Exhaust gas purifying catalyst composition and exhaust gas purifying catalyst

Patent metadata

Field	Value
Publication number	US-9533290-B2
Application number	US-201414255127-A
Country	US
Kind code	B2
Filing date	Apr 17, 2014
Priority date	Apr 18, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Provided is a catalyst composition using other metals different from noble metals as a catalytic activity component and which has an excellent catalytic activity even after a thermal duration treatment. Provided are an exhaust gas purifying catalyst composition which includes ceria-zirconia particles with a feature in that a peak arising from (111) plane is divided into two peak tops in an XRD pattern and in which a transition metal including at least one of Cu, Cr, Fe, Mn, Co, Ni, and Ag is supported on the ceria-zirconia particles, and a catalyst using the exhaust gas purifying catalyst composition.

First claim

The invention claimed is:

1. An exhaust gas purifying catalyst composition comprising ceria-zirconia particles with a feature in that a peak arising from (111) plane is divided into two peak tops in an XRD pattern, wherein the ceria-zirconia particles have a mass ratio of CeO 2 to ZrO 2 of 5:95 to 50:50,
wherein a transition metal including at least one of Cu, Cr, Fe, Mn, Co, Ni, and Ag is supported on the ceria-zirconia particles wherein Cu and a transition metal A including Mn, Cu, and a transition metal including at least one of Cr, Fe, Co, Ni, and Ag are supported on the ceria-zirconia particles.

2. The exhaust gas purifying catalyst composition according to claim 1 , wherein Cu and a transition metal A including Mn, Cu and a transition metal A including Cr, or Cu and a transition metal A including Fe are supported on the ceria-zirconia particles.

3. The exhaust gas purifying catalyst composition according to claim 1 , wherein Cu and said transition metal A form composite oxides to be supported on the ceria-zirconia particles.

4. The exhaust gas purifying catalyst composition according to claim 1 , wherein said transition metal A is contained at a rate of 0.05 to 20 mass % relative to a content of Cu, as determined from the following Formula-(3),
Content rate of transition metal A={amount of transition metal A/(amount of ceria-zirconia particles+amount of Cu+amount of transition metal A)}×100.

5. An exhaust gas purifying catalyst in which the exhaust gas purifying catalyst composition according to claim 1 is supported on a honeycomb substrate.

6. An exhaust gas purifying catalyst in which the exhaust gas purifying catalyst composition according to claim 1 is formed in a pellet shape.

7. The exhaust gas purifying catalyst composition according to claim 2 , wherein Cu and said transition metal A including Mn, Cu and said transition metal A including Cr, or Cu and said transition metal A including Fe are supported on the ceria-zirconia particles.

8. The exhaust gas purifying catalyst composition according to claim 2 , wherein Cu and said transition metal A form composite oxides to be supported on the ceria-zirconia particles.

9. The exhaust gas purifying catalyst composition according to claim 2 , wherein said transition metal A is contained at a rate of 0.05 to 20 mass % relative to a content of Cu, as determined from the following Formula-(3),
Content rate of transition metal A={amount of transition metal A/(amount of ceria-zirconia particles+amount of Cu+amount of transition metal A)}×100.

10. The exhaust gas purifying catalyst composition according to claim 3 , wherein said transition metal A is contained at a rate of 0.05 to 20 mass % relative to a content of Cu, as determined from the following Formula-(3),
Content rate of transition metal A={amount of transition metal A/(amount of ceria-zirconia particles+amount of Cu+amount of transition metal A)}×100.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Nagao Yuki
• Ogawa Makoto
• Oshima Ryoichi
• Houshito Ohki
• Nakahara Yunosuke

Classifications

• B01J35/30

  characterised by their physical properties · CPC title

• B01J23/83

  with rare earths or actinides · CPC title

• F01N3/103

  Oxidation catalysts for HC and CO only · CPC title

• B01J23/26

  Chromium · CPC title

• B01J23/868

  copper and chromium · CPC title