Method of preparing catalyst for dehydration of paraffinic hydrocarbons
SUBSTANCE: described is method of catalyst preparation, which consists in impregnation of product of thermochemical activation of hydrargillite by active components under microwave radiation with operating frequency 2.46 GHz and power 180-900 Wt for 3-30 min with the following drying in electromagnetic field of ultrahigh-frequency range and incineration at temperature from 600 to 800°C.
EFFECT: increase of method productivity, high mechanical strength and thermal stability of catalyst, increase of catalytic properties.
2 tbl, 4 ex
The invention relates to the field of oil refining and catalytic chemistry, in particular to a method of synthesis of a catalyst for the dehydrogenation of light paraffin hydrocarbons, preferably isobutane and isopentane, for production of isobutylene and isoamylenes - monomers of synthetic rubbers.
Known impregnation method for the synthesis of the catalyst in the dehydrogenation of paraffins, which is impregnated alumina carrier with the desired properties of the solution of active components and promoters and subsequent heat treatment (drying and calcining of the catalyst). Stage drying is conducted in a traditional way in the laboratory on a sand bath or in an oven, in industry - in apparatus with stirrer, equipped with a steam jacket [Karimov O. H. investigation of the drying process alimohammadi catalyst in the electromagnetic field of the microwave range / Karimov O. H., Damini P. P., Kasyanov L. H., Karimov, E. H., Vakhitova P. P. // Oil and gas business: electronic scientific journal. No. 4, 2013. - 291-301 http://www.ogbus.ru/authors/KarimovOKh/KarimovOKh_l.pdf].
The disadvantage of drying by convective method are the high energy costs associated with the creation of heat in the reaction zone, and the duration of the stage of drying.
A method of obtaining oxide catalysts, which consists in mixing two or more salts of predshestvennikami catalyst, melting the mixture until a homogeneous melt, cooling the melt to room temperature, the decomposition of the molten salt to the oxide under the action of microwave radiation and subsequent calcination [RF Patent №2301705 C1, B01J 37/34, B01J 35/12, B01J 23/10, B01J 23/70, publ. 27.06.2007].
Known chemical method of obtaining alimohammadi catalyst for dehydrogenation of hydrocarbons. This method includes a heat treatment of the raw materials taken in the form of powders of aluminum and chromium carbonyl in air flow low-temperature microwave plasma, and the reagents are served in the flow of air plasma and the reactor separately in the form of an aerosol carrier gas argon [RF Patent №2347613 C1, B01J 37/34, B01J 21/04, B01J 23/26, B82B 3/00, publ. 27.02.2009]. Or to get alimohammadi catalyst in a stream of microwave plasma fused oxides of aluminum and chromium [RF Patent №231.8597 from 10.03.2008].
The disadvantage of these methods is the technical complexity of the process, including, including additional stages of oxidative processing reagents fused catalyst, evaporation of the excess reagent, drying and calcination of the catalyst.
There is a method of preparation of the catalyst for dehydrogenation of paraffin hydrocarbons by impregnation [RF Patent 2432203 C1, B01J 23/26, B01J 21/04, B01J 23/02, B01J 23/745, B01J 21/10, C07C 5/333, publ. 27.10.201]. The process of preparation of the catalyst involves the impregnation product thermochemical activation hydrargillite solutions of chromium compounds, alkali metal, iron, calcium, magnesium, drying and calcination at a temperature of 650-800°C. Mainly impregnation takes place simultaneously all the components of the catalyst capacity at a temperature of 20-50°C.
The disadvantage of this method is the duration of the stages of impregnation and drying is carried out at 120°C, which is up to 4 hours, which leads to high energy costs.
The closest technical solution to the present method of preparation of the catalyst is a method based upon the use of electromagnetic radiation in the microwave range at the stage of drying alimohammadi catalyst [Karimov O. H., Damini P. P., Kasyanov L. H., Karimov, E. H. the Use of microwave radiation in the preparation of metal oxide catalysts // Fundamental research. - 2013. No. 4. - S. 801-805]. The catalyst was impregnated with a solution of active ingredients, dried under the action of electromagnetic radiation in order to intensify the drying process.
The disadvantage of this method is the duration of the stage of impregnation of the catalyst due to diffusion processes on the catalyst surface. The duration of the impregnation, providing uniform distribution with the joining of chromium and potassium, may take up to 1 hour.
Problem to be solved in the invention is to develop a method of producing a catalyst for dehydrogenation of paraffin hydrocarbons, which improves the physico-chemical and catalytic properties of the catalyst and increases the productivity of its preparation impregnation method by intensifying stage of impregnation of the carrier with a solution of active components.
To solve the problem in the preparation method of catalyst for dehydrogenation of paraffin hydrocarbons by impregnation product thermochemical activation hydrargillite solutions of chromium compounds and alkali metal, followed by drying electromagnetic radiation and calcination of the catalyst according to the invention stage impregnation carried out under the action of electromagnetic radiation at the operating frequency of 2.45 GHz and power 180-900 W within 3-30 minutes
Product thermochemical activation hydrargillite, which is a carrier for the catalyst and the precursor of aluminium oxide, obtained by dehydration under conditions of pulsed heating hydrargillite Al(OH)3. The product has high reactivity, and is easily hydrated in the presence of water or vapor environment with the formation of aluminum hydroxide patterns AlOOH. This connection has a high reaction capable of the flesh, as a result of which it becomes possible the impregnation of the carrier based on the product of thermochemical activation hydrargillite compounds active catalyst components. In the impregnation compounds of chromium and alkali metal not only evenly distributed in the alumina, but also chemically bound with the compound of aluminium. The use of microwave effects on heterogeneous catalysts in the process of their preparation allows in some cases to obtain catalysts with a more uniform particle distribution. So, processing of the electromagnetic field of the dried catalyst for the synthesis of ethylene oxide allows to obtain a fine distribution of silver ions on the catalyst surface [Patent US 8017546 13.09.2011].
In the process of impregnation of the carrier in the electromagnetic field of the media is heated to 110°C, which accelerates the diffusion of active components on the catalyst surface. Drying of the catalyst is conducted in the electromagnetic field of the microwave range. Preferably the use of microwave radiation with a frequency of 2.45 GHz. The radiation power is 10-2000 W, preferably 180-900 W, the duration of radiation up to 30 minutes to complete removal of the aqueous solvent from the catalyst.
In the preparation of the catalyst in the electromagnetic field of the microwave range maximum is W hen operations of impregnation and drying of the catalyst is reduced from 4 hours to 1 hour. It was also established that lomography the catalyst prepared by this method have high catalytic performance (activity and selectivity), mechanical strength and thermal stability.
The resulting catalyst was tested in a laboratory reactor at 50 cm3in the process of dehydrogenation of isopentane at a temperature of 550°C, at a space velocity of isopentane 1 hour-1(liquid). The catalytic cycle consists of the reaction phase, in which the hydrocarbons are served within 30 minutes; phase purging with nitrogen for 10 minutes to release the catalyst from the adsorption of the reaction products of dehydrogenation; regeneration phase, when in the regenerator the gas is fed to the regeneration air for 30 minutes at a temperature of 650°C.
In the analysis of catalysts using the following methods.
Thermal stability of the catalyst test using Express methods by annealing at 800°C for 4 hours. The abrasion resistance is determined by the fraction of total mass loss during abrasion of the catalyst particles. The method is based on the destruction of the catalyst particles in the fluidized layer and measuring the mass of particles carried by the air flow, the speed of which is stabilised.
The invention is illustrated by the following examples.
Example 1 (the prototype)./p>
For the preparation of the catalyst compound of aluminum (product of thermochemical activation hydrargillite) in the form of microspherical powder impregnated with constant stirring a solution containing chromic anhydride and potassium lye. All components taken in such quantities, to ensure that after calcination the catalyst composition, wt.% (in terms of oxides: chromium oxide (in terms of Cr2O3) 13,0; the oxide of the alkali metal 2; aluminium oxide - rest. The impregnation is carried out at room temperature for 1 hour, followed by drying in an electromagnetic field with a frequency of 2.45 GHz, power irradiation 900 watts for 3 minutes. The dried catalyst is calcined at a temperature of 660°C for 6 hours. Physico-chemical and catalytic properties of the catalyst are presented in table 1. Comparative results of thermal stability of the catalysts are presented in table 2.
The catalyst is prepared analogously to example 1, with the difference that the impregnation solution active components are under the influence of electromagnetic field frequency of 2.45 GHz, the radiation power of 180 watts for 5 minutes. Physico-chemical and catalytic properties of the catalyst are presented in table 1. Comparative results of thermal stability of the catalysts are presented in table 2.
Catalysis is tor is prepared analogously to example 1, with the difference that the impregnation solution active components are under the influence of electromagnetic field frequency of 2.45 GHz, the radiation power of 180 watts for 10 minutes. The dried catalyst was calcined at 700°C for 6 hours. Physico-chemical and catalytic properties of the catalyst are presented in table 1. Comparative results of thermal stability of the catalysts are presented in table 2.
The catalyst is prepared analogously to example 3, with the difference that the impregnation solution active components are under the influence of electromagnetic fields 22 minutes. Physico-chemical and catalytic properties of the catalyst are presented in table 1. Comparative results of thermal stability of the catalysts are presented in table 2.
|Physico-chemical and catalytic properties|
|Indices||Example 1||Example 2||Example 3||Example 4|
|Abrasion, %||90,1||92,0||to 92.191,2|
|The content in the catalyst Cr+6, wt.%||the 4.7||5,2||4,8||4,3|
|Activity* catalyst in the process||44,6||48,1||43,0||40,1|
|dehydrogenation of isopentane, %|
|Selectivity* catalyst in dehydrogenation of isopentane, %||82,1||87,1||80,6||82,5|
|* Catalytic performance output unsaturated hydrocarbon, C5.|
|The results of Express-methods for determining thermal stability of the catalysts|
|A sample of catalyst||The content of Cr6+, wt.%||Loss of Cr6+after the rosalki, %|
|Source||After calcination 800°C, 4 h|
A method of producing a catalyst for dehydrogenation of paraffin hydrocarbons by impregnation product thermochemical activation hydrargillite solutions of chromium compounds and alkali metal, followed by drying electromagnetic radiation and calcination of the catalyst, characterized in that the stage of impregnation carried out under the action of electromagnetic radiation at the operating frequency of 2.45 GHz and power 180-900 W within 3-30 minutes
SUBSTANCE: dehydration catalyst represents aluminium oxide carrier, modified with silicon oxide, on which active component chrome oxide and promoter potassium oxide are distributed. Silicon oxide is fixed on aluminium oxide in form of silicon oxide structures Si(OSi)n(O-)4-n, where n is from 1 to 4, in which silicon in spectrum NMR MAS 29Si is characterised by presence of lines with chemical shifts from -95 to -105 ppm (line Q3) and from -107 to -124 ppm (line Q4) with ratio of integral intensities Q3/Q4 from 0.5 to 1.5, with chrome in active component being characterized in UV-Vis-spectrum of diffuse reflection by band of absorption of d-d electronic transition of octahedral Cr(III) cation with wave number from 16500 to 17000 cm-1. Catalyst has specific surface value from 10 to 250 m2/g, volume of pores not less than 0.15 cm3/g, and its composition is formed in the following ratio, wt %: chrome oxide - 8-20, potassium oxide- 0.1-5, silicon oxide - 0.1-5, aluminium oxide carrier - the remaining part.
EFFECT: claimed catalyst of paraffin hydrocarbons possesses high activity, selectivity and thermal stability.
3 cl, 2 dwg, 1 tbl, 17 ex
SUBSTANCE: invention relates to processes of paraffin dehydration. A method for the regulation of temperatures in a dehydration reactor includes the supply of a catalyst into the dehydration reactor in such a way that the catalyst flows downwards via the reactor, supply of the flow, enriched with paraffins, into the dehydration reactor in such a way that the flow passes upwards via the reactor with the formation of a technological flow, which contains the catalyst and dehydrated hydrocarbons, as well as a certain amount of non-converted paraffins, separation of a vapour phase from the technological flow with the formation of a flow of products, supplying the flow of products into a cooling unit with the formation of a cooled flow of products and the supply of a part of the cooled flow of products into the technological flow.
EFFECT: invention provides the effective and economical dehydration process with the prevention of undesirable side reactions.
10 cl, 1 dwg
SUBSTANCE: invention relates to a method of carrying out reactions of dehydration with further absorption purification of gases, with the absorption gas purification followed by a stage of pressure release in a reservoir of high pressure flash evaporation, provided by mass-exchange elements, with the said stage being carried out with the application of combustible gas, flowing through the mass-exchange elements towards gravity direction, which passes through the high-pressure flash evaporation reservoir in a counterflow with respect to a solvent, subjected to pressure release, so that the absorbed hydrocarbons are absorbed by combustible gas. Combustible gas is represented by fuel gas, used for heating the dehydration reactor and which, for instance, is natural gas. To increase the process efficiency the flow of carbohydrates, separated from acid-forming gases, can be returned back into a channel of technological gas before absorption purification of gases.
EFFECT: method provides a possibility of an improved separation of carbon dioxide and hydrocarbons in the process of removal of acid-forming gases.
13 cl, 2 tbl, 1 dwg
SUBSTANCE: invention relates to a method of propane dehydrogenation, which includes passing of a preliminarily heated initial propane flow into a dehydrogenation reactor, mixing and interaction of the initial propane flow with a non-metallic fluidised catalyst, which contains zirconium oxide, in the dehydrogenation reactor, which represents a reactor of fast fluidisation with formation of a flow of a propylene-containing product. The catalyst is in the reactor with the average time of presence from 15 to 45 minutes; passing of a waste catalyst into a catalyst regeneration unit with formation of a flow of a regenerated catalyst; and passing the flow of the regenerated catalyst into the dehydrogenation reactor.
EFFECT: application of the claimed method makes it possible to increase the passing capability of the system.
8 cl, 1 dwg
SUBSTANCE: present invention relates to a mesoporous carbon-supported copper-based catalyst, a method for production and use thereof in catalytic dehydrogenation of a compound with a C2-C12 alkyl chain to convert said compound to a compound with a corresponding alkenyl chain. The catalyst contains mesoporous carbon, a copper component and an auxiliary element supported on said mesoporous carbon. One or more auxiliary elements (in form of oxides) are selected from a group consisting of V2O5, Li2O, MgO, CaO, Ga2O3, ZnO, Al2O3, CeO2, La2O3, SnO2 and K2O. The amount of the copper component (calculated as CuO) is 2-20 wt % based on the total weight of the catalyst. The amount of the auxiliary element (calculated as said oxide) is 0-3 wt %. The amount of the mesoporous carbon is 77.1-98 wt % based on the total weight of the catalyst. The method of producing the catalyst involves: (1) a step of contacting a copper component precursor, auxiliary element precursor and mesoporous carbon in a given ratio to form an intermediate product and (2) a step of calcining the intermediate product to obtain the mesoporous carbon-supported copper-based catalyst.
EFFECT: catalyst is cheap, environmentally safe and has high thermal stability and caking resistance with considerably high and relatively stable catalytic activity.
19 cl, 47 ex
SUBSTANCE: described is a method of producing C3-C5 olefin hydrocarbons via dehydrogenation of corresponding C3-C5 paraffin hydrocarbons or mixtures thereof in the presence of a catalyst which contains chromium oxide, zinc oxide, aluminium oxide and additionally a aluminium-magnesium spinel and at least tin oxide in amount of 0.1-3.0 wt %. Before the regeneration step, reaction products are removed from the catalyst by first passing C1-C5 hydrocarbons or mixtures thereof and then nitrogen through the catalyst. The catalyst contains chromium oxide, zinc oxide, aluminium oxide, aluminium-magnesium spinel and tin oxide, with the following ratio of components in terms of oxides, wt %: Cr2O3 - 10.0-30.0, ZnO - 10.0-40.0, SnO2 - 0.1-3.0, MgO - 1.0-25.0, Al2O3 - the balance. The catalyst can further contain a manganese compound in amount of 0.05-5.0 wt %.
EFFECT: high efficiency of the process of producing olefin hydrocarbons.
3 cl, 1 tbl, 11 ex
SUBSTANCE: method is characterised by contacting a gas stream containing at least one of said hydrocarbons with a dehydrogenation catalyst containing gallium and platinum and deposited on a support made of aluminium oxide or aluminium oxide and silicon dioxide, at reaction temperature in a direct-flow, upward stream with weight ratio of catalyst to hydrocarbon of 5 to 100 in a dehydrogenation reactor, wherein the average contact time of the hydrocarbon with the catalyst in the zone of the dehydrogenation reactor ranges from 1 s to 4 s, and temperature and pressure in the dehydrogenation reactor range from 570 to 750°C and from 41.4 (6.0) to 308 (44.7) kPa (psia); and moving the hydrocarbon and the catalyst from the dehydrogenation reactor into a separation device, wherein the average contact time of the hydrocarbon with the catalyst at reaction temperature in the separation device is less than 5 s, and the full average contact time between the hydrocarbon, catalyst and the formed hydrocarbons is less than 10 s; and moving the catalyst from the separation device into a regenerator, where the catalyst is brought into contact with an oxygen-containing regenerating stream and additional fuel.
EFFECT: method has short contact time between the hydrocarbon and the catalyst.
7 cl, 5 dwg
SUBSTANCE: disclosed is a method of determining resistance of an alkyl aromatic hydrocarbon dehydrogenation catalyst to catalyst poisons, said catalyst containing an alkali metal, the method involving treating the catalyst with a mixture which contains an alkyl aromatic hydrocarbon and 1-10% aqueous hydrochloric acid solution in ratio of 1:2…1:3, at temperature of 550-650°C, holding the sample for 3 hours; in order to dehydrogenate the alkyl aromatic hydrocarbons, the dealkylisation degree is determined using the formula:
EFFECT: method for rapid determination of resistance of an alkyl aromatic hydrocarbon dehydrogenation catalyst, which contains an alkali metal, to catalytic poisons.
1 tbl, 5 ex
SUBSTANCE: initial hydrocarbon raw material is initially separated and first part of initial raw material is introduced into first zone of dehydration reaction, which functions without oxidation re-heating, and obtained as a result output flow is introduced into second zone of dehydration reaction, which functions without oxidation re-heating. Obtained as a result output flow from second zone of dehydration reaction, together with second part of initial raw material is introduced into third zone of dehydration reaction, which functions with oxidation re-heating.
EFFECT: increased method productivity.
10 cl, 1 dwg
SUBSTANCE: present invention relates to a catalyst and a method for continuous oxidative dehydrogenation of paraffins to corresponding olefins, specifically ethane to ethylene. Described is a catalyst for continuous oxidative dehydrogenation of ethane to ethylene, which contains a mixed oxide catalyst phase which contains ions of metals such as vanadium, molybdenum, niobium, tellurium or antimony, deposited on a support in form of an inert gas-permeable porous ceramic membrane with a deposited mixed oxide catalyst phase on the outer side of the membrane surface. Described also is a method for continuous oxidative dehydrogenation of ethane to ethylene in the presence of the disclosed catalyst by feeding an ethane-containing gas onto the outer side of the membrane surface coated with catalyst, and an oxygen-containing gas is fed onto the inner side of the membrane surface which is not coated with catalyst at temperature of 300°C-550°C, pressure ranging from atmospheric pressure to 10 MPa and volume rate of feeding material of 500-2000 h-1.
EFFECT: increase in ethylene selectivity to 98% and output of the process from 800 to 1400-2240 g/h per kg catalyst, high process safety since it enables to separate the hydrocarbon stream from the stream of oxygen-containing gas, thereby minimising the probability of their mixing, thus preventing formation of explosive mixtures.
4 cl, 1 tbl, 8 ex
SUBSTANCE: invention relates to methods of obtaining photocatalyst based on semiconductor tin (II) oxide for decomposition of nitrogen-containing organic water pollutants, which can be applied in chemical industry in purification of sewage waters. Method includes preparation of tin (II) chloride solution with its further hydrolysis in presence of concentrated ammonia, its placement into microwave oven (2450 MHz) with radiation power 539 W for 5-15 minutes, centrifugation of obtained tin (II) oxide and drying at temperature 90°C. hydrolysis is carried out in alkali medium, contributing to formation of ammonia colloidal solution of hydroxoform of tin (II) with further thermal destruction under microwave impact in absence of hydrothermal processing with the following ratio of components in the process of obtaining colloidal solution, wt %: metallic tin - from 1.5 to 1.8; 36% solution of hydrochloric acid - from 48.2 to 57.8; 25% ammonia solution - the remaining part.
EFFECT: elaboration of method of obtaining photocatalyst based on tin oxide with pore size to 18 nm and anisotropy coefficient equal 1, possessing high catalytic activity of decomposition of nitrogen-containing organic pollutants of sewage waters with minimal time consumption.
3 dwg, 3 ex
SUBSTANCE: invention relates to an ozone decomposition catalyst for aviation converters, made of corrugated aluminium foil with an aluminosilicate coating, which is impregnated with transition metal oxides with additives of noble metals or oxides thereof, wherein said aluminosilicate coating is formed via microplasma treatment of a substrate made of a valve metal.
EFFECT: achieving high degree of ozone decomposition at low temperatures and reduced usage of noble metals.
17 cl, 3 dwg, 2 tbl, 3 ex
SUBSTANCE: stage of nickel and molybdenum evaporation from combined solution, containing nickel nitrate and ammonium molybdate, is carried out, after which stage of thermochemical processing of sediment in hydrogen flow and its passivation are performed. Catalyst activation is performed by processing suspension of 10 wt % of nitride powder in ethanol by ultrasound with power to 1 kW.
EFFECT: method makes it possible to increase catalytic activity, selectivity and mechanical strength of obtained catalyst.
SUBSTANCE: method consists in electrolytic sedimentation of zinc on foam-nickel and thermal processing in inert medium at temperature from 650 to 750°C for not more than 2 h.
EFFECT: method makes it possible to simplify preparation of skeletal catalyst, reduce time of thermal processing and create foam-nickel with developed porous surface.
3 dwg, 2 ex
SUBSTANCE: invention relates to the field of nanotechnologies, namely to flame-arc technology of synthesis of nanostructural composite materials. The proposed method of synthesis of nanostructural composite CeO2-PdO material in plasma of electric discharge comprises evacuation of vacuum chamber, filling it with inert gas, ignition of the electric direct-current arc between the graphite electrode and the metal-carbon composite electrode which is a graphite rod with the cavity perforated in the centre, and spraying the composite electrode. At that in the plasma of electric arc discharge the metal-carbon composite electrode is sprayed, in which cavity drilled in the centre the rod of cerium is mounted, which is wrapped in palladium foil, and the weight ratio Pd/Ce is from 3 to 9%. Then, annealing of the synthesised material is performed, which comprises Ce2O3nanocrystals and a small amount of Pd nanocrystals with characteristic sizes of 2-5 nm, by heating it in the oxygen-containing environment with the atmospheric pressure to the temperature of 600, 700, 800, 900°C, with exposure for 2 hours and slow cooling.
EFFECT: method enables to obtain nanostructural composite material CeO2-PdO which can be used as a catalyst having high activity at low temperatures as well as improved thermal stability and resistance to corrosion in aggressive environments.
2 cl, 6 dwg
SUBSTANCE: invention relates to a method of obtaining nanowhisker structures of oxide tungsten bronzes on a coal material, in which electrolysis is carried out in a pulse potentiostatic mode with overvoltage of 300 mW in melt, which contains 30 mol. % K2WO4, 25 mol. % Li2WO4 and 45 mol. % WO3, with the application of a platinum anode, and electroprecipitation is carried out on a cathode from the coal material with the high specific surface, before supplying on the electrode of an overvoltage impulse the cathode is soaked with melt during the time, sufficient for soaking, but insufficient for active burning-out of carbon from the coal cathode.
EFFECT: application of the claimed method makes it possible to obtain nanowhisker structures of tungsten bronzes on the coal material, which can be applied as high-activity catalysts, possessing technological properties for processes of organic and petrochemical synthesis.
3 ex, 1 tbl, 6 dwg
SUBSTANCE: claimed is a method of preparing a heterogeneous phthalocyanine catalyst for oxidation of sulphur-containing compounds by an activation of non-woven lavsan by microwave radiation with a frequency of 2450 MHz, power 500-2000 W for 3-15 minutes, processing the activated material in a solution of cobalt tetra-4-[(4'-carboxy)phenylsulpfanyl]phthalocyanine with a concentration of 0.2-0.6 g/l for 2-4 hours and further stand of the material in a sodium hydroxide solution at pH 8.0-8.5 for 40-80 minutes.
EFFECT: increased catalytic activity of the target product and simplification of the method of its preparation.
SUBSTANCE: invention relates to catalysis. Described is a metal-loaded catalyst for converting organic compounds, which comprises a support and primary active metal components, and optionally auxiliary active metal components, where the primary active metal components are elementary substances obtained via ionising radiation reduction of precursors of the primary active metal components. Described is a method of preparing the described catalyst and use thereof in converting organic compounds.
EFFECT: high activity and selectivity.
15 cl, 3 dwg, 8 tbl, 23 ex
FIELD: process engineering.
SUBSTANCE: invention relates to activation of catalysts for diesel fuel hydrofining and can be used in oil processing and petrochemical industries. Activation of nickel-molybdenum-alumina catalysts comprises bringing the catalyst in contact with the solution of ferriphenyl siloxane in organic solvent at cavitation hydrodynamic processing in bubble-cavitation layer of inert gas inside cavitation flow reactor at oscillation intensity of 0.25-0.55 W/m2 and 15-45°C for 5-25 min. Then, catalyst is cured in organic solvent at a room temperature, solvent is stripped and catalyst if dried and heat-treated.
EFFECT: higher desulfurising activity.
2 cl, 4 ex, 7 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to catalysis. Proposed method comprises micro arc oxidation in aqueous solutions of electrolyte containing alkaline metal hydroxide and metasilicate, salts of transition metals Mn, Cr or mixes thereof.It differs from know processes in that said micro arc oxidation if performed in pulses anode-cathode mode with duration of anode bursts of 50 ms, that of cathode bursts of 40 ms, intervals there between of 16 mc, mean anode-to-cathode current ratios of 1.1:0.9, from aqueous solutions of electrolyte. Said solution contains three solutions including sodium tefaborate, sodium tungstate, sodium molybdate and sodium metavanadate at successive oxidation therein for 10 min.
EFFECT: better catalytic properties, rust and wear resistance, thermal resistance of oxide layers.
SUBSTANCE: catalyst is obtained by impregnation of glass fibre carrier (structured in form of material, woven from threads with 1 mm diameter) with film-generating solution, maturation of which is realised at temperature 20-22°C for 4-5 days, and its further step-by-step thermal processing - at 60°C for 30-40 minutes and at 700°C for 1 hour, with the following ratio of initial solution components, wt %: titanium tetra-n-butoxide from 4.09 to 4.13, tetraethoxysilane from 0 to 1.49, cobalt(II) chloride tetrahydrate from 2.15 to 3.41, hydrochloric acid 0.27, distilled water from 0.56 to 1.04, n-butyl alcohol - the remaining part.
EFFECT: increased level of purification.
1 tbl, 2 dwg, 3 ex