Multi-region TWC for treatment of exhaust gas from gasoline engine

A catalyst article for treating exhaust gas comprising:

• a substrate comprising an inlet end, an outlet end with an axial length L;
• a first catalytic region beginning at the inlet end and extending for 30 to 70 percent of the axial length L, wherein the first catalytic region comprises a first palladium component and a first oxygen storage capacity (OSC) material;
• a second catalytic region beginning at the outlet end and extending for 30 to 70 percent of the axial length L, wherein the second catalytic region comprises a second palladium component and a second OSC material;
• a third catalytic region beginning at the outlet end and extending for 50 to 95 percent of the axial length L, wherein the third catalytic region comprises a third rhodium component;
• wherein the third catalytic region overlies the second catalytic region;
• and
• wherein the first palladium component and the second palladium component have a weight ratio of greater than 1:1.