OVERGANGSMETAL/ZEOLIT-SCR-KATALYSATORER

An exhaust system (10) for a vehicular lean burn internal combustion engine (12), which system comprising a conduit (14) for carrying a flowing exhaust gas, a source of nitrogenous reductant (26), a zeolite catalyst (20) containing at least one transition metal disposed in a flow path of the exhaust...

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Bibliographische Detailangaben
Hauptverfasser:	CASCI, John Leonello, CHEN, Hai-Ying, FEDEYKO, Joseph Michael, ANDERSEN, Paul Joseph, RAJARAM, Raj Rao, COLLIER, Jillian Elaine, Foo, Rodney Kok Shin
Format:	Patent
Sprache:	dan
Schlagworte:	PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TRANSPORTING
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Beschreibung
Zusammenfassung:	An exhaust system (10) for a vehicular lean burn internal combustion engine (12), which system comprising a conduit (14) for carrying a flowing exhaust gas, a source of nitrogenous reductant (26), a zeolite catalyst (20) containing at least one transition metal disposed in a flow path of the exhaust gas and means (22, 28, 30) for metering nitrogenous reductant into a flowing exhaust gas upstream of the zeolite catalyst, wherein the zeolite catalyst is a small pore zeolite containing a maximum ring size of eight tetrahedral atoms, wherein the zeolite is a synthetic zeolite having the CHA Framework Type Code, wherein the at least one transition metal is copper, wherein an oxidation catalyst (16) comprising at least one platinum group metal for oxidising nitrogen monoxide to nitrogen dioxide is located upstream of the means (22) for metering the nitrogenous reductant into a flowing exhaust gas.