Control of emissions
AssigneeJohnson Matthey Public Limited Company
InventorDaniel Swallow
Life of this patent
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Abstract
A diesel engine aftertreatment system comprises a diesel engine having an exhaust manifold and a filter substrate in direct connection with the exhaust manifold without any intervening catalyst, wherein the filter substrate comprises on its inlet side an SCR catalyst incorporating a non-coking molecular sieve.
Claims18
A diesel engine after-treatment system comprising
- a light duty diesel engine having common rail fuel injection, an exhaust manifold and a filter substrate in direct connection with the exhaust manifold wherein the system is free of a diesel oxidation catalyst disposed between the exhaust manifold and the filter substrate,
- wherein the filter substrate comprises on its inlet side an SCR catalyst incorporating a non-coking small pore molecular sieve and comprises on its outlet side an oxidation catalyst containing a precious metal.
A method for treating combustion exhaust gas from a light-duty diesel engine utilizing common rail fuel injection, the method comprising passing the exhaust gas, without passage through a diesel oxidation catalyst, in admixture with a nitrogeneous reductant through a filter substrate comprising on its inlet side an SCR catalyst incorporating a non-coking small pore molecular sieve and comprising on its outlet side an oxidation catalyst containing a precious metal.
Dependencies are inferred from the claim text.