CATALYST FOR EXHAUST PURIFICATION

To provide a catalyst for exhaust purification with improved exhaust purifying performance.SOLUTION: A catalyst includes a Rh-carrying CeZr complex oxide 5 and a Pd-carrying CeZr complex oxide 7. In its fresh state, the CeZr complex oxide carrying Rh has a peak pore size of 20-70 nm based on the BJH...

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Hauptverfasser:	MATSUMURA MASUHIRO, HIRAHARA MIE, SHIGETSU MASAHIKO, YAMADA KEIJI
Format:	Patent
Sprache:	eng ; jpn
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:	To provide a catalyst for exhaust purification with improved exhaust purifying performance.SOLUTION: A catalyst includes a Rh-carrying CeZr complex oxide 5 and a Pd-carrying CeZr complex oxide 7. In its fresh state, the CeZr complex oxide carrying Rh has a peak pore size of 20-70 nm based on the BJH method for pore distribution, and a total pore capacity of 0.6-0.8 cm3/g. In its fresh state, the CeZr complex oxide carrying Pd has a peak pore size of 40-90 nm and a total pore capacity of 0.25-0.5 cm3/g.SELECTED DRAWING: Figure 1 【課題】排気ガス浄化用触媒の排気ガス浄化性能を向上させる。【解決手段】触媒はＲｈ担持ＣｅＺｒ系複合酸化物５とＰｄ担持ＣｅＺｒ系複合酸化物７を含有し、Ｒｈ担持用のＣｅＺｒ系複合酸化物は、フレッシュ状態では、ＢＪＨ法に基づく細孔分布におけるピーク細孔径が２０～７０ｎｍ、全細孔容量が０．６～０．８ｃｍ３／ｇ、Ｐｄ担持用のＣｅＺｒ系複合酸化物は、フレッシュ状態では、ピーク細孔径が４０～９０ｎｍ、全細孔容量が０．２５～０．５ｃｍ３／ｇである。【選択図】図１