FIELD: chemistry.
SUBSTANCE: NOx trap includes a substrate, the first layer comprising the first platinum group metal, the first NOx storage component and the first carrier, the second layer comprising the second platinum group metal, the second NOx storage component and the second carrier, and the third layer comprising rhodium and the third carrier, wherein the first layer is characterized by the level of platinum group metal introduction which is in the range from 1 to 40 percent of the level of platinum group metal introduction into the second layer, at that, the first NOx storage component and the second NOx storage component re identical, and the first carrier and the second carrier are idenitcal as well.
EFFECT: reduced exposure to deactivation during desulphurization, NOx trap regeneration.
14 cl, 3 tbl, 2 ex
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|
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| NOx CATALYST-ADSORBER | 2018 |
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