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US 2019/0376424 A1Published application
IN-EXHAUST ELECTRICAL ELEMENT FOR NOx STORAGE CATALYST AND SCR SYSTEMS
AssigneeJohnson Matthey Public Limited Company
InventorsDavid Bergeal, Nicholas Dunkley, Daneil Hatcher, Andrew Izzard, Paul Phillips
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Abstract
An exhaust system comprising: a NOx storage catalyst; an electric heating element; and a NOx reduction catalyst wherein the heating element is located downstream of the NOx storage catalyst.
Claims14
An exhaust system comprising:
- a. a NOx storage catalyst;
- b. an electric heating element;
- and
- c. a NOx reduction catalyst
- wherein the heating element forms a single unit with the NOx storage catalyst;
- and
- wherein the NOx reduction catalyst is a selective catalytic reduction filter catalyst.
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A method for treating an exhaust gas stream from an internal combustion engine, comprising:
- a. adsorbing NOx onto a NOx storage catalyst at temperatures at or below a low temperature;
- b. heating the NOx storage catalyst with an electrical heating element to thermally desorb NOx from the NOx storage catalyst at a temperature above the low temperature;
- c. catalytically removing the desorbed NOx on the NOx reduction catalyst.
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Dependencies are inferred from the claim text.