Automotive 3-way catalyst system containing a tail pipe catalyst

An automotive catalyst system comprising:

• a) a first close coupled three-way conversion catalytic article in fluid communication with an engine exhaust outlet, wherein the three-way conversion catalytic article comprises i) a first platinum group metal supported on a first support, and ii) a first substrate;
• b) a catalytic article located downstream of and in fluid communication with the first close coupled three-way conversion catalytic article, wherein the catalytic article comprises i) a second platinum group metal supported on a second support, and ii) a second substrate;
• c) a tail-pipe catalytic article comprising i) a third platinum group metal, a non-platinum group metal, or both, supported on one of ceria-zirconia, ceria, ceria-alumina, lanthana-zirconia, alumina-zirconia, a mixture of alumina and ceria, and a mixture of alumina and ceria-zirconia;
• and ii) a third substrate,
• wherein the loading of the third platinum group metal, if present, ranges from 1.0 g/ft3 to 10.0 g/ft3;
• wherein the non-platinum group metal, if present, is selected from nickel, copper, iron, manganese, and combination thereof, supported on a support, wherein the support is chosen from ceria component, zirconia component, and oxygen storage component, wherein the amount of the non-platinum group metal ranges from 0.1 wt. % to 15 wt. %;
• and
• wherein the tail-pipe catalytic article (c) is arranged downstream in fluid communication and from 1.0 foot to 10 feet away from the catalytic article (b) at a position chosen from before or behind a resonator, before or after a muffler, between the resonator and the muffler, inside the muffler, inside the resonator, and at a tail pipe end.