EXHAUST SYSTEM COMPRISING PASSIVE NO-ABSORBER Russian patent published in 2020 - IPC F01N3/08 F01N3/20 

FIELD: machine building.

SUBSTANCE: exhaust system for treatment of exhaust gas formed by engine running on lean mixture, including: (i) a NO_x-absorber (PNA 10) catalyst comprising a molecular sieve catalyst placed on a substrate, in which the molecular sieve catalyst contains a noble metal and a molecular sieve, wherein the molecular sieve contains a noble metal; (ii) device (20) for introducing hydrocarbons into exhaust gas; and (iii) NO_x depleted trap (LNT/NSC 30); wherein the NO_x-absorber catalyst located upstream of the hydrocarbon for introduction device to the exhaust gas and traps the lean NO_x.

EFFECT: by including both a PNA and an LNT in an exhaust system, it is possible to store NO_x over a broader temperature window.

17 cl, 2 dwg