EXHAUST SYSTEM OF INTERNAL COMBUSTION ENGINE WITH INCOMPLETE COMBUSTION, CONTAINING SCR CATALYST

FIELD: engines and pumps.SUBSTANCE: exhaust system comprises the first catalysed carrier monolith comprising the first thin-layer coating located in the first thin-layer area of the carrier monolith, where the thin-layer coating contains a catalytic composition containing at least one platinum group metal and at least one carrier material, wherein at least one platinum group metal in the first thin-layer coating is susceptible to volatilization, when the thin-layer coating is maintained at the temperature of ≥700°C, and the second thin-layer coating located in the second thin-layer area of the carrier monolith, wherein the second thin-layer coating contains at least one copper-carrying material for trapping the volatilized platinum group metal, wherein at least one carrier material represents at least one metal oxide, a molecular sieve, or a mixture of any two or more of them, and when at least one carrier material represents at least one metal oxide, at least one metal-oxide carrier is selected from the group consisting of optionally stabilised aluminium oxide, amorphous silicon dioxide-aluminium oxide, optionally stabilised zirconium oxide, titanium oxide, optionally stabilized mixed cerium oxide-zirconium oxide and mixtures of two or more of them, and wherein the second thin-layer coating is oriented to contact with the exhaust gas that had contact with the first thin-layer coating, and b) the second catalysed carrier monolith containing the catalyst to selectively catalyze the reduction of nitrogen oxides to molecular nitrogen with a nitrogen reductant, located downstream from the first catalysed carrier monolith.EFFECT: preventing the volatilization of relatively low levels of platinum group metals from the components upstream of the SCR catalyst.19 cl, 5 dwg, 9 ex Изобретение относится к выхлопной системе двигателя внутреннего сгорания. Выхлопная система содержит первый катализированный цельный массив носителя, содержащий первое тонкослойное покрытие, расположенное в первой тонкослойной зоне цельного массива носителя, где первое тонкослойное покрытие содержит каталитическую композицию, содержащую, по меньшей мере, один металл платиновой группы и, по меньшей мере, один материал носителя, где, по меньшей мере, один металл платиновой группы в первом тонкослойном покрытии подвержен улетучиванию, когда первое тонкослойное покрытие выдерживается в условиях температуры ≥700°C, и второе тонкослойное покрытие, расположенное во второй тонкослойной зоне цельног