Abstract: Provided are an exhaust gas purifying catalyst structure that inhibits foil elongation and improves structural durability and a production method therefor. The exhaust gas purifying catalyst structure has a metal support configured by using an mantle and a metal foil provided in the mantle and forming an exhaust gas flow path, and a catalyst layer provided on a surface forming the flow path of the metal foil, wherein the catalyst layer contains a noble metal, an OSC material containing cerium and a rare earth element other than cerium (non-Ce rare earth element), and alumina, and a content of the non-Ce rare earth element with respect to 100% by mass of the catalyst layer is 2.52% by mass or more and 4.62% by mass or less in terms of an oxide.

Abstract: Provided is a porous structure for exhaust purification catalysts having excellent light-off temperature characteristics. The porous structure for exhaust purification catalysts includes an oxygen storage component and an inorganic porous solid. The porous structure has a pore volume distribution such that the ratio of the pore volume of pores with a diameter of from 15 nm to less than 25 nm to the pore volume of pores with a diameter of from 5 nm to less than 15 nm is 1.3 to 2.5 as measured with a mercury porosimeter. The pore volume distribution preferably has at least one peak top in a pore diameter range of from 15 nm to less than 25 nm.

Abstract: Provided is a porous structure for exhaust purification catalysts having excellent light-off temperature characteristics. The porous structure for exhaust purification catalysts includes an oxygen storage component and an inorganic porous solid. The porous structure has a pore volume distribution such that the ratio of the pore volume of pores with a diameter of from 15 nm to less than 25 nm to the pore volume of pores with a diameter of from 5 nm to less than 15 nm is 1.3 to 2.5 as measured with a mercury porosimeter. The pore volume distribution preferably has at least one peak top in a pore diameter range of from 15 nm to less than 25 nm.

Abstract: A catalyst powder according to the present invention is a catalyst powder that includes: a core portion that contains ceria and zirconia; and a surface layer portion that is located on the core portion and contains ceria and zirconia. The ratio (M2/M1) is 0.30 or more and 0.95 or less, the ratio (M2/M1) being the ratio of a mole fraction M2 (mol %) of cerium in the surface layer portion measured using X-ray photoelectron spectroscopy to a mole fraction M1 (mol %) of cerium in the entire powder. It is preferable that the ratio (M4/2/M3/1) between M3/1 and M4/2 is 1.1 or more and 5.0 or less, wherein M3/1 (=M3/M1) represents the ratio between a mole fraction M3 (mol %) of zirconium in the entire powder and a mole fraction M1 (mol %) of cerium in the entirety of the powder, and M4/2 (=M4/M2) represents the ratio between a mole fraction M4 (mol %) of zirconium measured using X-ray photoelectron spectroscopy and a mole fraction M2 (mol %) of cerium measured using X-ray photoelectron spectroscopy.

Abstract: Provided is a new catalyst structure for exhaust gas treatment including an upper catalyst layer and a lower catalyst layer, in which the catalyst structure can sufficiently exhibit functions as a three way catalyst while maintaining gas diffusibility. Proposed is a catalyst structure including a substrate, an upper catalyst layer, and a lower catalyst layer, the catalyst structure having a first peak or a second peak at a pore volume diameter of 10 nm to 50 nm and a pore volume diameter of 50 nm to 100 nm, respectively, in the logarithmic differential pore volume distribution analyzed by a mercury intrusion porosimeter.

Abstract: A system (9) of the invention is a system for detecting deterioration of a catalyst (8) provided in an exhaust passage (12) of an internal combustion engine (11), the system including: means (5) that detects a temperature of an exhaust on an upstream side of the catalyst (8); means (6) that detects a temperature of the exhaust on a downstream side of the catalyst (8); a recognition unit (10) that recognizes, both upstream and downstream of the catalyst (8), a change point at which the temperature changes from temperature fall or constant temperature to temperature rise during acceleration operation, or a change point at which the temperature changes from temperature rise or constant temperature to temperature fall during deceleration operation; and a determination unit (10) that determines that the catalyst (8) has deteriorated when a difference (?T or ?T?) between the upstream and downstream change points becomes equal to or longer than a predetermined time.

Abstract: The invention relates to a catalyst composition using other metals different from precious metals as a catalytically active component and is to propose a novel catalyst composition for exhaust gas purification which has excellent catalytic activity, in particular, excellent treatment activity of HC even after a thermal durability treatment. The invention is to propose a catalyst composition for exhaust gas purification comprising catalyst particles having a constitution in which Cu and a transition metal A including at least one of Cr, Fe, Mn, Co, Ni, Zr, and Ag are supported on ceria (CeO2) particles and a catalyst using the same.

Abstract: An improved methane oxidation catalyst including tin oxide-supported platinum exerts superior methane oxidation activity at lower temperatures. The methane oxidation catalyst for oxidizing methane in exhaust gas includes platinum supported on tin oxide, and satisfies formula (1): y?0.27 x, where x is a platinum content (wt %) relative to tin oxide, and y is a ratio of a peak intensity of (111)-faceted platinum relative to a peak intensity of (111)-faceted tin oxide (Pt(111)/SnO2(111)), in a diffraction pattern (2?=37 to 41°) obtained by measurement with an X-ray diffractometer (XRD).

Abstract: A fuel reforming catalyst which contains an inorganic porous support, a catalytically active species, and catalyst particles including CeO2 and ZrO2 and in which the concentration of ZrO2 in the catalyst particles is higher in the vicinity of the particle surface than in the particle interior and the concentration of CeO2 in the catalyst particles is equal in the particle interior and in the vicinity of the particle surface is proposed for the purpose of providing a new fuel reforming catalyst which can effectively lower the concentration of the hydrocarbon of C2 or more in the gas which has passed through a steam reforming reaction.

Abstract: A catalyst powder according to the present invention is a catalyst powder that includes: a core portion that contains ceria and zirconia; and a surface layer portion that is located on the core portion and contains ceria and zirconia. The ratio (M2/M1) is 0.30 or more and 0.95 or less, the ratio (M2/M1) being the ratio of a mole fraction M2 (mol %) of cerium in the surface layer portion measured using X-ray photoelectron spectroscopy to a mole fraction M1 (mol %) of cerium in the entire powder. It is preferable that the ratio (M4/2/M3/1) between M3/1 and M4/2 is 1.1 or more and 5.0 or less, wherein M3/1 (=M3/M1) represents the ratio between a mole fraction M3 (mol %) of zirconium in the entire powder and a mole fraction M1 (mol %) of cerium in the entirety of the powder, and M4/2 (=M4/M2) represents the ratio between a mole fraction M4 (mol %) of zirconium measured using X-ray photoelectron spectroscopy and a mole fraction M2 (mol %) of cerium measured using X-ray photoelectron spectroscopy.

Abstract: The exhaust gas purification catalyst carrier of the invention includes a modified aluminum borate which contains aluminum borate and at least one addition element selected from the group consisting of a rare earth element and an alkaline earth metal and which has an electronegativity of 2.732 or lower.

Abstract: A system (9) of the invention is a system for detecting deterioration of a catalyst (8) provided in an exhaust passage (12) of an internal combustion engine (11), the system including: means (5) that detects a temperature of an exhaust on an upstream side of the catalyst (8); means (6) that detects a temperature of the exhaust on a downstream side of the catalyst (8); a recognition unit (10) that recognizes, both upstream and downstream of the catalyst (8), a change point at which the temperature changes from temperature fall or constant temperature to temperature rise during acceleration operation, or a change point at which the temperature changes from temperature rise or constant temperature to temperature fall during deceleration operation; and a determination unit (10) that determines that the catalyst (8) has deteriorated when a difference (?T or ?T?) between the upstream and downstream change points becomes equal to or longer than a predetermined time.

Abstract: To reduce an OSC material, while maintaining necessary OSC capacity; and to improve heat resistance and reactivity of a precious metal. Proposed is an exhaust gas purifying catalyst which comprises a first catalyst layer that is formed on the surface of a substrate that is formed of a ceramic or a metal, and a second catalyst layer that is formed on the upper side of the first catalyst layer. The first catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:7 to 1:3. The second catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:1 to 10:0.

Abstract: 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.

Abstract: The present invention relates to a catalyst composition for purifying exhaust gas and an exhaust gas purifying catalyst which contain a manganese-containing composite oxide, and an object of the invention is to provide a novel catalyst composition which can sufficiently function as an exhaust gas purifying catalyst even without supporting a precious metal as a catalytically active component. To achieve the object, there is proposed a catalyst composition for purifying exhaust gas including particles containing a manganese-containing composite oxide and particles containing a metal of Group 5 to Group 11 having an electron in the d orbital (however, Mn, Pt, Rh, and Pd are excluded) or an oxide of the metal in a mixed state.

Abstract: The invention relates to a catalyst carrier for exhaust gas purification catalyst which contains a metal phosphate containing Zr, and it provides a new catalyst carrier which exhibits excellent NOx purification performance in a high temperature region. The invention proposes a carrier for exhaust gas purification catalyst containing a metal phosphate which has a NASICON type structure and contains Zr.

Abstract: Disclosed is an exhaust gas purification catalyst carrier which includes a phosphate salt represented by formula: MPO4 (wherein M represents Y, La, or Al) or a zirconium phosphate represented by formula ZrP2O7; an exhaust gas purification catalyst containing a noble metal at least containing Rh and supported on the carrier; and an exhaust gas purification catalyst product having a catalyst support made of a ceramic or metallic material, and a layer of the exhaust gas purification catalyst, the layer being supported on the catalyst support.

Abstract: 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.

Abstract: Provided is a novel palladium catalyst capable of efficiently purifying carbon monoxide (CO) and total hydrocarbons (THC) under a fuel-rich atmosphere even when palladium (Pd) is used as a catalyst active component. Proposed is a palladium monolayer catalyst for an exhaust gas from a saddle-riding-type vehicle, which is an exhaust gas purification catalyst for a saddle-riding-type vehicle to be installed in an exhaust gas passage in an internal combustion engine. The palladium monolayer catalyst includes a substrate, and a catalyst layer that has the form of a monolayer and contains palladium acting as a catalyst active component, an inorganic porous body acting as a catalyst carrier, ceria (CeO2) particles acting as a promoter component, and barium.

Abstract: To reduce an OSC material, while maintaining necessary OSC capacity; and to improve heat resistance and reactivity of a precious metal. Proposed is an exhaust gas purifying catalyst which comprises a first catalyst layer that is formed on the surface of a substrate that is formed of a ceramic or a metal, and a second catalyst layer that is formed on the upper side of the first catalyst layer. The first catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:7 to 1:3. The second catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:1 to 10:0.