94 results about "Efficient catalyst" patented technology

The invention discloses tetragonal system germanium dioxide and a hydrothermal synthesis method thereof. According to the method, hexagonal crystal system germanium dioxide is taken as a raw material, a hydrothermal reaction is carried out in an acidic aqueous solution, and efficient conversion from a hexagonal crystal system to a tetragonal crystal system is realized by controlling the reaction temperature to be 120-240 DEG C, the reaction time to be 24-48 hours and the pH value to be 1-3. According to the preferable scheme, the raw materials are subjected to calcination pretreatment at the temperature of 500-600 DEG C, the yield of the tetragonal crystal phase can be remarkably increased, and the synthesis temperature can be reduced to 120 DEG C. According to the invention, stable synthesis of tetragonal system germanium dioxide is realized for the first time under the mild condition of 240 DEG C and below, and the technical problem that high-temperature transformation at 1000 DEG C or above is needed in the traditional method is solved. The tetragonal crystal system germanium dioxide prepared by the method is of a regular polyhedral structure, has the particle size of 400-500nm, and can be used as a high-efficiency catalyst for polyester synthesis. The process is energy-saving and environment-friendly, the total utilization rate of the raw materials is increased by recycling the waste liquid, and the process has remarkable industrial application value.

The invention relates to the technical field of high polymer material recovery, in particular to a composite catalyst for preparing DMT through PET alcoholysis and a preparation method and application of the composite catalyst. The composite catalyst comprises a solid acid material which is obtained by carrying out proton transfer reaction on silica gel of which the surface is grafted with aluminum alkyl and perfluoroalkyl sulfonic acid of which the general formula is Rf-SO3H, wherein Rf is a perfluoroalkyl group with the carbon atom number of 1-10. Through the synergistic effect of the components, the composite catalyst shows excellent performance in the process of degrading PET (Polyethylene Terephthalate) by monohydric alcohol. When methanol is used as an alcoholysis agent, the yield of the main product dimethyl terephthalate (DMT) can reach 95% or above, the catalytic efficiency is high, the stability is good, an efficient catalyst is provided for industrialization of chemical recovery of PET, and the method has important economic and environmental values.

The application discloses a method for producing formaldehyde at low temperature, and belongs to the technical field of formaldehyde production. The method comprises the following steps: preparing a high-efficiency catalyst by taking iron nitrate nonahydrate, ammonium molybdate tetrahydrate and lithium hydride as raw materials; feeding mixed gas of methanol and air into a reactor filled with the high-efficiency catalyst under the condition that the temperature is 250-280 DEG C; and collecting gas at the outlet of the reactor to complete the method for producing formaldehyde at low temperature. The embedding of lithium can expand the crystal lattices of the catalytic products, thereby generating a large number of oxygen vacancies, enhancing the electron-donating capacity, and enabling the adsorption of p-formaldehyde to be quickly dissociated and the active sites to be quickly reduced at a relatively low temperature, so that the activity of subsequent catalysis is ensured. The plasma treatment can increase the surface area and the number of active sites of the high-efficiency catalyst, and further improve the catalytic activity. The method for producing formaldehyde at low temperature can improve the conversion rate of methanol and the yield of formaldehyde at a relatively low temperature, and is helpful to reduce energy consumption and reduce the volatilization of Mo.

This application relates to the field of hydrosilylation, and in particular to a highly efficient catalyst for hydrosilylation reactions and its preparation method. This application provides a method for preparing a microcapsule-form catalyst, which first modifies methyl-terminated hydroxyl silicone oil with silazane, and then forms a microcapsule coating system with paraffin, thereby improving the release performance of the microcapsule coating system, so that the catalyst has low reactivity in the early stage of release, thereby improving the uniformity of the reaction process inside the silicone rubber, and thus improving the transparency and overall strength of the silicone rubber.

The invention provides a high-valued utilization method and device for residual liquid in a rectifying tower in the production process of 1, 4-cyclohexanedimethanol, and relates to the technical field of by-product purification, and the method comprises the following steps: adding residual liquid in a CHDM rectifying tower, a catalyst and methanol into a methanol alcoholysis tank for alcoholysis reaction; introducing the alcoholysis solution into a scraper evaporator for distillation separation, and conveying a product into a gas-liquid separation tank to obtain an alcoholysis concentrated solution; and introducing the alcoholysis concentrated solution into an alcoholysis solution recovery tower for vacuum rectification, and condensing to obtain a crude product CHDM. According to the method, a methanol alcoholysis process is innovatively adopted, the CHDM rectifying tower kettle residual liquid is efficiently converted into high-value products such as CHDM, MHMCC and DMCD, and the products can be directly recycled to an existing CHDM rectifying system; through a designed methanol and tower kettle residual liquid recycling system, efficient utilization of raw materials and emission reduction of wastes are realized; a high-efficiency catalyst is adopted, so that conversion can be realized under mild conditions; and the catalyst can be used together with a device, and can be directly connected to the existing CHDM rectification device without modifying the original device.

The invention relates to the technical field of brine sewage treatment, and discloses an inferior brine refining preparation method based on oxidation-adsorption coupling, which comprises the following steps: adding an efficient CuO / Al2O3 catalyst according to 0.5-1.5% of the volume of brine under the accurate control of the pH value of 2.5-3.0, and adding sodium chlorite according to the molar ratio of 3: 1-5: 1 to realize the specific deep oxidation of I <->; and carrying out targeted enrichment on the generated I2 by using a high-capacity adsorbent. According to the combined process, the iodine concentration of effluent is stably lower than 0.1 mg / L, and the catalyst can be recycled for more than or equal to 50 times. Comparison data proves that the iodine residue is up to 0.85 mg / L when no catalyst exists, and iodine removal is not thorough due to the fact that the oxidizing agent is insufficient. According to the efficient iodine removal method, the deposition of iodine in the ionic membrane electrolytic bath is fundamentally avoided, the expensive ionic membrane is effectively protected, the service life of the ionic membrane is prolonged by more than 30%, the energy consumption of the system is reduced by about 15%, and the brine recycling efficiency and the economic benefit are remarkably improved.

The invention discloses a catalyst combination method for simultaneously removing CO and NOx in flue gas, which is characterized in that two reaction systems are arranged in a flue gas purification device, the flue gas enters the flue gas purification device, ammonia spraying operation is carried out, oxidation reaction is carried out on the upper layer of the flue gas purification device, and CO in the flue gas is oxidized into CO2 and part of NO is oxidized into NO2 under the catalytic action of an oxidation catalyst Co1-xNix / Al2O3; according to the method, CO and NOx in the flue gas are removed at the same time, NH3-SCR reaction is carried out on the lower layer of the flue gas purification device, and under the catalytic action of a NOx selective reduction catalyst, blown ammonia gas and NOx in the flue gas are converted into N2 and H2O, so that CO and NOx in the flue gas are removed at the same time. The flue gas purification device is utilized to realize efficient and synergistic removal of CO and NOx, and has the characteristics of high efficiency, simple catalyst preparation, convenience in engineering application and the like.

The invention discloses an MIL-125-NH2 encapsulated CuO composite material as well as a preparation method and application thereof in photocatalytic urea synthesis, and belongs to the technical field of photocatalytic materials. MIL-125-NH2 is used as a carrier, the ultrafine CuO nanocluster is encapsulated in a pore channel of the carrier in a precise confinement manner and is recorded as xCuO at MN, and x is the mass percent of CuO and is 1.3-4.0%. According to the composite material, CuO nanocluster atomic-scale dispersion is achieved through dual-induction confinement, the separation efficiency of photon-generated carriers is greatly improved through strong electron interaction between a subject and an object, the yield of 3.5 CuO at MN for catalyzing CO2 and N2 to synthesize urea under the conditions of normal temperature, normal pressure and visible light reaches 149 micromoles g <-1 > h <-1 >, the structural stability is excellent, and the preparation process is simple. The composite material is also applied to photocatalytic urea synthesis, the reaction takes visible light as an energy source and an aqueous solution as a system, high temperature and high pressure are not needed, the composite material is green and environment-friendly, and a high-efficiency catalyst and technical support are provided for industrial application of photocatalytic urea synthesis.

The invention relates to a compound catalyst for a cyanate ester resin system and the cyanate ester resin system. The compound catalyst comprises a compound containing amine and phenol structures and a transition metal compound. The catalyst has the advantages of few types of required raw materials, simple preparation, health, environmental protection, low addition amount and high catalytic efficiency. The cyanate ester resin system is prepared by mixing cyanate ester resin, a flexibilizer and a high-efficiency catalyst according to a certain ratio and a process. By using the catalyst, the curing reaction of the cyanate ester resin system is completed under the condition of medium and low temperature curing, and the excellent heat resistance of the cyanate ester resin is still maintained. The cyanate ester resin system has the advantages that the curing temperature is obviously reduced to be less than or equal to 170 DEG C, the curing time is 2-6 hours, and the Tg of a cured product is more than or equal to 250 DEG C. The cyanate ester resin system can be widely applied to the fields of aerospace, military industry and the like, such as projectile body transparent thin covers, radomes, satellite cell panels, space bearing structures and the like.

This invention relates to a composite catalyst containing phenolic hydroxyl and imidazole structures, and a cyanate ester resin system. The catalyst system of this invention comprises compounds containing imidazole and phenolic structures, along with transition metal compounds. The compounds containing imidazole and phenolic structures serve as the hydrogen source for the active hydrogen catalyst and as the support for the transition metal compound catalyst. The cyanate ester resin system of this invention is prepared by mixing cyanate ester resin, a toughening agent, and a high-efficiency catalyst. By using the catalyst, the curing reaction of the cyanate ester resin system is completed under medium-low temperature curing conditions while maintaining the excellent heat resistance of the cyanate ester resin. This cyanate ester resin system can be widely used in aerospace, military, and other fields such as projectile transparent covers, radar domes, satellite solar panels, and space support structures.

This invention provides a method for synthesizing dimethyl 2,5-furandicarboxylate by oxidative esterification of 2,5-furandiethanol using a cobalt-zinc-based carbon material, belonging to the field of catalytic synthesis technology. This method uses 2,5-furandiethanol as a raw material, molecular oxygen as an oxidant, and a cobalt-zinc-based carbon material as a heterogeneous catalyst to prepare dimethyl 2,5-furandicarboxylate via a one-step oxidative esterification reaction in methanol solvent using high-performance liquid phase. The cobalt-zinc-based material is prepared by mixing a certain amount of cobalt salt, zinc salt, and organic nitrogen-containing compound ligand to obtain a precursor, which is then calcined at 500-1100℃ under an inert atmosphere for 0.5-24 h. The oxidative esterification method provided by this invention is mild and efficient, and the catalyst is inexpensive and readily available, making this method highly practical and applicable.

The invention discloses an aliphatic beta-keto-enamine bond covalent organic framework material based on pyrrolidine catalytic synthesis, the skeleton structure of the covalent organic framework material comprises a beta-keto-enamine bond formed by condensation reaction of 1, 3, 5-trialdehyde phloroglucinol and an aliphatic ammonia monomer, and the preparation method comprises the following steps: adding 1, 3, 5-trialdehyde phloroglucinol and an aliphatic amine monomer into a reaction kettle, and reacting to obtain the covalent organic framework material. The preparation method comprises the following steps: mixing 1, 3, 5-trialdehyde phloroglucinol, an aliphatic ammonia monomer, a solvent and a catalyst for reaction, washing and drying to obtain the covalent organic framework material containing the beta keto-enamine bond. According to the invention, pyrrolidine is adopted as a high-efficiency catalyst and is matched with a green mixed solvent system with specific composition, so that ordered connection of flexible aliphatic ammonia monomers is effectively guided, the problem that low polymers are easy to generate under the catalysis of traditional acetic acid is overcome, and the crystallization quality of the material is remarkably improved.

The invention relates to the field of hydrosilylation, in particular to a high-efficiency catalyst for hydrosilylation and a preparation method thereof, and provides a preparation method of a microcapsule type catalyst, methyl-terminated hydroxyl silicone oil is modified by silazane, and then a microcapsule coating system is formed by the modified methyl-terminated hydroxyl silicone oil and paraffin. The release performance of a microcapsule coating system is improved, so that the catalyst has relatively low reaction activity at the initial release stage, the uniformity of the reaction process in the silicone rubber is improved, and the transparency and the overall strength of the silicone rubber are further improved.

The application discloses a preparation method of a catalyst for synthesizing pyridine from 3-methylpyridine and relates to the technical field of catalysts. The catalyst comprises the following steps: ZSM-5 is used as a carrier, V2O5, CoO and Ag are used as active components, molecular sieve ZSM-5, citric acid, ammonium metavanadate, cobalt nitrate, silver nitrate and deionized water are mixed, and then are filtered, dried and calcined to obtain a supported high-efficiency catalyst; the catalyst is filled in a fixed bed, 50% 3-methylpyridine is used as raw material, and a demethylation reaction is carried out under the action of high temperature, the catalyst and air to produce pyridine. The catalyst used in the application does not need to be frequently activated, the activation frequency is low, the catalyst stability is good, the catalyst is not prone to deactivation, can continue to operate stably after activation, catalyst loss is greatly reduced, 3-methylpyridine can be efficiently converted into pyridine by using the prepared catalyst, and the dilemma of waste caused by small demand for 3-methylpyridine in the market is solved.

The application discloses a test method and equipment for simulating HCs poisoning of a diesel engine aftertreatment catalyst, and the test method is a simple and efficient catalyst poisoning simulation method, which can simulate poisoning conditions of different catalytic devices / systems in different scenes through a small sample form, close to a vehicle use scene, and provide powerful theoretical support for rapid screening of anti-poisoning formula and analysis of poisoning causes. In addition, the test method can more objectively reflect catalyst poisoning conditions in actual operation of the vehicle, and reasonably evaluate the anti-poisoning capability of the catalyst. The test equipment provided by the application can be used for the test method, and the composition and dosage of toxic substances can be conveniently and quickly adjusted, so that the actual working conditions of the catalyst are more objectively and truly reflected, and a basis is provided for performance evaluation of the catalyst.

This invention discloses a catalyst and method for the preparation of 5-methoxy-4,6-dichloropyrimidine via the Krißer reaction, belonging to the field of catalyst technology. The catalyst comprises modified triphenylphosphine, a co-catalyst, a silane coupling agent, and a spherical alumina support. The co-catalyst comprises the following raw materials: lignin, NaOH solution, and K₂S₂O₈ solution. This invention uses modified triphenylphosphine as the core catalytically active component and cleverly utilizes the reaction product of lignin and K₂S₂O₈ under alkaline conditions as an auxiliary catalyst. Through the mediation of the silane coupling agent, these two raw materials are efficiently composited on a spherical alumina support, thereby preparing a highly efficient catalyst specifically for the Krißer reaction synthesis of 5-methoxy-4,6-dichloropyrimidine. Compared with traditional techniques, this invention significantly improves the yield, achieving a leap in production volume. More importantly, this invention greatly accelerates the production process and improves overall production efficiency.

The application discloses a kind of by density functional theory reveals the calculation method of micro-mechanism and selectivity source of palladium catalysis olefin amine 1,2-diarylation reaction, belong to the intersection technical field of organic synthesis and computational chemistry. Including constructing molecular structure;The configuration optimization and calculation are carried out to molecular structure, obtain thermodynamic data;The geometric configuration of intermediate and transition state in each step is calculated, the change of gibbs free energy is obtained, the connection relationship of transition state and corresponding reactant, product is determined;According to thermodynamic data and connection relationship, reaction path diagram is drawn, and reaction mechanism is determined;According to reaction mechanism, the step of determining the selectivity of reaction region, enantioselectivity and chemical selectivity is determined, and selectivity control strategy is analyzed and output. By simulation, the key intermediate and transition state structure of each element step of reaction is determined, the reaction energy barrier of each element step is quantified, the transition state action mechanism determining the selectivity of reaction region, enantioselectivity and chemical selectivity is analyzed in depth, to provide theoretical guidance for the design of high-efficiency catalyst and the optimization of reaction condition.

The application relates to a preparation method of an iron-molybdenum bimetallic MOF derived catalyst and application of the iron-molybdenum bimetallic MOF derived catalyst in treatment of refractory organic wastewater by activated persulfate. The application is based on a transition metal activated persulfate (PDS) advanced oxidation process, and a magnetic recyclable iron-molybdenum bimetallic composite catalyst (Fe / Mo@C) is successfully prepared by a co-precipitation and calcination method. The Fe / Mo@C is a porous nanomaterial, has rich surface active sites, a large specific surface area, a simple synthesis process, superior performance, a wide pH action range, and has a good application prospect. In the present study, bisphenol A (BPA) is selected as a target pollutant, and the composite catalyst shows high reaction activity in removal of BPA, and 20mg / L BPA can be rapidly removed within 10min. The excellent performance is due to the synergistic effect of the molybdenum-iron bimetallic material, which accelerates Fe(II) / Fe(III), Mo(IV) / Mo(VI) double circulation, accelerates generation of SO4 · And ·OH by activation of PDS to rapidly further attack and decompose organic pollutants. The application provides a new idea for preparation of a new efficient catalyst and treatment of refractory organic pollutants by activated persulfate.

This invention discloses a highly efficient method for synthesizing cyanuric acid in the field of green chemistry and chemical engineering. The method uses urea as a raw material and reacts it in a decahydronaphthalene solvent under the catalysis of a phosphotungstic acid-confined three-dimensional ordered macroporous alumina solid acid catalyst. Specifically, urea, solvent, and catalyst are mixed and heated under nitrogen protection. After cooling, filtration, and solvent washing, the resulting filter cake is separated from the crude product by stirring with hot water. The separated catalyst is dried and can be recycled. The filtrate containing the product is cooled, crystallized, filtered, washed, and dried to obtain high-purity cyanuric acid. The catalyst used in this method is prepared using a template method and confinement technology, exhibiting a stable structure and significantly inhibiting the loss of active components. This invention features a simple and efficient process, easy catalyst recovery and recycling, and high product yield and purity, demonstrating promising prospects for industrial application.

The invention belongs to the field of catalytic materials, and particularly discloses a high-stability nanogold-loaded molecular sieve catalyst for catalyzing methane selective oxidation. The catalyst is prepared by a two-step synthesis method. The method comprises the following steps: recrystallizing an MFI structure molecular sieve carrier, centrifuging, washing, drying and calcining to obtain the modified molecular sieve. Then mixing a chloroauric acid solution with the modified molecular sieve carrier, adjusting a certain pH value, stirring and aging for a certain time at a proper water bath temperature, and then filtering, washing, drying and calcining to obtain the catalyst. The catalyst can realize direct oxidation of methane into methanol and acetic acid by oxygen, has high stability, and can still maintain catalytic activity under long-time reaction and multiple catalytic reaction cycle test conditions. The preparation method of the catalyst is simple in process, and a thought is provided for design of a high-efficiency catalyst in methane oxidation reaction.

The invention relates to a method for preparing gold and gold-based nano materials with hexagonal close packing (2H) phases or with 2H phases as main components, which can realize regulation and control of size, morphology and components of products without template support. The synthesized 2H-phase gold and gold-based nano material can be used as a high-efficiency catalyst for an electrochemical carbon dioxide reduction reaction, and still has excellent catalytic performance under the conditions of low carbon dioxide concentration and low reduction potential. Under the conditions of a wide potential range and a low-concentration carbon dioxide raw material, the 2H-phase gold-based nano material shows high catalytic activity, selectivity, energy conversion efficiency and excellent long-term stability on a carbon monoxide product, and shows wide application potential in related technologies of carbon dioxide conversion. Compared with a 3C-phase material, the 2H-phase gold nanomaterial has unique optical characteristics. The service life (about 2,000 ps) of plasmon hot carriers in the 2H-phase gold square nanosheets is far longer than that of 3C-phase gold square nanosheets (about 10 ps), and it is indicated that the 2H-phase gold square nanosheets are possibly photoelectric functional materials with application prospects.

The utility model relates to the technical field of environmental protection equipment, and discloses an energy-saving ammonia gas collecting and treating device which comprises a gas collecting hood, a gas guide pipe is fixedly mounted on the right side surface of the gas collecting hood, and a fan is fixedly mounted at the right end of the gas guide pipe. According to the energy-saving ammonia gas collecting and treating device, by arranging the multi-stage filter, the energy-saving reactor and other components, the gas collecting hood covers an ammonia gas source, ammonia gas enters the multi-stage filter through the gas guide pipe, the fan and the first connecting pipe, preliminary adsorption is achieved through the molecular sieve layer and the activated carbon layer, and remaining ammonia gas enters the energy-saving reactor; the ammonia gas is decomposed into nitrogen and water under the action of a high-efficiency catalyst, the treated gas is conveyed into a purification module through a connecting pipeline, residual pollutants are further removed, it is ensured that emission reaches the standard, and through the synergistic effect of a multi-stage filter and an energy-saving reactor, the treatment efficiency of the ammonia gas is remarkably improved, and meanwhile energy consumption is reduced. A gas component sensor is installed in the exhaust pipe, gas is detected in real time, and it is ensured that the exhausted gas reaches the standard.

The invention discloses a multi-algorithm fused toluene catalytic combustion catalyst rapid screening method, and relates to the field of catalytic materials.The method comprises the specific steps that literatures containing single metal-metal oxide catalysts are collected, and data are extracted and processed to form a standardized data set; constructing a multi-dimensional feature system, and determining a target variable; 11 models are selected, data sets are divided, and parameters are optimized; screening an optimal model according to error indexes, and mining key features and association rules; inputting to-be-screened catalyst parameters into the model for prediction, judging by combining conditions, and determining the to-be-screened catalyst parameters as high-performance candidates if the to-be-screened catalyst parameters are greater than By constructing a multi-dimensional feature set, fusing material characteristics, preparation parameters and other core elements and selecting multiple models for training and optimization, the methylbenzene conversion rate prediction accuracy is improved, the optimal model is combined with physical constraints, efficient catalyst screening is achieved, the research and development period is shortened, resource waste is reduced, and a new path is provided for catalyst research and development.

This invention belongs to the field of environmental engineering and electrocatalyst technology, and discloses a highly efficient catalyst for the electrocatalytic co-reduction of carbon dioxide and nitrate to urea, its preparation method, and its application. The catalyst is a Zn / MoO₂ catalyst. x -CNT composite catalyst, composed of carbon nanotubes supported on molybdenum oxide and zinc nanostructures supported on carbon paper, possesses the properties of Zn and MoO. x Heterogeneous interfaces, in which MoO x The catalyst is composed of molybdenum oxide, zinc nanoparticles, and carbon nanotubes as a support providing conductivity and structural stability. This invention constructs a heterojunction system and employs an electrochemical wet process to create a catalyst with numerous heterojunction interfaces. Through interfacial effects, it enhances electron transfer, regulation, and surface adsorption, effectively improving the efficiency and yield of the co-reduction of carbon dioxide and nitrate to urea. The preparation method is simple, easy to synthesize, uses inexpensive and readily available raw materials, and is easily scaled up, showing promising application prospects.

The invention relates to the technical field of novel efficient catalyst preparation and pollutant degradation, in particular to an h-Co3O4-coated CoMn-LDH catalyst of a hollow core-shell tubular structure and a preparation method and application of the h-Co3O4-coated CoMn-LDH catalyst. The composite catalyst comprises a hollow h-Co3O4 tube and a CoMn-LDH ultrathin nanosheet formed on the surface of the hollow tube through in-situ growth, so that the bimetal-based hollow core-shell structure composite catalyst with high specific surface area and high dispersion active sites is formed. The persulfate can be more efficiently and stably activated to generate active oxygen species so as to degrade organic pollutants.

The invention discloses a method for precisely designing and efficiently screening a diatomic catalyst based on MXenes and applying the diatomic catalyst to CO2RR. The method comprises the following steps: 1, primarily selecting a carrier; 2, constructing a model; 3, screening an electronic structure; 4, evaluating the stability; 5, catalytic activity screening; and 6, selective screening. According to the invention, a diatom combination adapted to MXenes is screened out by combining first principle calculation with high-throughput screening, a stable MXene-based diatom catalyst model is screened out through electron local function analysis and formation energy and binding energy calculation, the thermodynamic stability of the catalyst is verified through molecular dynamics, and the research on catalytic activity shows that the rate limiting step of Pd2-Mo2CO2 catalytic NRR is as low as 0.23 eV, and the rate limiting step of Pd2-Mo2CO2 catalytic NRR is as low as 0.23 eV. The overpotential of the Au2-Ti2CO2 for catalyzing CO2RR to generate ethanol is only 0.6 V, the performance of the Au2-Ti2CO2 is better than that of a traditional catalyst, and the method provides an efficient catalyst design normal form for electrochemical energy conversion.

The invention provides an efficient catalyst system for methyl cyclohexane dehydrogenation reaction and a preparation method of the efficient catalyst system, and the preparation method comprises the following steps: pretreating a carrier through anions, and loading platinum group metal by adopting a deposition-precipitation method to prepare a dehydrogenation catalyst with a stable structure and high activity. According to the invention, the comprehensive improvement of the dehydrogenation catalyst in the aspects of activity, stability and carbon deposition resistance is realized. The prepared catalyst can keep high activity for a long time in MCH dehydrogenation reaction, the problem that high metal utilization rate, high activity and high stability cannot be achieved at the same time can be effectively solved, the service life of the catalyst is remarkably prolonged, the operation cost and energy consumption caused by frequent regeneration or replacement are reduced, and after a stability test at the temperature of 300 DEG C for 45 h, the stability of the catalyst is greatly improved. And the activity is still kept above 40%.

The application provides a method for synthesizing allyl tertiary amine, which can selectively synthesize allyl tertiary amine from alkyl secondary amine through allyl amination with high efficiency. The application uses metal-phosphine complex as a homogeneous catalyst, and simultaneously adds a cocatalyst ketoxime to selectively catalyze the cleavage of the primary allyl C-H bond of olefin to synthesize allyl amine. The method can be extended to a wide range of olefins, has atom economy, makes the synthesis of allyl tertiary amine compounds simpler and more efficient, the catalyst can be recycled, and excellent chemical region selectivity and functional group tolerance are exhibited.

This invention discloses a composite Li-Ca-Ce-LSX hydrophobic molecular sieve, its preparation method, and its applications. The method further modifies Li-LSX molecular sieves with Ca and Ce, synthesizing the composite Li-Ca-Ce-LSX hydrophobic molecular sieve via an aqueous solution exchange method. The preparation method of this invention is simple, and the obtained composite Li-Ca-Ce-LSX hydrophobic molecular sieve has a particle size of 0.2~0.4 mm, exhibits good crystallinity and adsorption performance, high polarizability, high adsorption capacity for nitrogen and nitrogen-oxygen separation coefficient, and a certain degree of hydrophobicity. This significantly improves the molecular sieve's environmental sensitivity and extends its service life. It can be used as a high-efficiency catalyst, heavy metal ion adsorbent, and concrete additive, with a wide range of applications.

The present application provides a method for purifying triethylamine by reactive distillation. The method is: carrying out reactive distillation of crude triethylamine with a reactive entrainer and a catalyst in a reactive distillation column; the reactive entrainer is selected from a compound containing a labile carbonyl group and / or a compound containing a sulfonyl group, and the catalyst is selected from an azaheterocyclic compound and / or an organic amine compound. In the present application, one molecule of the reactive entrainer can react with four molecules of various impurities, and the high-efficiency catalyst greatly improves the impurity removal efficiency. At the same time, the high-efficiency continuous reactive distillation can solve the high energy consumption problem caused by the need for distillation to recover the extractant in the traditional extractive distillation purification.