Three-way diesel catalyst for cold start technology

A catalyst for the treatment of a diesel exhaust gas, the catalyst comprising

• (i) a substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end of the substrate and a plurality of passages defined by internal walls of the substrate extending therethrough;
• (ii) a first coating disposed on the surface of the internal walls of the substrate and extending over at least 50% of the axial length of the substrate from the inlet end toward the outlet end, wherein the first coating comprises a first platinum group metal component supported on a first oxidic support material, a second platinum group metal component supported on a second oxidic support material, wherein the first platinum group metal component is different to the second platinum group metal component, and a first oxygen storage compound, wherein at least 30 weight-% of the first oxygen storage compound consist of cerium oxide, calculated as CeO2;
• and
• (iii) a second coating extending over at least 50% of the axial length of the substrate from the outlet end toward the inlet end and disposed either on the surface of the internal walls of the substrate, or on the surface of the internal walls of the substrate and the first coating, or on the first coating, wherein the second coating comprises a third platinum group metal component and a fourth platinum group metal component, wherein the third platinum group metal component and the fourth platinum group metal component are supported on a third oxidic support material, and wherein the third platinum group metal component is different to the fourth platinum group metal component.