Synergized platinum group metals (SPGM) with ultra-low PGM loadings employed as underfloor (UF) three-way catalyst (TWC) systems with varied material compositions and configurations are disclosed. SPGM UF catalysts in which ZPGM compositions of binary and ternary spinel structures supported onto support oxides are coupled with commercialized PGM close-coupled (CC) catalysts and tested under Federal Test Procedure FTP-75 within TGDI and PI engines. The performance of the TWC systems including commercialized PGM CC and SPGM UF (with ultra-low PGM loadings) catalysts is compared to the performance of commercialized PGM CC and PGM UF catalysts. The disclosed TWC systems indicate that SPGM UF TWC catalytic performance is comparable or even exceeds high PGM-based conventional TWC catalysts, with reduced tailpipe emissions.

The invention relates to a composition containing an oxide supported oxidative coupling of methane catalyst having an excellent balance of catalytic activity and selectivity while retaining desired levels mechanical stability suitable for commercial reactor application. Particularly, the inventive catalyst is an oxide supported catalyst with the oxide catalyst support having a spherical diameter of less than 2 mm and a surface area of less than less than 9.5 m.sup.2/g while retaining a water sorption volume of at least 0.2 cc/g. The invention further provides a method for preparing such a composition containing an oxide supported catalyst, using a combination of thermal treatment of the oxide catalyst support, active component impregnation and followed up by calcination. Additionally, the invention also describes a process for producing C.sub.2+ hydrocarbons, using such a catalyst composition.

The invention relates to a composition containing an oxide supported oxidative coupling of methane catalyst having an excellent balance of catalytic activity and selectivity while retaining desired levels mechanical stability suitable for commercial reactor application. Particularly, the inventive catalyst is an oxide supported catalyst with the oxide catalyst support having a spherical diameter of less than 2 mm and a surface area of less than less than 9.5 m.sup.2/g while retaining a water sorption volume of at least 0.2 cc/g. The invention further provides a method for preparing such a composition containing an oxide supported catalyst, using a combination of thermal treatment of the oxide catalyst support, active component impregnation and followed up by calcination. Additionally, the invention also describes a process for producing C.sub.2+ hydrocarbons, using such a catalyst composition.

An object of the present invention is to provide an exhaust gas purification catalyst for purifying exhaust gas, in particular, fine composite-metal particles contained therein, and a method for producing the same; the exhaust gas purification catalyst according to the present invention includes fine composite-metal particles containing Rh and Pd, wherein, when the fine composite-metal particles in the exhaust gas purification catalyst are analyzed by STEM-EDX, the average ratio of the amount of Pd with respect to the total amount of Rh and Pd in the fine composite-metal particles is 1.7 atomic % or more and 24.8 atomic % or less.

An object of the present invention is to provide an exhaust gas purification catalyst for purifying exhaust gas, in particular, fine composite-metal particles contained therein, and a method for producing the same; the exhaust gas purification catalyst according to the present invention includes fine composite-metal particles containing Rh and Pd, wherein, when the fine composite-metal particles in the exhaust gas purification catalyst are analyzed by STEM-EDX, the average ratio of the amount of Pd with respect to the total amount of Rh and Pd in the fine composite-metal particles is 1.7 atomic % or more and 24.8 atomic % or less.

An exhaust gas-purifying catalyst of the present invention comprises a substrate, and one or more catalytic layers provided on the substrate, wherein at least one of the catalytic layers (i) contains a precious metal, alumina, and an acidic oxide element, (ii) has a correlation coefficient ρ.sub.Al,AE of 0.70 or more, and (iii) has a correlation coefficient ρ.sub.PM,AE of 0.70 or more.

An exhaust gas-purifying catalyst of the present invention comprises a substrate, and one or more catalytic layers provided on the substrate, wherein at least one of the catalytic layers (i) contains a precious metal, alumina, and an acidic oxide element, (ii) has a correlation coefficient ρ.sub.Al,AE of 0.70 or more, and (iii) has a correlation coefficient ρ.sub.PM,AE of 0.70 or more.

Catalyst compositions, articles, systems and methods related to a three-way-catalyst composition comprising alumina doped with a transition metal.

Catalyst compositions, articles, systems and methods related to a three-way-catalyst composition comprising alumina doped with a transition metal.

Disclosed is a hydrocarbon gas reforming supported catalyst, and methods for its use, that includes a catalytic material capable of catalyzing the production of a gaseous mixture comprising hydrogen (H.sub.2) and carbon monoxide (CO) from a hydrocarbon gas and a clay support material comprising a clay mineral, wherein the catalytic material is chemically bonded to the clay support material, and wherein the chemical bond is a M1-M2 bond, where M1 is a metal from the catalytic material and M2 is a metal from the clay support material, or the chemical bond is a M1-O bond, where M1 is a metal from the catalytic material and oxygen (O) is from the clay support material, wherein the supported catalyst comprises at least 70% or more by weight of the clay support material.