CERIA-ZIRCONIA-BASED COMPOSITE OXIDE OXYGEN ABSORPTION/RELEASE MATERIAL, EXHAUST GAS CLEANING CATALYST AND HONEYCOMB STRUCTURE FOR EXHAUST GAS CLEANING

Provided are the following: a ceria-zirconia-based composite oxide oxygen absorption/release material which has a rapid oxygen absorption/release rate and which has an OSC function capable of responding rapidly to an exhaust gas composition in which there are no large fluctuations in terms of atmosp...

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Bibliographische Detailangaben
Hauptverfasser:	UEDE HIROKI, YAMABA MASASUKE, ITOH TOMOHARU, OKAMOTO KENJI, HIDAKA YUSUKE
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F 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 INORGANIC CHEMISTRY LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY 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 are the following: a ceria-zirconia-based composite oxide oxygen absorption/release material which has a rapid oxygen absorption/release rate and which has an OSC function capable of responding rapidly to an exhaust gas composition in which there are no large fluctuations in terms of atmosphere but which changes rapidly close to the stoichiometric air-fuel ratio; an exhaust gas cleaning catalyst; and a honeycomb structure for exhaust gas cleaning. This oxygen absorption/release material is a ceria-zirconia-based composite oxide and is characterized by having a composition whereby themolar ratio of cerium and zirconium is such that cerium / (cerium + zirconium) is 0.33-0.90 and the ion conductance, as measured using an alternating current impedance method, is 1*10-5 S/cm or more at 400 DEG C, and in that one or more rare earth metal ions M selected from among Sm3+, Eu3+, Pr3+, Gd3+ and Dy3+, each of which has a coordination number of more than 7.0, are contained at a quantityof 0.5-15 mol.% relative t