A method of converting nitrogen oxides in a gas to nitrogen by contacting the nitrogen oxides with a nitrogenous reducing agent in the presence of a zeolite catalyst containing at least one transition metal, wherein the zeolite is a small pore zeolite containing a maximum ring size of eight tetrahedral atoms, wherein the at least one transition metal is selected from the group consisting of Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir and Pt.

Transition metal/zeolite scr catalysts

An exhaust gas-purifying catalyst includes a substrate, and a catalytic layer facing the substrate and including a precious metal, alumina, an oxygen storage material, and a sulfate of an alkaline-earth metal having an average particle diameter falling within a range of 0.01 to 0.70 μm, the average particle diameter being obtained by observation using a scanning electron microscope. Another exhaust gas-purifying catalyst includes a substrate, and a catalytic layer formed on the substrate using slurry containing a precious metal, alumina, an oxygen storage material, and a sulfate of an alkaline-earth metal having an average particle diameter falling within a range of 0.01 to 0.70 μm, the average particle diameter being obtained by observation using a scanning electron microscope.

Exhaust gas purifying catalyst

There is disclosed a hydrothermally stable microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure, such as SAPO-34 or aluminosilicate zeolite, able to retain a specific percentage of its surface area and micropore volume after treatment with heat and moisture, such as at least 80% of its surface area and micropore volume after exposure to temperatures of up to 900 0C in the presence of up to 10 volume percent water vapor for a time ranging from 1 to 16 hours. Methods of using the disclosed crystalline material, such as in the SCR of NOx in exhaust gas are also disclosed, as are methods of making such materials.

Novel microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure and methods of making and using same

Use of physical vapor deposition methodologies to deposit nanoscale gold on activating support media makes the use of catalytically active gold dramatically easier and opens the door to significant improvements associated with developing, making, and using gold-based, catalytic systems. The present invention, therefore, relates to novel features, ingredients, and formulations of gold-based, heterogeneous catalyst systems generally comprising nanoscale gold deposited onto a nanoporous support.

Catalysts, activating agents, support media, and related methodologies useful for making catalyst systems especially when the catalyst is deposited onto the support media using physical vapor deposition

A perovskite-type catalyst consists essentially of a metal oxide composition The metal oxide composition is represented by the general formula: Aa-xBxM0b, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or, b is 4 when a is 2; and x is a number defined by 0 ≤ x ∫ 07

Perovskite-type metal oxide compounds

PURPOSE:To obtain a catalyst for catalytic reduction of NOx capable of efficient reduction of NOx in exhaust gas without using a large amt. of a reducing agent and excellent in durability even in the presence of moisture by carrying cerium oxide on a solid acid carrier. CONSTITUTION:Cerium oxide is carried on a solid acid carrier to obtain the objective catalyst for catalytic reduction of NOx with hydrocarbon or an oxygen-contg. org. compd. as a reducing agent. The solid acid carrier is a carrier exhibiting solid acidity in a temp. region in which the catalyst is used. A zeolite type or oxide type solid acid carrier may be used as the solid acid carrier and the pref. amt. of the cerium oxide carried on the solid acid carrier is 5-80wt.% of the total amt. of them. The catalyst itself can be formed into one of various shapes such as a honeycomb or sphere shape by a known forming method.

Catalyst for catalytic reduction of nox

PURPOSE:To provide a catalyst for efficiently reducing nitrogen oxide in a waste gas in a wide temp. range even in the coexistence of oxygen and moisture by providing an inside layer having a catalytic component expressed by a specific formula and a surface layer carrying a specific catalytic component on the inside layer. CONSTITUTION:The inside layer constituting a catalytic structural body on the base material contains a perovskite type multiple oxide expressed by the formula (A expresses La, Y, Ce, Pr, Nd or the like, B expresses Na, K, Bi, Th, Ba, Sr, Ca or the like, C expresses Mn, Co, Fe, Ni, Cr, Cu, V, Mo, W, Ta, Li or the like and 0<=X<=1) as the catalytic component. And the surface layer on the inside layer has the catalytic component made by carrying at least one kind of metals, the ions or the oxides of Ib group, IIa group, IIb group, IIIa group, IIIb group, IVa group, IVb group, Va group, VIIa group and VIII group in the Periodical Table on at least one kind of carrier selected from aluminum oxide, titanium dioxide, zirconium oxide and H type zeolite.

Catalytic structure for nitrogen oxide catalytic reduction

PURPOSE:To remove NOx in an exhaust gas efficiently. CONSTITUTION:From a viewpoint that in the reduction reaction between NOx and hydrocarbons on a reduction catalyst in an oxidative atmosphere, NO2, is reduced more easily than NO, an exhaust gas is previously contacted with an oxidation catalyst to oxidize NO in the exhaust gas into NO2. The treated exhaust gas, in an oxidative atmosphere containing excessive oxygen and in the presence of hydrocarbons, is contacted with a reduction catalyst selected from zeolite of a proton type, zeolite of an alkali metal type, and acid metal oxide (metal oxide treated with a compound having sulfate group to reduce NO2, in the exhaust gas into nitrogen.

Treatment method for removing nitrogen oxide

PROBLEM TO BE SOLVED: To provide a copper catalyst which is used for hydrogenating aldehydes, ketones, carboxylic acids, carboxylates and aromatic nitro compounds and has high activity, high selectivity and high durability and to provide the use of the copper catalyst and a method for manufacturing the copper catalyst. SOLUTION: The hydrogenation catalyst is manufactured by firing a composition containing (a) copper oxide, (b) silicon oxide and calcium oxide which are derived from calcium silicate and (c) aluminum oxide and magnesium oxide which are derived from hydrotalcite and/or magnesium oxide derived from a magnesium compound containing a metal component other than magnesium and reducing the fired composition. It is suitably used as a shaped catalyst. COPYRIGHT: (C)2008,JPO&INPIT

Hydrogenation catalyst, its use and its manufacturing method

PURPOSE:To perform the catalytic reduction of a nitrogen oxide efficiently in exhaust gas under the coexistence of oxygen by carrying a perovskite type composite oxide of specified structure as a catalyst for nitrogen oxide catalytic reduction in which hydrocarbon and/or oxygen containing compound is sued as a reducing agent on a solid carrier. CONSTITUTION:A perovskite composite oxide represented by the formula I (A is an element such as Y or La, B is an element such as Ba or Sr and C is an element such as Mn or Co. 0<=X<=1) is used. Said perovskite type composite oxide is carried on a carrier of solid acid of zeolite group or the like composed of alkali metal in zeolite ion exchanged by ammonium ion or hydrogen ion. In the case hydrocarbon containing a compound is used as a reducing agent, the hydrogen oxide is reacted selectively with hydrocarbon and the oxygen containing compound under the coexistence of oxygen in said catalyst, and the nitrogen oxide can be reduced efficiently without using a large amount of reducing agent.

宏益清水

Papers

Catalyst for catalytic reduction of nox

Catalytic structure for nitrogen oxide catalytic reduction

Treatment method for removing nitrogen oxide

Hydrogenation catalyst, its use and its manufacturing method

Catalyst catalytic reduction of for nitrogen oxide

宏益 清水

Papers

Catalyst for catalytic reduction of nox

Catalytic structure for nitrogen oxide catalytic reduction

Treatment method for removing nitrogen oxide

Hydrogenation catalyst, its use and its manufacturing method

Catalyst catalytic reduction of for nitrogen oxide

宏益清水