Honeycomb catalyst body

Patent metadata

Field	Value
Publication number	US-9844768-B2
Application number	US-201615175256-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Mar 29, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

The honeycomb catalyst body is equipped with a honeycomb structure body having partition walls that define a plurality of cells extending from a first end face as one of the end faces to a second end face as the other end face and serving as through channels of a fluid. The partition walls each have a base layer containing from 50 to 90 mass % of zeolite and a coat layer with which the surface of the base layer 11 is coated with a thickness of from 1 to 50 μm. The coat layer is either a coat layer (A) containing from 1 to 5 mass % vanadia and titania or a coat layer (B) containing from 1 to 5 mass % vanadia and a composite oxide of titania and tungsten oxide.

First claim

What is claimed is:

1. A honeycomb catalyst body comprising:
a honeycomb structural body having partition walls that define a plurality of cells extending from a first end face as one of the end faces to a second end face as the other end face, and serving as through channels of a fluid,
the partition walls each having a support layer composed of 50 mass % or more of ceramic, an intermediate layer with which the surface of the support layer is coated and that contains from 50 to 95 mass % of zeolite, and a coat layer with which the surface of the intermediate layer is coated, and
the coat layer being either a coat layer (A) containing vanadia and titania, or a coat layer (B) containing vanadia and a composite oxide of titania and tungsten oxide, wherein the coat layer contains from 1 to 5 mass % vanadia and has a thickness of from 1 μm to 50 μm.

2. The honeycomb catalyst body according to claim 1 ,
wherein the honeycomb structure body has an effective GSA (geometrical surface area) of from 10 to 50 cm 2 /cm 3 .

3. The honeycomb catalyst body according to claim 2 , wherein a ratio of the mass of the zeolite to a total of the mass of the vanadia and the mass of the titania in the coat layer (A) {(mass of zeolite):(total of mass of vanadia and mass of titania)} contained in the honeycomb structure body is from 99:1 to 60:40; or a ratio of the mass of the zeolite to a total of the mass of the vanadia, the mass of the titania, and the mass of the tungsten oxide in the coat layer (B) {(mass of zeolite):(total of mass of vanadia, mass of titania, and mass of tungsten oxide)} contained in the honeycomb structure body is from 99:1 to 60:40.

4. The honeycomb catalyst body according to claim 3 ,
wherein the honeycomb structure body has a thermal expansion coefficient at from 40 to 800° C. of 1.0 ppm/K or less.

5. The honeycomb catalyst body according to claim 2 ,
wherein the honeycomb structure body has a thermal expansion coefficient at from 40 to 800° C. of 1.0 ppm/K or less.

6. The honeycomb catalyst body according to claim 1 , wherein a ratio of the mass of the zeolite to a total of the mass of the vanadia and the mass of the titania in the coat layer (A) {(mass of zeolite):(total of mass of vanadia and mass of titania)} contained in the honeycomb structure body is from 99:1 to 60:40; or a ratio of the mass of the zeolite to a total of the mass of the vanadia, the mass of the titania, and the mass of the tungsten oxide in the coat layer (B) {(mass of zeolite):(total of mass of vanadia, mass of titania, and mass of tungsten oxide)} contained in the honeycomb structure body is from 99:1 to 60:40.

7. The honeycomb catalyst body according to claim 6 ,
wherein the honeycomb structure body has a thermal expansion coefficient at from 40 to 800° C. of 1.0 ppm/K or less.

8. The honeycomb catalyst body according to claim 1 ,
wherein the honeycomb structure body has a thermal expansion coefficient at from 40 to 800° C. of 1.0 ppm/K or less.

9. The honeycomb catalyst body according to claim 1 ,
wherein the coat layer contains from 1 to 30 mass % of an inorganic binder that does not disappear at 500° C. or less.

Assignees

• Ngk Insulators Ltd

Inventors

• Suenobu Hiroyuki
• Hirose Shogo

Classifications

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/57

  Honeycombs · CPC title

• B01J35/395

  Thickness of the active catalytic layer · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title

• B01J21/16

  Clays or other mineral silicates · CPC title