Exhaust gas purification catalyst composition and exhaust gas purification catalyst

Patent metadata

Field	Value
Publication number	US-9682365-B2
Application number	US-201414891553-A
Country	US
Kind code	B2
Filing date	Apr 17, 2014
Priority date	May 17, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Provided is a new catalyst that can have heightened purification performance for NOx under lean conditions. Proposed is an exhaust gas purification catalyst composition provided with: a carrier (A) comprising zirconium phosphate; a catalyst active component (a) supported on the carrier (A); a carrier (B) comprising an inorganic oxide porous body; and a catalyst active component (b) supported on the carrier (B).

First claim

The invention claimed is:

1. An exhaust gas purification catalyst composition comprising:
a carrier A comprising a zirconium phosphate;
a catalytically active component (a) supported on the carrier A;
a carrier B comprising an inorganic oxide porous material; and
a catalytically active component (b) supported on the carrier B,
wherein the carrier B is one or more inorganic oxide porous materials selected from a group consisting of silica, silica-alumina, ceria-zirconia, lanthanum, alumina, alumino-silicate, alumina-zirconia, alumina-chromia, alumina-ceria titania, and titania,
the catalytically active component (a) comprises Rh,
50% or more of the catalytically active component (a) is supported on the carrier A, and
50% or more of the catalytically active component (b) is supported on the carrier B.

2. The exhaust gas purification catalyst composition according to claim 1 , wherein the carrier B contains an oxide porous material having a Hammett acidity function H 0max of −10<H 0max <15.

3. The exhaust gas purification catalyst composition according to claim 1 , wherein the catalytically active component (b) supported on the carrier B is Pt.

4. The exhaust gas purification catalyst composition according to claim 1 , wherein the catalytically active component (a) supported on the carrier A consists of Rh.

5. An exhaust gas purification catalyst having a structure in which the exhaust gas purification catalyst composition according to claim 1 is supported on a substrate.

6. An exhaust gas purification catalyst having a structure in which the exhaust gas purification catalyst composition according to claim 1 is formed into a pellet shape.

7. The exhaust gas purification catalyst composition according to claim 1 , wherein the carrier B is one or more inorganic oxide porous materials selected from a group consisting of ceria-zirconia, lanthanum, alumina-zirconia, alumina-chromia, and alumina-ceria titania.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Nagao Yuki
• Iwakura Hironori
• Nakahara Yunosuke
• Machida Masato

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/56

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

• B01D2255/1025

  Rhodium · CPC title

• B01J2523/828

  Platinum · CPC title

• B01D2255/908

  O2-storage component incorporated in the catalyst · CPC title