Shell of hollow cylindrical catalyst carrier substrate and catalytically active oxide mass applied on outer surface thereof

FIELD: chemistry.

SUBSTANCE: invention relates to a method of increasing selectivity when producing acrylic acid with using shell-type catalyst for partial gas-phase oxidation of acrolein to acrylic acid, consisting of a hollow cylindrical bearing substrate with length from 2 to 10 mm, external diameter of 4 to 10 mm and wall thickness from 1 to 4 mm, as well as applied on outer surface of carrying wafer shell of catalytically active oxide mass of general formula (I):

in which X1 denotes one or more elements from a group of alkali and alkali-earth metals, X2 denotes one or more elements from a group of silicon, aluminium, titanium and zirconium, and n is a stoichiometric factor of oxygen element, which is determined by stoichiometric coefficients different from oxygen elements, as well as their charge number in formula (I).

EFFECT: high selectivity.

10 cl, 2 dwg, 3 tbl, 12 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of using gas-phase partial oxidation on a heterogeneous catalyst of acrolein into acrylic acid and methacrolein into methacrylic acid on a fixed catalyst bed lying in a shell-and-tube reactor in reaction tubes of a vertical bundle of reaction tubes enclosed in the reactor shell, when both ends of each of the reaction tubes are open and each reaction tube, through its top end, tightly enters a through-hole which is tightly built into the top part of the reactor shell of an upper tube sheet, and through its bottom end, tightly enters a through hole which is tightly built into the bottom part of the reactor shell of a lower tube sheet, wherein the outer surface of the reaction tubes, the upper and lower tube sheets, as well as the reactor shell together bound the space which surrounds the reaction tubes, wherein each of the two tube sheets is closed by a reactor cover having at least one hole, when in order to put into operation, a starting gaseous reaction mixture containing ≥3 vol. % acrolein or methacrolein and also molecular oxygen is fed into the reaction tubes of the shell-and-tube reactor through at least one hole, denoted hereafter as E, in one of the two reactor covers, and the gaseous product mixture containing acrylic acid or methacrylic acid, which is formed as a result of gas-phase partial oxidation of acrolein or methacrolein into acrylic acid or methacrylic acid by passing through a fixed catalyst bed lying in the reaction tubes, is removed through at least one hole in the other reactor cover, wherein at least one liquid heat carrier is fed from the side of the shell to the reaction tubes of the shell-and-tube reactor, the movement of the liquid heat carrier being such that each of the surfaces of both tube shells facing each other is covered by the liquid heat carrier, and wherein at least one liquid heat carrier enters the space surrounding the reaction tubes with temperature Twin and comes out of said space with temperature Twout. At the moment of use, the starting gaseous reaction mixture containing ≥3 vol. % acrolein or methacrolein is fed through at least one hole in the reactor cover, wherein temperature Twin of at least one liquid carrier which is in contact with the tube sheet closed by the reactor cover having at least one hole E, denoted hereinafter as reactor sheet E, is not lower than 290°C; the starting gaseous reaction mixture coming through at least one hole E has temperature ≤285°C and temperature of the surface of the reactor sheet E facing the reactor cover having at least one hole E, denoted hereinafter as the surface of reactor sheet E, is ≤285°C.

EFFECT: improved method.

16 cl, 4 dwg, 6 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing at least one product from acrolein and acrylic acid via partial oxidation of propylene, where a) purified propane is converted at the first reaction step in the presence and/or absence of molecular oxygen, at least one dehydrogenation from a group comprising homogeneous dehydrogenation, heterogeneous catalytic dehydrogenation, homogeneous oxydehydrogenation and heterogeneous catalytic oxydehydrogenation, wherein a gaseous mixture 1 is obtained, which contains unconverted propane and the formed propylene, and b) optional separation from the total amount or partial amount of the gaseous mixture 1 of a partial amount of components other than propane and propylene contained therein, e.g., hydrogen, carbon monoxide, water vapour and/or optional conversion thereof to other compounds, e.g., water and carbon dioxide, and where a gaseous mixture 1' is obtained, which contains propane and propylene, and on at least one of the following reaction steps, c) the gaseous mixture 1 or gaseous mixture 1' or a mixture from the formed gaseous mixture 1' and the remaining gaseous mixture 1 as a component of a gaseous mixture 2 are subjected to heterogeneous catalytic gas-phase partial oxidation of propylene contained in gaseous mixture 1 and/or gaseous mixture 1', wherein a gaseous mixture 3 is obtained, which contains at least one product, d) on at least one separation step, the product is separated from gaseous mixture 3 and from the remaining residual gas, at least propane is returned to the first reaction step, where purified propane is obtained from crude propane which contains ≥90 wt % propane, ≤99 wt % propane and propylene, ≥100 ppm hydrocarbons, having 2 carbon atoms, and ≥100 ppm hydrocarbons, having 4 carbon atoms, under the condition that crude propane is fed into the fractionation column and purified propane is obtained higher than the feeding point under the condition that content of hydrocarbons having 2 carbon atoms, in wt %, in terms of the contained propane, in the purified propane is more than 100% of the corresponding content in crude propane and content of hydrocarbons having 4 carbon atoms, in wt %, in terms of content of propane, in the purified propane is at most 50% of the corresponding content in crude propane.

EFFECT: method enables to cut design expenses owing to no separation of C2-hydrocarbons during distillation.

48 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method for long-term heterogeneous catalytic partial gas-phase oxidation of an organic starting compound selected from propylene, isobutene, acrolein, methacrolein, propane or isobutane, to the desired organic compound, where the starting gaseous reaction mixture, containing the organic starting compound and molecular oxygen, is first passed through a freshly loaded sold catalyst layer which is filled with separation into two temperature zones A and B, lying in space one behind the other, temperature TA of which is such that the difference ΔTBA between temperature TB of zone B and temperature TA of zone A, which is calculated by taking the greater of the two values as the minuend, is greater than 0°C, such that the starting reaction mixture of gases successively flows through temperature zones A, B, first through A and then B, where temperature zone A extends until conversion of the organic starting compound UA = 15-85 mol %, and in temperature zone B conversion of the organic starting compound increases to a value UB ≥ 90 mol %, and as the operating life increases, temperature of zones A, B is changed in order to compensate for deterioration of quality of the solid catalyst layer, where as the duration of operation increases, temperature of that temperature zone which initially had a lower value, is raised, and the difference ΔTBA between temperature values of both zones is lowered, such that when calculating the difference, temperature of that zone which was initially the higher value, remains as the minuend.

EFFECT: compensating for the deterioration of quality of the solid catalyst layer with long operating life.

21 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method for heterogeneous catalytic gas-phase partial oxidation of at least one initial organic compound selected from propylene, isobutene, acrolein, methacrolein, propane or isobutane with molecular oxygen on a fixed catalyst bed freshly put into a reaction space, in which, for partial oxidation, a reaction gaseous mixture containing at least one initial organic compound and molecular oxygen is passed through the fixed catalyst bed, and reaction heat is removed via indirect heat exchange with a liquid heat carrier directed outside the reaction space, and as the quality of the fixed catalyst bed falls with operation time, not all, but part of the fixed catalyst bed is replaced with part of a replacement fixed catalyst bed in order to restore the quality of the fixed catalyst bed, where the specific volume activity of the replacement part of the fixed catalyst bed is lower than that of the replaced part of the fixed catalyst bed in its fresh state.

EFFECT: deterioration of the quality of the fixed catalyst bed with operation time is compensated for by replacing part of the fixed catalyst bed with a replacement part of the fixed catalyst bed, where the rate of deactivation of the catalyst is lowest in the disclosed method.

10 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: method involves: a) heterogeneously catalysed vapour-phase partial oxidation of a starting organic compound selected from propylene, propane, isobutylene, isobutane, acrolein or methacrolein with molecular oxygen in a parallel-functioning system of oxidation reactors containing catalysts, which results in formation of two gas streams respectively containing the desired compound and respectively formed in one of two systems of oxidation reactors, and b) subsequent extraction of the desired product from two streams of the obtained gas to form at least one stream of crude desired product according to which c) before extraction of two from two streams, the obtained gas is mixed with each other into a mixed stream. In case of change in selectivity of formation of the desired product and/or by-products during operation the entire amount or partial amount of catalyst is replaced in parallel with fresh catalyst not in all parallel-functioning systems of oxidation reactors in which end products contained in the mixed stream are formed.

EFFECT: improved method of obtaining acrolein, acrylic acid, methacrolein or methacrylic acid as the desired product.

2 cl, 4 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of conducting a continuous process of producing acrolein, acrylic acid or mixture thereof from propane in a stable operating mode, according to which: A) propane in a first reaction zone A undergoes heterogeneously catalysed dehydrogenation in the presence of molecular oxygen to obtain a gaseous mixture of products A containing propane and propylene, B) the gaseous mixture of products A, if needed, is fed into a first separation zone A in which a portion or more of components different from propane and propylene is separated therefrom and a gaseous mixture of products A' containing propane and propylene remaining after separation is obtained, C) the gaseous mixture of products A or gaseous mixture of products A' is fed into at least one oxidation reactor of the second reaction zone B, in which propylene contained therein undergoes partial selective heterogeneously catalysed gas-phase oxidation with molecular oxygen to obtain a gaseous mixture of products B, which contains acrolein, acrylic acid or mixture thereof as the desired product, unconverted propane, excess molecular oxygen and, if needed, unconverted propylene, D) in the second separation zone B, the desired product contained therein is separated from the gaseous mixture of products B, and at least a portion of the remaining gas containing propane, molecular oxygen and, if needed, unconverted propylene is returned to the reaction zone A as circulation gas 1 containing molecular oxygen, E) fresh propane is fed into at least one continuous flow process zone selected from a group comprising reaction zone A, separation zone A, reaction zone B and separation zone B, where the said fresh propane is fed at a rate characterised by a given stationary value when realising the process in a stable operating mode, and F) content of molecular oxygen in the gaseous mixture of products B is continuously determined and said value is compared with the desired stationary value needed to realise the process in stable operating mode, characterised by that if at a certain moment in time, content of molecular oxygen in the gaseous mixture of products B exceeds the given desired stationary value, fresh propane is fed into the process right away at feed rate higher than its stationary value, and if at a certain moment in time, content of molecular oxygen in the gaseous mixture of products B is lower than the corresponding given desired stationary value, fresh propane is fed into the process right away at feed rate lower than its stationary value.

EFFECT: used of present method reduces heat loss and prevents a drop in degree of dehydrogenation when producing acrolein, acrylic acid or mixture thereof from propane.

13 cl, 2 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: according to method A) an input stream of the reaction gaseous mixture A is fed into the input of the first reaction zone A, where the input stream is obtained by merging at least four different gaseous initial streams 1, 2, 3 and 4, where the gaseous initial streams 1 and 2 contain propane, gaseous initial stream 4 is molecular hydrogen and gaseous initial stream 3 is fresh propane, the input stream of the reaction gaseous mixture A is passed at least through one catalyst layer of the first reaction zone A on which, if needed, when feeding other gaseous streams, as a result of heterogeneous catalytic partial dehydrogenation of propane, a stream of products of gaseous mixture A forms, which contains propane and propylene, the stream of products of gaseous mixture A comes out of the first reaction zone A through the corresponding outlet, while splitting said stream into two partial streams 1 and 2 of products of the gaseous mixture A with identical composition, and the partial stream 1 of products of the gaseous mixture A is returned to the first reaction zone A as the gaseous initial stream 1, the partial stream 2 of products of the gaseous mixture A, if needed, is directed to the first separation zone A, in which a portion or more of components contained therein, which are different from propane and propylene, are separated, as a result of which a stream of products of gaseous mixture A' which contains propane and propylene, B) partial stream 2 of products of the gaseous mixture A or a stream of products of gaseous mixture A' is used in a second reaction zone B for supplying at least one oxidation reactor, in which propylene contained in the partial stream 2 of products of gaseous mixture A or in the stream of products of gaseous mixture A' undergoes selective heterogeneously catalysed partial gas-phase oxidation with molecular oxygen to obtain a stream of products of a gaseous mixture B, which contains acrolein, acrylic acid or mixture thereof as the desired product, unconverted propane and, if needed, unconverted propylene, as well as molecular oxygen, the stream of products of gaseous mixture B comes out of reaction zone B, the desired product contained in separation zone B is separated in said separation zone B and at least a portion of residual gas formed after separation and containing unconverted propane, molecular oxygen and, if needed, unconverted propylene, is returned to reaction zone A as gaseous initial stream 2. Gaseous initial streams 2, 3 and 4 as well as, if needed, additional gaseous initial streams different from the gaseous initial stream 1, are merged into a gaseous stream of the working mixture, after which, using this gaseous stream of the working mixture as the working stream, a jet pump is activated, said pump having a nozzle, a mixing section, a diffuser and a suction inlet. Movement of the working stream which is throttled through the nozzle, the mixing section and the diffuser to the input of the first reaction zone A, as well as the suction effect of the suction inlet takes place in the direction of outlet of the stream of products of gaseous mixture A from the first reaction zone A. The pressure drop created in the suction nozzle with splitting of the stream of products of the gaseous mixture A into two partial streams 1 and 2 results in suction of the partial stream 1 of products of the gaseous mixture A, its movement through the diffuser with simultaneous mixture with the working stream on the mixing section and inlet of the formed reaction stream of gaseous mixture A at its inlet point into the first reaction zone A, characterised by that a gaseous initial mixed stream is formed first by merging in random sequence gaseous initial streams 2 and 3, as well as, if needed, additional gaseous initial streams different from gaseous initial streams 1 and 4, and only after that the gaseous initial stream 4 is added to the formed gaseous initial mixed stream to obtain a gaseous mixed working stream.

EFFECT: used of present method reduces heat loss and prevents a drop in degree of dehydrogenation when producing acrolein, acrylic acid or mixture thereof from propane.

7 cl, 4 ex, 4 dwg

FIELD: chemistry.

SUBSTANCE: initial mixture 2 of the reaction gas which contains propylene and molecular oxygen, as well as molecular nitrogen and propane as inert gases - diluents, in which molar ratio of molecular oxygen to propylene O2:C3H6≥1, at high temperature is passed through a fixed catalyst bed, the active mass of which is at least one polymetallic oxide containing Mo, Fe and Bi, in which the initial mixture 2 of the reaction gas, per total volume, contains 7-9 vol. % propylene, 9.8-15.5 vol. % molecular oxygen, 10.5-15.5 vol. % propane and 40-60 vol. % molecular nitrogen, provided that the molar ratio V1 of propane contained in the initial mixture 2 of the reaction gas to propylene contained in the initial mixture 2 of the reaction gas is between 1.5 and 2.2, molar ratio V2 of molecular nitrogen contained in the initial mixture 2 of the reaction gas to molecular oxygen contained in the initial mixture 2 of the reaction gas is between 3.5 and 4.5, and molar ratio V3 of molecular oxygen contained in the initial mixture 2 of the reaction gas to propylene contained in the initial mixture 2 of the reaction gas is between 1.4 and 2.14.

EFFECT: improved method of lowering flash point temperature of a fixed catalyst bed during synthesis of acrolein or acrylic acid or mixture thereof through heterogeneously catalysed gas-phase partial oxidation of propene.

27 cl, 1 dwg, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of lowering the flash point temperature of a fixed catalyst bed during synthesis of acrylic acid through heterogeneously catalysed gas-phase partial oxidation of propylene, in which a) at the first reaction step, propane undergoes heterogeneously catalysed dehydrogenation to obtain a product gas mixture 1, b) a partial amount of components in the formed product mixture 1 which are different from propane and propylene are converted to other compounds if needed and if needed a partial amount of components of the product gas mixture 1 formed at the first reaction step which are different from propane and propylene are separated, wherein a product gas mixture 1', which contains propane and propylene, as well as compounds different from oxygen, propane and propylene, is obtained from the product gas mixture 1, and c) as a component of the initial reaction gas mixture 2 at the second reaction step, the product gas mixture 1 or 1' undergoes heterogeneously catalysed partial oxidation in the gas phase of propylene contained in the product gas mixture 1 or 1' to acrolein, where the product gas mixture 2 is obtained, and d) temperature of the product gas mixture leaving the second reaction step, if needed, is lowered through direct and/or indirect cooling and molecular oxygen and/or inert gas is added to the said mixture 2 if needed, and e) further, as an initial reaction gas mixture 3 at the third reaction step, acrolein contained in the initial reaction gas mixture 3 undergoes heterogeneously catalysed gas-phase partial oxidation to acrylic acid, where the product gas mixture 3 is obtained, and f) acrylic acid and at least unreacted propane and propylene contained in the product gas mixture 3 are separated from the product gas mixture 3 in a separation zone A an then returned to at least the first of three reaction steps, where i) the second reaction step is carried out until achieving propylene degree of conversion Up ≤99 mol % for one-time passage through the zone, and ii) the third reaction step is carried out until achieving acrolein degree of conversion UA ≥96 mol % for one-time passage through the zone. The method involves at least one separate selection for components different from propane and propylene, which contains propane and propylene in amount ≤5 vol %.

EFFECT: low temperature.

39 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing acrylic acid from propylene, involving a first step where propylene is oxidised to acrolein and a second step where acrolein is oxidised to acrylic acid, as well as a step for dehydrating glycerin to acrolein in the presence of a propylene-containing gas. The said step for dehydrating glycerin is carried out before catalytic oxidation of propylene to acrolein in the presence of the supplied propylene-containing gas, or after catalytic oxidation of propylene to acrolein in the presence of a gaseous mixture coming out after oxidation of propylene to acrolein.

EFFECT: method enables partial use of renewable material, while increasing output of acrylic acid.

8 cl, 5 dwg, 6 ex

Reforming catalyst // 2558150

FIELD: chemistry.

SUBSTANCE: invention relates to method of reforming with application of catalyst. Described is method of reforming hydrocarbons with water vapour, including contact of supplied gas in reactor of catalytic partial oxidation or installation for autothermal reforming. Reactor operates at temperature 800-1600°C and pressure of 20-100 bar. Egg shell type catalyst, consisting of active compound in form of alloy of nickel and one metal from iridium and ruthenium, on supporter, containing aluminium oxide, zirconium dioxide, magnesium oxide, titanium dioxide or their combinations. Catalyst has cylindrical shape and has one or several through holes, where distance from centre to external catalyst surface constitutes from 10 to 40 mm, catalyst height constitutes from 10 to 40 mm, with diameter of one or several through holes constituting from 3 to 30 mm. At least 90 wt % of iridium or ruthenium in catalyst are located in external envelope which has depth up to 10% of external catalyst surface or to 10% of periphery of one or several through holes of catalyst.

EFFECT: realisation of method of catalytic partial oxidation or autothermal reforming at reduced drop of pressure in catalyst layer without reduction of catalyst activity.

12 cl, 5 dwg, 2 tbl, 5 ex

FIELD: process engineering.

SUBSTANCE: invention relates to filter designed to remove solid particles and nitrogen oxides from exhaust gases. Filter comprises porous substrate with inlet and outlet surfaces and substrate pores of the first average size. Note here that said porous substrate is coated by material increasing the surface area. Said material includes molecular sieve promoted by transition metal wherein aforesaid coat represents a porous untreated coat on inlet and/or outlet surface. One of plies has pores of the second average size, smaller than the first one.

EFFECT: balanced backpressure, efficient filtration and catalytic activity.

17 cl, 7 dwg, 3 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: claimed invention provides process of production of methanol, dimethyl ether as main products and low-carbon olefin as byproduct from synthesis gas, in which said process contains stage of contact of synthesis-gas with catalyst. Catalyst contains amorphous alloy, consisting of first component A1 and second component, with second component representing one or several elements or their oxides, selected from group IA, IIIA, IVA, VA, IB, IIB, IVB, VB, VIB, VIIB, VIII and a series of lanthanides of periodic table of elements, and said second component is different from first component A1. Conditions for conversion have reaction temperature 200-270°C, reaction pressure 1-6 MPa, volume rate of synthesis-gas supply 1000-10000 ml/g·hour and molar ratio between H2 and CO in synthesis-gas from 1 to 3.

EFFECT: in accordance with said process synthesis-gas can be converted into methanol, dimethyl ether and low-carbon olefin with high degree of CO conversion, high selectivity of target product and high availability of carbon.

19 cl, 3 dwg, 3 tbl, 14 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in production of construction materials. Photocatalytic composite material practically free from titanium dioxide contains limestone in amount at least 0.05% by the weight of sodium and calcium titanate in crystalline phases CT2 and/or CT5, characterised by the following diffraction maximums: CT2: (002) d=4.959; (210-202) d=2.890; (013) d=2.762 and (310-122) d-2.138; CT5: (002) d=8.845; (023) d-4.217; (110) d=3.611 and (006) d=2.948. The empirical formula of calcium titanate in phase CT2 is CaTi2O5, and the empirical formula of calcium titanate in phase CT5 is CaTi5O11.

EFFECT: invention makes it possible to increase photocatalytic activity of composite materials without application of titanium dioxide.

18 cl, 8 dwg, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to field of catalyst. Described is method of obtaining silver crystals with distribution of average size of particles from 0.15 mm to 2.5 mm and porous coating of oxide materials in which a) silver crystals contact with sol-gel solution of said materials, in solvent, which contains organic solvent and b) obtained as a result silver crystals are collected, c) released from organic solvent and d) then subjected to thermal processing at temperature between 50°C and point of silver melting. Described is application of obtained crystals as catalyst for obtaining formaldehyde.

EFFECT: increased activity of catalyst for obtaining formaldehyde.

10 cl, 3 dwg, 4 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to field of catalysis. Described is method of obtaining granular catalyst of cracking, which consists in mixing zeolite Y, loam and binding agent with the following formation, drying and burning, in which zeolite is mixed in crystallised phase form or in composition of mixture with amorphous silica-alumina and/or loam, binding agent, loam, and exhaust additive in weight ratio (25-40):(5-10):(40-50):(10-20), with aluminium oxychloride being applied as binding agent, mixture is formed by extrusion.

EFFECT: increase of catalyst strength.

6 cl, 1 tbl, 13 ex

FIELD: process engineering.

SUBSTANCE: invention relates to reduction of toxicity of automotive diesel exhaust gases containing nitrogen oxides and hydrocarbons by adding ammonium or compounds decomposing thereto to offgas flow to be forced above two selective reduction catalysts (SRC). First SRC catalyst arranged at inlet side catalyses efficiently the co-proportioning of nitrogen oxides by ammonium at 300-500°C and contains tungsten oxide WO3 and homogeneous mixed cerium and zirconium oxides (Ce, Zr)O2. Note here that hydrocarbons contained in exhaust gas are partially oxidised. Second SRC catalyst arranged at outlet side contains copper-substituted zeolite compound and catalyses efficiently the co-proportioning of nitrogen oxides by ammonium at 150-400°C and, at a time, accumulates excess ammonium.

EFFECT: good initial working characteristics at lower temperatures, higher efficiency nitrogen oxide conversion in wide temperature range.

17 cl, 4 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: described is a method of making catalytically active geometric moulded articles K, which contain as active mass, a multi-element oxide I with general stoichiometric formula (I): [BinZ1bOx]p[BicMo12FedZ2eZ3fZ4gZ5hZ6iOy]1 (I), according to which Z1 denotes tungsten or tungsten and molybdenum, under the condition that the amount of tungsten is at least 10 mol % of the total molar amount Z1, Z2 denotes an element or multiple elements selected from a group which includes nickel and cobalt, Z3 denotes an element or multiple elements selected from a group which includes alkali metals, alkali-earth metals and gallium, Z4 denotes an element or multiple elements selected from a group which includes zinc, phosphorus, arsenic, boron, antimony, tin, cerium, vanadium and chromium, Z5 denotes an element or multiple elements selected from a group which includes silicon, aluminium, titanium, tungsten and zirconium, Z6 denotes an element or multiple elements selected from a group which includes copper, silver, gold, yttrium, lanthanum and lanthanides, a is a number from 0.1 to 3, b is a number from 0.1 to 10, d is a number from 0.01 to 5, e is a number from 1 to 10, f is a number from 0.01 to 2, g is a number from 0 to 5, h is a number from 0 to 10, i is a number from 0 to 1, p is a number from 0.05 to 6, and x, y are respectively numbers defined by valence and number of atoms other than oxygen atoms in formula (1), wherein a fine mixed oxide BiaZ'bOx is formed in form of a starting mass A1, the particle diameter d50A1 of which satisfies the condition 1mcmd50A1100mcm, using sources, other than oxygen, of elements of the component part T of the multi-element oxide I, represented by [BicMo12FedZ2cZ3fZ4gZ5hZ6iOy]i, a homogeneous aqueous mixture M is formed in an aqueous medium, wherein: each of the sources used when forming the aqueous mixture M passes through a dispersion degree Q, characterised by that the particle diameter corresponds to d90Q5mcm, and the aqueous mixture M contains bismuth, molybdenum, iron, Z2, Z3, Z4, Z3 and Z6 in the stoichiometric formula (I*): BicMo12FedZ2cZ3fZ4gZ5hZ6i (I*); from the aqueous mixture M, by drying and controlling the dispersion degree d90A2, a fine starting mass A2 is formed, the particle diameter d90A2 of which satisfies the condition400mcmd90A210mcm; the starting mass A1 is mixed with starting mass A2 or the starting mass A1, starting mass A2 and a fine auxiliary moulding agent are mixed to obtain a fine starting mass A3, which contains elements of the multi-element oxide I other than oxygen that are introduced therein through starting mass A1 and A2, in stoichiometric formula (1**): [BiaZ'b]p[BicMo12FedZ2eZ3fZ4gZ5hZ6i]l (I**);geometric moulded articles V are formed from the fine starting mass A3; the moulded articles V undergo heat treatment at high temperature to obtain catalytically active geometric moulded articles K, wherein the stoichiometric coefficient "c" lies in the range 0<c≤0.8.

EFFECT: described is a method for heterogeneously catalysed partial gas-phase oxidation of an alkane, alkanol, alkanal, alkene and/or alkenal containing 3-6 carbon atoms in a catalyst bed, wherein the catalyst bed contains catalytically active moulded articles which can be made using said method.

15 cl, 3 tbl, 13 ex

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing catalytic moulded articles and use thereof. Described is a method of making catalytically active geometric moulded articles K, which contain as active mass, a multi-element oxide I with general stoichiometric formula (I): [BilWbOx]a[Mo12Z1cZ2dFeeZ3fZ4gZ5hOy]l (I), in which Z1 denotes an element or multiple elements selected from a group which includes nickel and cobalt, Z2 denotes an element or multiple elements selected from a group which includes alkali metals, alkali-earth metals and thallium, Z3 denotes an element or multiple elements selected from a group which includes zinc, phosphorus, arsenic, boron, antimony, tin, cerium, vanadium, chromium and bismuth, Z denotes an element or multiple elements selected from a group which includes silicon, aluminium, titanium, tungsten and zirconium, Z5 denotes an element or multiple elements selected from a group which includes copper, silver, gold, yttrium, lanthanum and lanthanides, a is a number from 0.1 to 3, b is a number from 0.1 to 10, c is a number from 1 to 10, d is a number from 0.01 to 2, e is a number from 0.01 to 5, f is a number from 0 to 5, g is a number from 0 to 10, h is a number from 0 to 1, and x, y are respectively defined by valence and number of atoms other than oxygen in formula (I), wherein a fine mixed oxide BilWbOx is formed in form of a starting mass A1, the particle diameter d50A1 of which satisfies the condition 1 mcm ≤ d50A1 ≤10 mcm; a homogeneous aqueous mixture M is formed in an aqueous medium using sources, other than oxygen, of elements of the component part T=[Mo12ZlcZ2dFeeZ3fZ4gZ5hOy]l of the multi-element oxide I, wherein: each of the sources used when forming the aqueous mixture M passes through a dispersion degree Q, which corresponds to particle diameter d90Q ≤ 5 mcm, and the aqueous mixture M contains molybdenum, Z1, Z2, iron, Z3, Z4 and Z5 in the stoichiometric formula (I*): Mo12ZlcZ2dFecZ3fZ49Z5h (I*); from the aqueous mixture M, by drying and controlling the dispersion degree, a fine starting mass A2 is formed, the particle diameter d90A2 of which satisfies the condition 200 mcm ≥ d90A2 ≥ 20 mcm; the starting mass A1 is mixed with starting mass A2 or the starting mass A1, starting mass A2 and a fine auxiliary moulding agent are mixed to obtain a fine starting mass A3, which contains elements of the multi-element oxide I other than oxygen that are introduced therein through starting mass A1 and A2, in stoichiometric formula (1**): [BilWb]a[Mo12ZlcZ2dFeeZ3fZ4gZ5h]i (I**); geometric moulded articles V are formed from the fine starting mass A3, and the moulded articles V undergo heat treatment at high temperature to obtain catalytically active geometric moulded articles K, wherein the product F:(d50A1)0,7(d90A2)1,5(a1) is ≥820.

EFFECT: described is a method for heterogeneously catalysed partial gas-phase oxidation of an alkane, alkanol, alkanal, alkene and/or alkenal containing 3-6 carbon atoms in a catalyst bed, wherein the catalyst bed contains catalytically active moulded articles made using said method.

15 cl, 8 dwg, 10 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: isoprene is obtained by liquid-phase interaction of formaldehyde and isobutylene and/or substances, which represent their sources, for instance 4,4-dimethyldioxane-1,3 and trimethyl carbinol, at higher temperature and pressure in presence of water solution of inorganic acid and metal cations as catalyst, with distillation of reaction products and water from reaction zone and further isoprene separation, with carrying out isoprene synthesis in presence of catalyst, which includes mixture of either ortho- and pyrophosphoric acids, or ortho- and poly-phosphoric acids, or ortho- and metaphosphoric acids and cations of metals of VI, VIII and X group of Mendeleev′s Periodic table of elements, content of which constitutes 0.5-6.0 g/l.

EFFECT: method makes it possible to realise process with higher productivity.

3 cl, 1 tbl, 9 ex

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