US 11,872,540 B2 · Exhaust gas purification catalyst composition and exhaust gas purification catalyst

Abstract

An object of the present invention is to provide an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which includes a pyrochlore-type CeO2—ZrO2-based complex oxide having an improved oxygen storage capacity (particularly, an improved oxygen storage capacity after being exposed to a high temperature environment), and, in order to achieve the above-mentioned object, the present invention provides an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which contains a pyrochlore-type CeO2—ZrO2-based complex oxide that contains Y and Mg and thus exhibits an excellent oxygen storage capacity (particularly, an excellent oxygen storage capacity after being exposed to a high temperature environment).

Claims15

Dependent claims

A composition, comprising:

a pyrochlore-type CeO2—ZrO2-based complex oxide comprising Y and Mg;
and
a catalytically-active component comprising a noble metal element,
wherein, in the pyrochlore-type CeO2—ZrO2-based complex oxide, a mole percentage R2 of a total content of Y and Mg to a total content of Ce, Zr, Y and Mg is 5.5% by mole or more and 20% by mole or less, and a mole ratio R3 of a content of Mg to a content of Y is 0.1 or more and 2.6 or less, and
wherein the composition is a composition for producing an exhaust gas purification catalyst comprising the pyrochlore-type CeO2—ZrO2-based complex oxide, and the catalytically-active component supported on the pyrochlore-type CeO2—ZrO2-based complex oxide.

2 more elements

Dependencies are inferred from the claim text.

Exhaust gas purification catalyst composition and exhaust gas purification catalyst

Life of this patent

Exhaust gas purification catalyst composition and exhaust gas purification catalyst

Life of this patent

Abstract

Claims15