Exhaust gas treatment system including a multifunctional catalyst

An exhaust gas treatment system for treating an exhaust gas stream exiting a diesel engine, said exhaust gas treatment system having an upstream end for introducing said exhaust gas stream into said exhaust gas treatment system, wherein said exhaust gas treatment system comprises;

• (i) a first catalyst having an inlet end and an outlet end and comprising a coating disposed on a first substrate, wherein the coating comprises palladium supported on an oxidic material comprising zirconium and further comprises one or more of a vanadium oxide and a first zeolitic material comprising one or more of copper and iron;
• (ii) a second catalyst having an inlet end and an outlet end and comprising a coating disposed on a second substrate, wherein the coating comprises one or more of a vanadium oxide and a second zeolitic material comprising one or more of copper and iron, wherein at most 0.0001 weight-% of the coating of the second catalyst consists of platinum group metal;
• wherein the first catalyst according to (i) is located downstream of the upstream end of the exhaust gas treatment system and wherein the inlet end of the first catalyst is arranged upstream of the outlet end of the first catalyst;
• wherein in the exhaust gas treatment system, the second catalyst according to (ii) is located downstream of the first catalyst according to (i) and wherein the inlet end of the second catalyst is arranged upstream of the outlet end of the second catalyst.