Abstract: An exhaust gas-purifying three-way catalyst containing: (i) base material particles of a Nd-solid dissolved zirconia-based complex oxide comprising Nd and Zr as constituent metal elements in the following mass proportions: ZrO2 50 to 75% by mass; and Nd2O3 25 to 50% by mass, in terms of oxides; and (ii) Pd catalyst particles supported on the base material particles, wherein the Nd-solid dissolved zirconia-based complex oxide further contains at least one or more rare earth elements selected from the group consisting of yttrium, scandium, lanthanum, and praseodymium, as a constituent metal element, in an amount of a total of more than 0% by mass to 20% by mass or less in terms of an oxide.

Abstract: A three-way catalyst for purifying exhaust including noble metal components, enables sintering of the noble metal to be suppressed even at high temperature, enables carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) to be removed and a method for purifying exhaust gas. A carrier having a honeycomb structure is coated with two or more layers of the catalyst compositions, an upper layer including a heat resistant inorganic oxide supporting Pd and a La-containing oxide, a lower layer including a heat resistant inorganic oxide supporting Rh. The content of La in terms of La2O3 is 9.6 g/L to 23 g/L, the content of Ce in terms of CeO2 is 5 g/L to 20 g/L, and the content of Ba in terms of BaO is 1.2 g/L or less per unit volume of the honeycomb structure.

Abstract: A three-way catalyst for purifying exhaust including noble metal components, enables sintering of the noble metal to be suppressed even at high temperature, enables carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) to be removed and a method for purifying exhaust gas. A carrier having a honeycomb structure is coated with two or more layers of the catalyst compositions, an upper layer including a heat resistant inorganic oxide supporting Pd and a La-containing oxide, a lower layer including a heat resistant inorganic oxide supporting Rh. The content of La in terms of La2O3 is 9.6 g/L to 23 g/L, the content of Ce in terms of CeO2 is 5 g/L to 20 g/L, and the content of Ba in terms of BaO is 1.2 g/L or less per unit volume of the honeycomb structure.

Abstract: There are provided an exhaust gas-purifying three-way catalyst having a large palladium surface area and excellent in heat resistance and three-way purification performance, easy to produce, and also excellent in productivity, and a method for producing the same, an exhaust gas-purifying catalytic converter, and the like.

Abstract: Disclosed are alumina materials including a barium sulfate, catalyst or adsorbent using the same, in particular, catalyst for exhaust gas purification superior in NOx purification performance, suitable as a catalyst for purifying harmful substances included in exhaust gas discharged from an internal combustion engine of a gasoline vehicle, a diesel vehicle. An alumina material containing a barium sulfate in an amount of 5 to 70% by mass to alumina, wherein average particle size of barium sulfate dispersing in the alumina material is 4 ?m or smaller, average particle size of alumina is 50 ?m or smaller, and BET specific surface area of the alumina material is 20 to 250 m2/g; a catalyst for exhaust gas purification using the alumina material including a barium sulfate. It is preferable that the alumina material including a barium sulfate is coated onto an integrated structure-type carrier, as a catalyst layer.