SOLID SUBSTRATE WITH SCR CATALYST Russian patent published in 2017 - IPC B01J23/38 B01J33/00 B01J35/04 F01N3/08 F01N3/20 B01J35/00 B01D53/94 

FIELD: engines.

SUBSTANCE: invention relates to operating on lean mixtures automotive internal combustion engine exhaust system, wherein system includes: (1) catalyzed solid substrate, containing catalyst arranged along flow to solid substrate, wherein said catalyst contains, at least, one platinum group metal (PGM) and which contains platinum (Pt) and palladium (Pd) in weight ratio Pt:Pd≥1.25:1, and (2) solid substrate having length L and including first zone, substantially, with constant length, restricted on one end with solid substrate first end, wherein first zone comprises selective catalytic reduction (SCR) catalyst, intended for nitrogen oxides in exhaust gas reducing with nitrous reducer, emitted by internal combustion engine, and second zone, substantially, with constant length, which is less than L, restricted on one end with solid substrate second end, wherein solid substrate second end is oriented in upstream side direction and wherein: (a) second zone consists of, at least, one metal oxide in form of particles or mixture of any two or more metal oxides, intended for gas-phase platinum group metal (PGM) collection, wherein said, at least, one metal oxide in form of particles is selected from group, consisting of optionally stabilized aluminium oxide, amorphous aluminosilicate, optionally stabilized zirconium oxide, titanium oxide and mixtures of any two or several of them, wherein said, at least, one metal oxide in form of particles is not serving as substrate for any other catalytic component; or (b) second zone contains component capable of trapping and/or interfusing with gas-phase of platinum group metal (PGM) and which contains: (i) metal selected from group consisting of gold and silver, or (ii) mixture or alloy of palladium and gold. Invention also relates to engine with compression ignition and automobile, including such engine.

EFFECT: technical result consists in reducing or preventing of selective catalytic reduction (SCR) catalyst poisoning with platinum group metal (PGM).

17 cl, 4 dwg, 8 ex