CPC F01N 3/035 (2013.01) [B01D 53/90 (2013.01); B01D 53/94 (2013.01); B01D 53/9418 (2013.01); B01D 53/9422 (2013.01); B01D 53/9427 (2013.01); B01D 53/9477 (2013.01); F01N 3/021 (2013.01); F01N 3/0814 (2013.01); F01N 3/0842 (2013.01); F01N 3/106 (2013.01); F01N 3/206 (2013.01); F01N 3/2066 (2013.01); F01N 13/009 (2014.06); B01D 53/9436 (2013.01); B01D 2251/202 (2013.01); B01D 2255/102 (2013.01); B01D 2255/1021 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/20738 (2013.01); B01D 2255/20761 (2013.01); B01D 2255/50 (2013.01); B01D 2255/9205 (2013.01); B01D 2255/9207 (2013.01); B01D 2258/012 (2013.01); F01N 2370/00 (2013.01); F01N 2510/06 (2013.01); F01N 2610/04 (2013.01); Y02A 50/20 (2018.01); Y02T 10/12 (2013.01)] | 18 Claims |
1. An emission treatment system for selectively reducing NOx compounds, the system comprising:
a hydrogen generator; and
an H2-SCR catalytic article comprising a substrate and an H2-SCR catalyst composition, the hydrogen generator being in fluid communication with, and upstream of, the H2-SCR catalytic article;
wherein the H2-SCR catalyst composition comprises a platinum group metal component with a metal loading ranging from 0.1% to 1% by weight of the H2-SCR catalyst composition supported on a support consisting of (i) a hydrogen form of zeolite, (ii) a metal oxide selected from the group consisting of zirconia, titania, magnesia, and combinations thereof, or (iii) combinations of (i) and (ii); and
at least one of (a) a diesel oxidation catalyst (DOC) catalyst composition; and (b) a lean NOx trap (LNT) composition,
wherein when the LNT composition is present, the system comprises a lean NOx trap (LNT) catalytic article comprising a substrate and the LNT catalyst composition, the LNT catalytic article in fluid communication with, and downstream of, the H2-SCR catalytic article, and
wherein when the DOC catalyst composition is present, the DOC catalyst composition is
present in a zoned catalyst coating on the H2-SCR catalytic article with an upstream zone comprising the H2-SCR catalyst composition and a downstream zone comprising the DOC catalyst composition.
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