EXHAUST SYSTEM FOR INTERNAL COMBUSTION ENGINE WORKING ON POOR MIXTURE, WHICH CONTAINS Pd-Au ALLOY-BASED CATALYST Russian patent published in 2014 - IPC B01D53/94 B01J23/44 B01J23/52 

FIELD: chemistry.

SUBSTANCE: invention relates to device which includes internal combustion engine, working on poor mixture, for instance, engine with ignition from compression (Diesel) or petrol engine, working on poor mixture, and exhaust system, containing one or several catalytic components for afterpurification. One or more catalytic components for afterpurification include catalytic composition, containing alloy, which consists of palladium and gold, on first metal oxide carrier, and platinum, placed on separate metal oxide carrier, different from carrier with alloy of palladium and gold. Platinum on second metal oxide carrier is located in the layer under upper layer, containing palladium-gold alloy on first metal oxide carrier. Atomic ratio Au:Pd in catalytic composition constitutes from 9:1 to 1:9. Method of producing catalytic composition includes stages of application of oxide coating, which contains platinum salt and metal oxide carrier, on substrate monolith, drying with further calcinations of substrate monolith with applied coating, obtaining oxide coating, which contains Pd:Au alloy, preliminarily fixed on metal oxide carrier, and application of upper layer of coating from oxide, which contains applied on carrier Pd:Au alloy, on underlying layer of platinum applied on carrier.

EFFECT: catalytic composition has good reaction ability with respect to nitrogen oxide and hydrocarbons and excellent resistance to sulphur.

11 cl, 4 dwg, 5 tbl, 9 ex