Catalytic article for treating exhaust gas

Provided is a catalytic article comprising (a) a flow through honeycomb substrate having channel walls; (b) a first NH 3 -SCR catalyst composition coated on and/or within the channel walls in a first zone; and (c) a second NH 3 -SCR catalyst composition coated on and/or within the channel walls in a...

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Bibliographische Detailangaben
Hauptverfasser:	Mikael Larsson, Tim Genschow, Penelope Markatou, Jane Gast, Lingzhi Zhang, Olivier Sonntag, Andrew Walker, Gudmund Smedler
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES THEIR RELEVANT APPARATUS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	Provided is a catalytic article comprising (a) a flow through honeycomb substrate having channel walls; (b) a first NH 3 -SCR catalyst composition coated on and/or within the channel walls in a first zone; and (c) a second NH 3 -SCR catalyst composition coated on and/or within the channel walls in a second zone, provided that the first zone is upstream of the second zone and the first and second zones are adjacent or at least partially overlap; and wherein the first NH 3 -SCR catalyst comprises a first copper loaded molecular sieve having a copper to aluminum atomic ratio of about 0.1 to 0.375 and the second NH 3 -SCR catalyst comprises a second copper loaded molecular sieve having a copper-to-aluminum atomic ratio of about 0.3 to about 0.6.