Nissan Motor Company Limited

Misaki Fujimoto

Masanori Nakamura

Yasunari Hanaki

Takamasa Nakagawa

Naoki Kachi

An exhaust gas purification catalyst contains an oxide 1 and an oxide 2. The catalyst has pores Pwith a pore size of from 1 nm to 260 nm, that can be measured by the nitrogen absorption method, and the total sum &#x3a3;PVof the pore volume PVof the pores is equal to or greater than 0.79 cm/g. The oxide 1 is an oxide with an oxygen release capability. The oxide 2 is represented by LaMM'O(2), where M is at least one element selected from the group consisting of Ba, Sr and Ca, M&#x2032; is at least one element selected from the group consisting of Fe, Co, Ni and Mn, &#x3b4; is the amount of oxygen deficiency, x satisfies 0&#x2264;x&#x2264;1, and &#x3b4; satisfies 0&#x2264;&#x3b4;&#x2264;1.

Exhaust gas purification catalyst and production method thereof

An exhaust gas purifying catalyst () of the present invention includes anchor/promoter simultaneous enclosure particles () including catalyst units () which contain: noble metal particles (); and anchor particles () as an anchor material of the noble metal particles () supporting the noble metal particles (); promoter units () which are provided not in contact with the noble metal particles () and contain first promoter particles () having an oxygen storage and release capacity; and an enclosure material () which encloses both the catalyst units () and the promoter units (), and separates the noble metal particles () and the anchor particles () in the catalyst units () from the first promoter particles () in the promoter units (). The exhaust gas purifying catalyst () further includes second promoter particles () which have the oxygen storage and release capacity, and are not enclosed in the anchor/promoter simultaneous enclosure particles () by the enclosure material ().

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Kanagawa, Japan

Misaki Fujimoto