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Exhaust gas treatment systems utilizing a single electrically heated catalyst

  • US 10,641,147 B2
  • Filed: 07/26/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 07/26/2017
  • Status: Active Grant
First Claim
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1. An exhaust gas treatment system, the system comprising:

  • an oxidation catalytic device (OC) configured to receive exhaust gas at an upstream side and release exhaust gas at a downstream side, and comprising a catalytic composition including;

    one or more first oxidation catalyst materials capable of oxidizing carbon monoxide (CO), hydrocarbons (HC), and one or more nitrogen oxide (NOx) species, andone or more storage materials individually or collectively capable of storing NOx and HC species;

    a selective catalytic reduction device (SCR) disposed downstream from the OC and in fluid communication therewith via a conduit, and configured to store NOx species and/or reduce NOx species in the presence of a reductant;

    a reductant injector configured to deliver the reductant into the conduit at a reductant injection position between the OC and the SCR; and

    an electrically heated catalyst (EHC) disposed at least partially within the conduit downstream from all catalytic composition of the OC and upstream from the reductant injection position, wherein the EHC comprises a heating element having an outer surface including one or more second oxidation catalyst materials capable of oxidizing CO, HC, and one or more NOx species and is configured to directly heat the SCR.

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