EXHAUST GAS TREATMENT SYSTEMS UTILIZING A SINGLE ELECTRICALLY HEATED CATALYST
First Claim
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 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 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.
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Accused Products
Abstract
Exhaust gas systems include an oxidation catalyst (OC) capable of receiving exhaust gas and oxidizing one or more of combustable hydrocarbons (HC) and one or more nitrogen oxide (NOx) species, a selective catalytic reduction device (SCR) disposed downstream from and in fluid communication with the OC via a conduit, and an electrically heated catalyst (EHC) disposed at least partially within the conduit downstream from the OC and upstream from the SCR. 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. The OC includes one or more storage materials individually or collectively capable of storing NOx and/or HC species. Exhaust gas can be supplied by an internal combustion engine which can optionally power a vehicle.
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Citations
20 Claims
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1. An exhaust gas treatment system, the system comprising:
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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, and one 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 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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An internal combustion engine (ICE) exhaust gas treatment system, the system comprising:
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an ICE configured to emit exhaust gas to a conduit; an oxidation catalytic device (OC) configured to receive exhaust gas from the ICE via the conduit at an upstream side and release exhaust gas into the conduit 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, and at least one storage material capable of storing NOx and/or HC species; a selective catalytic reduction device (SCR) disposed downstream from the OC and in fluid communication therewith via the conduit, and configured to store NOx species and/or reduce NOx species in the presence of a reductant; and an electrically heated catalyst (EHC) disposed at least partially within the conduit downstream from the OC and upstream from the SCR, 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification