Provided are a stainless steel foil and a catalyst carrier for an exhaust gas purifying device which uses the foil. Specifically, a stainless steel foil contains, in percent by mass, 0.05% or less of C, 2.0% or less of Si, 1.0% or less of Mn, 0.003% or less of S, 0.05% or less of P, more than 15.0% and less than 25.0% of Cr, 0.30% or less of Ni, 3.0% to 10.0% of Al, 0.03% to 1.0% of Cu, 0.10% or less of N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005% to 0.20% of Zr, 0.03% to 0.20% of REM excluding Ce, 0.02% or less of Ce, 2.0% to 6.0% in total of at least one of Mo and W, and the balance being Fe and incidental impurities.

A process for the preparation of nano-oxide coated catalysts useful for the treatment of toxic gases by coating of composite materials containing LDHs over ceramic monolithic substrates. The process combines reacting oxides and salts of metals so as to prepare LDHs or mixed metal layered hydroxides possessing positive layer charge, from which a stable gel is prepared by adding swellable clay having a negative charge in different LDH:clay ratio in an aqueous medium and homogenizing the same in a high intensity ultrasonic processor. The gel is then dip-coated over cordierite/mulite honey-comb monolithic supports at various dipping and withdrawal rates. The dip-coated monoliths are then dried and calcined at different temperatures to develop the alumino-silicate supported nano-oxide coats over honey-comb ceramic substrates for carrying out decomposition of N20 gas in a He flow in various flow rates at 400 to 600 C. temperature in a cylindrical quartz tube.

A material is described of formula Na.sub.xM.sub.yAl.sub.aSi.sub.bO.sub. with Face Centered Cubic (fcc) lattices forming F-4 3 m cubic structure, wherein M is at least one of lithium, potassium, rubidium, caesium, vanadium, chromium, iron, cobalt, nickel, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold, and cerium; 0<x+y22/3; wherein when y=0, 4<x/3, when 0<y/3, 0x<22/3, and when M is potassium, x>0; 1a3; 1b3; and 0<32/3. An exhaust gas system comprising the material and a method are also described herein.

A process for removing sulfur from a gas containing sulfur compounds as H2S, SO2, COS, CS2 . . . , in a quantity of up to 15% wt; particularly gases emanating from the Claus process: A first hydrogenation of the sulfur compounds into H2S, the hydrogenation gas being used to regenerate a deactivated bed of oxidation catalyst, both being carried out at 200-500 C. After sulfur removal, the resulting gas undergoes a second hydrogenation step and then a direct oxidation step, said step being operated under the dew point of sulfur to trap the formed sulfur in the catalyst. In the further cycle, the gas streams are switched so as to regenerate the catalyst in run which is deactivated.

An exhaust system for an internal combustion engine is disclosed. The exhaust system comprises a particulate filter, one or more NO.sub.x reduction catalysts, and a low pressure exhaust gas recirculation (EGR) circuit for connecting the exhaust system downstream of the filter and the one or more NO.sub.x reduction catalysts to an intake of the engine. The EGR circuit comprises a N.sub.2O-producing catalyst.

The invention provides processes for cleaning carbon dioxide-containing process gases from the preparation of vinyl acetate after reaction of ethylene with acetic acid and oxygen in heterogeneously catalyzed, continuous gas phase processes, characterized in that carbon dioxide-containing process gases, for removal of carbon dioxide, are contacted with one or more scrubbing solutions, and one or more scrubbing solutions comprise one or more oxides of metals (metal oxides) selected from the group comprising vanadium, niobium, tantalum, chromium, molybdenum, manganese and arsenic.

Disclosed herein is an apparatus for precooling and purifying hydrogen including a body which includes a first chamber and a second chamber disposed in the first chamber with the second chamber being filled with a liquid cooling medium, a first cyclone chamber disposed in the second chamber and connected to a hydrogen supply pipe on an upper of one side thereof to allow the hydrogen which flows therein to move downward rotating to perform thermal exchange with the cooling medium and separation of impurities therefrom, a first hydrogen discharge pipe to allow hydrogen to flow from the first cyclone chamber to the outside, and an ortho-para hydrogen converting catalyst disposed on a path through which hydrogen which flows in the first hydrogen discharge pipe moves to allow ortho-para hydrogen conversion to be performed.

Porous metal oxide catalytic materials with planar morphologies which are derived from metal-organic framework (MOF) materials via thermal decomposition, oxidation pretreatment and pyrolysis processes. The porous metal oxides are mainly transition metal oxides, derived from MOFs containing the corresponding transition metal ions, such as Cu, Zn, Y, La, Ce, Ti, Zr, V, Cr, Mn, Fe, Co, and Ni ions. The transformation conditions from MOF materials to metal oxides, such as temperature, atmosphere and duration, are well defined to obtain metal oxides with controlled morphologies. Furthermore, the present subject matter relates to a low-temperature catalytic decomposition of volatile organic compounds (VOCs) with a wide concentration range on two-dimensional metal oxides.

A catalytic reaction apparatus includes a coating composition for a catalyst and a catalyst portion to which the coating composition is applied, wherein the coating composition includes 1 to 15 parts by weight of tungsten, 1 to 15 parts by weight of vanadium, 35 to 55 parts by weight of titanium and 30 to 45 parts by weight of oxygen. This apparatus is configured to prevent a decrease in catalytic reaction efficiency in a specific temperature environment, thereby maximizing versatility.

A method for synthesizing functionalized porous cerium oxide nanoparticles and the resulting nanoparticles. The method involves preparing a synthesis mixture comprising a cerium source, two other metal sources, and an organic acid serving as a fuel. Volatile components are removed from the mixture, which is then subjected to thermal treatment in a static oven. The resulting nanoparticles have a three-dimensional structure with micropores and mesopores, oxygen-defects sites, 10 wt % of transition elements, and 1 wt % of tri-valent cations. The nanoparticles exhibit high photocatalytic activity and adsorption efficiency, and can be coated on a stainless steel substrate. The nanoparticles can be used for photocatalytic reactions, selective reduction and oxidation reactions, adsorption of specific compounds, and removal of toxic compounds from the air. The nanoparticles are coated on a chimney and allows for reduced hydrocarbons, carbon dioxide and carbon monoxide.