US 11,808,190 B2
System comprising vehicular compression ignition engine and an emissions control device comprising an electrically heatable element
David Bergeal, Royston (GB); Andrew Chiffey, Royston (GB); Daniel Hatcher, Royston (GB); Francois Moreau, Royston (GB); and Paul Phillips, Royston (GB)
Appl. No. 17/597,854
Filed by JOHNSON MATTHEY PUBLIC LIMITED COMPANY, London (GB)
PCT Filed Aug. 4, 2020, PCT No. PCT/EP2020/071902
§ 371(c)(1), (2) Date Jan. 26, 2022,
PCT Pub. No. WO2021/023741, PCT Pub. Date Feb. 11, 2021.
Claims priority of application No. 19190856 (EP), filed on Aug. 8, 2019.
Prior Publication US 2022/0282650 A1, Sep. 8, 2022
Int. Cl. F01N 3/08 (2006.01); F01N 3/20 (2006.01); F01N 3/28 (2006.01); B01D 53/94 (2006.01); F02D 41/02 (2006.01); F02D 41/40 (2006.01); F01N 13/00 (2010.01); F02D 41/38 (2006.01)
CPC F01N 3/0835 (2013.01) [B01D 53/944 (2013.01); B01D 53/9418 (2013.01); B01D 53/9431 (2013.01); B01D 53/9477 (2013.01); B01D 53/9486 (2013.01); B01D 53/9495 (2013.01); F01N 3/0842 (2013.01); F01N 3/2013 (2013.01); F01N 3/2066 (2013.01); F01N 3/2803 (2013.01); F01N 3/2842 (2013.01); F01N 13/009 (2014.06); F02D 41/024 (2013.01); F02D 41/401 (2013.01); B01D 2255/1021 (2013.01); B01D 2255/1023 (2013.01); F01N 2370/02 (2013.01); F02D 2041/389 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for treating an exhaust gas stream containing unburned hydrocarbons and oxides of nitrogen (NOx) emitted from a vehicular compression ignition engine following key-on/cold-start, which method comprising the steps of:
a. post-injecting hydrocarbons in one or more cylinders of the engine to raise the temperature of the first honeycomb substrate immediately following key-on/cold start;
b. adsorbing unburned hydrocarbons in the exhaust gas stream from step a onto a hydrocarbon adsorbent component of a first honeycomb substrate at temperatures at or below a low temperature and simultaneously oxidising nitrogen monoxide (NO) in the exhaust gas stream to nitrogen dioxide (NO2) on a catalysed second honeycomb substrate disposed downstream from the first honeycomb substrate, wherein the catalysed second honeycomb substrate comprises a rhodium-free platinum group metal (PGM) comprising platinum;
c. thermally desorbing hydrocarbons from the hydrocarbon adsorbent component of the first honeycomb substrate at a temperature above the low temperature;
d. heating an electrically heatable element disposed downstream from the first honeycomb substrate to heat the catalysed second honeycomb substrate disposed downstream from the electrically heatable element to a temperature at or above the unburned hydrocarbon oxidation light-off temperature (T50) of the catalysed second honeycomb substrate;
e. catalytically converting the desorbed unburned hydrocarbons on the catalysed second honeycomb substrate; and
f. introducing a nitrogenous reductant and/or a precursor therefor into the exhaust gas stream downstream from the second catalysed honeycomb substrate and converting NOx in the exhaust gas stream containing ammonia with third honeycomb substrate comprising an ammonia-selective catalytic reduction catalyst.