EXHAUST SYSTEM WITH MODIFIED NO TRAP UNDER LEAN MIXTURE CONDITIONS Russian patent published in 2019 - IPC F01N3/20 

FIELD: machine building.

SUBSTANCE: described is an exhaust system for processing exhaust gases of an internal combustion engine. System includes modified NO_x trap under lean mixture conditions (lean NO_x trap – LNT), urea injection system and ammonia-selective catalytic reduction catalyst. Modified LNT comprises a first layer and a second layer. First layer comprises NO_x adsorbent component and one or more platinum group metals. Second layer includes a diesel oxidation catalyst zone and an NO oxidation zone. Diesel oxidation catalyst zone comprises platinum group metal, zeolite and, optionally, alkali-earth metal. NO oxidation zone includes platinum group metal and carrier. Modified LNT accumulates NO_x at temperature less than approximately 200 °C and releases at temperature of more than about 200 °C. Also, modified LNT and method of using modified LNT are described.

EFFECT: disclosed is a modified trap with trap NO_x in conditions of lean mixture.

19 cl, 2 dwg