Exhaust gas-purifying catalyst

Patent metadata

Field	Value
Publication number	US-9855550-B2
Application number	US-201715410889-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jan 21, 2016
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An exhaust gas-purifying catalyst includes a support and a catalytic metal as one or more precious metals supported by the support. The support includes a composite oxide having a composition represented by a general formula AB α C β O 3 , wherein A represents one or more elements selected from the group consisting of lanthanum, neodymium, and yttrium, B represents iron or a combination of iron and aluminum, C represents one or more elements selected from the group consisting of iridium, ruthenium, tantalum, niobium, molybdenum, and tungsten, α and β each represents a numerical value within a range of more than 0 and less than 1, and α and β satisfy relational formulae of β>α and α+β≦1.

First claim

What is claimed is:

1. An exhaust gas-purifying catalyst comprising:
a support including a composite oxide having a composition represented by a general formula AB α C β O 3 , wherein A represents one or more elements selected from the group consisting of lanthanum, neodymium, and yttrium, B represents iron or a combination of iron and aluminum, C represents one or more elements selected from the group consisting of iridium, ruthenium, tantalum, niobium, molybdenum, and tungsten, α and β each represents a numerical value within a range of more than 0 and less than 1, and α and β satisfy relational formulae ofβ<α and α+β≦1; and
a catalytic metal as one or more precious metals supported by the support,
wherein α is within a range of 0.7 to 0.9995, and β is within a range of 0.000475 to 0.201.

2. The exhaust gas-purifying catalyst according to claim 1 , wherein a proportion of an amount of the element C contained in the composite oxide in a total amount of the element C contained in the exhaust gas-purifying catalyst is 20 atomic % or more.

3. The exhaust gas-purifying catalyst according to claim 1 , wherein the composite oxide contains a compound having a perovskite structure.

4. The exhaust gas-purifying catalyst according to claim 1 , wherein the catalytic metal contains palladium.

Assignees

• Cataler Corp

Inventors

• Matsueda Satoshi
• Hirai Akimasa
• Taki Kenichi
• Hoshino Sho

Classifications

• B01J23/42

  Platinum · CPC title

• B01D2255/1023

  Palladium · CPC title

• B01D2255/2068

  Neodymium · CPC title

• B01J23/894 Primary

  with rare earths or actinides · CPC title

• B01D2255/20769

  Molybdenum · CPC title