An improved catalyst system is provided for the direct decomposition removal of NO.sub.x from an exhaust gas stream at temperatures between about 350° C. and about 600° C. that employs an (amorphous CuO.sub.x)/Co.sub.3O.sub.4 catalyst. The catalyst has an amorphous CuO.sub.x deposit on the surfaces of particles of Co.sub.3O.sub.4 spinel oxide. The catalyst is configured to reduce NO.sub.x to N.sub.2 without the presence of a reductant. The (amorphous CuO.sub.x)/Co.sub.3O.sub.4 catalyst is formed by the precipitation of the deposit from solution onto a suspension of Co.sub.3O.sub.4 spinel oxide particles. The catalyst system can be employed in a catalytic converter for the direct decomposition removal of NO.sub.x from an exhaust gas stream flowing at a temperature of less than or equal to about 500° C.

A catalyst containing an active phase comprising at least one metal of group VIIIB selected from cobalt, nickel, ruthenium and iron deposited on a support containing silica, alumina and at least one simple spinel MAl2O4 or mixed spinel MxM′(1-x)Al2O4) which is or is not partial, wherein M and M′ are separate metals selected from the group formed by magnesium, copper, cobalt, nickel, tin, zinc, lithium, calcium, caesium, sodium, potassium, iron and manganese, and wherein x is between 0 and 1, the values 0 and 1 being themselves excluded, characterised in that said active phase further comprises boron, the boron content being between 0.001% and 0.5% by weight with respect to the total weight of the catalyst, the value 0.5 being itself excluded.

There is provided an exhaust gas purification system that allows efficient purification of NOx present in exhaust gas emitted from an internal combustion engine. The exhaust gas purification system of the disclosure comprises a first exhaust gas purification device that purifies exhaust gas emitted from an internal combustion engine, wherein the atmosphere alternately switches between a reducing agent-excess atmosphere and an oxidizing agent-excess atmosphere with respect to the stoichiometric atmosphere, and a second exhaust gas purification device that further purifies the exhaust gas that has been purified by the first exhaust gas purification device, wherein the first exhaust gas purification device has a three-way catalyst, and the second exhaust gas purification device has an exhaust gas purifying catalyst that comprises an AMn.sub.2O.sub.4 spinel-type oxide support (A=Mg, Zn or Li) on which a precious metal is supported.

A manufacturing method thereof, and the catalyst for removing the nitrogen oxide includes a powdery gamma alumina support on which at least one selected from a group of titanium (Ti), lanthanum (La), or zirconium (Zr) is supported, wherein the support may be further supported with iridium (Ir) and ruthenium (Ru).

The present invention relates to a method of preparing a catalyst for oxidative dehydrogenation. More particularly, the present invention provides a method of preparing a catalyst for oxidative dehydrogenation providing superior selectivity and yield for a conjugated diene according to oxidative dehydrogenation by constantly maintaining pH of a coprecipitation solution using a drip-type double precipitation method to adjust an -iron oxide content in a catalyst in a predetermined range.

The present invention provides a production method for indene, comprising a dehydrogenation step of obtaining a reaction product containing indene by contacting a raw material composition containing indene with a dehydrogenation catalyst, wherein the dehydrogenation catalyst comprises a support containing aluminum, and a group 14 metal element and platinum supported on the support, a content of the platinum in the dehydrogenation catalyst is 0.6 to 2.5% by mass based on a whole amount of the dehydrogenation catalyst, and an atomic ratio of the group 14 metal element to the platinum in the dehydrogenation catalyst is 4.0 to 20.0.

Provided is a catalyst system for oxidative dehydrogenation, a reactor for oxidative dehydrogenation including the catalyst system, and a method of performing oxidative dehydrogenation using the reactor. In the catalyst system, a fixed-bed reactor is filled with a catalyst for oxidative dehydrogenation in an n-stage structure (n being an integer of 2 or more), wherein each stage of the n-stage structure satisfies Equations 1 and 2 as claimed so that the concentration of an active ingredient included in the catalyst gradually increases in the direction in which reactants are fed into the reactor. Heat generated inside the reactor may be effectively controlled during oxidative dehydrogenation, thereby improving conversion rate, selectivity, and yield. In addition, catalyst deterioration may be reduced, thereby improving long-term stability of the catalyst.

A method for producing a three-dimensional porous catalyst monolith of stacked catalyst fibers, comprising the following steps: a) Preparing a suspension paste in a liquid diluent of a reforming catalyst, and which suspension can furthermore comprise a binder material, all particles in the suspension having an average particle size in the range of from 0.5 to 500 m, b) extruding the paste of step a) through one or more nozzles to form fibers, and depositing the extruded fibers to form a three-dimensional porous catalyst monolith precursor, c) drying the porous catalyst monolith precursor to remove the liquid diluent, d) calcining the porous catalyst monolith precursor to form the porous catalyst monolith.

The present invention provides a production method for indene, comprising a dehydrogenation step of obtaining a reaction product containing indene by contacting a raw material gas containing indane and molecular hydrogen with a dehydrogenation catalyst, wherein the dehydrogenation catalyst comprises a support containing aluminum, and a supported metal supported on the support, the supported metal contains a group 14 metal element and platinum, and an atomic ratio of the group 14 metal element to the platinum in the dehydrogenation catalyst is 8.0 or less.

A bifunctional catalyst for conversion of oxygenates, said bifunctional catalyst comprising zeolite, alumina binder, Zn and P, wherein P is evenly distributed across the catalyst.