Method of preparing catalyst-containing solid product and device for applying supporting porous material onto inside or outside metallic surface of a hollow body
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
The present invention relates to catalysts on a carrier, in particular to a method for having the catalyst solid product and device for applying a supporting porous metal material on the inner or outer metal surface of the hollow body.
The term with the catalyst solid product, as used within this application, refers to a catalytically active product, having a catalyst deposited on a metal surface. The catalysts deposited on a metal surface, useful in some applications.
The coating of catalytically active material on a metal surface is a well-known process, commonly referred to as the wet method, disclosed, for example, in the publication "Structured catalysts and reactors ("Structured catalysts and reactors" "), authors: Cybulski, A, and Moulijn, J.A., publisher Marcel Dekker, Inc., New York, 1998, Chapter 3 and references therein.
According to the known methods suitable metallic material, preferably ferrite steel containing chromium and/or aluminum, is heated to a temperature usually above 800°to get the surface layer of chromium oxide and/or aluminum. This layer promotes good adhesion of the ceramic material to the surface of the steel. A thin layer of a suspension containing precursor is eroticheskoe material, applied to this surface by known techniques, for example by spraying, smearing, or dipping. After coating the slurry is dried and calcined at a temperature usually between 350 and 700°C. Finally, the ceramic layer is impregnated with a catalytically active material. There is another way, when the catalytically active material is applied simultaneously with the ceramic precursor.
With the application of the catalyst on the metal surface by known methods involve certain disadvantages. Can only be used a certain combination of catalyst and metal, as must be received by the adhesion of the ceramic material to the metal surface. Moreover, even if the adhesion is obtained, the catalyst coating can be damaged, if the adhesion force is reduced due to conditions, subjected to the catalyst. Destruction of the catalytic coating may be caused by thermal stress, dust and other factors.
The present of the invention is to provide a method of obtaining having the catalyst solid product that does not evince the above disadvantages.
The problem is solved by the proposed method of obtaining having solid catalyst products, which includes stages of deposition of ceramic but is of Italia on the metal surface and the coating of catalytically active material on a ceramic carrier, which is that before applying the ceramic material to the metal surface cause supporting porous metal material, and the application of ceramic media carry on and/or in support of a porous metal material.
Supporting porous metal material having a higher strength as compared with a ceramic material, preferably applied to the metal surface. Supporting porous metal material preferably is a metal foam, a metal mesh, expanded metal, sintered metal, metal mesh fabric, etc. Supporting porous metal material is applied on a metal surface, for example, by a method of brazing or diffusion bonding. After that, the ceramic precursor in the form of a suspension contribute into the porous structure of the porous metal support material in a known manner, for example by spraying, smearing, or dipping. The suspension is then dried and calcined. And finally, the ceramic layer is impregnated with a catalytically active material in accordance with known methods. There is another way, when the catalytically active material is precipitated simultaneously with the ceramic precursor. Application support is the future of the porous metal material on the metal surface can also be implemented in the mobile area, heating, where it is possible to apply mechanical pressure.
The present invention also relates to a device for applying a supporting porous metal material on the inner or outer metal surface of the hollow body, for example, a tube containing induction furnace with zone heating, which is adapted for partial heating of the metal surface, and a piston located within the zone of heating and holding the supporting porous metal material to the metal surface.
Supporting porous metal material, after suitable pre-processing of this material and the tube is installed in the tube by solder. The tube is placed in the induction furnace so that part of the tube was heated above the temperature of the soldering. Use the piston in the form of a mandrel or a sphere (ball)to pin supporting porous metal material to the tube wall in the area of soldering to ensure contact between the supporting porous metal material and the wall of the tube.
A variant embodiment of the proposed device createcase shown in figure 1.
Zone heating 1 and the mandrel 2 advancing along the tube 3 to provide a solder-supporting porous metal material 4 along the entire length of the tube. In addition, sabreena applicable to other geometry, different from the geometry of the round tubes, when using a mandrel of appropriate shape. Induction furnace can also be used for drying and calcination of the catalyst.
Figure 2 shows another variant embodiment of the invention for applying a supporting porous metal material to the outer wall of the tube. As can be seen in figure 2, the annular frame 5 serves to clamp the supporting porous metal material 4 to the outer wall of the tube in a manner similar to the already described manner.
The invention is illustrated by the following example.
A rectangular piece of Nickel foam roll with the formation of the cylinder and on the outer surface of the Nickel foam rolled plate-solder type MBF 51 (foil Nickel-based). The obtained compound is injected into the tube with an inner diameter of 45 mm, made of alloy 800, representing an alloy based on iron, Nickel and chromium. The width of the compound chosen, taking into account the internal perimeter of the tube. Open ends of the tube is closed by a loose placement of the shutter in which the hole.
Through the opening of one gate (end 1) pass containing hydrogen and argon gas, which comes out at the other end (end 2). Through the hole on the other shutter (end 2) place the piston is placed at the end of ODA is vcoi. The induction coil is placed around the tube in the same place inside the tube is mandrel. Induction coil gives off heat, and the receiver moves along the coil while maintaining the position of the fixed mandrel. The mandrel is slightly greater than the area subjected to heat. In this zone, the solder is melted by pressing the Nickel foam to the wall of the tube. Outside exposed to the heating zone of the mandrel still extrude Nickel foam to the wall of the tube as long as the temperature is not low enough to ensure solidification of the solder. When moving the tube through the induction coil layer of Nickel foam firmly associated with the inner wall of the tube along its entire length except for the end of 1, corresponding to the width of the induction coil. Therefore, the induction coil cannot pass the gate at the end of the 1st. After application of the specified compound consistently applied ceramic carrier and a catalytically active material by known methods.
1. The method of obtaining having solid catalyst products, which includes stages of deposition of ceramic media on the metal surface and the coating of catalytically active material on the ceramic carrier, wherein before applying the ceramic material to the metal surface cause supporting porous IU allicance material, and the application of ceramic media carry on and/or in support of a porous metal material.
2. The method according to claim 1, characterized in that the supporting porous metal material is applied on a metal surface by prepaymania or diffusion bonding.
3. The method according to claim 1, characterized in that the supporting porous metal material is applied on a metal surface by applying mechanical pressure.
4. The method according to claim 1, characterized in that the supporting porous metal material is applied on the metal surface in the mobile zone heating.
5. The method according to claim 1, characterized in that the supporting porous metal material is applied on a metal surface by placing a metal surface in the mobile zone heating and applying it in the area of heating mechanical pressure.
6. The method according to any one of claims 1 to 5, characterized in that the supporting porous metal material applied to the surface of the tube.
7. The device used in the method of obtaining having solid catalyst product according to claims 1-6, for applying supporting porous metal material on the inner or outer metal surface of the hollow body, characterized in that it contains induction the Yu furnace with zone heating adapted for partial heating of the metal surface, and a piston located within the heating zone, for clamping the supporting porous metal material to the metal surface.
FIELD: production of carbon carrier for catalysts.
SUBSTANCE: proposed method includes heating of moving layer of granulated furnace black used as backing, delivery of gaseous or vaporous hydrocarbons into soot layer followed by their thermal decomposition on soot surface forming layer of pyrocarbon at forming of layer of pyrocarbon and activation of material compacted by pyrocarbon at temperature of 800-900°C and unloading of finished product. Granulated furnace black at specific surface of 10-30 m2/g and adsorption rate of 95-115 ml/100 g is used as backing for compacting with pyrocarbon. Then, product is subjected to activation for obtaining total volume of pores of 0.2-1.7 cm3/g. Black is compacted by pyrocarbon at two stages: at first stage, granulated black is compacted to bulk density of 0.5-0.7 g/cm3, after which material is cooled down and screened at separation of fraction of granules of 1.6-3.5 mm; at second stage, this fraction is subjected to repeated pyrolytic compacting to bulk density of granules of 0.9-1.1 g/cm3.
EFFECT: enhanced economical efficiency; increased productivity of process.
FIELD: organic synthesis catalysts.
SUBSTANCE: invention relates to methods of preparing catalysts based on sulfurized styrene/divinylbenzene copolymer and thermoplastic polymer material, which are used in processes for preparing alkyl tert-alkyl ethers, hydration of olefins, dehydration of alcohols, preparation of esters, and the like. Invention provides molded ionite catalyst consisted of sulfurized styrene/divinylbenzene copolymer in the form of mixture of powdered copolymers with macroporous and gel structure and, as thermoplastic material, propylene polymers and propylene/ethylene copolymers. Preparation of catalyst is accomplished by extrusion at temperature of heating extruder cylinder 140-200°C and temperature of forming head equal to temperature of the last heated zone of heating cylinder.
EFFECT: increased catalytic activity.
10 cl, 3 tbl, 15 ex
FIELD: alternative fuel production and catalysts.
SUBSTANCE: invention relates to (i) generation of synthesis gas useful in large-scale chemical processes via catalytic conversion of hydrocarbons in presence of oxygen-containing components and to (ii) catalysts used in this process. Catalyst represents composite including mixed oxide, simple oxide, transition element and/or precious element, carrier composed of alumina-based ceramic matrix, and a material consisting of coarse particles or aggregates of particles dispersed throughout the matrix. Catalyst has system of parallel and/or crossing channels. Catalyst preparation method and synthesis gas generation method utilizing indicated catalyst are as well described.
EFFECT: enabled preparation of cellular-structure catalyst with high specific surface area, which is effective at small contact times in reaction of selective catalytic oxidation of hydrocarbons.
6 cl, 2 tbl, 16 ex
FIELD: petrochemical process catalysts.
SUBSTANCE: catalyst constitutes cements formed during heat treatment and depicted by general formula MeO·nAl2O3, where Me is at least one group IIA element and n is number from 1.0 to 6.0, containing modifying component selected from at least one oxide of magnesium, strontium, copper, zinc, indium, chromium, manganese, and strengthening additive: boron and/or phosphorus oxide. The following proportions of components are used, wt %: MeO 10.0-40.0, modifying component 1.0-5.0, boron and/or phosphorus oxide 0.5-5.0, and alumina - the balance. Catalyst is prepared by dry mixing of one group IIA element compounds, aluminum compounds, and strengthening additive followed by mechanochemical treatment on vibromill, molding of catalyst paste, drying, and calcination at 600-1200°C. Modifying additive is incorporated into catalyst by impregnation and succeeding calcination. Method of pyrolysis of hydrocarbon feedstock producing C2-C4-olefins is also described.
EFFECT: increased yield of lower olefins.
3 cl, 2 tbl, 18 ex
FIELD: supported catalysts.
SUBSTANCE: invention claims a method for preparation of catalyst using precious or group VIII metal, which comprises treatment of carrier and impregnation thereof with salt of indicated metal performed at working pressure and temperature over a period of time equal to or longer than time corresponding most loss of catalyst metal. According to invention, treated carrier is first washed with steam condensate to entirely remove ions or particles of substances constituted reaction mixture, whereupon carrier is dried at 110-130oC to residual moisture no higher than 1%.
EFFECT: achieved additional chemical activation of catalyst, reduced loss of precious metal from surface of carrier, and considerably increased lifetime.
5 cl, 9 ex
FIELD: petroleum processing catalysts.
SUBSTANCE: invention provides reforming catalyst containing Pt and Re on oxide carrier, in particular Al2O3, wherein content of Na, Fe, and Ti oxides are limited to 5 (Na2O), 20 (Fe2O3), and 2000 ppm (TiO2) and Pt is present in catalyst in reduced metallic state and in the form of platinum chloride at Pt/PtCl2 molar ratio between 9:1 and 1:1. Contents of components, wt %: Pt 0.13-0.29, PtCl2 0.18-0.04, Re 0.26-0.56, and Al2O3 99.43-99.11. Preparation of catalyst comprises impregnation of alumina with common solution containing H2PtCl6, NH4ReO4, AcOH, and HCl followed by drying and calcination involving simultaneous reduction of 50-90% platinum within the temperature range 150-550оС, while temperature was raised from 160 to 280оС during 30-60 min, these calcination conditions resulting in creation of reductive atmosphere owing to fast decomposition of ammonium acetate formed during preparation of indicated common solution.
EFFECT: increased catalytic activity.
2 cl, 1 tbl, 3 ex
FIELD: hydrocarbon conversion catalysts.
SUBSTANCE: catalyst for generation of synthesis gas via catalytic conversion of hydrocarbons is a complex composite composed of ceramic matrix and, dispersed throughout the matrix, coarse particles of a material and their aggregates in amounts from 0.5 to 70% by weight. Catalyst comprises system of parallel and/or crossing channels. Dispersed material is selected from rare-earth and transition metal oxides, and mixtures thereof, metals and alloys thereof, period 4 metal carbides, and mixtures thereof, which differ from the matrix in what concerns both composition and structure. Preparation procedure comprises providing homogenous mass containing caking-able ceramic matrix material and material to be dispersed, appropriately shaping the mass, and heat treatment. Material to be dispersed are powders containing metallic aluminum. Homogenous mass is used for impregnation of fibrous and/or woven materials forming on caking system of parallel and/or perpendicularly crossing channels. Before heat treatment, shaped mass is preliminarily treated under hydrothermal conditions.
EFFECT: increased resistance of catalyst to thermal impacts with sufficiently high specific surface and activity retained.
4 cl, 1 tbl, 8 ex
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: 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: 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: 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: 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