EXHAUST GAS PURIFICATION CATALYST

The present invention provides a catalyst for purification of exhaust gas comprising:a substrate, anda catalyst coat layer which is formed on a surface of the substrate and which contains catalyst particles, whereinthe catalyst coat layer has an average thickness in a range of 25 to 150 µm,a void fr...

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Bibliographische Detailangaben
Hauptverfasser:	MORIKAWA, Akira, ONOZUKA, Takashi, KATOH, Satoru, TAKAGI, Nobuyuki, YAMAMOTO, Toshio, MIURA, Masahide, KABASHIMA, Nobusuke, OKADA, Mitsuyoshi
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:	The present invention provides a catalyst for purification of exhaust gas comprising:a substrate, anda catalyst coat layer which is formed on a surface of the substrate and which contains catalyst particles, whereinthe catalyst coat layer has an average thickness in a range of 25 to 150 µm,a void fraction, as determined by scanning electron microscope (SEM) observation of a cross-section of the catalyst coat layer, is in a range of 1.5 to 8.0% by volume,60 to 90% by volume of all voids in the catalyst coat layer are high-aspect ratio pores which have equivalent circle diameters in a range of 2 to 50 um in a cross-sectional image of a cross-section of the catalyst coat layer perpendicular to a flow direction of exhaust gas in the substrate, and which have aspect ratios of 5 or higher,the high-aspect ratio pores have an average aspect ratio in a range of 10 to 50, anda noble metal is supported on the entire catalyst coat layer.