Catalytic system for the treatment of an exhaust gas of a combustion engine

A process for preparing a system for the treatment of an exhaust gas of a diesel combustion engine, comprising

• (1) providing an NOx adsorber component, a diesel oxidation catalyst (DOC) component, a selective catalytic reduction (SCR) component, a gas heating component, and a reductant injector,
• wherein the NOx adsorber component is comprised in
• (i) a catalyst which comprises
• (i.1) a first substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end of the first substrate, and a plurality of passages defined by internal walls of the first substrate extending therethrough;
• (i.2) an NOx adsorber coating being said NOx adsorber component, said coating being disposed on the surface of the internal walls of the first substrate over at least 50% of the substrate axial length of the first substrate, the NOx adsorber coating comprising a platinum group metal component and a 10-membered ring pore zeolitic material having a framework type selected from the group consisting of FER, TON, MTT, SZR, MWW, AEL, HEU, AFO, a mixture of two or more thereof and a mixed type of two or more thereof;
• (2) arranging the NOx adsorber component upstream of the gas heating component;
• (3) arranging the reductant injector upstream of the SCR component;
• (4) arranging the gas heating component upstream of the reductant injector;
• (5) arranging the DOC component upstream of the reductant injector;
• (6) arranging the DOC component and the gas heating component in directly consecutive order.