3169 results about "Dehydrogenation" patented technology

The invention provides tail gas purification treatment equipment and method for a propane dehydrogenation device, and relates to the technical field of tail gas treatment. The equipment comprises a purification mounting part, and a rotary switching part is mounted on the purification mounting part; two filtering devices are mounted on the rotary switching part; the rotary switching part is used for driving the two filtering devices to rotate in the purification mounting piece; a sliding limiting part is mounted on the purification mounting piece; the sliding limiting part is attached to the filtering device below the sliding limiting part; a worker can conveniently check the corrosion condition of the filter cartridge, the filter cartridge can be prevented from being corroded and damaged to influence the filtering effect, meanwhile, the filter cartridge does not need to be disassembled, the continuous purification effect is guaranteed, and the worker can conveniently inspect and observe; the problems that according to existing propane dehydrogenation device tail gas purification treatment equipment, rust and other impurities are generated, the purification effect is affected, and the filtering performance of the filter cartridge is easily reduced are solved.

The invention discloses an oxide nanoparticle synergistic carbon-coated NiZn composite catalyst as well as a preparation method and application thereof. According to the technical scheme, the preparation method comprises the following steps: 1, dissolving nickel salt, zinc salt, nanoscale TiO2 and C6H8O7. H2O in deionized water, and continuously and uniformly stirring to form a colloidal solution; 2, stirring the colloidal solution prepared in the step 1 at 60-100 DEG C for 8-12 hours, and then drying to obtain a light green precursor; and step 3, calcining the precursor prepared in the step 2 in a nitrogen atmosphere at 400-600 DEG C for 1-3 hours to obtain the oxide nanoparticle synergistic carbon-coated NiZn composite catalyst. The catalyst catalyzes coupling of low-carbon alcohol to synthesize higher alcohol, so that the problem of mass transfer blockage caused by deep dehydrogenation of small-molecular alcohol in the process of preparing higher alcohol through bioethanol conversion is solved, and the product yield is increased; belongs to the technical field of catalysts.

According to the Pt cluster catalyst, the preparation method and the application, an aluminum oxide composite metal oxide carrier is prepared by adopting a pH swing method, a defect oxide nano island is formed through high-temperature reduction treatment, and oxygen vacancies contained on the surface can firmly anchor a subsequently loaded Pt cluster, so that the coking phenomenon of the Pt-based catalyst is reduced, and the catalytic activity of the Pt-based catalyst is improved. The catalytic activity and the stability of the Pt cluster catalyst are obviously improved. Meanwhile, Pt clusters are prepared through a heating reflux method, so that the Pt clusters have high dispersity and rich active sites, the finally prepared Pt cluster catalyst is small in Pt particle size and high in atom utilization rate, and when the Pt cluster catalyst is used for catalyzing a dehydrogenation reaction of a liquid organic hydrogen carrier, the Pt cluster catalyst is weak in adsorption capacity to a product, and the catalytic activity of the liquid organic hydrogen carrier is improved. The catalyst can show high conversion rate and hydrogen release rate at low temperature, can still keep stable structure at high temperature, and provides an efficient and reliable solution for engineering application of an LOHC dehydrogenation link.

Provided is a method for preparing N-alkyl carbazole. The method comprises: with diphenylamine and an alkyl alcohol as raw materials, reacting same in the presence of a catalyst A to prepare N-alkyldiphenylamine, and then in the presence of a catalyst B and hydrogen, subjecting the N-alkyldiphenylamine to coupled dehydrogenation to prepare N-alkyl carbazole. Further provided is the use of a catalyst composition containing the catalyst A and the catalyst B for catalyzing a reaction of diphenylamine with an alkyl alcohol to prepare N-alkyl carbazole. In the present application, an alkyl alcohol is used as an alkylation reagent; the raw materials are easily available and inexpensive; few byproducts are produced and are easy to treat; the raw materials and products do not pollute the environment; and the used catalyst A and catalyst B are both heterogeneous catalysts, have good selectivity and high yield, are easy to separate, and can realize continuous production. The preparation method of the present application can achieve coproduction of carbazole, and solves the problem of carbazole having limited sources, low purity and a high price in the prior art.

The invention belongs to the technical field of chemical production, and particularly relates to an efficient energy-saving refining system for producing cyclohexanone through dehydrogenation, which comprises an alcohol tower, a dehydrogenation heat exchanger, a dehydrogenation reactor, an alcohol tower feeding heat exchanger, a dehydrating tower, a light tower I, a light tower II, a ketone tower and an alcohol recovery tower which are connected in sequence, a middle feeding port of the alcohol tower is communicated with a tube pass discharging port of the alcohol tower feeding heat exchanger, a top discharging port of the alcohol tower is communicated with a tube pass feeding port of the dehydrogenation heat exchanger, a bottom discharging port of the alcohol tower is communicated with a middle feeding port of the alcohol recovery tower, and an alcohol ketone drying tower is additionally arranged between the alcohol tower feeding heat exchanger and the dehydration tower. A feed port of the alcohol ketone drying tower is communicated with a shell pass discharge port of the alcohol tower feed heat exchanger, and a liquid phase discharge port of the alcohol ketone drying tower is communicated with an upper feed port of the dehydrating tower. The alcohol tower adopts a process that raw materials directly enter the tower top, tower top reflux is cancelled, steam consumption is reduced, and the purpose of saving energy is achieved.

The invention is suitable for the technical field of solid hydrogen storage, and provides a preparation method and application of a PCN-doped MOF derived nano-porous hydrogen storage composite material. The preparation method comprises the following steps: firstly, synthesizing a cobalt-nickel bimetallic MOF material, and introducing melamine polyphosphate and pentaerythritol ester in the synthesis process; introducing metal vanadium ions to obtain an MOF derivative, and calcining the MOF derivative to obtain the PCN-doped MOF derivative nano-porous hydrogen storage material. And compounding with magnesium hydride to obtain the V-Ni-Co / PCN + MgH2 hydrogen storage composite material. The hydrogen storage capacity of the prepared material reaches 7.0 wt% or above, rapid hydrogen absorption can be started at 40 DEG C, the dehydrogenation starting temperature is reduced to about 150 DEG C, rapid hydrogen absorption / hydrogen desorption is completed within 30 min and 45 min respectively, and excellent hydrogen storage thermal / dynamic performance is shown; after 100 times of hydrogen absorption and desorption cycles, the hydrogen storage capacity retention rate of the material is as high as 97%, and the material shows excellent cycle stability.

The invention relates to the technical field of hydrogen storage and release, and discloses a cyclic hydrogen storage and release system based on aromatic cycloalkane reaction, which comprises a hydrogenation reaction unit, a dehydrogenation reaction unit, a gas-liquid separation and compression unit and an adsorption and purification unit which are sequentially connected through pipelines, the hydrogenation reaction unit, the dehydrogenation reaction unit and the gas-liquid separation and compression unit are respectively connected with the heat exchange unit; the hydrogen storage function and the hydrogen desorption function are integrally designed, the microwave heat supply dehydrogenation reactor is designed for the dehydrogenation reaction link with high energy consumption, and compared with the prior art, the microwave heat supply dehydrogenation reactor has the advantages that the heat transfer resistance is reduced, the reaction efficiency is improved, and the energy loss is reduced. The designed gas-liquid separation and adsorption purification technology is coupled, only one compressor is used in the whole process, the purification process is effectively simplified, the operation is simple and convenient, the equipment cost and the hydrogen purification cost are reduced, and the hydrogen yield and the hydrogen storage carrier cyclic utilization rate are improved. The system has the advantages of high hydrogen storage and release efficiency, small system size, high mobility and the like.

The invention discloses an electrolytic hydrogen production device and method for reducing the hydrogen content in oxygen. The electrolytic hydrogen production device comprises an alkaline electrolytic bath, an enhanced removal pipeline accessory, an anode side gas-liquid separator, an anode side gas treatment device, a cathode side gas-liquid separator, a cathode side gas treatment device, an enhanced removal device, an alkali liquor tank and an alkali liquor circulating pump. The enhanced removal pipeline accessory is arranged on a pipeline between the alkaline electrolytic bath and the anode side gas-liquid separator, and the enhanced removal device is arranged in front of the alkaline liquor tank. According to the invention, the gas-liquid mixed solution on the anode side is primarily dehydrogenated by using the enhanced removal pipeline accessory, the circulating alkali solution is deeply dehydrogenated by using the enhanced removal device, and the hydrogen concentration in oxygen in the water electrolysis hydrogen production system is reduced by reducing the content of dissolved hydrogen in the circulating alkali solution, so that the safety of the system is improved.

A device for preparing chemicals through waste plastic and crude oil mixed feeding grading gas-phase dehydrogenation cracking is composed of a waste plastic self-hot-melting dechlorination pretreatment subsystem, a waste plastic melting liquid and crude oil selective vaporization dehydrogenation cracking subsystem, a high-temperature cracked oil gas gas-phase catalytic cracking subsystem and a cracked oil gas fractionation and refining subsystem. A recycle oil pipeline and a cracking dry gas pipeline of the cracking oil-gas fractionation and refining subsystem are respectively connected to a high-temperature molten oil inlet and a feeding carrying gas inlet of the waste plastic self-heating melting dechlorination pretreatment subsystem, and a waste plastic molten liquid delivery pipeline of the waste plastic self-heating melting dechlorination pretreatment subsystem is connected to a crude oil feeding pipeline; a waste plastic and crude oil mixed feeding pipeline is connected into the waste plastic molten liquid and crude oil selective vaporization dehydrogenation cracking subsystem through an atomizing nozzle, selective vaporization dehydrogenation cracking and gas-phase catalytic cracking are sequentially completed in a grading mode, and then the cracked oil gas fractionation and refining subsystem produces triene tribenzene, high-temperature recycle oil and cracked dry gas.

Processes for producing linear alkylbenzenes from natural oils incorporating hydrogen and heat integration are described. The processes include recycling at least a portion of the hydrogen stream to the linear selective cracking unit, and heating exchanging the paraffin stream, or the C9 to C14 stream, or the C14+ stream, or the first stream, or the second stream, or combinations thereof with the dehydrogenated stream, or the alkylation effluent stream, or both; or providing heat from deoxygenating the natural oil to the linear selective cracking unit, or the dehydrogenation unit, or the alkylation unit, or combinations thereof, or both.

The invention discloses a method for melt catalysis modification of a bamboo powder / polypropylene composite material and application, and the preparation method of the composite material comprises the following steps: uniformly spraying a composite silane coupling agent water-alcohol solution on the surface of bamboo powder, and drying to obtain modified bamboo powder; polypropylene, silicone master batches (containing 50% of polydimethylsiloxane), the modified bamboo powder and a cobalt acetylacetonate / manganese acetylacetonate catalyst are uniformly mixed in different temperature zones, melt extrusion is performed, and the modified bamboo powder / polydimethylsiloxane / polypropylene composite material is prepared. The alkoxy group of the composite silane coupling agent is hydrolyzed to form silanol, the silanol reacts with the hydroxyl group on the surface of the bamboo powder to form a hydrogen bond, the hydrogen bond is condensed into a covalent bond, meanwhile, the amino group and the imino group in the coupling agent can also form a hydrogen bond with the hydroxyl group, and hydrophobic modification is conducted on the bamboo powder. Polydimethylsiloxane in the silicone master batch and silicon hydroxyl on the surface of the modified bamboo powder are subjected to a dehydrogenation reaction through fusion catalysis, stable chemical bonds are generated, an interface layer is formed, and the effect of enhancing the compatibility between the bamboo powder and polypropylene is achieved.

The invention discloses a pure silicon Beta molecular sieve packaging metal catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a silicon source, a template agent, a ligand, a metal salt and a mineralizer in water, carrying out a crystallization reaction at 120-200 DEG C, and carrying out calcination treatment and reduction treatment on the crystallized solid to obtain the pure silicon Beta molecular sieve packaging metal catalyst. The pure silicon Beta molecular sieve packaged metal catalyst is obtained. The pure silicon twelve-membered ring macroporous Beta molecular sieve encapsulated metal catalyst is prepared through a ligand protection in-situ hydrothermal synthesis strategy, so that the size of a metal nanocluster can be reduced, the high-temperature thermal stability of the metal nanocluster is improved, the adsorption and diffusion processes of guest molecules can be regulated and controlled, and the stability of the metal nanocluster is improved. Furthermore, the catalyst shows excellent catalytic performance when being used for catalyzing a propane dehydrogenation reaction and a methyl cyclohexane dehydrogenation reaction, and efficient and stable propane and methyl cyclohexane dehydrogenation performance is achieved.

The invention belongs to the field of catalyst regeneration, and provides a regeneration method of a platinum-based low-carbon alkane dehydrogenation catalyst, which specifically comprises the following steps of: simultaneously carrying out charking and oxychlorination operations before a deactivated catalyst reaches the highest roasting temperature, and adding agent pouring treatment in the regeneration process, and measures for protecting the dispersity of platinum on the catalyst are added in the reaction heating process of the catalyst and after the application is finished, so that the service life of the catalyst is prolonged. According to the regeneration method, the regeneration step of the deactivated catalyst is simplified, chlorine injection, water injection, vulcanization and other operations are not needed, charking, oxychlorination and different reduction depths caused by different positions of the catalyst are avoided, the performance uniformity of the catalyst and the redispersity of platinum are improved, and the regeneration efficiency is improved. The problems that in an existing regeneration method, the dispersity of active components is low, the number of repeated regeneration times is small, and the performance of the catalyst is reduced are solved, the regenerated catalyst obtained through the regeneration method is not lower than that of a fresh catalyst in the aspects of catalyst conversion rate, selectivity and stability, and the regeneration effect is remarkable.

The invention discloses a method for preparing aviation kerosene (aromatic hydrocarbon components) from biogas. The method comprises the following steps: separating biogas to obtain methane and carbon dioxide, and then carrying out a two-step chemical reaction process. The method comprises the following steps: firstly, carrying out dehydrogenation aromatization on methane to obtain aromatic hydrocarbon mainly containing benzene and hydrogen, and separating methane for circulating dehydrogenation aromatization reaction; then hydrogen and aromatic hydrocarbon are merged into carbon dioxide, and the polysubstituted aromatic hydrocarbon is obtained by coupling methanol synthesis and alkylation reaction of benzene without external source hydrogen. The method provided by the invention avoids the problem of low selectivity of aviation kerosene fraction hydrocarbons in a route of Fischer-Tropsch synthesis after methane and carbon dioxide are converted into synthesis gas. According to the conversion method for highly coupling the reaction processes, a new route for producing sustainable aviation kerosene from biogas is developed.

The present invention provides a method for preparing large-pore spherical alumina, and relates to the technical field of spherical alumina. The preparation method of the present invention comprises the following steps: mixing pseudo-boehmite powder with water to obtain a suspension, adding a peptizing agent for peptization to prepare an aluminum hydroxide sol; adding cross-linking molecules to the aluminum hydroxide sol to form a system to be cross-linked; adding a cross-linking agent to the system to be cross-linked to obtain a sol containing a prepolymer; and subjecting the sol to oil-ammonia column molding, drying and roasting to obtain large-pore spherical alumina. The present invention adopts an oil-ammonia column molding method, which does not require the addition of a pore-expanding agent or new equipment, and the preparation process is simple and does not introduce new impurities, so it is suitable for industrial production. The large-pore spherical alumina prepared by the present invention has a pore volume of up to 0.60cm 3 / g or more, and can be used as a propane dehydrogenation catalyst carrier.

The helium extraction system is used for extracting helium in BOG and comprises a low-temperature rectification device, a catalytic dehydrogenation device, a drying device and a pressure swing adsorption device which are sequentially connected through a pipeline. The low-temperature rectification device can rectify and concentrate helium in BOG, the catalytic dehydrogenation device can catalytically oxidize hydrogen in the BOG and remove the hydrogen in the BOG, the drying device can remove moisture in the BOG, and the pressure swing adsorption device is a normal-temperature pressure swing adsorption device and can separate and purify the helium in the BOG; the low-temperature rectification device comprises a first compressor, a heat exchanger, a rectification tower, a condensation evaporator, a gas-liquid separator and a second compressor, the inlet end of the first compressor can be connected with a BOG gas source, and the first compressor, the rectification tower, the condensation evaporator and the gas-liquid separator are sequentially connected through pipelines; a connecting pipeline between the first compressor and the BOG gas source and a connecting pipeline between the first compressor and the rectifying tower respectively form a circulation loop through the heat exchanger, the second compressor and the condensation evaporator; according to the extraction system, the number of dynamic equipment and static equipment in an existing device for extracting helium from BOG is reduced, the input cost is reduced, and the energy consumption and the operation difficulty are reduced.

The invention provides a dehydrogenation catalyst for preparing an aza-aromatic ring as well as a preparation method and application of the dehydrogenation catalyst, and belongs to the technical field of catalyst preparation. The dehydrogenation catalyst comprises a carrier with specific physical parameters, a first active metal component Pd, at least one of a second active metal component Re, Sn or Ir, and a P-containing active auxiliary agent. The dehydrogenation catalyst provided by the invention can be used for a dehydrogenation reaction of a nitrogen-containing heterocyclic compound as a raw material, the aza-aromatic ring can be directly obtained, the conversion rate of the raw material is 99% or above, the selectivity of the aza-aromatic ring product is 99% or above, the yield is 98-99%, and the service life of the dehydrogenation catalyst can reach 5500 h or above. The dehydrogenation catalyst can be used for preparing various nitrogen heteroaromatic rings with different carbon atom numbers, and is particularly used for preparing the nitrogen heteroaromatic rings by dehydrogenation of nitrogen-containing heterocyclic ring byproducts in the hexamethylenediamine production process, waste oil raw materials can be turned into wealth, and the waste oil raw materials are converted into fine chemicals with high additional value.

A catalyst and methods for making the catalyst are provided. An exemplary catalyst includes the formula: MoaVbTec-TadOx. In this formula, a is 1.0, b is about 0.01 to about 0.3, c is about 0.01 to about 0.09, d is about 0.01 to about 0.05, and x is the number of oxygen atoms necessary to render the catalyst electronically neutral.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to a thermal auxiliary material for promoting alkane dehydrogenation reaction efficiency and a preparation method and application thereof. The auxiliary material is composed of a heating main body, a heat storage carrier, a stabilizing auxiliary agent and a carrier auxiliary agent. Wherein the component of the heating main body is CuO; the component of the heat storage carrier is CaO-Al2O3 composite oxide; the stabilizing auxiliary agent is one or more of Cr2O3, La2O3, CeO2 and ZrO2; and the carrier auxiliary agent is one or more of MgO, BaO, NiO and Fe2O3. The thermal auxiliary material with high mechanical strength, high heat transfer performance and high stability is synthesized through the steps of coprecipitation reaction, high-temperature hydrothermal reaction, high-temperature calcination, vacuum impregnation, ultrasonic oscillation and the like; when the material is applied to an alkane dehydrogenation olefin preparation device, alkane conversion rate and olefin selectivity can be improved, the service life of a catalyst can be prolonged, and energy consumption of the device can be reduced.

The utility model relates to the technical field of dehydrogenation furnaces, in particular to a mesh belt dehydrogenation furnace for electroplated parts, which comprises a heating furnace body, supporting legs, a heat delivery mechanism, a heating plate and an auxiliary component, the auxiliary assembly comprises a front partition plate, a rear partition plate, an air curtain machine, a driving component and a backflow component. The front partition plate is connected with the heating furnace body and located on one side of the heating furnace body, the rear partition plate is connected with the heating furnace body and located on one side of the heating furnace body, the air curtain machine is fixedly connected with the rear partition plate and located on one side of the rear partition plate, the driving component is connected with the front partition plate, and the backflow component is connected with the heating furnace body. The mutual influence between the heating area and the cooling area can be relieved through the arranged component, and normal and stable dehydrogenation of the electroplated part is guaranteed.

The invention relates to the technical field of solar cells, in particular to copper-based paste, a TOPCon cell and a preparation method of the TOPCon cell. The copper-based slurry includes: copper powder as main powder densified in a sintering process to form a conductive phase; the hydrogen storage material is used for releasing a hydrogen element in the sintering process and locally forming a reducing atmosphere so as to prevent the copper powder from being oxidized; the hydrogen storage material comprises a liquid hydrogen storage material; and the organic carrier provides fluidity and thixotropy for the slurry. Compared with solid hydrogenated metal particles, the liquid hydrogen storage material can be more uniformly dispersed in the copper-based slurry and can coat the copper powder, so that the hydrogen element released from the copper-based slurry is more uniform, and the oxidation of the copper powder can be comprehensively inhibited. Meanwhile, the dehydrogenation amount of the liquid hydrogen storage material is far higher than that of the solid hydrogenated metal particles, the release amount of hydrogen elements can be increased by multiple times under the same mass, and then more sufficient oxidation protection is provided for the copper powder.

The invention provides the application of the non-dehydrogenation after hydrogen decrepitation treatment in the aspect of improving the residual magnetism of the neodymium-iron-boron magnet. The hydrogen content of the high-hydrogen-content coarse powder which is not dehydrogenated after the hydrogen decrepitation treatment is 1500-3500 ppm. According to the method, dehydrogenation treatment is not carried out especially in the hydrogen decrepitation treatment process, and the alloy coarse powder with high hydrogen content is obtained and used for improving the residual magnetism of the neodymium-iron-boron magnet. According to the preparation method of the high-remanence neodymium-iron-boron magnet, the production process is creatively designed and improved, the total amount of rare earth is reduced through formula design, the hydrogen content of coarse powder is increased, the coarse powder is sieved to remove impurities, an antioxidant is added into the coarse powder, and the measures of secondary high-temperature sintering and the like are adopted, so that the high-remanence neodymium-iron-boron magnet is obtained. And finally, the oxygen content of the magnet is reduced, namely, the beta non-ferromagnetic phase is reduced, and meanwhile, the density of the magnet is improved, so that the residual magnetism Br of the neodymium-iron-boron magnet is effectively improved.

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 method and equipment for preparing high-purity electronic-grade hydrogen chloride from hydrogen-rich hydrogen chloride feed gas. The bid invitation comprises the following steps: (1) removing water through a two-stage deep freezer; (2) further removing water through adsorption of an adsorption tower; (3) rectifying: directly discharging gas-phase materials at the top of the tower, namely hydrogen, carbon dioxide and other non-condensable steam, into an alkali washing section; (4) introducing the material into a light component removal tower for further rectification, directly discharging a gas-phase material at the top of the tower, namely hydrogen chloride gas containing C1 and C2, into an alkali washing section, and circulating a material at the bottom of the tower back to the light component removal tower through a dehydrogenation tower; and (5) introducing the material into a heavy component removal tower for further rectification, directly discharging hydrogen chloride liquid containing chlorine and other high-boiling-point impurities in a tower kettle into an alkali washing section, and extracting a vapor phase at the top of the tower to obtain high-purity electronic-grade hydrogen chloride. According to the method, the load of the adsorption tower is reduced, and the treatment capacity per unit time is increased; the method has the advantages of simple process, low energy consumption, high recovery rate, easiness in stable preparation of high-purity electronic-grade hydrogen chloride, and facilitation of improvement of production scale and yield.

A Liquid Organic Hydrogen Carrier (LOHC) dehydrogenation system is described, capable of meeting time-variable hydrogen demands with short dynamics while always ensuring a high degree of dehydrogenation under all operating conditions. The system comprises one or more reactors comprising an LOHC vessel and a recirculation circuit comprising a recirculation pump, a preheater capable of supplying the reaction heat as sensible heat, and a cartridge containing the solid catalyst.

The invention provides a Pt-Sn bimetallic catalyst and a preparation method and application thereof.The preparation method comprises the steps that 1, a Y molecular sieve is placed in a mixed solution of KOH and methyl alcohol, centrifugation and washing are conducted till the Y molecular sieve is neutral after stirring, drying and roasting are conducted, and a non-acid KY molecular sieve is obtained; the silica-alumina ratio of the Y molecular sieve is 3-100; 2) taking the non-acidic KY molecular sieve as a carrier, and loading Sn by adopting an atomic layer deposition technology to obtain a Sn-modified non-acidic KY molecular sieve; and 3) loading Pt by using the Sn-modified non-acidic KY molecular sieve as a carrier and adopting an atomic layer deposition technology to obtain the Pt-Sn bimetallic catalyst. According to the preparation method provided by the invention, spatial distribution of Pt and Sn is accurately regulated and controlled by combining an atomic layer deposition technology, so that the electronic state of Pt species is adjusted, alkane is promoted to be dehydrogenated into an olefin intermediate, and the aromatization catalytic activity and the aromatic hydrocarbon selectivity of alkane are improved.

The invention relates to the technical field of catalysts, in particular to a dehydrogenation catalyst precursor, a dehydrogenation catalyst and a preparation method and application of the dehydrogenation catalyst precursor. According to the dehydrogenation catalyst precursor, a sulfur-modified magnesium-aluminum mixed oxide is used as a carrier, and a Pt metal cluster is used as an active center; wherein the carrier is a mixed-state metal oxide with a layered hydrotalcite structure, a spinel structure and a near-crystalline synergistic structure. A magnesium-aluminum mixed oxide can be prepared by introducing a precursor of alkali metal magnesium into an aluminum oxide precursor, a layered structure or a spinel structure similar to hydrotalcite can be formed by regulating and controlling the calcination temperature, and by combining carrier surface regulation and control modification, the capability of regulating and controlling the interaction between metal and a carrier can be improved, and the performance of the catalyst is improved. Therefore, the active center of the cluster is maintained, and the acid-base property of the surface of the carrier is effectively modulated, so that carbon deposit is reduced, and the activity and stability of the catalyst are improved.

The invention relates to the technical field of chemical catalysis, in particular to a copper-silicon catalyzed cyclohexanol gradient dehydrogenation and hydrogen recycling method which comprises the following steps: step 1, preparing a gradient catalyst, namely carrying out surface hydroxyl regulation pretreatment on porous silica gel, and loading a copper salt solution by adopting a step-by-step impregnation method to form gradient distribution with gradually decreased copper loading capacity from outside to inside, carrying out segmented heating reduction in a reducing atmosphere containing 5vol% of H2 / N2; 2, gradient dehydrogenation reaction process control; and 3, hydrogen in-situ separation and cyclic utilization: separating hydrogen from the reaction outlet gas through a palladium alloy membrane, controlling the pressure difference of the two sides of the membrane to maintain the permeation flux, returning the separated hydrogen to the inlet of the reactor to adjust the hydrogen partial pressure, and storing the residual hydrogen. Through gradient catalyst preparation, accurate reaction process control and efficient hydrogen recovery technologies, the cyclohexanone production efficiency is improved, and long-term stability of the catalyst and efficient recycling of hydrogen are achieved.

The invention discloses a high-porosity organic salt framework confinement nano-metal hydrogen storage material and a preparation method thereof, and belongs to the field of new energy materials. The material takes a carboxylic acid organic salt framework (POS-1) as a carrier, the specific surface area of the material is 1520 m < 2 > / g, the pore size distribution is 1.8-2.5 nm, nano Mg / Ni particles (the average particle size is 3.2 + / -0.5 nm) are confined in pores through a gradient loading and in-situ reduction technology, and an atomic layer deposition (ALD) is adopted to modify a Pd nano catalyst (the loading capacity is 0.48 wt%). The reversible hydrogen storage capacity of the material at room temperature reaches 5.8 wt%, the hydrogen desorption temperature is lower than 80 DEG C, and the capacity retention ratio is larger than or equal to 92% after 100 times of circulation. The preparation method comprises the steps of organic salt framework synthesis, metal precursor gradient loading, low-temperature reduction (250 DEG C), hydrogenation activation and the like, the process is simple and controllable, and the catalyst is suitable for scenes such as a vehicle-mounted hydrogen storage system.

The invention discloses a catalyst for preparing gamma-butyrolactone through liquid phase dehydrogenation of 1, 4-butanediol as well as a preparation method and application of the catalyst. Belongs to the technical field of catalyst preparation. The catalyst is composed of a carrier, CuO and MOx, the CuO and the MOx are loaded on the carrier, Cu accounts for 10-50% of the total mass of the catalyst, M accounts for 1-25% of the total mass of the catalyst, M is one of Mn, Zn, Co, Ni, Fe, Cr, Ce, Nb, Ru, Pt, Ir and Pd, and the carrier is one of silicon oxide, aluminum oxide, magnesium oxide, lanthanum oxide, hydroxyapatite and magnesium-aluminum hydrotalcite. An oxide-oxide interface is formed between CuO and MOx through roasting and reduction, and relatively strong electron interaction exists between highly dispersed Cu nanoparticles and the oxide-oxide interface, so that the stability of the catalyst can be enhanced.