The honeycomb body, in particular a catalyst carrier

 

(57) Abstract:

The invention relates to a honeycomb body, in particular to the carrier of the catalyst, of at least partially structured sheet, which form the walls of a large number of channels for the flow medium. At least part of the sheet 1 has a main wave with crests of waves 2 and hollows between 3 and pre-set the wave height H and wave crests (2) and/or hollows (3) is equipped with a large number of special items 4,5, height h,h which is less than or equal to the wave height H, but is preferably a value between a third and two thirds the height of the waves. Educated particular elements of 4.5 additional channels for flow of the medium inside the honeycomb body can significantly improve the activity at the same cost of materials by reducing the effects of boundary layer environment. Simultaneously reduces the area of surface contact with the adjacent layers of leaves, making optimum use of the applied material for catalytically active surfaces. 15 C.p. f-crystals, 4 Il.

The invention relates to a honeycomb body, in particular to the case of the catalyst for hire, made for medium channels. Such carriers of catalysts known in many variants and are described, for example, in patents from the European patent office N a-02 20 468, N a-02 79 159, N a-02 45 737 or a-02 45 736.

It is known that in many cases of application, as well as traditional sizes such honeycomb bodies flow in the channels is mainly laminar, because they use the channels that have very small cross-section. In such conditions at the walls of the channels are formed relatively thick boundary layers of flow, which reduce contact with the core flow in channels with walls. Diffusion processes between the core flow and boundary layers, although this is partially offset, however, attempts have been made to make improvements by special structuring of the honeycomb body.

From the Federal Republic of Germany patent No. 11 92 624 known, for example, the manufacture of the honeycomb body from a large number of consecutive disks, channels are shifted in the direction of flow of one relative to another. Such a case is in the inner part constantly new sleek edges, on which there is a separation of the flow. Thus one behind the other predominantly disks of spiral wound smooth or Ohm respect due to the necessity of producing large number of small disks, and secondly, this technique leads to uneven location displaced one relative to the other channels, which affects the coating and subsequent operation of the channel.

In patents from the European patent office N A-01 52 560 and N-01 86 801 describes a possible implementation of the same ideas that are more favorable with respect to technical performance, because of the honeycomb body should not be collected from multiple disks. However, the described wavy shapes lead to the fact that a significant portion of the surface of the used sheets superimposed one on another, resulting in an undesirable reduction used for catalytic contact surface in relation to the amount of material used.

In summarizing the article M. Nonnenmann: "Neue Metalltrager fur Abgaskatalisatoren mit erhohter Aktivitat und innerem Stromung Sausgleich", ATZ Automolltechnische Zeitschrift 91 (1989) 4, S. 195-192, which describes the benefits and the action shifted relative to each other in the direction of flow channels, an alternative was also proposed, according to which instead of layers of smooth sheets apply the so-called mikrovoloknistoy tape, which provides a somewhat more favorable use of the surface. This microwave is x tapes tiny channels which narrowed during the subsequent coating process and the result is a significant increase in loss of pressure and resulting in loss of active area and an unnecessary consumption of the mass of the coating. However, the article suggests that, based on the technical capabilities of the metal catalyst carrier is more advantageous in comparison with extruded ceramic case-bearer, because due to the constructive techniques can provide internal impact on the hydraulic conditions of flow. This may cause an additional effect, namely the transverse mixing of the flow in separate channels through the respective connecting paths or openings in the walls of the channels.

The present invention is the creation of a honeycomb body, in which you can take advantage shifted relative to each other the inner wall and in which at each other imposed only a small part of the surfaces of the individual layers. This should be taken into account technological feasibility of producing such porous bodies, so that it was not expensive.

This is achieved by creating such a mesh is and channels, through which flows the medium and part of the leaves has a main wave with the peaks of the waves and the troughs between them and a given wave height. When this wave crests and/or troughs of the waves supplied with plenty of special elements, the height of which is less than or equal to the height of the waves, mostly between one third and two thirds the height of the waves. This wavy body is particularly suitable for use as housing-catalyst carrier, used mainly for cars with internal combustion engines. Special elements create in the inner part of the honeycomb body additional channels for the incident medium and form together with the basic wave structure, which reduces the formation of boundary layers in the flow environment. This case has an equal flow of materials higher catalytic activity compared with the corresponding mesh body that does not contain such specific items. At the location of the structured sheet layers is reduced and the contact surfaces between the individual layers due to the special items.

Taking into account the conditions of flow in such a honeycomb body, specific items should have the approximate tlie layers. It is advisable, in addition, be positioned at each wave crest and/or each hollow waves sequentially in the direction of the flow of two or more special elements to create all new additional channels for notcause environment. The distance between two consecutive special items on the wave crest or trough of the wave must be in the same order of magnitude as the length of the special elements, therefore, from about 4 to 20 mm, but mostly from 8 to 16 mm

Depending on the depth of the particular elements of the latter can be directly next to each other as the wave crest and trough of a wave, but for reasons of stability favorable to place specific items on the crests of the waves against those special elements which are offset by depressions, which may be approximately 30 mm and to be predominantly greater than the length of specific items.

To increase the number of streamline edges of the honeycomb body, which do not coincide with each other in a straight line on each crest of a wave and/or in each trough of the waves can be located in two or more particular element at different heights. When equal to the cost of the giving of the honeycomb body, as though it has a much larger number of channels than the number of wave crests and troughs main waviness.

To form the main waviness, and form a particular element, it does not matter, since the waviness contains not too flat wave crests and troughs, which may form a large contact surface with the adjacent layers. Favorable form the main waviness is zigzag corrugation with a slightly rounded wave crests and troughs, which are geometrically very descriptive ratio of a particular element, and formed the shape of channels.

Favorable in terms of technology and from the point of view of high elasticity is the main waviness, which corresponds to the scan involute gearing, as it is known from the above prior art. Special items can be, for example, V-shaped or U-shaped with rounded edges, or transitions to the main waviness. In addition, it is also possible to form specific elements, corresponding approximately to the shape of the teeth of involute gearing.

Special items can also come in the particular implementation of the invention to provide the th can be achieved, for example, the height of each protrusion at its both end sides or slight inclined position relative to the centerline of the channel. This form of execution of the invention is favorable if necessary in connection with the possible channels in the intermediate layers.

For the temperature distribution in the honeycomb body may be expedient special items not distribute evenly, and with the increase in the number of special elements per unit volume in the direction of flow. This creates a similar effect as in the case of the construction of the honeycomb body of the disks with the increasing number of channels in the flow direction of the surface cross-section.

According to the invention, the honeycomb body can be made of alternating layers of smooth or slightly structured and corrugated sheets with special elements, while the body may be wound to have a floor or winding. Corrugated according to the invention the sheets with special items, you can perform almost all the known methods that can be used for simple corrugation sheets. For example, you can create a body from a pile of sheets having in the opposite direction of the loop end is tov be understood with a layer of corrugated sheets with small in comparison with the main waviness amplitude and/or the layer of leaves, structured across the flow with a small amplitude, which, in contrast to the main waviness, basically does not specify, however, the magnitude of the resulting channels in the honeycomb body.

With the aim of creating favourable conditions for additional cross-mixing of the flow in the porous body, it is possible to provide openings in smooth or weakly structured layers of leaves. This further narrows almost linear plane of contact between the smooth and corrugated layers of sheets, providing a particularly beneficial use of the applied material for catalytically active surfaces.

All related to metal honeycomb bodies known additional measures to improve elasticity, stability, activity and possible ease of production can mainly be ported to the present invention. For example, it is possible, in particular, the contacting surfaces of the layers of the sheets to be connected together, at least in partial areas by soldering or connecting layers sheet with the surrounding porous body tube-shell expansion technique.

The subject of the present invention is illustrated below by examples of its implementation and wavy sheet in perspective; in Fig. 2 - cut layer sheets provided by the subject invention a special cellular elements of the body, front view; Fig. 3 - layer honeycomb body according to the invention with two different height special items, view from the mechanical side of Fig. 4 is a section through a portion of the layer of the honeycomb body according to the invention with another form of the basic folds and the main elements.

In Fig. 1 you can see a small part of a structured sheet 1 fitted with special elements 4 on the crests of waves 2 and special elements 5 on the troughs of the waves 3. Thus from the structured sheets, mainly in connection with smooth leaves as intermediate layers, there is an intensive way to produce a honeycomb body according to the invention by layering, winding or looping of the stack of sheets. Special items 4, 5 form additional channels for crowding environment 6 inside this porous body, resulting in a significant increase in the effectiveness of their work does not require the additional cost of materials. Special items 4 or 5 have a height h or h', and here, in contrast to the wave height H does not require compliance with the height special items 4, 5, so that otdelnite is approximately 2 to 5 mm Height h, h' special items 4, 5 must be at least slightly smaller than the wave height H, so that special items are not acted beyond the crests of waves 2 or troughs between waves 3 and did not impede the laying-up or coiling.

Should not occur between specific elements and adjacent layers of any of the bridges of the applied coating. The length of a particular element can be a value between 4 and 20 mm, but mostly from about 8 to 16 mm, a Few special items 4, 5 on the crest of a wave 2 or at the trough between waves 3 should be placed one after another at the same distance, i.e. the distance b is equal to from 4 to 20 mm, but mostly from 8 to 16 mm for reasons of stability it is preferable to special items 4 crests of waves 2 are not located directly about specific items 5 troughs between waves 3, although it is possible. From the constructive point of view, it is advisable to offset c in the direction of flow up to 30 mm Offset c preferably should be, anyway, a few millimeters longer than the length of a particular elements.

In Fig. 2 shows in the form on the mechanical side part of the layer of the honeycomb body according to the invention in the different sheets 7, contains basic waviness height H on the crests of waves 2 and the troughs between waves 3. Special items 4, 5 create additional channels for crowding environment 6 inside of the honeycomb body. Height h, h' special elements 4, 5 in Fig. 2 is smaller than the wave height H and thanks to the respectively adjacent smooth or slightly structured layers of sheet 7, the distance d or d'. This distance d, d' such size that when the later coated cellular ceramic body weight could not form undesirable subsequently broken material bridges. Channels for crowding environment 6 form a structure like a honeycomb body has almost three times more flow channels than the corrugated sheet on the crests of waves 2 and in the troughs between waves 3. Accordingly becomes high activity in catalytic conversion, with no need for the consumption of large quantities of material.

In Fig. 3 shows the layer of the honeycomb body according to the invention, with two different height special elements 4, 4' or 5, 5'. Are formed are not on one straight line channels to crowding of the environment that give the honeycomb body higher efficiency compared to effektiver> In Fig. 4 you can see the other possible forms of execution waviness and special items shown in the cross section through the layers of the honeycomb body according to the invention. Corrugated sheet 8 placed between two smooth or slightly structured layers 7 has approximately the shape of the deployed involute gearing. Also special elements 9, 10 are in the form of teeth, involute gearing with rounded transitions to the main waviness. The crests of the waves 11 and troughs between waves 3 can, if necessary, to bind with adjacent smooth layers of sheets 7. Smooth layers of sheets 7 may contain additional openings 12, promoting better mixing in the transverse direction flowing in the honeycomb body environment between the individual layers and channels.

For the manufacturing of corrugated on the subject of the invention and provided with special items sheet according to Fig. 1 can smooth strip of the first sheet to pass through a pair of corrugated rolls with the main wave, and then rolled through a couple of other wavy rolls to obtain a small waviness 13, as shown by hatching in Fig. 1, which handle only part of the width of the sheet. There are also other ways inasia operations in the manufacture of the honeycomb body does not differ from business operations, related to the implementation of simple corrugated sheets that perform according to the prior art.

The honeycomb body according to the invention is suitable due to its low weight, small material consumption and high activity, in particular, as a catalyst carrier for cars with internal combustion engines,

1. The HONEYCOMB BODY, IN PARTICULAR a CATALYST CARRIER of the at least partially structured sheet 1, 10, forming a large number of channels 8 for the transmission medium, characterized in that the portion of the sheet 1 contains the basic waves with crests of waves 2 and troughs between waves 3 and a predetermined height H waves, with crests of waves 2 and/or hollows 3 is equipped with a large number of special items 4,5; 4', 5'; 44, 45, which height h, h1less than or equal to the height H of the wave, but mostly equal to the value between 1/3 and 2/3 of the height of the waves.

2. The body under item 1, characterized in that the length of a particular element 4, 5; 4', 5', 44, 45 in the direction of flow is equal to 4 to 20 mm, but mostly 8 - 16 mm

3. The body under item 1 or 2, characterized in that on each crest of the wave 2 and/or each trough between waves 3 are contained in the flow direction one behind the other, two or more mi one after the other special items 4, 4'; 44 or 5, 5'; 45 on the crest of a wave 2 or in a trough between waves 3 is 4 to 20 mm, but mostly 8 - 16 mm

5. The body under item 1, 2, 3 or 4, characterized in that the specific elements 4; 4'; 44 crests of waves 2 offset special elements 5; 5'; 45 on the offset value c relative to each other in the flow direction, which is between 0 and 30 mm, but mostly greater than the length of a particular element 4; 4'; 44.

6. The body on one of the PP. 1 to 5, characterized in that two or more special elements 4, 4', 5, 5' of different heights h, h' are provided on each crest of the wave 2 and/or each trough between waves 3.

7. The body on one of the PP. 1 - 6, characterized in that the main waviness approximately zigzag with a slightly rounded crests of waves 2 and troughs between waves 3.

8. The body on one of the PP. 1 to 3, characterized in that the corrugation corresponds to the scan involute gearing.

9. The body on one of the PP. 1 to 8, characterized in that the specific items 4, 5; 4', 5'; 44,45 have approximately V-shaped or V-shaped with rounded edges, or transitions to the main waviness.

10. The body on one of the PP. 1 to 8, characterized in that the specific items 4, 5; 4', 5'; 44, 45 �Eesa fact, what specific items 4, 5; 4', 5'; 44, 45 have at their ends a different height h or h', so that the plane of the walls of the special elements are at an acute angle to the given direction of the channels through the main undulation.

12. The body on one of the PP. 1 - 11, characterized in that the number of special items 4, 5; 4', 5'; 44, 45 per unit volume of the honeycomb body in the direction of the formed main sinuosity of channels increases from one end side to the other.

13. The body on one of the PP. 1 - 12, characterized in that the porous body of alternating layers of smooth or weakly structured 10 and corrugated sheets 1 twisted, covered with a layer or loops special items 4, 5; 4', 5'; 44, 45.

14. The body on p. 13, characterized in that a smooth or slightly structured sheets contain 10 holes 11.

15. The body under item 13 or 14, characterized in that the crests of waves 2 and hollows 3 form only a narrow plane of contact between with smooth layers of sheets 10.

16. The body under item 15, wherein the plane of contact between the layers of sheets 1, 10 brazed to one another at least in partial areas.

 

Same patents:

The invention relates to a mobile element, in particular to the supporting element of the catalyst, which consists of at least partially structured sheet and has many channels permeable to liquid, and the method of its manufacture

The invention relates to the production of media used for preparation of bulk catalysts, in particular of catalysers of organic and inorganic compounds present in gaseous emissions from technological processes or in the exhaust gases of internal combustion engines

FIELD: gas treatment catalysts.

SUBSTANCE: invention, in particular, relates to internal combustion engine exhaust gas neutralizers. Method of invention comprises rolling refractory metallic tape into block by way of overlapping its smooth and corrugated sides to form channels, performing ultrasound-assisted chemical cleaning of thus rolled tape in alkali solution followed by joining alternate layers of metallic tape with each other by diffusion welding in vacuo within a range of 5·10-5-1·10-5 mm Hg using stepwise heating to 1250 ± 10°С and isothermal exposure to this temperature for 12-17 min to form monolithic structure consisting of triangular and trapezoidal channel at density up to 600 channels per 1 inch2. Invention further describes carrier for catalytic exhaust gas neutralizers representing monolithic metallic structure in the form of cylindrical block or block with oval cross-section, which block consists of parallel channels, 200-600 per 1 inch2, density of channels varying along the cross-section of carrier: from center and extending to 0.55 0,7 diameter if cylindrical block or large axis of oval cross-section, density of channels is 400-600 per 1 inch2 and farther it decreases to 200 or 400 channel/inch2, respectively.

EFFECT: simplified manufacture technology and increased strength of monolithic cellular structure.

4 cl, 4 dwg, 1 tbl

Catalyst carrier // 2254921

FIELD: catalyst manufacture technology.

SUBSTANCE: invention relates to catalyst carriers used in various heterogeneous catalyst applications and as accumulator cells, galvanic and fuel cells, In particular, utilization of geyserite as catalyst carrier is described.

EFFECT: increased temperature and chemical stability of carrier.

FIELD: inorganic compounds technologies.

SUBSTANCE: invention provides porous composite particles containing alumina component and residue of at least one additional crystal growth inhibitor component dispersed within alumina component, wherein indicated composite particles have (A) specific surface area at least 80 m2/g; (B) average nitrogen-filled pore diameter 60 to 1000 Å; (C) total nitrogen-filled pore volume 0.2 to2.5 cm3/g and (D) average particle size 1 to 15 μm, and where, in indicated composite particles, (i) alumina component contains at least 70 wt % of crystalline boehmite with average crystallite size 20 to 200 Å, γ-alumina obtained from indicated crystalline boehmite, or mixture thereof; (ii) residue of additional is obtained from at least one ionic compound containing ammonium, alkali metal, alkali-earth metal cation, or mixtures thereof and wherein anion is selected from group comprising hydroxyl, silicate, phosphate, sulfate, or mixtures thereof and is present in composite particles in amounts between 0.5 and 10 % of the summary weight of alumina and additional components. Invention also provides a method to obtain composite particles, agglomerated particles prepared therefrom, and a method for hydroprocessing of petroleum feed using above-mentioned agglomerates.

EFFECT: avoided unnecessary calcination before addition of metals to increase average pore size and use of organic solvents for azeotropic removal of water.

36 cl, 2 tbl, 22 ex

FIELD: composite materials.

SUBSTANCE: invention relates to catalyst carriers and methods for preparation thereof. Novel porous composite material particles are proposed comprising alumina component and swelled clay component finely dispersed in alumina component in amount effective to raise hydrothermal stability, pore volume, and/or pore mode in the mesopore region in composite material particles as compared to swelled clay-free material. Also proposed are composite material particles and agglomerate particles obtained therefrom as well as a method for hydroprocessing of petroleum feedstock using agglomerates as hydroprocessing catalyst carrier.

EFFECT: increased hydrothermal stability and pore volume.

44 cl, 24 dwg, 19 tbl, 28 ex

FIELD: production of carbon carrier for catalysts.

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EFFECT: enhanced economical efficiency; increased productivity of process.

3 ex

FIELD: technology for silicium dioxide production useful as additive for polymer reinforcement.

SUBSTANCE: claimed method includes silicate reaction with acidifying agent to produce silicium dioxide slurry separation and drying of said slurry, wherein reaction is carried out according to the next steps: i) providing base aqueous solution with pH from 2 to 5, preferably from 2.5 to 5; ii) simultaneous addition silicate and acidifying agent to said base solution maintaining solution pH from 2 to 5, preferably from 2.5 to 5; iii) addition silicate only without acidifying agent to produce pH from 7 to 10, preferably from 7.5 to 9.5; (iv) simultaneous addition silicate and acidifying agent to reaction medium to maintain pH from 7 to 10, preferably from 7.5 to 9.5; (v) addition acidifying agent only without silicate to produce reaction medium pH below 6. Obtained high structured silicium dioxides have the next characteristics: CTAB specific surface (SCTAB) is 40-525 m2/g; BET specific surface (SBET) is 45-550 m2/g; width Ld ((d84-d16)/d50) of particle size distribution measured by XDC grading analysis after ultrasound grinding is at least 0.92; and such pore distribution that V(d95-d50)/V(d5-d100) is at least 0.66.

EFFECT: improved material for polymer reinforcement.

FIELD: chemical industry; methods of production of zirconium oxides

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the methods of obtaining of zirconium oxide for production of the catalytic agents used, for example, in the reactions of the organic synthesis. The invention presents the method of obtaining of zirconium oxide for production of the catalytic agents, which includes the operations of dissolution of the zirconium salt in water, treatment of the solution with the alkaline reactant, settling of the metals hydroxides, filtration, separation of the mother-liquor from the settlings, the settlings water flushing, its drying, calcination and granulation and-or granulation by molding. At that dissolution of the source zirconium chloride and-or zirconium oxychloride is conducted in the sodium chloride solution with concentration of 200-250 g/dc3 till reaching of the concentration of zirconium of 20-120 g/dc3. Settling of zirconium oxyhydrate is conducted by the adding the initial chloride solution in the solution of the sodium hydroxide with concentration of 20-80 g/dm3 up to reaching the suspension pH equilibrium value - 5-8. Then the suspension is filtered up to the zirconium oxyhydrate pasta residual humidity of 40-80 %. The mother chloride solution is separated from the settlings of zirconium oxyhydrate and again use it for dissolution of the next batch of zirconium chloride and-or zirconium oxychloride. The settlings of zirconium oxyhydrate are subjected to drying at 80-100°C within 2-6 hours, then the dry settlings are suspended in the water at the ratio of liquid to solid L:S = (5-10 :1, the suspension is filtered, the sediment on the filter is flushed by water, the chlorides are wash off up to the residual concentration of ions of chlorine in the flush waters of 0.1-0.5 g/dm3, divided into 2 parts, one of which in amount of 60-80 % is subjected to drying and calcinations at the temperatures of 300-600°C, and other part in amount of 20-40 % is mixed with the calcined part of the settlings and subjected to granulation by extrusion at simultaneous heating and dehydration of the damp mixture of zirconium oxide and zirconium oxyhydrate with production of the target product. The technical result of the invention is improvement of quality of the produced zirconium oxide for production of the catalytic agents due to provision of the opportunity to use ZrO2 for the subsequent production of the various catalytic agents of the wide range of application and thereby improving the consumer properties of the produced production.

EFFECT: the invention ensures improvement of the quality of the produced zirconium oxide for production of the catalytic agents with improved consumer properties.

1 ex

FIELD: technical chemistry; catalyst carriers for various heterogeneous processes in chemical industry.

SUBSTANCE: proposed carrier has metal base made from chromium and aluminum alloy and/or metallic chromium and coat made from chromium of aluminum oxides or oxides of chromium, aluminum, rare-earth elements or mixture of them. Method of preparation of carrier includes forming of metal powder containing aluminum and other powder-like components and calcination of carrier at solid phase sintering point; used as additional component of metal powder is powder-like chromium; mixture thus obtained is subjected to mechanical activation and is placed in mold accessible for water vapor, after which it is subjected to hydro-thermal treatment and molded product is withdrawn from mold, dried and calcined at respective temperature; then additional layer of aluminum and rare-earth elements oxides or mixture of solutions and suspensions is applied on calcined product followed by drying and calcination.

EFFECT: increased specific surface; enhanced heat resistance of carrier.

8 cl, 1 tbl, 5 ex

FIELD: organic synthesis catalysts.

SUBSTANCE: invention relates to creating carriers for catalysts used in epoxidation of olefins and provides catalyst containing at least 95% α-alumina with surface area 1.0 to 2.6 m2/g and water absorption 35 to 55%, and which has pores distributed such that at least 70% pore volume is constituted by pores 0.2 to 10 μm in diameter, wherein pores with diameters 0.2 to 10 μm form volume constituting at least 0.27 ml/g of carrier. Also described is a method for preparing catalyst carrier, which envisages formation of mixture containing 50-90% of first α-alumina powder with average particle size (d50) between 10 and 90 μm; 10-50% (of the total weight of α-alumina) of second α-alumina powder with average particle size (d50) between 2 and 6 μm; 2-5% aluminum hydroxide; 0.2-0.8% amorphous silica compound; and 0.05-0.3% alkali metal compound measured as alkali metal oxide, all percentages being based on total content of α-alumina in the mixture. Mixture of particles is then calcined at 1250 to 1470°C to give target carrier.

EFFECT: increased activity of catalyst/carrier combination and prolonged high level of selectivity at moderated temperatures.

21 cl, 3 tbl

FIELD: alternate fuels.

SUBSTANCE: invention relates to production of synthetic gas via catalytic hydrocarbon conversion in presence of oxygen-containing gases and/or water steam as well as to catalysts suitable for this process. Invention provides catalyst, which is complex composite constituted by supported precious element, or supported mixed oxide, simple oxide, transition element, wherein support is a metallic carrier made from metallic chromium and/or chromium/aluminum alloy coated with chromium and aluminum oxides or coated with oxides of chromium, aluminum, or mixtures thereof. Catalyst preparation procedure and synthetic gas production process are also described.

EFFECT: increased conversion of hydrocarbons, selectivity regarding synthetic gas, and heat resistance of catalyst at lack of carbonization thereof.

4 cl, 3 tbl, 9 ex

FIELD: production of honeycomb substrates for catalyst converters for two-wheeled or diesel vehicles.

SUBSTANCE: the invention is dealt with production of honeycomb substrates made out metal sheets piled or rolled in a package and minimized to the honeycomb elements used first of all as honeycomb substrates for catalyst converters in the systems of exhaust gas (EG) neutralization. There is a description of a honeycomb element (1) first of all as a honeycomb substrate for a catalyst converter for systems of two-wheeled vehicles exhaust gas neutralization. The honeycomb substrate for catalyst converter consists of some layers of metal sheets (2, 3) packed as a package or minimized in a roll, which are at least on separate sections are structured or profiled in such a manner, that they form for EG flowing channels (4). At that the metal sheets (2, 3) represent the sheets of high-quality steel of more than 0.08 mm thick with a share of aluminum from 6 up to 12 mass % multiplied by 0.02 mm and divide by "d" - thickness of the metal sheets (2, 3). The technical result - a possibility to use metal sheets depending on the share of aluminum in them and their thickness, that allows to use the sheets taken from production process of manufacture of a material subjected to a hot aluminization.

EFFECT: the invention ensures a possibility to use metal sheets for the purpose depending on the share of aluminum in them and their thickness.

5 cl, 1 dwg

FIELD: gas treatment catalysts.

SUBSTANCE: invention, in particular, relates to internal combustion engine exhaust gas neutralizers. Method of invention comprises rolling refractory metallic tape into block by way of overlapping its smooth and corrugated sides to form channels, performing ultrasound-assisted chemical cleaning of thus rolled tape in alkali solution followed by joining alternate layers of metallic tape with each other by diffusion welding in vacuo within a range of 5·10-5-1·10-5 mm Hg using stepwise heating to 1250 ± 10°С and isothermal exposure to this temperature for 12-17 min to form monolithic structure consisting of triangular and trapezoidal channel at density up to 600 channels per 1 inch2. Invention further describes carrier for catalytic exhaust gas neutralizers representing monolithic metallic structure in the form of cylindrical block or block with oval cross-section, which block consists of parallel channels, 200-600 per 1 inch2, density of channels varying along the cross-section of carrier: from center and extending to 0.55 0,7 diameter if cylindrical block or large axis of oval cross-section, density of channels is 400-600 per 1 inch2 and farther it decreases to 200 or 400 channel/inch2, respectively.

EFFECT: simplified manufacture technology and increased strength of monolithic cellular structure.

4 cl, 4 dwg, 1 tbl

FIELD: heterogeneous catalysts.

SUBSTANCE: catalyst contains porous carrier, buffer layer, interphase layer, and catalytically active layer on the surface wherein carrier has average pore size from 1 to 1000 μm and is selected from foam, felt, and combination thereof. Buffer layer is located between carrier and interphase layer and the latter between catalytically active layer and buffer layer. Catalyst preparation process comprises precipitation of buffer layer from vapor phase onto porous carrier and precipitation of interphase layer onto buffer layer. Catalytic processes involving the catalyst and relevant apparatus are also described.

EFFECT: improved heat expansion coefficients, resistance to temperature variation, and reduced side reactions such as coking.

55 cl, 4 dwg

FIELD: production of non-metallic elements.

SUBSTANCE: reactor comprises means for supplying hydrocarbon raw material and water vapor, means for discharging the product, and porous metallic load-bearing structure that receives catalyzer of reforming with water vapor. The porous load-bearing metallic structure is secured to the inner wall of the reactor by means of gluing or diffusion bounding.

EFFECT: improved functional capabilities.

5 cl, 2 dwg

FIELD: chemical industry; trapping nitric oxides and other harmful substances from the waste gases.

SUBSTANCE: the invention is pertaining to chemical industry and is used for trapping nitric oxides and other harmful substances from the waste gases. The offered reactor contains a body with the connection pipes for introduction of the initial reactants. Inside the body there is a modular catalyst of a cellular structure. The through channels of the catalyst in respect to the incoming stream are oriented at an angel of 90°. The hydraulic diameter of the through channels of the different geometrical shape, beginning from the first channel, along the stream run is monotonically enlarging, reaching the ratio of the hydraulic diameters of the last channel to the first one first channel of no more than 1.5. No more than 1/6-th of the height from the bottom of the block the modular catalyst of the cellular structure has a mesh-cellular structure with a mesh size from 1.5 up to 3 mm and a specific surface up to 8...10 m2/g. The given engineering solution ensures an increased access to the internal surface of the bottom part of the modular catalyst of the cellular structure and its complete participation in operation.

EFFECT: the invention ensures an increased access to the internal surface of the bottom part of the modular catalyst of the cellular structure and its complete participation in operation.

4 dwg

FIELD: catalyst preparation.

SUBSTANCE: invention relates to supported catalysts and provides a method for preparing catalyst-containing solid product comprising step, wherein ceramic carrier is applied onto metallic surface, and depositing catalytically active material onto ceramic carrier, which was preliminarily coated with supporting porous metallic material, ceramic carrier being applied onto and/or into supporting porous metallic material. Invention also describes device used in preparation of catalyst-containing solid product for applying supporting porous material onto inside or outside metallic surfaces of the hollow body.

EFFECT: increased stability of catalyst.

7 cl, 2 dwg

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to technology for preparing caprolactam by the cyclization reaction of derivatives of aminocaproic acid. Method is carried out by cyclizing hydrolysis of compound chosen from the group comprising aminocaproic acid esters or amides, or their mixtures. The process is carried out in the presence of water, in vapor phase at temperature 200-450°C in the presence of a solid catalyst comprising of aluminum oxide that comprises at least one macroporosity with pores volume corresponding to pores with diameter above 500 Å taken in the concentration 5 ml/100 g of above. Preferably, the specific square of catalyst particles is above 10 m2/g and the total volume of pores is 10 ml/100 g or above wherein pores volume corresponds to pores with diameter above 500 Å is 10 ml/100 g or above. Invention provides improving the process indices due to the improved properties of the solid catalyst.

EFFECT: improved preparing method.

5 cl, 2 ex

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