1034 results about "Dehydrogenation" patented technology

The invention relates to the technical field of catalyst carriers, and discloses reticular porous spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing an aluminum source, acid, a pore-forming agent, a surfactant and water to obtain pseudo sol; (2) performing ultrasonic treatment and oil ammonia column forming treatment on the pseudo sol obtained in the step (1) to obtain gamma-Al2O3 spherical gel beads; and (3) aging, washing, drying and calcining the gamma-Al2O3 spherical gel beads obtained in the step (2) to obtain the reticular porous spherical alumina. The spherical aluminum oxide prepared by the method has abundant communicated reticular pore channels, is obviously distributed in mesopore and macropore ranges, is beneficial to obviously improving dispersion and loading of a catalyst in an aluminum oxide carrier and improving the performance of petroleum reforming and propane dehydrogenation, and has industrial production utilization value and commercial value.

The invention discloses a green synthesis ammonia and organic liquid hydrogen storage combined device. The device comprises a water electrolysis hydrogen production device, a nitrogen production device, an organic liquid hydrogen storage device, a low-pressure gas compressor, a synthesis gas compressor and an ammonia synthesis device, the water electrolysis hydrogen production device produces hydrogen and conveys the hydrogen to the organic liquid hydrogen storage device and the synthesis gas compressor; the nitrogen making device is used for making nitrogen and conveying nitrogen to the organic liquid hydrogen storage device and the synthesis gas compressor; the organic liquid hydrogen storage device reacts hydrogen-poor organic liquid with hydrogen generated by the water electrolysis hydrogen production device to generate hydrogen-rich organic liquid, nitrogen is introduced into the hydrogen-rich organic liquid for dehydrogenation reaction, and the hydrogen and the nitrogen are input into the low-pressure gas compressor; the low-pressure gas compressor and the synthesis gas compressor compress hydrogen and nitrogen and input the compressed hydrogen and nitrogen into the ammonia synthesis device; and the ammonia synthesis device generates ammonia under the action of the catalyst. The gas-liquid mass transfer efficiency and the hydrogen desorption rate are improved, the energy consumption and the operation and maintenance cost of the compressor are reduced, and accurate adjustment of the hydrogen-nitrogen ratio is achieved.

The invention relates to the technical field of reactors, in particular to a partition annular electric heat tracing radial propane dehydrogenation reactor and a heating method thereof.The partition annular electric heat tracing radial propane dehydrogenation reactor comprises a reactor shell, a reaction cavity is formed in the reactor shell, and a heat preservation layer is arranged in an interlayer in the reactor shell; the radial bed layer structure is arranged in the reaction cavity and comprises an inner cylinder and an outer cylinder which are concentrically arranged, as well as a catalyst bed layer and an electric heat tracing system which are filled between the inner cylinder and the outer cylinder, and the electric heat tracing system comprises a plurality of electric heat tracing assemblies and a power supply module; the temperature control system comprises temperature sensors arranged in the annular heating areas in a distributed mode and a controller. Compared with the prior art, the electric heat tracing assembly is directly buried in the catalyst bed layer, energy is supplied to all the areas through the independent power supply branch circuits, power is independently adjusted through the controller, partition differentiation heat compensation can be implemented according to the difference that heat dissipation of the outer ring is higher and heat absorption of the inner ring is higher, and the radial temperature difference and local temperature fluctuation of the bed layer are remarkably reduced.

This invention discloses a method for modifying the support medium of a Pd catalyst and its application. The preparation method of the Pd catalyst includes reacting zirconium salt, organic ligands, and acid to obtain a support UiO-66-X; then loading Pd onto the support UiO-66-X and reducing it to obtain the catalyst Pd@UiO-66-X; the organic ligands include 2-nitroterephthalic acid, 2-methoxyterephthalic acid, 2-aminoterephthalic acid, and terephthalic acid, and X is selected from NO2, OMe, NH2, and H. This invention changes the surface electron cloud density of the supported Pd nanoparticles by changing the ligands (-NO2, -H, -OMe, -NH2) of the support UiO-66, resulting in different abilities to activate hydrogen, thereby regulating the dehydrogenation and hydrogenation reactions in the racemicization process of Pd catalysis. The synergistic effect of different ligands with Pd changes the racemicization catalytic activity.

The invention discloses a system and a method for preparing low-carbon olefin through carbon dioxide adsorption and in-situ oxidative dehydrogenation. The invention provides a system and a method for integrating carbon dioxide capture and in-situ oxidation low-carbon alkane (ethane / propane) dehydrogenation, a bifunctional material is composed of an adsorbent and a catalyst, and capture of carbon dioxide and in-situ oxidation low-carbon alkane dehydrogenation can be realized in the same reaction tower, so that the highest one-way carbon dioxide conversion rate can reach 100%, and the conversion rate of carbon dioxide can reach 100%. And meanwhile, the ethylene yield reaches 26%. According to the method, the problems of additional product separation and product gas recycling caused by low carbon dioxide conversion efficiency in the prior art are avoided, and effective heat management is realized, so that the process of integrating carbon dioxide capture and preparing low-carbon olefin by oxidizing low-carbon alkane has more economic advantages.

The invention belongs to the technical field of low-carbon dehydrogenation aids, and particularly relates to a heat balance aid as well as a preparation method and application thereof. The heat balance auxiliary agent comprises Al, Ca, Si, Cu and Mn elements existing in an oxide form; wherein the Al2O3, the CaO and the SiO2 jointly form a skeleton structure of the auxiliary agent, and the CuO and the MnO2 are used as active components and are attached to the skeleton structure; the molar ratio of metal elements in the heat balance auxiliary agent is as follows: Al: Ca: Si: Cu: Mn = (49-78.9): (15-25): (1-10): (5-15): (0.1-1). The heat balance additive prepared by the invention shows excellent anti-sintering capability, long service life and stable heat supply performance under harsh reaction conditions such as propane dehydrogenation, and can effectively improve the selectivity of target olefin and reduce the generation of byproducts such as methane.

The invention discloses a copper-based catalyst for preparing acetaldehyde through ethanol dehydrogenation as well as a preparation method and application of the copper-based catalyst. The preparation method comprises the following steps: S1, carrying out alkalization treatment on protic mordenite in a strong alkali solution to increase the number of surface hydroxyl groups of the protic mordenite; and S2, adding the mordenite obtained in the step S1 into a copper salt solution to load copper ions, and then sequentially carrying out low-temperature drying shaping and medium-temperature activation stages to obtain the copper-based catalyst with networked Cu-OH-Si-O bonds on the surface. Through the synergistic effect of alkali liquor regulation and control and staged oxygen roasting, the dispersity and stability of a Cu active center in the catalyst are improved, the acetaldehyde selectivity of the reaction of preparing acetaldehyde through ethanol dehydrogenation is also improved, and side reactions are inhibited. Carrying out heat treatment regeneration on the inactivated copper-based catalyst in an oxygen-containing atmosphere; and after regeneration, the networked Cu-OH-Si-O bond on the surface of the copper-based catalyst is reconstructed.

The invention relates to the technical field of C9 heavy aromatics, in particular to a method and device for producing mesitylene from C9 heavy aromatics, and the method comprises the following steps: firstly, in the presence of a catalyst, mixing the C9 heavy aromatics with hydrogen, performing dealkylation isomerization reaction and dehydrogenation separation to obtain a liquid-phase product, and then performing two-stage separation on the liquid-phase product to obtain mesitylene. And mesitylene is produced to the maximum extent. The C9 heavy aromatics are subjected to selective dealkylation and trimethylbenzene isomerization reaction, and the obtained product does not contain propylbenzene, and the content of methyl-ethylbenzene is 1t; the method has the advantages that the yield of mesitylene is more than or equal to 0.2%, the interference of methyl ethyl benzene on the separation of the mesitylene is eliminated, the loss of the mesitylene is small, the one-way yield of the mesitylene is more than or equal to 12%, the reaction process is simple, the mesitylene and unsym-trimethylbenzene products are high in purity, the unsym-trimethylbenzene can be recycled to further increase the yield of the mesitylene, the process is flexible, byproducts are few, the product value is high, and the utilization value of C9 heavy aromatic hydrocarbon resources is obviously improved.

A method may include contacting a hydrocarbon-containing feed with a catalyst in a reactor to form an olefin-containing effluent, then at least partially separating the olefin-containing effluent from the catalyst. Passing the catalyst to a combustor and heating the catalyst by combusting a supplemental fuel. The supplemental fuel includes methane in an amount greater than or equal to 1 mol. %. Passing the catalyst from the combustor to the reactor, such that at least a portion of the catalyst continuously cycles between the reactor and the combustor. The catalyst includes from 0.1 wt. % to 10 wt. % of one or more metals chosen from gallium, indium, thallium or combinations thereof, from 5 ppmw to 1000 ppmw of one or more metals chosen from platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof, from 100 ppmw to 30000 ppmw of chromium, and at least 85 wt. % support.

The present invention relates to a non-noble metal long-chain alkane dehydrogenation catalyst, which uses CeO2 and a transition metal M as main active components, and the mass percentage of the transition metal M is 0-30 wt%; wherein M is one or a combination of more of Fe, Co and Ni. Meanwhile, the invention also discloses a preparation method and application of the catalyst. The catalyst provided by the invention shows good dehydrogenation activity and stability in an inert atmosphere. An alternative solution which is low in cost, high in performance and easy to operate is provided for a long-chain alkane dehydrogenation process.

The invention discloses a system and a method for directly preparing ultra-pure nitrogen through rectification dehydrogenation, and relates to the technical field of ultra-pure nitrogen preparation. The system for directly preparing ultra-pure nitrogen through rectification dehydrogenation comprises a main heat exchanger, the bottom of the main rectifying tower is communicated with the main heat exchanger through a pipeline; the subcooler is communicated with the top of the main rectifying tower through a pipeline; the top of the dehydrogenation high-purity nitrogen tower is communicated with the subcooler through a pipeline, a nitrogen exhaust port is formed in the bottom of the dehydrogenation high-purity nitrogen tower along the height of the dehydrogenation high-purity nitrogen tower, and the nitrogen exhaust port is connected with the main heat exchanger through a pipeline. According to the invention, most of substances including oxygen, argon, methane and the like and having higher boiling points than nitrogen in raw material air are separated from nitrogen through the main rectifying tower, impurities having higher boiling points than nitrogen sink while hydrogen is evaporated through the dehydrogenation high-purity nitrogen tower, and vaporized ultra-pure nitrogen is taken out from the side surface of the dehydrogenation high-purity nitrogen tower, so that the purity of the raw material air is improved. Therefore, the purity of the prepared high-purity nitrogen is improved.

The utility model discloses a helium dehydrogenation and purification device taking air as regenerated gas. The helium dehydrogenation and purification device comprises a catalytic dehydrogenation reactor, a first adsorption reactor and a second adsorption reactor, a refrigerant of the heat exchanger is connected with a feed gas source and a compressed air source, a refrigerant outlet of the heat exchanger is connected with an inlet of the catalytic dehydrogenation reactor, an outlet of the catalytic dehydrogenation reactor is connected with a heating medium inlet of the heat exchanger, and a heating medium outlet of the heat exchanger is connected with an inlet of the steam-water separator; inlets of the first adsorption reactor and the second adsorption reactor are connected with an outlet of the steam-water separator and a regenerated waste gas outlet; outlets of the first adsorption reactor and the second adsorption reactor are connected with a product gas outlet and a compressed air source; a hydrogen analyzer and a flow meter are arranged on a pipeline for connecting a refrigerant inlet of the heat exchanger with the feed gas source, and a flow controller and a flow control valve are arranged on a pipeline for connecting the refrigerant inlet of the heat exchanger with the compressed air source; the flow controller is electrically connected with the hydrogen analyzer and the flow meter and can control the opening degree of the flow control valve. The problem that hydrogen-containing gas cannot be provided as regeneration gas in most helium catalytic dehydrogenation purification scenes is solved.

The present invention relates to the preparation of cyantraniliprole, comprising the preparation of 8-methyl-2,4-dioxo-1,4-dihydro-2H-benzo[d][1,3]oxazine-6-carbonitrile key intermediate via 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid. Wherein hydroxylamine attacks a benzylic formyl group, to obtain the 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid, that undergoes simultaneously or by consecutive steps dehydrogenation and cyclization to obtain the benzo[d][1,3]oxazine group and the cyano group of the desired product. In addition, an improved method for the synthesis of the benzylic formyl group is also displayed.

The invention belongs to the technical field of organic liquid hydrogen storage, and discloses a catalyst and a preparation method thereof, and hydrogenation and dehydrogenation methods of a liquid organic hydrogen carrier. The catalyst is used for hydrogenation and dehydrogenation of a liquid organic hydrogen carrier, the catalyst comprises a nickel element and an aluminum element, and the average particle size of the catalyst is 300-900 [mu] m. The catalyst provided by the invention has relatively high hydrogenation and dehydrogenation activity and long-period stability, meanwhile, the preparation cost of the catalyst is greatly reduced compared with that of a traditional noble metal catalyst, and further commercial application of an organic liquid hydrogen storage technology is facilitated.

The invention discloses a metal oxide / carbon / nickel composite material, a preparation method and application of the metal oxide / carbon / nickel composite material to a magnesium-based hydrogen storage material, and belongs to the field of hydrogen storage energy. The problems that a single-component catalyst in the MgH2 hydrogen storage material is low in active site, the interface is inactivated in the circulation process and the like are solved. A metal nickel source and a cerium source are combined with an organic ligand trimesic acid to form bimetal MOF, CeO2 / C / Nix obtained after calcination inherits the high specific surface area of MOF, metal is evenly dispersed in a carbon matrix, CeO2 / C / Nix is introduced into MgH2, microscale efficient catalysis of MgH2 is achieved, when the doping amount of CeO2 / C / Ni20 is 8 wt.%, the initial dehydrogenation temperature is 188.23 DEG C, and when the doping amount of CeO2 / C / Ni20 is 8 wt.%, the initial dehydrogenation temperature is 188.23 DEG C, and the specific surface area of CeO2 / C / Nix is 27.8 wt.%. After 10 cycles, the capacity retention rate is 98.8%, excellent hydrogen storage performance is shown, and a unique insight is provided for large-scale production of the magnesium-based hydrogen storage material.

The invention relates to the technical field of titanium alloy preparation and machining, and particularly discloses a method for preparing a titanium alloy workpiece through near-net forming of titanium hydride powder. The method comprises the steps that after titanium hydride powder and intermediate alloy powder are mixed, cold press molding is conducted under 200-800 MPa, and a pressed blank is obtained; sintering the pressed blank and the mold for the first time at the temperature of 500-1200 DEG C, preserving heat for 10-30 minutes, and then cooling; and the pressed blank is taken out of the mold, secondary sintering is carried out at the temperature of 1200-1400 DEG C, cooling is carried out after heat preservation is carried out for 2-4 hours, and a titanium alloy workpiece is obtained. The method does not include the step of partially dehydrogenating the titanium hydride powder before cold press molding. According to the method, the problem that the titanium hydride pressed blank is easy to crack during demolding is fundamentally solved through the first sintering with the mold by utilizing the volume shrinkage effect in the dehydrogenation process, so that the product percent of pass is greatly improved, and meanwhile, the low hydrogen content (llt of a workpiece is ensured; 0.015%), high density (greater than or equal to 99%) and uniform components.

The invention discloses a citric acid coordination regulated amino-functionalized palladium-silver alloy catalyst as well as a preparation method and application thereof. Nitrogen-doped carbon is used as a carrier, and the palladium-silver alloy catalyst is constructed through coordination-confinement in-situ reduction of citric acid. According to the preparation method, citric acid is introduced, and synergistic interaction of sub-nano-scale dispersion and efficient interface mass transfer is achieved through dual synergistic regulation and control of the size and the interface; the coordination effect enables the palladium-silver alloy to achieve sub-nano-scale superfine dispersion; as a competitive hydrogen bond acceptor / donor, the polycarboxyl group can effectively break an interface hydrogen bond network and inhibit the formation of a tight gas film from the source. The mechanism ensures that the catalyst is always in full contact with a mixed aqueous solution containing formic acid and formate and hydrogen is quickly released during formic acid dehydrogenation hydrogen production reaction, so that the catalyst has excellent anti-poisoning cycling stability while keeping high intrinsic activity, and the technical problem that high activity and long-term stability are difficult to consider at the same time is solved.

Processes for dehydrogenating normal paraffins derived from natural oils to olefins are described. The feed stream is passed through an adsorption bed comprising alkaline or alkaline earth cation exchange X-Zeolite to removes essentially all oxygenates and aromatics from the feed stream. One or more additional adsorbent beds having different adsorbents can also be included to remove additional oxygenates and aromatics as well as sulfur compounds, nitrogen compounds, phosphorous compounds, or combinations thereof. The dehydrogenation process can be part of a process for producing alkylbenzenes from natural oils.

The invention discloses a method for cyclizing imine bonds of Schiff base COFs, and belongs to the field of materials. The method comprises the following steps: mixing Schiff base COFs, pyruvic acid and a solvent, and reacting by taking air as a dehydrogenation reagent to obtain quinoline COFs. The method disclosed by the invention is simple and efficient, the quinoline COFs with different topological structures can be prepared by utilizing the method, and the obtained quinoline COFs keep the crystallinity and porosity of a Schiff base COFs precursor.

The invention relates to a catalyst for preparing cyclododecanone through cyclododecanol dehydrogenation and a preparation method and application thereof. The catalyst component comprises copper, zinc, zirconium, sodium, calcium, aluminum and iron; the catalyst is prepared from the following components in percentage by mass in an oxide form: 40 to 65 weight percent of copper oxide, 10 to 21 weight percent of zinc oxide, 10 to 30 weight percent of zirconium oxide, 5 to 20 weight percent of sodium oxide, 1 to 5 weight percent of calcium oxide, 0.5 to 1.5 weight percent of aluminum oxide and 0.05 to 0.5 weight percent of iron oxide. In one embodiment, according to the preparation method of the catalyst provided by the invention, water vapor is added during roasting in a nitrogen environment, so that the release speed of carbon dioxide is controlled, and formation of carbon deposition in the roasting process is reduced. The catalyst can solve the problem of low selectivity caused by low dehydrogenation reaction conversion rate and many by-product cyclododecene, and has the characteristics of high strength, good hydrothermal resistance, long service life and the like.

This invention provides a LOHC-SOFC-GT system for mobile applications and its decision variable control method. It constructs a deep thermal-mass coupling system between the LOHC dehydrogenation unit and the SOFC-GT power generation unit. Hydrogen produced by the LOHC dehydrogenation unit is directly supplied to the SOFC-GT unit as fuel, while the high-temperature exhaust gas from the SOFC-GT unit provides heat for the dehydrogenation reaction, achieving global coordination and cascaded utilization of multiple energy flows (thermal, electrical, and chemical energy). Based on the influence of system decision variables on different objective functions, this invention proposes a control strategy of "first determining cooperative variables, then adjusting competing variables." This strategy prioritizes setting cooperative variables with consistent directions within a clear and narrow optimal range. Based on this, competing variables are adjusted in a targeted and precise manner according to the specific application scenario's objective emphasis, achieving a precise match between system performance and scenario requirements.

A catalyst and a method for producing the catalyst are provided. An exemplary catalyst is of the formula: Mo a V b Bi c M d O x This formula includes: In this formula, M is Ta or Nb, a is 1.0, b is 0.01 to 0.5, c is 0.005 to 0.2, d is 0.005 to 0.1, and x is the number of oxygen atoms required to make the catalyst electrically neutral. The values ​​of a, b, c, and d are determined based on the amount of each starting material used to form the catalyst. The catalysts provided herein may be suitable as catalysts in oxidative dehydrogenation reactions, such as the oxidative dehydrogenation of ethane.

The present application relates to a kind of self-regeneration fixed bed reaction system for multiphase catalytic reaction, belong to fixed bed technical field.The system includes shell assembly, reaction tank assembly, distribution disc assembly and regeneration connecting assembly.Shell is separated to form several sectors, each sector is equipped with reaction tank, and isolation chamber is formed between reaction tank.Regeneration connecting assembly includes upper and lower rotating disc connected by rotating shaft, and inert gas containing cavity is arranged in rotating disc and is communicated with isolation chamber.Driving mechanism rotates rotating disc, so that regeneration pipe is communicated with specific reaction tank and carries out on-line carbon burning regeneration.The present application realizes the continuous production mode of "multi-zone reaction, one area on-line regeneration" by rotating structure, cooperates with the unique scraping seal assembly and elastic buffer structure, solves the pain points such as fast coking of catalyst in high-temperature dehydrogenation and other reactions, frequent switching, easy to string gas and thermal stress damage, significantly improves the production efficiency, operating stability and heat energy utilization rate of device.

The present invention provides a hydrogen removal device for a steel sheet, a manufacturing system for a steel sheet, and a manufacturing method for a steel sheet, which can produce a steel sheet having excellent hydrogen embrittlement resistance without changing the mechanical properties of the steel sheet. The hydrogen removal device includes a housing portion that houses a steel sheet coil in which a steel strip is wound in a roll shape, and a vibration application device that applies vibration to the steel sheet coil housed in the housing portion in such a manner that the frequency of the vibration of the steel sheet coil is 100 to 100,000 Hz and the maximum amplitude of the steel sheet coil is 10 nm to 500 μm.

The invention discloses a low-carbon hydrocarbon / alcohol aromatization Zn / ZSM-5 catalyst as well as a preparation method and application thereof, and belongs to the technical field of aromatization catalysts. By adjusting the pH value of the zinc solution used in the preparation process of the Zn / ZSM-5 catalyst, the distribution and existence form of Zn species on the HZSM-5 molecular sieve can be effectively regulated and controlled, so that the dehydrogenation capability and aromatization selectivity of the Zn / ZSM-5 catalyst are remarkably improved. Meanwhile, by optimizing the existence state of the Zn species, the loss of the Zn species under the high-temperature reaction condition can be effectively reduced, and the service life of the catalyst is remarkably prolonged. In addition, the preparation method provided by the invention is simple in process, convenient to operate and suitable for large-scale industrial production, and has a wide application prospect.

This invention belongs to the field of photocatalytic materials and new energy technology, and discloses a method for preparing a Rh-modified Cs₂AgBiBr₆ / CdS heterojunction photocatalyst. The method includes: preparing Cs₂AgBiBr₆ nanoparticles via antisolvent precipitation, preparing CdS nanorods via hydrothermal method, subsequently constructing a heterojunction through in-situ growth, and loading a Rh co-catalyst using photoreduction. This invention effectively overcomes the technical bottleneck of structural instability of traditional perovskites in polar solvents by introducing a Cs₂AgBiBr₆ double perovskite with a rigid lattice structure. Experiments show that the catalyst retains its structural integrity after immersion in ethanol for 168 hours and under different atmospheres, and exhibits excellent performance in the photocatalytic dehydrogenation of ethanol, with a hydrogen production rate as high as 49.15 mmol·g⁻¹. ‑1 ·h ‑1 The apparent quantum efficiency at 420 nm is 22.5%, and it remains stable during a 60-hour continuous reaction. This invention provides a new strategy for developing efficient and stable lead-free perovskite photocatalytic systems.

The application belongs to a supported catalyst, and discloses a synergistic platinum-based propane dehydrogenation cascade catalytic system as well as a preparation method and application thereof, which comprises a first catalytic unit and a second catalytic unit through physical mixing, the first catalytic unit comprises a SiO2 carrier and a Pt-based dehydrogenation active component supported on the surface of the carrier, and the Pt-based dehydrogenation active component is Pt or PtSn; the second catalytic unit comprises an Al2O3 carrier and a functional oxide component supported on the surface of the carrier; and the first catalytic unit and the second catalytic unit are physically mixed through any one of particle mixing and powder mixing. According to the application, the spatial distribution mode of different catalytic units in a reaction system is reasonably designed, the behavior of intermediates and carbon species in a reaction process is effectively controlled while ensuring that the propane dehydrogenation reaction is efficiently carried out, so that the catalyst deactivation is inhibited, and the activity and long-term stability of the propane dehydrogenation reaction are improved.

The invention belongs to the field of catalysts, and particularly relates to a self-pillared all-silicon molecular sieve supported catalyst as well as a preparation method and application thereof. The catalyst mainly comprises a nanoscale Silicalite-2 molecular sieve rich in silicon hydroxyl defect sites, an active metal component and an auxiliary agent metal component, wherein the carrier presents a self-pillared morphology formed by splicing and assembling rod-like microcrystals with the particle size of 10-40 nm, after the active metal is loaded by rich silicon hydroxyl defect sites on the surface of the carrier, the interaction between the metal and the carrier can be remarkably enhanced, and the obtained highly-dispersed active metal nanoparticles with the particle size of 1-5 nm are obtained. When the catalyst is applied to propane dehydrogenation reaction, the catalyst shows excellent catalytic activity, the propane conversion rate is 41% or above, the propylene selectivity is up to 97% or above, and good stability provides a new technical approach for developing a propane dehydrogenation fixed bed process which is low in operation cost, low in energy consumption and free of frequent regeneration.

The invention relates to a method for producing styrene, starting from ethylbenzene, the method in particular involving the process of transferring heat from the obtained product gas flow to an H2O-containing flow. It has been found that the present method for producing styrene allows the heat required to carry out the dehydrogenation reaction to be efficiently recycled, in particular in order to heat the H2O-containing input flow being used.

The invention is applicable to the technical field of dehydrogenation reactors, and provides a dehydrogenation reactor with embedded fixed type small overflow weir tower plates, which comprises a reactor shell, an organic liquid discharge pipe is arranged at the bottom of the reactor shell, and an organic liquid inlet pipe and a hydrogen pipe are arranged at the top of the reactor shell; the reactor shell is internally provided with a heat-conducting oil pipeline, the side wall of the reactor shell is internally provided with a plurality of sliding grooves, the sliding grooves are connected with fixing grooves, the reactor shell is internally provided with a plurality of overflow weir tower plates, the outer side walls of the overflow weir tower plates are provided with fixing convex seats, and the overflow weir tower plates are provided with overflow hole channels. According to the device, reaction backmixing is effectively inhibited through unique overflow weir tower plate layout and a fixed structure, modularized convenient replacement of a catalyst is realized, efficient gas-liquid separation in the reaction process is promoted, and the device has the advantages of high dehydrogenation efficiency, low operation and maintenance cost, good operation flexibility and the like.