EXHAUST GAS PURIFICATION CATALYST

The present disclosure provides an exhaust gas purification catalyst with increased exhaust gas purification performance. The exhaust gas purification catalyst has a porous support, catalyst metal particles supported in the pores of the porous support, and zirconium dioxide particles supported in th...

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Bibliographische Detailangaben
Hauptverfasser:	HAYASHI, Takahiro, ISHIKAWA, Hiroyuki, MIURA, Masahide, SHIRAKAWA, Hiroki
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	The present disclosure provides an exhaust gas purification catalyst with increased exhaust gas purification performance. The exhaust gas purification catalyst has a porous support, catalyst metal particles supported in the pores of the porous support, and zirconium dioxide particles supported in the pores of the porous support. The zirconium dioxide particles are supported in a uniformly dispersed manner in the pores, as monoclinic crystals or a mixture of monoclinic crystals and tetragonal crystals, the phrase "supported in a uniformly dispersed manner" meaning that when the exhaust gas purification catalyst is measured with an electron beam microanalyzer, the proportion of the abundance ratio of zirconium in a surface region up to a depth of 1.5 μm from the exhaust gas purification catalyst surface with respect to the abundance ratio of zirconium in the region inward from that surface region of the exhaust gas purification catalyst, is 95 to 105 mol %.