SINGLE-UNIT CLOSELY CONNECTED SCR/ASC/PNA/DOC CATALYST Russian patent published in 2021 - IPC B01D53/94 F01N3/20 

FIELD: emission gas purification.

SUBSTANCE: invention relates to a catalytic product for reducing emissions of harmful substances from an exhaust gas stream containing substrate containing an input end and an output end, the first zone, the second zone and the third zone, where the first zone contains the second SCR catalyst, where the second zone contains an ammonia slip catalyst (ASC) containing a mixture of (1) platinum group metal on a carrier and (2) the first SCR catalyst, where the third zone contains a catalyst (“third zone catalyst”) containing a diesel oxidation catalyst (DOC), where the first zone is located upstream of the second zone, and the second zone is located upstream of the third zone; and where the catalytic product contains a passive NOx adsorber (“PNA”). The invention also relates to a method for reducing emissions of harmful substances from the exhaust gas stream.

EFFECT: reducing emissions during the cold start period.

24 cl, 51 dwg, 2 ex