NH OVERDOSING-TOLERANT SCR CATALYST Russian patent published in 2020 - IPC B01D53/94 B01D53/86 B01D53/58 B01J23/40 B01J23/42 B01J23/54 B01J23/89 B01J29/00 B01J29/76 B01J29/68 B01J29/72 B01J29/76 F01N3/20 F01N3/28 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst for selective catalytic reduction (SCR) of articles containing SCR catalysts and methods of making and using such articles for reducing nitrogen oxides. Catalyst article comprises a substrate having an inlet and an outlet and coated with a first coating comprising a mixture of platinum on a support with low ammonia accumulation and a first SCR catalyst, a second coating containing a second SCR catalyst, wherein the second coating at least partially overlaps the first coating. First SCR catalyst is a Cu-SCR or Fe-SCR catalyst. Carrier is zeolite with ratio of silicon dioxide to aluminium oxide of at least ≥100.

EFFECT: invention improves nitrogen output and reduces formation of nitrogen oxides.

14 cl, 12 dwg