US 12,350,653 B2 · Exhaust gas purification catalyst

Abstract

An object of the present invention is to provide an exhaust gas purification catalyst having improved exhaust gas (e.g., NOx) purifying performance at low to medium temperature. In order to achieve the object, the present invention provides an exhaust gas purification catalyst including: a substrate; and a catalyst layer formed on the substrate, wherein the catalyst layer contains rhodium element, phosphorus element and a rare earth element other than cerium element, wherein a ratio of a mass of the phosphorus element contained in the catalyst layer to the mass of the rhodium element contained in the catalyst layer is from 1 to 10, and wherein a ratio of a mass of the rare earth element other than cerium element in terms of an oxide thereof contained in the catalyst layer to the mass of the rhodium element contained in the catalyst layer is from 1 to 5.

Claims8

Dependent claims

An exhaust gas purification catalyst, comprising:

a substrate;
and
a catalyst layer formed on the substrate,
wherein the catalyst layer contains rhodium element, phosphorus element and a rare earth element other than cerium element,
wherein a ratio of a mass of the phosphorus element in terms of the phosphorus element contained in the catalyst layer to a mass of the rhodium element in terms of the rhodium element contained in the catalyst layer is from 1.0 to 10,
wherein a ratio of a mass of the rare earth element other than cerium element in terms of an oxide thereof contained in the catalyst layer to the mass of the rhodium element in terms of the rhodium element contained in the catalyst layer is from 1.0 to 5.0, and
wherein the catalyst layer does not contain any noble metal element other than the rhodium element.

4 more elements

Dependencies are inferred from the claim text.

Exhaust gas purification catalyst

Life of this patent

Exhaust gas purification catalyst

Life of this patent

Abstract

Claims8