EXHAUST GAS PURIFICATION CATALYST

Provided is an exhaust catalyst that exhibits higher NO X -reducing activities at the time of engine restart while maintaining its catalytic activities during normal traveling. This invention provides an exhaust cleaning catalyst 7 comprising a substrate 10 and a catalyst coating layer 30 that inclu...

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Bibliographische Detailangaben
Hauptverfasser:	HIRAI, Akimasa, MATSUEDA, Satoshi, HOSHINO, Sho, TAKI, Kenichi
Format:	Patent
Sprache:	eng ; fre ; ger
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 an exhaust catalyst that exhibits higher NO X -reducing activities at the time of engine restart while maintaining its catalytic activities during normal traveling. This invention provides an exhaust cleaning catalyst 7 comprising a substrate 10 and a catalyst coating layer 30 that includes CeO 2 . Catalyst coating layer 30 is constituted in its thickness direction with multiple coating layers. In a top coating layer 50 located at the outermost surface, the CeO 2 content in a top coating layer's upstream portion 51 is less than the CeO 2 content in a top coating layer's downstream portion 52; and the CeO 2 content in the top coating layer's upstream portion 51 is less than the CeO 2 content in a lower coating layer 40. The CeO 2 content per liter of catalyst volume in the entire coating layer is 10 g/L to 30 g/L.