whole of said oxidation catalyst is in a range of 5 to 40 mass %.

9. A catalyst support structure comprising:
a cell structure whose interior is partitioned into a plurality of cells by partition walls; and
the oxidation catalyst according to claim 8 , supported by said partition walls.

10. The catalyst support structure according to claim 9 , wherein a precious metal is not contained.

11. A catalyst support structure comprising:
a cell structure whose interior is partitioned into a plurality of cells by partition walls; and
the oxidation catalyst according to claim 1 , supported by said partition walls.

12. The catalyst support structure according to claim 11 , wherein a precious metal is not contained.

13. A method of producing an oxidation catalyst, comprising:
generating cerium dioxide particles containing an ancillary component that is at least one of lanthanum, aluminum, and iron; and
causing said cerium dioxide particles to hold a metal oxide containing iron and manganese;
wherein the ancillary component is agglomerated with the cerium dioxide particles or solid-dissolved in the crystals of the cerium dioxide particles.

14. A method of producing a catalyst support structure, comprising:
a preparation operation of preparing a cell structure whose interior is partitioned into a plurality of cells by partition walls; and
a support operation of causing the oxidation catalyst produced by the method of producing an oxidation catalyst according to claim 13 to be supported by said partition walls.

15. The method of producing a catalyst support structure according to claim 14 , wherein
in said support operation, a fluid in which said oxidation catalyst is dispersed is supplied to said cell structure.

Assignees

• Ngk Insulators Ltd

Inventors

• Izumi Yunie

Classifications

• F01N3/0821

  combined with particulate filter · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title

• B01J37/082

  Decomposition and pyrolysis · CPC title

• B01D2255/2063

  Lanthanum · CPC title

• F01N3/106

  Auxiliary oxidation catalysts · CPC title