EXHAUST GAS PURIFYING CATALYST, AND CATALYST BODY USING THE SAME

To provide an exhaust gas purifying catalyst which has high purification activity of Rh even when exposed to high temperatures for a long period of time.SOLUTION: An exhaust gas purifying catalyst disclosed herein comprises a base material and a catalytic noble metal supported on the base material....

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Hauptverfasser:	TANI TOSHIKI, TOGASHI HIROMI, SATO MASANAO, OISHI SHUNSUKE
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 an exhaust gas purifying catalyst which has high purification activity of Rh even when exposed to high temperatures for a long period of time.SOLUTION: An exhaust gas purifying catalyst disclosed herein comprises a base material and a catalytic noble metal supported on the base material. The base material comprises La-containing alumina particles and a zirconia coating arranged on the surface of the alumina particles. The catalytic noble metal contains at least Rh. The mass ratio of zirconia in the base material is at least 5 mass%. The average particle diameter of the zirconia coating, as determined by a focused ion beam scanning electron microscope, is less than 100 nm.SELECTED DRAWING: Figure 1 【課題】高温に長時間晒された場合でも、Ｒｈの浄化活性が高い排ガス浄化用触媒を提供する。【解決手段】ここに開示される排ガス浄化用触媒は、母材と、前記母材に支持された触媒貴金属と、を含む。前記母材は、Ｌａ含有アルミナ粒子と、前記アルミナ粒子の表面に配置されたジルコニアの被覆とを含む。前記触媒貴金属は、少なくともＲｈを含有する。前記母材におけるジルコニアの質量割合は、５質量％以上である。集束イオンビーム走査型電子顕微鏡によって求まる前記ジルコニアの被覆の平均粒径は、１００ｎｍ未満である。【選択図】図１