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    Combination of a Zeolite-Based SCR Catalyst with a Manganese-Based SCR Catalyst in the Bypass
    3.
    发明申请
    Combination of a Zeolite-Based SCR Catalyst with a Manganese-Based SCR Catalyst in the Bypass 审中-公开

    公开(公告)号：US20200332691A1

    公开(公告)日：2020-10-22

    申请号：US16770876

    申请日：2018-11-21

    Applicant: Umicore AG & Co. KG

    Inventor： Nicola Soeger ,  Andrea De Toni ,  Fei Wen ,  Stephan Malmberg

    IPC: F01N3/20 ,  F01N3/035

    Abstract: The invention relates to an exhaust-gas aftertreatment system for selective catalytic reduction with a plurality of SCR catalytic converters, which exhaust-gas aftertreatment system is able to reduce NOx in a large temperature range and can store SOx. The invention further relates to a method for treating an exhaust gas flow, in which method the exhaust-gas aftertreatment system according to the invention is used. The system comprises a high-temperature SCR catalyst for temperature ranges between 250° C. and 750° C. and a low-temperature SCR catalyst arranged downstream thereof for temperature ranges between 60° C. and less than 250° C. There is a reductant supply system directly upstream of the high-temperature SCR catalyst. The high-temperature SCR catalyst is designed to reduce NOx in exhaust gas that has a temperature above a temperature threshold value and to store SOx in the temperature range below the threshold value. The low-temperature SCR catalyst reduces NOx in the temperature range below the threshold value. In each case, the exhaust gas flows through the high-temperature SCR catalyst. An exhaust-gas bypass valve or flow control valve is arranged directly upstream of the low-temperature SCR catalyst. If the temperature of the exhaust gas is greater than or equal to the temperature threshold value, the exhaust gas is completely conducted past the low-temperature SCR catalyst. The high-temperature SCR catalyst advantageously contains a molecular sieve as a catalytically active layer, and the catalytically active layer of the low-temperature SCR catalyst is preferably a manganese-containing mixed oxide.

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