Composite oxide, method for producing same and catalyst for exhaust gas purification

FIELD: chemistry.

SUBSTANCE: invention relates to a composite oxide, which can be used for catalysts, functional ceramics, solid electrolytes for fuel elements, abrasive and similar, in particular, to catalysts for cleaning automobile exhaust gas, as well as to a method of producing composite oxide. Oxide contains 50–98 wt% of cerium oxide and one of rare-earth metal elements, other than cerium and including yttrium, zirconium and aluminium, at a ratio of 85:15 to 100:0 by weight, 1–30 wt% alkali-earth metal oxides and 1–20 wt% silicon oxide.

EFFECT: invention provides easy production of composite oxide, having excellent heat resistance, specific surface area of which is retained even when oxide is used in a medium with high temperature, and after calcination at 800 °C for 2 hours which does not deteriorate performance of a cocatalyst.

10 cl, 1 tbl, 12 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: apparatus for producing a catalyst comprises a reservoir designed for preparing an aqueous mixed solution containing Mo compound, V compound and Nb compound, a dryer designed to spray-dry the aqueous mixed solution and a pipe for connecting the reservoir with the dryer such that the aqueous mixed solution can be fed from the reservoir into the dryer. In the apparatus, a heater designed to heat the aqueous mixed solution is mounted in the reservoir and/or the pipe, and a filter designed to filter the aqueous mixed solution is installed in the pipe. The apparatus and methods of producing a catalyst provide uniform supply of the prepared aqueous mixed solution into the dryer.

EFFECT: catalyst is then used in a method of producing an unsaturated acid or unsaturated nitrile.

20 cl, 6 dwg, 7 ex

FIELD: chemistry.

SUBSTANCE: method of producing a molybdenum catalyst for epoxidation of olefins includes dissolving, at 30-50°C, molybdenum metal powder in a medium which contains peroxide compounds with the weight ratio of waste water to molybdenum of 1:(0.006-0.025). The medium which contains peroxide compounds used is waste water from combined production of styrene and propylene oxide at the step of washing ethylbenzene oxidation product with water with concentration of peroxides in the waste water of 0.25-1.10 mol/l.

EFFECT: use of waste water from combined production of styrene and propylene oxide when producing the molybdenum catalyst for epoxidation of olefins, the obtained molybdenum catalyst is characterised by storage stability and high activity and selectivity in the epoxidation reaction.

3 cl, 2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of preparing oxide-polymetallic catalysts, containing metals of platinum group, for oxidative-vapour conversion of hydrocarbons with obtaining carbon oxide and hydrogen. Method includes processing NiO and CO3O4 with solutions of nitrates Al, Ce, Zr and compounds of palladium Pd(NH3)4Cl2, platinum H2[PtCl6]·6H2O and rhodium H3[RhCl6], with the following drying; coking obtained material in methane flow at 550°C, obtaining paste from said material, pseudoboehmite and tetraisopropoxylane, filling foam-nichrome pores with suspension from obtained material, removal of water at 80°C, calcinations for 3 hours in argon atmosphere at 1300°C, removal of carbon with water vapours at 600°C for 3 hours.

EFFECT: creation of highly efficient heterogeneous catalyst.

4 cl, 7 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: to obtain the catalyst zeolite L of a 100% crystallinity with crystals of a cylindrical shape with the size of 1-3 mcm is prepared by the preparation of a reaction mixture from potassium aluminate and a colloidal solution of silicon dioxide with molar ratios: H2O/K2O=27-54; K2O/SiO2=0.24-0.48; SiO2/Al2O3=6-12. Hydrothermal crystallisation of the reaction mixture for 24-216 h at a temperature of 140-190°C, filtering, washing out to neutral pH of the solution and drying are carried out. A granulated carrier is prepared by mixing the obtained zeolite L powder and boehmite in the form of finely dispersed powder of aluminium hydroxide with the particles size of 20-45 mcm, moistening, and peptisation until a homogeneous mass is obtained. The obtained mass is granulated by extrusion, the granules are dried and annealed. Platinum is applied on the obtained carrier by cation exchange from a water solution of platinum tetrammine with the platinum concentration of 1.5-4.4 mg/ml. The content of ingredients in the obtained catalyst constitutes, wt %: platinum - 0.3-0.7, boehmite - 19.9-59.5, zeolite L - the remaining part.

EFFECT: increase of the output and activity of the catalyst, increase of selectivity with respect to the formation of aromatic hydrocarbons.

1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a method of obtaining a hydrocracking catalyst carrier, a carrier, a method of a catalyst obtaining, the catalyst and a method of hydrocracking in the presence of the obtained catalyst. The catalyst carrier contains an amorphous binding catalyst and zeolite Y. The method of the carrier obtaining includes annealing zeolite Y with a molar ratio of silicon dioxide to aluminium oxide higher than 12, with the size of an elementary cell in the range from 24.10 to 24.40 E and a surface area of at least 850 m2/g, at a temperature from 700 to 950°C for 50 min to 4 hours. The method of the catalyst obtaining includes soaking the obtained carrier with compounds of group VIII and VIB metals.

EFFECT: increased catalyst selectivity.

11 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: described is a method of preparing a catalyst of converting synthesis-gas into hydrocarbons from particles of aluminium oxide or oxyhydroxide and a water solution, containing urea and cations Co2+, which includes successive stages of intensive mixing at a temperature higher than 80°C suspended in the water solution particles of aluminium oxide or oxyhydroxide, shaped as circular cylinders, and the separation of the catalyst granules from the suspension, containing a highly disperse oxyhydroxo compound Co-Al.

EFFECT: increase of the catalyst activity and selectivity.

6 cl, 1 tbl, 1 dwg, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to technological processes, namely to methods of realising chemical processes, in particular to the field of general and special catalysis, as well as to the creation of novel materials with special properties for the realisation of the said processes. The invention can be used for manufacturing thermochemical catalytic reactors of steam fuel conversion and chemical regeneration of heat, chemical current sources, fuel elements. In the method of a nanocatalytic material manufacturing obtaining a catalytically active layer on a metal carrier is carried out by the application of a powder composition by means of high-energy processes of the heterophase transfer with the application of two or more autonomously working devices on the metal carrier. The carrier has through holes, made by notching or by the other way of perforation. An area of the through holes of the metal carrier constitutes from 0.1 to 0.7 cm2, thickness of the catalytically active layer is from 100 to 200 mcm.

EFFECT: obtaining the nanocatalytic material, characterised by higher process efficiency, conditioned by an efficient mass-exchange in a reaction zone and the presence of through porosity, higher specific surface of the material due to the polydisperse structure and the presence of microporosity, higher strength of adhesion of the catalytic layer to the metal carrier.

4 cl, 2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalysts, used for obtaining element sulphur in Claus process. Claimed catalyst of obtaining element sulphur in Claus process represents mixture χ-, γ-Al2O3 and X-ray amorphous phase of aluminium oxidein the following ratio: χ-Al2O3 and X-ray amorphous phase 65-99.9 wt % and γ-Al2O3 0.1-35, wt %. Volume of mesopores with diameter from 3 to 10 nm in catalyst constitutes 0.12-0.35 cm3/g, and ratio of volume of mesopores with diameter 3-10 nm to volume of ultramacropores with diameter more than 1000 nm is less than or equals 5. Invention also relates to method of preparing said catalyst and method of carrying out Claus process with its application.

EFFECT: application of claimed catalyst makes it possible to increase efficiency of Claus process.

11 cl, 1 dwg, 4 tbl, 12 ex

FIELD: medicine, pharmaceutics.

SUBSTANCE: invention refers to an improved method for carbonylation of at least one carbonylating reagent specified in a group consisting of dimethyl ester and methanol, carbon monoxide in the presence of a catalyst to prepare at least one carbonylation product specified in a group consisting of methyl acetate and acetic acid, and the above catalyst is prepared by combining modernite comprising one of: silver and copper with an inorganic oxide binding agent.

EFFECT: improved method for carbonylation.

14 cl, 2 dwg, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalyst, suitable to application in reactions of conversion of carbon oxides, in form of granules, formed by pressing reduced and passivated catalyst powder, and claimed powder contains copper in the interval 10-80 wt %, zinc oxide in the interval 20-90 wt %, aluminium oxide in the interval 5-60 wt % and, optionally, one or several oxide promoter compounds, selected from compounds of Mg, Cr, Mn, V, Ti, Zr, Ta, Mo, W, Si and rare-earth elements, in quantity in the interval 0.01-10 wt %. Said granules have average crush strength in horizontal direction after production ≥6.5 kg, ratio of values of average crush strength in horizontal direction after reduction and after production ≥0.5:1 and area of copper surface over 60 m2/g Cu. Invention also relates to method of claimed catalyst production and to method of conversion of carbon oxides in presence of claimed catalyst.

EFFECT: catalyst has high strength of granules and high activity as a result of increased area of copper surface, which makes it possible to apply reactors of smaller size and increase process productivity.

15 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of regenerating a lanthanide catalyst from synthesis of diethoxysuccinate of aspartic acid. The method includes contacting a carbonate source with a solution containing lanthanide ions, formed during said synthesis, and a chelating agent, different from diethoxysuccinate of aspartic acid, for precipitation of a lanthanide carbonate followed by separation of the precipitated lanthanide carbonate from the solution, wherein said chelating agent is iminodisuccinic acid or ethylenediamine disuccinic acid. The invention also relates to a method of producing diethoxysuccinate of aspartic acid, which includes reacting diethanolamine with a maleate in alkaline conditions in the presence of a lanthanide catalyst.

EFFECT: improved regeneration of a lanthanide catalyst for synthesis of diethoxysuccinate of aspartic acid.

12 cl, 4 dwg, 4 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: method includes preparation of carrier by thermal processing at 500°C, application of alcohol film-generating solution by method of stretching at rate 100 mm/min, drying at 60°C for 1 h and annealing at 750°C for 4 h. Film-generating solution is applied on fibreglass carrier by method of soaking with further drying at 60°C for 1 h and annealing at 600-750°C for 1 h. Catalyst, which is obtained in form of cloth, is cut at output in accordance with reactor shape and packed in layers at angle of 20-30°, with formation of honeycomb structure, with the following component ratio in film-generating solution, wt %: Ce(NO3)3·6H2O - from 6.0 to 12.0, SnCl4·5H2O - from 16.6 to 22.3, C6H4OHCOOH - from 9.1 to 10.0, 96%-by weight C2H5OH - the remaining part.

EFFECT: method makes it possible to obtain catalysts, characterised by high permeability of gas mixture flow.

2 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: catalyst is characterised by the following content of components: 30-70 wt % (Mo5-12Sb>6.0-15Bi0.2-3M10.1-10M20.05-0.5M30.01-2On) and 70-30 wt % SiO2, where M1 is one or more elements selected from Co, Ni, Fe, Cr, Cu; M2 is one or more elements selected from Na, K, Cs, Mg, Ce, La, M3 is an element selected from P, B, n is a number defined by the valence and number of elements other than oxygen. The invention also relates to a method of producing butadiene-1,3 using said catalyst.

EFFECT: catalyst enables to achieve high butadiene selectivity in oxidative dehydrogenation of n-butenes and provides high output of butadiene.

3 cl, 1 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalytic purification of exhaust gases of internal combustion engines. Claimed is composition for purification of exhaust gases of internal combustion engines based on cerium oxide, containing niobium oxide, with the following weight contents: niobium oxide from 2 to 20%, the remaining part - cerium oxide. Also claimed is composition with the following weight contents: cerium oxide at least 65%, niobium oxide from 2 to 12%, zirconium oxide to 48%. After calcinations for 4 hours at 800°C compositions have acidity at least 6·10-2, with said acidity being expressed in ml of ammonia per m2 of composition, with the surface, expressed in m2, used for determination of acidity, representing specific surface after calcinations for 4 hours at 800°C and specific surface at least 15 m2/g, and after calcinations for 4 hours at 1000°C it has specific surface at least 2 m2/g, in particular at least 3 m2/g. Invention relates to catalyst, which contains said compositions, to methods of oxidising CO and hydrocarbons, N2O, decomposition, for HOx and CO2 adsorption. Said compositions and catalyst are applied in reaction of gas with water, reaction of conversion with water steam, isomeration reaction, reaction of catalytic cracking and as triple action catalyst.

EFFECT: compositions possess satisfactory reducing ability in combination with good acidity, specific surface of which remains suitable for application in catalysis.

16 cl, 1 tbl, 14 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst for producing amide compounds by reacting a nitrile compound with water. Said catalyst includes a manganese oxide-based catalyst which contains bismuth and additionally yttrium or vanadium. The invention also relates to a method of producing an amide compound in the presence of said catalyst.

EFFECT: disclosed catalyst has high activity.

8 cl, 5 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention refers to a catalyst element used in hydration processes. The presented catalyst element contains a noble metal, which represents palladium, and an element of lanthanide group. which represents europium coating a carrier containing a substantially nonporous glass-containing substrate. The above glass-containing substrate has a specific surface measured by S.A.N2-BET method based on N2 heat adsorption/desorption or S.A.Kr-BET method based on Kr heat adsorption/desorption, within the range of 0.01 m2/g to 10 m2/g, and a rate of specific surface change by sodium chemical absorption SACRNa≤0.5. Palladium and europium each present in an amount of 10 portions per million by weight to 1 % by weight, on account of the catalyst element weight. The invention also refers to a method for feed stream hydration in the presence of the above catalyst element and to a method for producing the above catalyst.

EFFECT: presented catalyst element possesses selective and stable activity in the hydration processes.

8 cl, 3 dwg, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to processing hydrocarbon material, particularly to catalysts and techniques for aromatisation of C3-C4 hydrocarbon gases, light low-octane hydrocarbon fractions and oxygen-containing compounds, as well as mixtures thereof to obtain a concentrate of aromatic hydrocarbons. The catalyst contains a mechanical mixture of two zeolites. The first zeolite is characterised by silica modulus SiO2/Al2O3=20. The zeolite is pretreated with aqueous alkali solution and is modified with oxides of rare-earth elements in amount of 0.5-2.0 wt % of the weight of the first zeolite. The second zeolite is characterised by silica modulus SiO2/Al2O3=82. The zeolite contains residual amounts of sodium oxide 0.04 wt % of the weight of the second zeolite and is modified with magnesium oxide in amount of 0.5-5.0 wt % of the weight of the second zeolite. The zeolites are used in weight ratio of 1.7/1 to 2.8/1. The binder contains at least silicon oxide and is used in amount of 20-25 wt % of the weight of the catalyst. The process is carried out using the disclosed catalyst in an isothermic reactor without recycling separation gases by contacting the fixed catalyst bed with gaseous material evaporated and heated in a preheater.

EFFECT: achieving high output of aromatic hydrocarbons with virtually complete conversion of hydrocarbon material and oxygenates, high selectivity with respect to formation of xylenes in the concentrate of aromatic hydrocarbons while simplifying implementation of the process by using low pressure.

4 cl, 2 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of increasing a degree of conversion and selectivity in the process of obtaining an ester of α-hydroxycarboxylic acid from an amide of α-hydroxycarboxylic acid and an aliphatic alcohol, in which the amide of α-hydroxycarboxylic acid and the aliphatic alcohol are subjected to a gas-phase reaction in the presence of a zirconium dioxide-based catalyst at the reaction temperature from 150 to 270°C.

EFFECT: method is effective from the point of view of the industrial production by obtaining the method, as production expenditures are reduced with the simultaneous increase of the conversion degree and selectivity, with the considerable increase of the catalyst service term.

7 cl, 4 tbl, 46 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalysts, applied for obtaining hydrogen or synthesis-gas for the chemical production in processes of partial oxidation, steam reforming and autothermal reforming of a hydrocarbon raw material. Namely, the invention relates to a catalyst of oxidation reforming of hydrocarbon gases with obtaining carbon and hydrogen oxide, which contains metals of a platinum group and oxide composition, and the said metals of the platinum group include Pt, Pd and Rh, and the oxide composition is obtained from a mixture of hydroxides Al, Si and Zr with particles of oxides Ni, Mg and/or Ce with the size of 5-30 nm, obtained by a method of spray-pyrolysis of a Ni, Mg and/or Ce salts solution.

EFFECT: obtaining the catalytic system with high dispersity of active components, stabilised on the surface of the carrier and having a low speed of coalescence of active particles.

3 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst composition and methods (versions) of producing the catalyst composition for treating exhaust gases of internal combustion engines based on zirconium oxide, cerium oxide and yttrium oxide or based on zirconium oxide, cerium oxide and at least two oxides of rare-earth metals which are not cerium, with weight content of zirconium oxide of at least 20% and cerium oxide of not more than 70%. After calcination at 900°C for 4 hours, the composition contains two pore populations, the corresponding diameter of the first of which ranges from 20 to 40 nm and the second from 80 to 200 nm.

EFFECT: obtaining a catalyst composition with a defined optimum porosity.

18 cl, 3 tbl, 1 dwg, 15 ex

FIELD: chemistry.

SUBSTANCE: catalyst is characterised by the following content of components: 30-70 wt % (Mo5-12Sb>6.0-15Bi0.2-3M10.1-10M20.05-0.5M30.01-2On) and 70-30 wt % SiO2, where M1 is one or more elements selected from Co, Ni, Fe, Cr, Cu; M2 is one or more elements selected from Na, K, Cs, Mg, Ce, La, M3 is an element selected from P, B, n is a number defined by the valence and number of elements other than oxygen. The invention also relates to a method of producing butadiene-1,3 using said catalyst.

EFFECT: catalyst enables to achieve high butadiene selectivity in oxidative dehydrogenation of n-butenes and provides high output of butadiene.

3 cl, 1 tbl, 7 ex

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