Element with a honeycomb structure, coupled with the tubular casing only in some areas
(57) Abstract:Element with a honeycomb structure can be used in the device catalytic conversion of exhaust gases in the EXHAUST system, in particular in the EXHAUST system of a heat engine, preferably an internal combustion engine with spark ignition. Element (2) with a honeycomb structure is surrounded by a smooth plot (8,9) sheet metal passing in the axial direction of the length of the element (2) with a honeycomb structure. Edges of the metal sheets of cellular element fitting within at least one smooth area. Sheet metal is an integral part of the element with a honeycomb structure and is located in the axial area between the element with a honeycomb structure and a tubular casing (1). In this axial zone eliminates unwanted solder element (2) with a honeycomb structure to the tubular casing (1) regardless of the method of soldering. 4 C.p. f-crystals, 7 Il. The present invention relates to an element with a honeycomb structure for the passage of exhaust gases, which can be applied, in particular, in the device for catalytic conversion of exhaust gases in the EXHAUST system, especially in S="ptx2">Element with a honeycomb structure made in the form adjacent to each other rolled or typed in the package at least partially structured metal sheets to form between their layers of flow channels through which the exhaust gases located in the tubular casing and soldered thereto in the axial direction on a portion of its length. Such an element with a honeycomb structure known from the application DE 2924592 A1. To connect this item with the tubular casing in DE 2924592 proposed, in particular, to immerse mounted in a tubular housing element of its end surfaces in the tub with the binder, resulting in the formation wetted areas. Then located on the end sides of the wetted zone through a sieve put a layer of solder coming from the drive with flux. After that, the element with a honeycomb structure coated with thus you solder layer to the tubular casing in a vacuum or in a protective gas atmosphere.In addition, DE 2924592 proposed to immerse the end surface is installed in a tubular casing element in the molten solder.From the application DE 4306052 A1 also known element with a honeycomb structure for the passage of exhaust ha is smooth and corrugated metal sheets, which folded into a roll to form between the layers of channels for the passage of gas. With smooth metal sheet is located outside. For reliable connection by soldering element with the tubular casing has a smooth metal sheet is made with a large number of holes, evenly spaced around the outer perimeter of the element. From WO 93/12904 known method of soldering the housing of the catalytic Converter of the EXHAUST gas. The solder applied on the metal sheet element with a honeycomb structure as follows: first, the flux with the corresponding grain size is dispersed in a fluid mixture of a binder with a liquid, and then the dispersion is passed through the flow channels in the element. After that, the excess mixture is removed from the channels of the element.Using the methods described in DE 2924592 and WO 93/12904, make the body of the Converter, in which the outer zone of the element with a honeycomb structure soldered to the tubular casing. As a result, between element with a honeycomb structure and a tubular casing formed of a rigid connection.From WO 94/06594 already known method, in which an element with a honeycomb structure you solder to tubular casing only on a certain site in the axial direction, for ment with a honeycomb structure is inserted into this tubular casing.From WO 93/25339 known another way of soldering element with a honeycomb structure to the tubular casing, in which the solder is applied to the end sides of the element with a honeycomb structure along its length.In the implementation of most of the known methods of soldering, such that the solder is applied from the side of the ends, a metal sheet element with a honeycomb structure not only are soldered to each other, but also forms a connection between the element and the tubular casing. This is, in particular, in devices with a cellular structure made up of a large number of mostly spiral or voluntourism rolled metal sheets, as well as in a spiral twisted elements with a honeycomb structure with a corrugated outer layer. Therefore, in such ways soldering targeted connection element with a honeycomb structure with a tubular casing only on a certain section in the axial direction is difficult. Often there are additional connections between the element and the tubular casing, especially on the flanks.Because the element with a honeycomb structure and a tubular casing have different thermal expansion characteristics, the CPF is with a honeycomb structure may experience heat stress, which can lead to damage.The basis of the invention was based on the task to improve the known element with a honeycomb structure, in order to avoid prepaymania it to the tubular housing in certain areas in the axial direction regardless of the method of soldering.This task in accordance with the invention is solved using the proposed element with a honeycomb structure for the passage of exhaust gases, made in the form adjacent to each other rolled or typed in the package at least partially structured metal sheets to form between their layers of flow channels installed in the tubular casing and soldered thereto in the axial direction on a portion of its length, with at least one metal sheet has at least one smooth area, passing at least one end side of the element on part of its length in the axial direction and at least partially covering it. In accordance with the invention in that the element edges of the metal sheets fit within at least one smooth area.In a preferred embodiment of the invention at least one metalliche to the coupling of the tubular casing.Preferably also, when the edge of the pack twisted in mutually opposite directions respectively around the at least two anchor points, and the smooth section is provided on sheet metal, located approximately in the middle of the pack.It is advisable smooth areas to have partial overlap in the direction of the coverage items.When two or more smooth area can be arranged with full joint coverage element.Element with a honeycomb structure according to the invention, which preferably can be applied in the device catalytic conversion of exhaust gases in the EXHAUST system, is attractive because of the smooth segment passing at least one end-side part of its length in the axial direction and at least partially covering it, forms a perimeter member of the outer layer, which is adjacent to the tubular casing. Because smooth land adjacent to the tubular casing, regardless of the method of soldering the solder may not get fully or partially between the smooth portion and a tubular casing. The application of the solder can be carried out in a known manner in the part length in its axial direction and a smooth plot comes in the axial direction only to the area of connection between the element and the tubular casing, then it offers the possibility of thermal expansion in the axial direction of the element because the element is connected to a tubular casing in only one or a few areas. In other areas of the element and the tubular casing is undesirable prepaymania to each other. In addition, the solder may be applied to one or both end sides of the element along its length and when this does not happen the connection of the external layer of the element with the tubular casing. Another advantage of this design element is that in its manufacture in the case of prepaymania only one face side does not matter which one end side of the element along its length causing the solder. It simplifies the manipulation and manufacture of such element with a honeycomb structure.Other advantages of the invention will become clearer from the following description of examples of its implementation with reference to the accompanying drawings, where:
in Fig. 1 shows a schematic longitudinal section of an element with a honeycomb structure with a tubular casing,
in Fig. 2 - S-shaped twisted element with a honeycomb structure,
in Fig. 3 is a schematic representation of an element with a honeycomb structure, impoverishes section,
in Fig. 5 in an enlarged scale the V-cut of the marginal zone of the element with a honeycomb structure according to Fig. 3,
in Fig. 6 is a first embodiment of a smooth plot,
in Fig. 7 is a second embodiment of a smooth plot.In Fig. 1 schematically shows a device for the catalytic conversion of exhaust gases in the EXHAUST system, in particular in the EXHAUST system heat engines, preferably internal combustion engines with spark ignition. The device includes mounted in a tubular casing 1 element 2 with a honeycomb structure, through which the exhaust gases and in which the flow channels 3 are formed between adjoining to each other by layers of smooth metal sheets 4 and structured, preferably corrugated, metal sheets 5. Element 2 with a honeycomb structure is connected to a tubular casing 1 on a portion of its length L in the axial direction. In Fig. 1, the connection zone between the element 2 with a honeycomb structure and the tubular casing 1 is indicated by item 12.Element 2 with a honeycomb structure has on the metal sheet 5 of the first 9 and second 10 smooth areas that surround its perimeter. The first 9 and second 10 plots are from the end faces of the organisations of the element 2 with the tubular casing 1.In Fig. 2 shows a second exemplary embodiment of an element with a honeycomb structure. For simplification in Fig. 2-5 image is not displayed tubular casing 1. Element 2 with a honeycomb structure consists of typed in the package 13 smooth 4 and 5 corrugated metal sheets. The edges of the package 13 twisted in mutually opposite directions, respectively, around the anchor points 14, 15. In the element with a honeycomb structure provided with two sheet metal 16, 17, each of which has a smooth sections 8 or 9. Smooth metal sheets 16, 17 form the outer layers of the package 13.Each of smooth sections 8, 9 comes to an adjacent parcel 9 or 8 sheet metal 16 or 17.In Fig. 3 shows a second exemplary embodiment of an element with a honeycomb structure. This element with a honeycomb structure also consists of typed in the package 13 of the metal sheets 4, 5, which form flow channels 3 for the passage of gas. The package 13 is curled around the anchor points 14, 15. In the package 13 is provided sheet metal 18, one of the sections 10 which is made of a smooth and has such a size that it covers the element with a honeycomb structure around the perimeter.In Fig. 4 shows another variant embodiment of the invention. Approx what their areas 10, 20 completely cover the perimeter of the element 2 with a honeycomb structure.In Fig. 5 in an enlarged scale shows how smooth section 10 shown in Fig. 3, adjacent to typed in the package 13 metal sheets 4, 5.In Fig. 6 and 7 show plots 8, 9 sheet metal. In the embodiment of Fig. 6 between the parts 8, 9 includes a neck 21, which leaves the free zone 12 of the connecting element 2 with a honeycomb structure with a tubular casing 1. May also include other smooth areas, performed with deviation from each other and placing between them a cut. The geometry of smooth sections can be selected in accordance with the form of the connection zone. 1. Element with a honeycomb structure for the passage of exhaust gases, made in the form adjacent to each other rolled or typed in the package at least partially structured metal sheets to form between them a layer of flowing channels, mounted in a tubular casing and soldered thereto in the axial direction on a portion of its length, with at least one metal sheet has at least one smooth segment passing at least one Torrevieja fact, the edges of metal sheets fit within at least one smooth area.2. Element with a honeycomb structure on p. 1, characterized in that the at least one metal sheet has first and second smooth areas, running from the end sides of the element and reaching up to areas the coupling of the tubular casing.3. Element with a honeycomb structure under item 1 or 2, characterized in that the edges of the package twisted in mutually opposite directions respectively around the at least two anchor points, and the smooth section is provided on sheet metal, located approximately in the middle of the pack.4. Element with a honeycomb structure according to any one of paragraphs.1 to 3, characterized in that smooth areas are partially overlapping in the direction of the cover element.5. Element with a honeycomb structure according to any one of paragraphs.1 to 4, characterized in that two or more smooth plot is located with the option of a joint coverage member.
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.
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
FIELD: catalyst preparation methods.
SUBSTANCE: method involves preparing porous carrier and forming catalyst layer by impregnation of carrier with aqueous solution of transition group metal salts followed by drying and calcination. Porous catalyst carrier is a porous substrate of organic polymer material: polyurethane or polypropylene, which is dipped into aqueous suspension of powdered metal selected from metals having magnetic susceptibility χ from 3.6·106 to 150·106 Gs·e/g: iron, cobalt, chromium, nickel, or alloys thereof, or vanadium and polyvinylacetate glue as binder until leaving of air from substrate is completed, after which carrier blank is dried at ambient temperature and then fired at 750°C in vacuum oven and caked at 900-1300°C. Caked blank is molded and then subjected to rolling of outside surface to produce carrier having variable-density structure with density maximum located on emitting area. Formation of catalyst layer is achieved by multiple impregnations of the carrier with aqueous solution of acetates or sulfates of transition group metals: iron, cobalt, chromium, nickel, or alloys thereof in alternative order with dryings at ambient temperature and calcinations to produced catalyst bed 50-80 μm in thickness. In another embodiment of invention, formation of catalyst layer on carrier is accomplished by placing carrier in oven followed by forcing transition group metal carbonate vapors into oven for 60-120 min while gradually raising oven temperature to 850°C until layer of catalyst is grown up to its thickness 50-80 μm.
EFFECT: improved quality of catalyst and reduced its hydrodynamic resistance.
8 cl, 1 tbl, 3 ex
FIELD: catalyst preparation methods.
SUBSTANCE: invention relates to a method for preparing catalyst and to catalyst no honeycomb-structure block ceramic and metallic carrier. Preparation procedure includes preliminarily calcining inert honeycomb block carrier and simultaneously applying onto its surface intermediate coating composed of modified alumina and active phase of one or several platinum group metals from water-alcohol suspension containing, wt %: boehmite 15-30, aluminum nitrate 1-2, cerium nitrate 4-8, 25% ammonium hydroxide solution 10-20, one or several precipitate group metal salts (calculated as metals) 0.020-0.052, water-to-alcohol weight ratio being 1:5 to 1:10; drying; and reduction. Thus prepared catalyst has following characteristics: specific coating area 100-200 m2/g, Al2O3 content 5-13%, CeO2 content 0.5-1,3%, active phase (on conversion to platinum group metals) 0.12-0.26%.
EFFECT: simplified technology due to reduced number of stages, accelerated operation, and high-efficiency catalyst.
5 cl, 1 tbl, 10 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for liquid-phase catalytic alkylation of aromatic amines. Method involves alkylation reaction of aromatic amines in the presence of hydrogen and lower alcohols at temperature 50-70°C on a heterogeneous catalyst. The distinctive specificity of method represents alkylation of amine with formaldehyde solution in reactor with reaction zone filled with catalyst consisting of aluminum oxide-base block high-porous cellular carrier with porosity value 7-95%, not less, and palladium as an active component with the mass content = 1.3-2%. As a rule, in the alkylation process catalyst prepared by impregnation of block high-porous cellular carrier with palladium salts treated preliminary in the constant magnetic field is used. Usually, in the case of alkylation of aniline and for preferential synthesis of monomethylaniline the molar ratio aniline to formaldehyde solution = 1.6:(1.1-1.6) is used. Proposed method as compared with the nearest analog in the case of alkylation of aniline provides preparing monomethylaniline mainly, to decrease the content of palladium as an active component in catalyst and to decrease the reaction pressure and hydraulic resistance of catalytic layer also. Invention can be used in producing antiknock additives to motor fuels (gasolines).
EFFECT: improved alkylation method.
3 cl, 4 ex