Method of producing large spherical carbon carrier for catalysts
SUBSTANCE: invention relates to the technology of making carbon carriers for different types of catalysts and sorbents. Description is given of a method of making large spherical carbon carrier for catalysts, which involves heating a moving bed of palletised black to 800-900°C, feeding a stream of gaseous or vaporous hydrocarbons in the moving bed, packing the carbon black by thermal decomposition of hydrocarbons on the surface of its particles with formation of pyrocarbon until attaining 0.5-0.7 g/cm3 packed density of carbon black, cooling the mass of the material and its screening with separation of the fraction of granules, which are subjected to repeated pyrolytic packing with subsequent activation of the obtained product. This method is distinguished by that, gaseous or vaporous hydrocarbons are fed into the layer of carbon black at the first and second stages with different bulk speed: at the first stage with speed of 65-72 hour-1, and at the second stage at temperature 650-750°C and speed 52-58 hour-1. Granules with size 3.5-6.0 mm undergo packing at the second stage. Material is activated until attaining void space of 0.3-0.7 cm3/g. At the second stage packing using pyrocarbon is done until attaining weight of granules of 0.88-0.95 g/cm3.
EFFECT: obtaining a carrier with strong and composition homogenous granules.
2 cl, 2 ex
The invention relates to the technology for carbon carriers of various catalysts and sorbents.
A method of obtaining carbon granular material, comprising heating a moving layer of pre-classified into fractions by size 0,2-1,0 mm 1,0-3,0 mm 3,0-6,0 mm granulated carbon black in a rotating horizontal reactor, the flow in the moving layer of soot gaseous or vaporous hydrocarbons and their subsequent thermal decomposition of deposition of pyrocarbon on soot. When this process occurs in the temperature 900-1030°C, 800-900°C and 750-800°C for each of these fractions, respectively. In the production of carrier catalysts used fraction of 0.2-1.0 mm for suspension of processes and 2-3 mm for stationary processes in the layer (patent RF №2106375, CL SS 1/60, op. 10.03.1998).
The disadvantage of this method of obtaining carbon granular material is uneven compaction of the pellet fraction 3,0-6,0 mm on all cross-section, as at a temperature of 750-800°C in one stage, the depth of penetration of hydrocarbons in the pores and interparticle space of the material does not exceed 1.5 to 2.0 mm. In these conditions, the granules of carbon black treated with pyrocarbon at half volume and then when you activate the pellet is destroyed.
A method of obtaining carbon carrier for catalysts, cat is which includes heating a moving layer of granulated carbon black, used as the substrate, with a specific surface area of 10 to 30 m2/g and the amount of adsorption of dibutyl phthalate 95-115 ml/100 g, and the flow in the moving layer of soot gaseous or vaporous hydrocarbons which decompose on the surface of soot particles with the formation of a layer of pyrocarbon. This process of carburizing granulated carbon black lead in two stages. In the first stage soot compacted to achieve a bulk density of 0.5-0.7 g/cm3after which the process is stopped, the soot is cooled and subjected to sieving with the release fraction of granules with a size of 1.6-3.5 mm, which is then heated and compacted by pyrocarbon. When reaching the bulk density of the material, 0.9-1.1 g/cm3carry out the activation process. Activation of the material is produced at a temperature of 800-900°C by contact with water vapor or its mixture with the combustion products of the fuel. The process is conducted to obtain a product having a total pore volume, equal to 0.2-1.7 cm3/g (RF patent №2268774, CL B01J 37/08, op. 27.01.2006, prototype)
The disadvantage of this method of obtaining carbon carrier for catalysts is conducting pyrolytic seal of soot in the second stage under the same conditions as the first. This limits the possibility of a uniform volumetric compaction of soot with a granule size of 3.5-6.0 mm to the bulk density higher than 0, g/cm 3necessary to ensure the required strength of the granules after activation.
The aim of the present invention to provide a durable and uniform in properties of the carbon granules media (3,5-6,0 mm Material with these properties is used as a carrier in the preparation of catalysts for chemical processes, which are carried out in a reactor with a fixed bed of catalyst and low hydraulic resistance of the layer.
The proposed method for krupnoporistogo carbon carrier for catalysts includes heating a moving layer of granulated carbon black to a temperature of 800-900°C, feed him in a gaseous or vaporous hydrocarbons with a bulk velocity 65-72 h-1the seal carbon black by thermal decomposition of hydrocarbons on the surface of its particles with the formation of pyrocarbon to achieve a bulk density of carbon black 0.5-0.7 g/cm3cooling of the mass of material and sieving emitting krupnoperistye granules (3,5-6,0 mm Selected fraction of the large granules are subjected to re-pyrolytic condensation at a temperature of 650-750°C and space velocity of the hydrocarbon layer of soot 52-58 h-1to achieve a bulk density from 0.88 to 0.95 g/cm3with subsequent activation of the resulting carbon-carbon material until the value with marnoso pore size of 0.3-0.7 cm 3/year
Distinctive features of the present invention are different speeds of the feed hydrocarbons in a layer of soot on the first and second stages of propatria: the first with a bulk velocity 65-72 h-1and on the second -
52-58 h-1while the process of propatria in the second stage is conducted at a temperature of 650-750°C. And pyrolytic seal is subjected granules 3.5-6.0 mm, and the activation material is produced until the value of the total pore volume of 0.3-0.7 cm3/year
Another hallmark is the process of sealing the pyrocarbon in the second stage to achieve a bulk density from 0.88 to 0.95 g/cm3.
Offered for bid is a set of essential features of the invention allows to obtain a durable and uniform properties of granules (3,5-6,0 mm
The complexity of a uniform volumetric compaction of carbon black pyrocarbon when the granule size of 3.6-6.0 mm is that at high temperatures the layer of granules and high speed feeding of raw materials in the layer decomposition of hydrocarbons on the surface of soot particles in the pellet and the deposition of pyrocarbon happen at high speed. When this first occurs nauglerozhivaniya interparticle space in a surface layer of granules and adjacent soot particles with the formation of dense pyrocarbon the cover, impeding the access of hydrocarbons to the center of the pellets. This circumstance is exacerbated by the carburizing granules that are larger than 3 mm So uniform pyrolytic seal large granules (>3 mm) in the whole volume can be achieved at relatively low temperature layer pellets and feed rate of the hydrocarbon layer. However, this greatly increases the time of the carburizing process and reduce the productivity of the equipment. Therefore, the proposed method at different stages provides optimal for each stage of the process conditions. In the first stage, the process is conducted at 800-900°C and a feed rate of the hydrocarbon 65-72 h-1to the bulk density of 0.5-0.7 g/cm3i.e. before the formation of the "skin" of pyrocarbon. Then after classification in the second stage, the temperature of the layer of granules is reduced to 650-750°C and a flow rate of hydrocarbons to reduce 52-58 h-1.
This provides a reduction in the time seal of soot in the first stage and uniform deposition of pyrocarbon throughout the volume of the granules by reducing the speed of deposition of pyrocarbon on the diameter of the granules in the second stage of the process.
Reducing the feed rate of the hydrocarbon in the first stage below 65 h-1leads to lower productivity and higher to enter the 72 hour -1- to decrease the degree of conversion of hydrocarbons and deposition of pyrocarbon on the pellets of carbon black.
Reducing the temperature of the layer of granules of material in the second stage less than 650°C leads to lower productivity, and higher than 750°C to uneven deposition of pyrocarbon in the volume of the granules. The temperature conditions of the process determine the optimal feed rate of the hydrocarbon in the stratum granulosum of soot.
Decreasing space velocity of the hydrocarbon in the stratum granulosum in the second stage less than 52 hours-1increases the time of carburizing and, accordingly, reduce productivity, and increase the space velocity of the hydrocarbon over 58 h-1may contribute to incomplete decomposition of hydrocarbons on the surface of the particles.
The lower limit of the grain size of 3.5 mm, subjected to pyrolytic condensation in the second stage of the process, due to a limitation of the hydraulic resistance of the layer of granules of catalyst in chemical reactors, and the upper limit is 6.0 mm, limited by the penetration depth of the hydrocarbons in the granules.
The lower limit value of the total pore volume of 0.3 cm3/g - is needed to develop specific surface of the material, and the upper limit is 0.7 cm3/g is limited by the required strength of the granules.
The bottom paragraph is published by third parties the value of the bulk density of the granules is 0.88 g/cm3to which the lead seal in the second stage, due to the need to obtain granules with high strength carrier, and its upper limit is 0.95 g/cm3that limited the performance of the process, since a further increase in bulk density of the material increases production time.
The effectiveness of the proposed method and the necessity of its implementation to achieve the goal is illustrated by the following examples.
Example 1 (the prototype). In a preheated 400 With horizontal rotating reactor load 200 kg of granulated carbon black with a grain size of 1.0-6.0 mm and a specific surface area of 50 m2/, Then the reactor is heated to 850°C and in the layer continuously stir the carbon black pellets with a bulk velocity 69 h-1serves propane-butane mixture containing 50% propane and 50% butane. After pyrolytic seal soot for 20 hours until the value of the bulk density of the soot 0.6 g/cm3, carburizing stop, the material is cooled and classified into different fractions. For further work are selected fraction with grain sizes of 3.5 to 6.0 mm, Then the material is loaded into the heated reactor is again heated to 850°C. Then, in the layer continuously stir the material with the same bulk velocity serves propane-butane mixture of the same composition that lane on the stage,. After carburizing material for 15 hours to achieve a bulk density of 1.0 g/cm3feeding hydrocarbons stop, but instead for 15 hours serves a steam-air mixture. Activation of the material is conducted to obtain material with a total pore volume equal to 0.55 cm3/year
Properties of the obtained product:
|bulk density||0.40 g/cm3|
|the specific surface||520,0 m2/g|
|the total pore volume||0,55 cm3/g|
|the crushing strength||60,0 kg/cm|
|the coefficient of variation||0,63|
|(in terms of crushing strength)|
The coefficient of variation, which represents a relative measure of dispersion, expressed in percent, was calculated by the standard method.
Example 2 (present invention). The process of carbonization of carbon black in the first stage are as in example 1, but in the second stage and lower the processing temperatures up to 700°C, and the volumetric feed rate of the propane-butane mixture is about
55 h-1. The carburizing process in the second stage is carried out to achieve a bulk weight of the product of 0.90 g/see Activation material is conducted to obtain material with a total pore volume equal to 0.50 cm3/year
Properties of the obtained product:
|bulk density||0.52 g/cm3|
|the specific surface||480 m2/g|
|the total pore volume||0,50 cm3/g|
|the crushing strength||120,0 kg/cm|
|the coefficient of variation||0,52|
|(in terms of crushing strength)|
Thus, the analysis of the above data shows that the organization of the process of obtaining krupnoporistogo carbon carrier for catalysts with the use of the invention allows to obtain a product with a more solid and homogeneous granules. These properties allow it to be used as an effective carrier for catalysts used in various chemical processes, such as hydrogenation of fatty acids, the dehydrochlorination of methanol and others.
1. The method of obtaining krupnoporistogo carbon carrier for catalysts comprising heating a moving layer of granulated carbon black to a temperature of 800-900°C, the flow in the stream of gaseous or vaporous hydrocarbons, seal carbon black by thermal decomposition of hydrocarbons on the surface of its particles with the formation of pyrocarbon to achieve a bulk density of carbon black 0.5-0.7 g/cm3cooling of the mass of material and sieving emitting fraction of granules, which are subjected to a re-pyrolytic condensation with subsequent activation of the obtained product, characterized in that the gaseous or vaporous hydrocarbons are served in a layer of soot on the first and second stages with different bulk velocity: at the first stage - speed 65-72 h-1and on the second stage at a temperature of 650-750°C at the rate 52-58 h-1and pyrolytic condensation in the second stage is subjected granules 3.5-6.0 mm, and the activation material lead until the value of the total pore volume of 0.3-0.7 cm3/year
2. The method according to claim 1, characterized in that in the second stage seal pyrocarbon are to achieve a bulk density of pellets from 0.88 to 0.95 g/cm3.
SUBSTANCE: object of the present invention is to develop method for making catalyst to produce methacrylic acid by gaseous catalytic oxidation of metacrolein, isobutyl aldehyde or isobutyric acid. There is disclosed method for making catalyst to produce methacrylic acid by gaseous catalytic oxidation of metacrolein, isobutyl aldehyde or isobutyric acid, involving as follows: (a) the stage of mixing water and compounds, each containing any Mo, V, P, Cu, Cs or NH4, to prepare aqueous solution or dispersed compounds (further, both mentioned as a suspension); (b) the stage of drying suspension produced at the stage (a), to make dry suspension; (c) the stage of burning dry suspension produced at the stage (b), to make burnt substance; (d) the stage of filtrating mixed burnt substance produced at the stage (c) and water to separate aqueous solution and water-insoluble substance; and (e) the stage of drying water-insoluble substance produced at the stage (d) to make dry water-insoluble substance; and (f) the stage of coating the carrier with dry water-insoluble substance produced at the stage (e), with using a binding agent to make coated mould product, and (g) the stage of burning coated mould product produced at the stage (f) in inert gas atmosphere, in the air or with reducing agent added.
EFFECT: making catalyst with long life, high activity and selectivity.
8 cl, 9 tbl, 9 ex
SUBSTANCE: invention claims methods for obtaining calcinated zirconium dioxide extrudates (variants) for application as carrier or catalyst containing zirconium and one or more other elements selected out of IB, IIB, IIIB, IVB, VB, VIB, VIIB and VIII groups of periodic element system, or lanthanides and actinides, involving the following stages: a. Obtaining formed paste by mixing and plastifying of fine dispersed zirconium dioxides and source of one or more other elements selected out of IB, IIB, IIIB, IVB, VB, VIB, VIIB and VIII groups of periodic element system, or lanthanides and actinides, and solvent, to obtain mix containing 50 to 85 wt % of solid substances, b. extrusion of formed paste to obtain zirconium dioxide extrudate containing zirconium and one or more other elements selected out of IB, IIB, IIIB, IVB, VB, VIB, VIIB and VIII groups of periodic element system, or lanthanides and actinides, and c. Drying and calcination of zirconium dioxide extrudate formed on b. stage, with fine dispersed zirconium dioxide containing under 15 wt % of zirconium dioxide other than monocline zirconium dioxide. Also invention claims calcinated zirconium dioxide extrudates obtained by the described method, and cobalt-saturated extrudate and its application in method for obtaining higher olefins in Fischer-Tropsch reaction.
EFFECT: enhanced crush durability of zirconium dioxide extrudates.
16 cl, 3 tbl, 12 ex
SUBSTANCE: catalyst of pyrolysis of propane-butane hydrocarbon material with the formation of the ethylene and the propylene, which presents itself directly on the surface of the reactor of the ceramic catalytic film covering with a mass of 50-70 g/m2, having the gross weight-composition, moll %: mixture ZnO and CdO - 20÷30, SiO2 - 20÷40, P2O5 40÷50 with heterogeneous chemical compound through the thickness of the coating. Also another method of obtaining the catalyst is described. It is obtained by processing the surface of the reactor by aqueous solutions or suspensions of the compounds of zinc, cadmium, silicon and phosphorus or their mixtures - ashes-gel method, drying of the coating at 80-100°C and heat processing at 200-400°C for the formation the ceramic catalytic film coating.
EFFECT: obtaining active and selective catalyst for pyrolysis of propane-butane hydrocarbon material without the formation of coke with a high output of ethylene and a low output of propylene.
2 cl, 1 tbl
FIELD: technological processes.
SUBSTANCE: subject of invention is method of catalytically active lamellar silicates production with single or multiple layers, in particular, clays with interlaminar struts from A1 and/or Ti, for purification of spent gases. At that at the stage of interlaminar struts formation, metal solution is added into lamellar silicate and the received mixture at the stage of drying/calcination is heated with formation of struts supporting intermediate layer out of metal atoms. After that catalytically active salt of transition metal is added in the dry form to the received dry substance. Finally the prepared dry mixture is heated up to the temperature of higher than 300°C, as a result catalytically active transition metal atoms are introduced into immediate layer, and at the same time dry mixture calcination takes place. As metal solution, solutions of aluminium, titanium, iron, copper and chrome are used. As catalytically active salt of metal, in particular, nitrate or sulphate of copper, titanium or lanthanum are used.
EFFECT: method allows to relatively quickly obtain catalytically active lamellar silicates without exhausts.
15 cl, 1 ex, 1 tbl, 1 dwg
FIELD: industrial organic synthesis catalysts.
SUBSTANCE: method of improving selectivity of highly selective epoxidation catalyst on support containing silver in amount at most 0.19 g per 1 m2 of the support surface area comprises bringing catalyst or catalyst precursor containing silver in cationic form into contact with oxygen-containing raw material at catalyst temperature above 250°C over a period of time more than 150 h, after which catalyst temperature is lowered to at most 250°C. Olefin epoxidation process comprises bringing above-described supported catalyst or catalyst precursor into contact with oxygen-containing raw material at catalyst temperature above 250°C over a period of time more than 150 h, after which catalyst temperature is lowered to at most 250°C and catalyst is brought into contact with raw material containing olefin and oxygen.
EFFECT: increased selectivity of catalyst.
12 cl, 3 tbl, 12 ex
FIELD: carbon materials.
SUBSTANCE: invention relates to porous carbon materials and, more specifically, to carbon catalyst supports and sorbents. Preparation of catalyst support is accomplished by mixing carbon material with gaseous hydrocarbons at 750-1200°C until mass of carbon material increases by 2-2.5 times, after which resulting compacted material is oxidized, said initial carbon material being preliminarily demetallized carbon nanofibers.
EFFECT: increased sorption capacity of material.
1 tbl, 6 ex
FIELD: carbon materials.
SUBSTANCE: invention relates to porous carbon materials and, more specifically, to carbon catalyst supports and sorbents. Preparation of catalyst support is accomplished by treating carbon black with hydrocarbon gas at heating and stirring until mass of carbon material increases by 2-2.5 times, after which resulting compacted material is oxidized, said hydrocarbon gas being gas originated from liquid hydrocarbon electrocracking and said treatment being carried out at 400-650°C.
EFFECT: simplified technology.
1 tbl, 6 ex
FIELD: petroleum processing catalysts.
SUBSTANCE: catalyst containing platinum, rhenium, antimony, and chlorine on alumina are prepared by impregnation of carrier with aqueous solution of compounds of indicated elements, antimony being deposited as first or second component. Once antimony or platinum-antimony combination, or rhenium-antimony combination deposited, catalyst is dried at 130°C and then calcined in air flow at 500°C. Reduction of catalyst is performed at 300-600°C and pressure 0.1-4.0 MPa for 4 to 49 h. After deposition of antimony or two elements (platinum-antimony or rhenium-antimony) and drying-calcination procedures, second and third or only third element are deposited followed by drying and calcination. Final reduction of catalyst is accomplished in pilot plant reactor within circulating hydrogen medium at pressure 0.3-4.0 MPa and temperature up to 600°C for a period of time 12 to 48 h.
EFFECT: enhanced aromatization and isomerization activities of catalyst and also its stability.
2 cl, 1 tbl, 8 ex
FIELD: exhaust gas afterburning means.
SUBSTANCE: invention relates to catalytic neutralizer for treating internal combustion engine exhausted gases. Proposed catalyst is composed of catalytically active coating on inert ceramic or metallic honeycomb structure, wherein coating contains at least one platinum group metal selected from series including platinum, palladium, rhodium, and iridium on fine-grain supporting oxide material, said supporting oxide material representing essentially nonporous silica-based material including aggregates of essentially spherical primary particles 7 to 60 nm in diameter, while pH of 4% water dispersion of indicated material is below 6.
EFFECT: increased catalyst activity and imparted sufficient resistance to aggressive sulfur-containing components.
27 cl, 2 dwg, 7 tbl, 6 ex
FIELD: petroleum processing and catalysts.
SUBSTANCE: invention relates to catalyst for steam cracking of hydrocarbons, which catalyst contains KMgPO4 as catalyst component. Catalyst is prepared by dissolving KMgPO4 precursor in water and impregnating a support with resulting aqueous solution of KMgPO4 precursor or mixing KMgPO4 powder or its precursor with a metal oxide followed by caking resulting mixture. Described is also a light olefin production involving steam cracking of hydrocarbons.
EFFECT: increased yield of olefins, reduced amount of coke deposited on catalyst, and stabilized catalyst activity.
21 cl, 4 tbl, 14 cl
SUBSTANCE: described is catalyst for obtaining alkylene oxide by alkene epoxidation in steam phase, which contains applied by impregnation silver and at least one promoter on burnt heatproof solid carrier, and said carrier contains quantity of zirconium component, which is present in carrier mainly as zirconium silicate, and said heatproof carrier, with the exception of zirconium component at least on 95% by weight consists of aluminium alpha-oxide. Also described is method of said catalyst obtaining which includes: a) mixing of zirconium component, which is mainly present as zirconium silicate, with initial materials of carrier, which include aluminium oxide; b) burning of initial materials of carrier with added zirconium component at temperature less than 1540°C with formation of carrier, which includes aluminium alpha-oxide, where carrier includes zirconium component, present mainly as zirconium silicate; c) further deposition of silver and at least one promoter on carrier. In addition, described is method of catalyst application for alkyl oxide obtaining.
EFFECT: improvement of catalyst stability and activity.
23 cl, 10 tbl, 7 ex
SUBSTANCE: catalyst carrier contains 10-98% by weight of titanium dioxide (mainly in anatase form) and 2-90% by weight of kieselgur.
EFFECT: increase of the erosion stability, decrease of the abrasion losses.
2 cl, 4 tbl, 4 ex
SUBSTANCE: present invention relates to catalysts for autothermal conversion of biodiesel to obtain synthetic gas. Synthetic gas can be used in chemical production, for combustion in catalytic heating plants and in hydrogen power generation. The proposed catalyst for obtaining synthetic gas contains active components in form of cobalt oxide, manganese oxide and barium oxide, and a heat resistant reinforced porous metallic carrier. The catalyst is prepared by impregnating the carrier with a solution of barium and manganese salts, drying and then heat treatment. The carrier is then impregnated with a solution of cobalt salt with subsequent drying and calcination. Described also is a method of obtaining synthetic gas through autothermal conversion of biodiesel fuel, using the above described catalyst.
EFFECT: catalyst is characterised by high heat conductivity and is highly active in producing synthetic gas, resistant to coke formation and deactivation by sulphur compounds, contained in the biodiesel fuel.
6 cl, 1 tbl, 4 ex
SUBSTANCE: present invention refers to powder catalyst support and related exhaust treating catalyst. There is disclosed powder catalyst support containing cerium dioxide and zirconium dioxide where molar concentration (mol. %) of cerium dioxide on powder catalyst surface under measurements of X-ray photoelectron spectroscopy to molar concentration (mol. %) of cerium dioxide in source material is within 1.0 to 1.5. Besides, in the present invention there is disclosed exhaust treating catalyst containing said powder support with coated platinum.
EFFECT: higher thermal stability and catalytic activity of the catalyst.
10 cl, 3 dwg, 2 tbl
SUBSTANCE: invention discloses the compound applicable for NOx release reducing in catalytic cracking process with fluid bed. There is disclosed compound containing (i) acid-oxide support, (ii) transition metal of VIII group of the Periodic table in amount 0.0001 to 10 weight fractions (measured as metal) or its salt per 100 weight fractions of acid-oxide support and (iii) metal oxide in amount 2 to 50 weight fractions (measured as metal) accumulating oxygen per 100 weight fractions of acid-oxide support. Herewith the compound does not contain platinum or palladium. Besides there is suggested cracking catalyst and method for reducing NOx release.
EFFECT: effective NOx release reducing.
11 cl, 3 tbl, 16 ex
SUBSTANCE: invention refers to defect noble metal nanoparticles (Pt, Pd, Rh, Ru, Os, Ir) on carriers or without carriers and to methods of production thereof to be applied for making catalysts for various catalytic processes, e.g. for hydrogenation and partial oxidation of organic compounds, as well as for fuel cell anodes. There are disclosed noble metal nanoparticles on carrier or without carrier with defect structure including vacancies in number 10-3-10-4 pc./metal atom. Noble metals are Pt, Pd, Rh, Ru, Os, Ir or mixed. Noble metal nanoparticles with defect structure are prepared by partial alkali leaching of active component. Alkali is Li, Na, K, Rb, Cs, Ca, Sr, Ba compounds.
EFFECT: making defect structure of noble metal nanoparticles.
5 cl, 1 tbl, 3 dwg, 2 ex
SUBSTANCE: there is disclosed selective oxidation catalyst of gas hydrogen sulphide to element sulphur on carbon carrier containing natural ferric oxide. Herewith catalyst is additionally introduced with ferric oxide in amount 0.5-2.0 wt % and magnesium oxide in amount 0.1-0.5 wt % on metal basis. Substrate is high-ash microcellular carbon carrier made of low-caking fossil coal by crushing, water granulation, drying, carbonisation in inert medium, and gas-vapour activation. Besides, there are described method of catalyst production and method of gas desulphurisation.
EFFECT: production of new catalyst ensuring comprehensive adsorption catalytic removal of hydrogen sulphide in gas, improved engineering-and-economical performance ensured with temperature reduction, higher sulphur content and catalyst service life.
5 cl, 2 tbl, 31 ex
SUBSTANCE: carbon-black paste and gas obtained during electrocracking of liquid organic products are used as raw material for obtaining carrier. Carbon-black paste is a mix of carbon-black and high-molecular organic compounds absorbed on its surface. Electrocracking gas includes hydrogen, acetylene, C1-C4 alkanes, C2-C4 alkenes. Carbon-black paste is fed to drying aggregate and dried at 130-150°C in air atmosphere for 160-180 minutes, granulated, fed to reactor and exposed to 750-850°C in inert gas atmosphere for 100-120 minutes. Then temperature is lowered to 450-550°C, and processing by electrocracking gas is performed. Compressed material obtained is processed by oxidation agent (steam and air mix, carbon dioxide). For that purpose electrocracking gas supply to reactor is stopped, reactor temperature is increased to 750-900°C, then oxidising agent is fed until sample weight reduction by 7-60%.
EFFECT: material with enhanced adsorption surface.
1 tbl, 21 ex
SUBSTANCE: alloy contains (wt %): from 2.5 till 5.0% Al, from 10 till 25% Cr and from 0.05 till 0.8% Si, and also admixtures from >0.01 till 0.1% Y and/or from >0.01 till 0.1% Hf, and/ or from >0.01 till 0.2% Zr, and/ or from >0.01 till 0.2% of misch metal with high content of cerium (Ce, La, Nd), and also attached foreign material and it is used for manufacturing details of diesel or two-cycle engine. Those details are: foil - carrier of metallic catalyst of discharge gases neutralisation, heater element or resistance material for electrical heating of purification system of discharge gas.
EFFECT: enough durability against oxidation at high temperature range.
8 cl, 2 dwg, 1 tbl
SUBSTANCE: catalyst includes stabilised carrier and catalytic metal. Stabilised carrier is obtained by processing boehmite in presence of structural stabiliser. Mixture is obtained, which contains boehmite and one structural stabiliszer compound, obtained mixture is dried, dry mixture including boehmite and, at least, one structural stabiliser, and dry mixture is tempered with obtaining stabilised carrier. It is described method of obtaining carrier (version), in which boehmite is dispersed in solvent and as a result sol is obtained, obtained sol is dried and dry boehmite is obtained, after that on obtained boehmite structural stabiliser compound is applied and as result carrier precursor is obtained, which includes boehmite and structural stabiliser and after that obtained carrier precursor is processed with obtaining stabilised carrier. It is described catalyst for obtaining hydrocarbons from synthesis-gas, which includes catalytically active metal, selected from group: cobalt, ruthenium, iron, nickel and their combinations, by choice, promoter, and stabilised carrier, obtained by method, which includes obtaining mixture, including boehmite and one structural stabiliser compound, drying of mixture and tempering of dry mixture, average size of stabilised carrier pores being more than 4 nm, and surface area - more than 30 m2/g of carrier, and its use in method of obtaining hydrocarbons from synthesis-gas.
EFFECT: higher hydrothermal stability of catalyst.
86 cl, 1 dwg, 2 tbl, 10 ex
SUBSTANCE: invention claims the method of the electrocatalyst synthesis on the base of the precious metals sulphide including the following stages: 1) reaction of the precursor solution (at least one noble metal) with water solution containing thionic compound in the media not containing the substantial amounts of sulphide ions whereby the said precursor solution contains the carbon particles; 2) separation of the formed catalyst and its thermic treatment.
EFFECT: elaboration of the catalyst synthesis method on the base of the noble metals sulphides in water media without using of highly inflammable and highly toxic compounds.
12 cl, 4 ex