The present invention relates to an exhaust gas purification system comprising two catalytic sub-systems, wherein the first catalytic sub-system is for conversion of NOx, HC, CO and optionally particulate matter, and the second sub-system is for conversion of CO. The second sub-system locates at the downstream of the first catalytic sub-system. An air injection is positioned between the first catalytic sub-system and second catalytic sub-system.

Bimetal oxide catalyst and methods, a method comprises: mixing and grinding to obtain a mixture comprising a manganese salt (a), at least one of other metal salt (b), and an additive (c), wherein the other metal salt comprises at least one of a copper salt, a cobalt salt, a cerium salt, an iron salt, or a nickel salt, and the additive comprises at least one of polyol or organic acid, and calcining the mixture to obtain the bimetal oxide catalyst.

Disclosed is a catalyst useful for producing organic amines by catalytic amination, its preparation and application thereof, wherein the catalyst comprises an inorganic porous carrier containing aluminum and/or silicon and an active metal component supported on the carrier, the active metal component comprises at least one metal selected from the group consisting of Group VIII and Group IB metals, and the carrier has an ammonia adsorption capacity of 0.25 to 0.65 mmol/g, as measured by NH.sub.3-TPD test. The catalyst has an improved performance, when used for producing organic amines by catalytic amination.

Catalyst for oxygen storage capacity applications that include a zinc doped manganese-iron spinel mixed oxide material. The zinc doped manganese-iron spinel mixed oxide material may be synthesized by a co-precipitation method using a precipitation agent such as sodium carbonate and exhibits a high oxygen storage capacity.

The invention relates to a catalyst useful in the steam reforming of hydrocarbons and oxygenated hydrocarbons. The invention provides a method for preparing a catalyst comprising heating a spinel of formula ANi.sub.xFe.sub.(1-X)CrO.sub.4 where A is Mn or Mg and x is from 0 to 0.75 under reducing conditions at a temperature of from 800 to 1500° C., and catalysts obtainable by said method.

The methanation reaction catalyst is a methanation reaction catalyst for methanation by allowing CO and/or CO.sub.2 to react with hydrogen, wherein the methanation reaction catalyst includes a stabilized zirconia support, into which a stabilizing element forms a solid solution, and having a crystal structure of a tetragonal system and/or a cubic system, and Ni supported on the stabilized zirconia support. The stabilizing element is a transition element of at least one selected from the group consisting of Mn, Fe, and Co.

The present invention relates to a catalyst for oxidative dehydrogenation and a method of preparing the same. More particularly, the present invention provides a catalyst for oxidative dehydrogenation having a porous structure which may easily control heat generation due to high-temperature and high-pressure reaction conditions and side reaction due to the porous structure and thus exhibits superior product selectivity, and a method of preparing the catalyst.

A composite catalyst for coal depolymerization, the catalyst includes an agent A and an agent B. The agent A includes an iron salt-based catalyst, and the agent B includes a metal salt-based catalyst different from the iron salt-based catalyst. The agent A and the agent B are alternately added during use.

A Ni-based steam reforming catalyst having excellent carbon deposition resistance and sintering resistance is provided. The steam reforming catalyst is constituted by including nickel as a catalytically active metal, lanthanum as a first co-catalyst component, manganese as a second co-catalyst component, and a carrier containing γ-alumina as a main component.

When the porous ceramic structure contains Co together with Fe or Mn, the Co content is higher than or equal to 0.1 mass % and lower than or equal to 3.0 mass % in terms of Co.sub.3O.sub.4, and when the porous ceramic structure contains Co without containing Fe and Mn, the Co content is higher than or equal to 0.2 mass % and lower than or equal to 6.0 mass % in terms of Co.sub.3O.sub.4. The ratio of the sum of the Fe content in terms of Fe.sub.2O.sub.3, the Mn content in terms of Mn.sub.2O.sub.3, and the Co content in terms of Co.sub.3O.sub.4 to the Ce content in terms of CeO.sub.2 is higher than or equal to 0.8 and lower than or equal to 9.5.