MANGANESE-CONTAINING DIESEL OXIDATION CATALYST Russian patent published in 2019 - IPC B01J35/04 B01J29/68 B01J23/42 B01J23/44 B01J23/64 B01J37/02 B01D53/94 B01D53/56 F01N3/10 

FIELD: motor vehicles industry.

SUBSTANCE: present invention relates to a composite oxidation catalyst for reducing of content of hydrocarbon and carbon monoxide emissions of exhaust gases and for the oxidation of NO to NO₂ from a lean burn engine, comprising: a carrier substrate having a length, an inlet end, and an outlet end, an oxidation catalyst catalytic material on the carrier, the oxidation catalyst catalytic material including a first washcoat layer comprising a first refractory metal oxide support, a platinum (Pt) component and a palladium (Pd) component in a ratio of Pt:Pd in the range of 10: 1 to 1: 10; and a second washcoat layer comprising a second refractory metal oxide support containing Mn in a range of 0.1 to 30 wt%, a zeolite, a Pt component, and optionally a Pd component. Method for treating a diesel engine exhaust stream using said oxidation catalyst composite and a lean burn engine exhaust treatment system comprising such an oxidation catalyst composite are also described.

EFFECT: development of an improved diesel oxidation catalyst, providing an efficient reduction of hydrocarbon and carbon monoxide and improved oxidation of NO to NO₂, which leads to increased NO₂ content in exhaust gases of a diesel engine, to improved subsequent removal of NO_x from the engine, to improved performance of subsequent catalysts for selective catalytic reduction (SCR).

30 cl, 10 dwg, 16 tbl, 6 ex