Exhaust system for a lean burn ic engine
AssigneeJohnson Matthey Public Limited Company
InventorsGuy Richard Chandler, Neil Robert Collins, Paul Richard Phillips, Daniel Swallow
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Abstract
An exhaust system (10) for a lean-burn internal combustion engine (12) comprises a first substrate monolith (16) comprising a catalyst for oxidizing nitric oxide (NO) comprising a catalytic oxidation component followed downstream by a second substrate monolith (18) which is a wall-flow filter having inlet channels and outlet channels, wherein the inlet channels comprise a NO x absorber catalyst (20) and the outlet channels comprise a catalyst for selective catalytic reduction (22) of nitrogen oxides with nitrogenous reductant.
Claims16
An exhaust system for a lean-burn internal combustion engine comprising a first substrate monolith comprising a first catalyst for oxidizing nitric oxide (NO) followed downstream by a second substrate monolith which is a wall-flow filter having inlet and outlet channels and an inlet and outlet end, wherein the inlet channels comprise a NOx absorber catalyst (NAC) comprising a catalytic oxidation component and the outlet channels comprise a first catalyst for selective catalytic reduction (SCR) of nitrogen oxides with a nitrogenous reductant, wherein the inlet channels of the wall-flow filter comprise a second SCR catalyst disposed downstream of the NAC.
Dependencies are inferred from the claim text.