Mitsui Minings & Melting Co., Ltd.

Masataka Ogasawara

Sumio Kato

Hironori Iwakura

Yunosuke Nakahara

Takashi Wakabayashi

Toshiharu Moriya

Katsuya Iwashina

Takahito Asanuma

Shinichi Nakata

Atsunori Ono

Yohei Takahashi

In relation to a Cu-based delafossite-type oxide that is effective as an exhaust gas purification catalyst, Cu is placed in a high catalytic activity low-valence state, whereby a novel Cu-based delafossite-type oxide having higher activity than in the past is provided. Proposed is a delafossite-type oxide for an exhaust gas purification catalyst that is represented by a general formula ABO, wherein Cu and Ag are contained in the A site of the general formula, one or two or more elements selected from the group consisting of Mn, Al, Cr, Ga, Fe, Co, Ni, In, La, Nd, Sm, Eu, Y, V, and Ti are contained in the B site of the general formula, and Ag is contained at a ratio of 0.001 at. % or more and less than 20 at. % in the A site of the general formula.

Delafossite-type oxide for exhaust gas purification catalyst, and exhaust gas purification catalyst using same

Provided is a novel exhaust gas purification catalyst, which uses a Cu-based delafossite oxide, capable of increasing the exhaust gas purification performance compared to the case of using the Cu-based delafossite oxide alone. Proposed is an exhaust gas purification catalyst comprising a delafossite-type oxide represented by a general formula ABOand an inorganic porous material, wherein Cu is contained in the A site of the general formula of the delafossite oxide, one or two or more elements selected from the group consisting of Mn, Al, Cr, Ga, Fe, Co, Ni, In, La, Nd, Sm, Eu, Y, V, and Ti are contained in the B site thereof, and Cu is contained in 3 to 30% relative to the total content (mass) of the delafossite-type oxide and the inorganic porous material.

Exhaust gas purification catalyst

Provide is a new carrier for exhaust gas purification catalyst which exhibits excellent catalytic activity, particularly catalytic activity at a low temperature. Proposed is a carrier for exhaust gas purification catalyst composed of particles which contain a silicate or phosphate containing one kind or two or more kinds among the elements belonging to Group 1 and Group 2 in the periodic table.

Carrier for exhaust gas purification catalyst and exhaust gas purification catalyst

An apatite compound represented by general formula: A(PO)(OH)(wherein A represents Ba or a combination of Ba and Sr and/or Ca) is used as a carrier. This exhaust gas purifying catalyst is obtained by having the apatite compound carrier support a noble metal component.

Exhaust gas purifying catalyst and carrier

Growing community of inventors

Akita, Japan

Masataka Ogasawara