502 results about "Homogeneous catalysis" patented technology

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The present invention relates to the technical field of polymer preparation. Disclosed are a covalent organic framework material, and a preparation method therefor and a use thereof. The preparation method for the covalent organic framework material comprises the following step: subjecting an organic aldehyde and an organic amine to a condensation reaction in a deep eutectic solvent to obtain the covalent organic framework material, wherein the deep eutectic solvent is a two-component eutectic liquid composed of menthol and acetic acid. The temperature for the reaction is 25-120ºC, and the time for the reaction is 1-72 hours. The deep eutectic solvent composed of menthol and acetic acid used in the present invention has good dissolution properties for organic matters, and can also efficiently catalyze the condensation reaction between the organic amine and the organic aldehyde. The prepared covalent organic framework material exhibits high crystallinity and has good applications in the fields of adsorptive separation, heterogeneous catalysis, energy storage, etc. The present method has mild reaction conditions, simple operation, and good universality, is conducive to industrial large-scale production, and conforms to the concept of green chemistry.

The invention belongs to the technical field of novel material catalysis, and particularly relates to a hollow mesoporous silica supported phosphotungstic acid catalyst and a preparation method and application thereof. According to the invention, the advantages of high specific surface area and regional effect performance of hollow mesoporous silica and the characteristic of adjustable acidity of vacancy heteropolyacid quaternary ammonium salt are innovatively combined, and the cationic surfactant is loaded on the surface of the hollow mesoporous silica, so that the contact surface of raw materials is effectively increased, efficient conversion of reactants is assisted, and the reaction efficiency is improved. The supported catalyst with efficient catalysis and stable performance is obtained. The catalyst can be used for a reaction for preparing glutaraldehyde through heterogeneous catalysis of cyclopentene oxidation, and the reaction condition is mild. Experiments show that under the catalytic system, the cyclopentene conversion rate can reach 90% or above, the glutaraldehyde selectivity is improved to 75% or above, double improvement of the cyclopentene conversion rate and the glutaraldehyde selectivity is successfully achieved, meanwhile, the advantage that the catalyst is easy to separate is achieved, and an efficient solution is provided for industrial application of synthesis of glutaraldehyde through cyclopentene oxidation.

The invention belongs to the technical field of fine chemical engineering, and discloses a synthesis method of a malonate compound, which comprises the following steps: under the action of a heterogeneous catalyst, carrying out hydrolysis-esterification reaction on cyanoacetic acid and alcohol, and after the reaction is finished, carrying out post-treatment to obtain the malonate compound, the heterogeneous catalyst comprises a carrier and an active component; the active component comprises ionic liquid and active metal; the carrier is an ordered mesoporous material; the active metal is alkaline earth metal. According to the method, malonate products can be obtained, the problems of low yield, serious equipment corrosion and large amount of three wastes are solved, efficient synthesis of malonate compounds is realized, meanwhile, the production efficiency is improved, and the environmental pollution is greatly reduced.

The invention relates to the technical field of industrial wastewater treatment, and discloses a treatment method for grinding fluid wastewater of a grinder, which comprises the following steps: pretreatment and demulsification, multi-stage chemical purification, biochemical deep treatment, deep purification and recycling, and sludge treatment. A specific supported heterogeneous catalyst is adopted in the multi-stage chemical purification step, nano zero-valent iron and copper oxide composite active components constructed on the surface of the catalyst can enhance the generation efficiency and stability of free radicals in the advanced oxidation process, and a composite coagulant with an optimized ratio in the coagulating sedimentation step is cooperated, so that the purification efficiency of the high-grade oxidation process is improved. An efficient continuous removal system for heavy metal ions and refractory organic pollutants is formed; meanwhile, in the pretreatment step, the demulsifier is composed of specific components, through the synergistic effect of all the components, rapid demulsification of the emulsified oil phase in the grinding fluid wastewater is achieved, favorable conditions are created for subsequent deep treatment, and therefore the purification efficiency and operation stability of the technology are overall improved.

The invention discloses a surface zinc-loaded molecular sieve catalyst for PET (polyethylene terephthalate) depolymerization and a preparation method of the surface zinc-loaded molecular sieve catalyst. According to the catalyst, a molecular sieve with a framework silica-alumina ratio of 25-400 is adopted as a carrier, and zinc species are strongly loaded on the outer surface of the molecular sieve through chemical bonding. The preparation method comprises the following steps: dissolving a zinc source in water, and adjusting to a specific pH value by using inorganic acid to obtain a zinc-containing solution; dipping a molecular sieve carrier in the solution under a heating condition; and finally, filtering, washing, drying and roasting to obtain a finished product. The catalyst successfully solves the problem that reaction activity and separability of a traditional solid catalyst in PET glycol alcoholysis are difficult to consider at the same time by accurately regulating and controlling active site distribution, shows high activity and excellent cycling stability close to those of a homogeneous catalyst, and has remarkable industrial application potential.

The invention relates to the technical field of catalyst preparation, in particular to a supported TBD-IPTS / SBA-15 catalyst and a preparation method and application thereof.The preparation method comprises the following steps that an SBA-15 carrier is treated with acid liquor, washed to be neutral and then dried, and an activated carrier SBA-15-OH is obtained; the preparation method comprises the following steps: dispersing SBA-15-OH in anhydrous toluene under the protection of nitrogen, adding IPTS (isopropyl-beta-d-thiosulfate) for reflux reaction, and washing and drying after the reaction is finished to obtain IPTS / SBA-15; iPTS / SBA-15 is dispersed in anhydrous dichloromethane, a TBD solution is added for a reaction, washing and drying are performed after the reaction is finished, and a supported TBD-IPTS / SBA-15 catalyst is obtained; the problems that in existing captopril intermediate synthesis, a by-product L-MAT is difficult to utilize, a traditional homogeneous TBD catalyst is difficult to recycle and reuse, and in an existing loading technology, active components are poor in stability and low in catalytic efficiency are solved.

The invention provides a preparation method of a magnetic recoverable catalyst and a method for synthesizing 3-mercaptopropionic acid, and mainly solves the problem that a large amount of acid and alkali solutions are needed in the existing acrylonitrile-sodium hydrosulfide and acrylic acid-thiourea process routes. The thiohydracrylic acid synthesis catalyst is prepared. The use conditions of the catalyst are as follows: the temperature is 30-80 DEG C, the reaction pressure is 0.5-3 MPa, the mass ratio of the acrylic acid to the solvent is 0.1-5, and the mass ratio of the acrylic acid to the catalyst is 0.2-20. Compared with the prior art, the catalyst disclosed by the invention is used as a synthetic catalyst for preparing thiohydracrylic acid through reaction of acrylic acid and hydrogen sulfide, a solid catalyst and a liquid reaction system can be completely separated by adopting simple methods such as filtration, centrifugation or magnetic separation, and a complicated pickling step is not needed; and the problem that a homogeneous catalyst is difficult to rectify after salification in the use process is avoided.

The invention relates to a method for producing methylamine by a generally exothermic gas-phase reaction of methanol and ammonia as reactants in the presence of a heterogeneous catalyst at a pressure in the range of 15 to 35 bar. The reactants are evaporated in one or more heat exchangers and superheated prior to being fed to the reactor, wherein the heat exchangers in turn are heated with a stream of hotter product gas from the reactor. In addition to methylamine (monomethylamine, dimethylamine, and trimethylamine), the product gas stream contains unconverted reactants, water, and any other reaction by-products. To control the reactor inlet temperature and limit it to a temperature in the range of 350 DEG C to 410 DEG C, a suitable quenching liquid is introduced into the hot product gas stream prior to feeding the hot product gas stream to a heat exchanger for heating the reactants. Evaporation and overheating of the added quenching liquid removes the corresponding amount of energy extracted from the hot product gas stream, with the result of efficient and rapid cooling of the hot product gas stream. As a result, the temperature difference between the cold side and the hot side of the heat exchanger is small, which means less energy is transferred to the reactant stream, and thus its reactor inlet temperature can be adjusted or limited.

The present application relates to a kind of heterogeneous catalytic oxidation composite carrier, catalyst and its preparation method and application.The heterogeneous catalytic oxidation composite carrier of the present application is carbon-inert oxide composite carrier of fibrous shape, and the average diameter of the composite carrier is 0.2-50 μm.The composite carrier of the present application can effectively improve carrier utilization effect, and greatly reduce carrier cost.The heterogeneous catalytic oxidation catalyst prepared based on the composite carrier of the present application has the advantages of high catalytic activity, high mass transfer and low cost, and can be applied in ozone catalytic oxidation treatment of wastewater, waste gas and the like.

The invention discloses a lithium carbon dioxide battery containing a homogeneous catalyst, and the homogeneous catalyst is used as a lithium carbon dioxide battery catalyst so as to improve the performance of the battery. The catalyst belongs to an amine organic solvent and is added into an organic electrolyte of a lithium carbon dioxide battery, the electrolyte has high carbon dioxide adsorption rate and carbon dioxide mass transfer capacity, and the homogeneous catalyst can regulate and control a three-phase interface and the catalytic capacity of carbon dioxide electrochemical reduction (CO2RR) / oxidation (CO2ER). After the homogeneous catalyst is added into an electrolyte, the homogeneous catalyst is used for a lithium carbon dioxide battery, so that the discharge capacity of the battery can be improved, the cycle performance of the battery is greatly improved, the charging polarization problem is reduced, and the energy efficiency of the battery is effectively improved.

This invention belongs to the field of homogeneous catalysis technology, and particularly relates to a method for the hydroformylation of propylene to prepare isobutyraldehyde. The method includes: in the presence of a bidentate P-N ligand and a rhodium metal compound, introducing propylene and syngas to carry out a hydroformylation reaction to prepare isobutyraldehyde. The structural formula of the bidentate P-N ligand is as follows: [Insert structural formula here]. Wherein, R1 is selected from one of C2-C4 alkyl groups, substituted or unsubstituted phenyl groups; R2 is selected from one of hydrogen, C1-C4 alkyl groups, alkoxy groups, substituted or unsubstituted phenyl groups. This method provides a highly active P-N ligand, which, while reducing the amount of rhodium catalyst, maintains high activity and can significantly improve the conversion rate of propylene, as well as the selectivity and yield of isobutyraldehyde.

The application provides a multifunctional continuous flow heterogeneous or homogeneous catalytic series reaction device, which comprises a raw material gas supply pipeline, a first gas purification device, a first constant-temperature bubbling gas redispersion device, a second constant-temperature bubbling gas redispersion device, a light-concentrating photothermal reactor, a second gas purification device, a reaction gas velocity cooling device, a gas-liquid separation device and a gas collection device which are sequentially connected in pipeline along the fluid flow direction, and a fluid directional control system. Through the composite heat-resistant cavity structure and the light-heat-flow collaborative design, the device realizes the tolerance to extreme heat environment and the elimination of local hot spots, and the service life is improved by more than 3 times; through the three-stage purification process and the multi-parameter independent control system (temperature / pressure / flow rate / light intensity), the stability of the oxygen-sensitive reaction is ensured, and the reaction selectivity is more than 95%. The device solves the engineering scale-up problem in the light-concentrating catalysis field, the mass transfer efficiency is improved by 5-8 times compared with the batch system, and provides an expandable technical platform for the continuous production of solar fuels.

The invention discloses an immobilized basic ionic liquid catalyst, and aims to solve the problems that a traditional homogeneous pyrrolidone potassium catalyst is difficult to recover, many side reactions exist and the conversion rate is limited. The catalyst is composed of an inorganic porous carrier, a silane coupling bridging group and a basic ionic liquid functional unit, and ionic liquid is immobilized on the surface of the carrier through a covalent bond to form a high-alkalinity, high-stability and recyclable heterogeneous catalysis system.

The invention discloses a water quality purification system based on a heterogeneous catalytic material and an ecological floating bed. The water quality purification system comprises a floating bed device, a purification device, a fixing device and a water moving trolley, the floating bed device comprises a floating bed carrier and aquatic plants planted on the floating bed carrier; root systems of the aquatic plants extend into the water, and microorganisms are attached to the root systems; the purification device is arranged on the floating bed carrier, is in contact with water flow and comprises a plurality of purification assemblies distributed on the floating bed carrier at intervals, and each purification assembly comprises a purification bag suspended on the floating bed carrier and a heterogeneous catalytic material loaded in the purification bag; the fixing device is arranged on the floating bed carrier and fixes the floating bed carrier on the water surface of a target area; the water moving trolley is connected with the floating bed carrier and drives the floating bed carrier to the water surface of the target area; according to the water quality purification system disclosed by the invention, a material-plant-microorganism three-in-one synergistic purification framework is constructed, and the potential of an ecological floating bed in the aspects of sustainable pollution control and phosphorus resource recovery is remarkably enhanced.

This application discloses a heterogeneous catalyst for the selective hydrogenation of nitrile rubber and its application. The heterogeneous catalyst, by weight percentage, consists of 1–10% noble metal particles and 90–99% support, wherein the support is alumina, cerium oxide, titanium dioxide, zirconium oxide, or neodymium oxide. The content of positively valence noble metal in the catalyst accounts for 20–80% of the total noble metal element content, and the noble metal is uniformly loaded on the support. The noble metal is Rh, Os, Ir, Pt, Ru, or Pd, and the particle size of the noble metal particles is 1–20 nm. The heterogeneous catalyst of this invention can carry out hydrogenation reactions at room temperature and pressure, and its hydrogenation selectivity is as high as 100%, with a hydrogenation activity >99%.

The utility model relates to the technical field of chemical catalytic reaction separation, and discloses a nano heterogeneous catalyst separation and recovery device which comprises a separation box, a controller is fixedly mounted on the outer wall of the separation box, and a separation cylinder is fixedly mounted at the top of the separation box. According to the separation and recovery device for the nano heterogeneous catalyst, the grinding roller is driven to rotate by controlling the controller and utilizing the motor, so that the grinding roller achieves friction impact on reactants on the surface of the catalyst, and then the reactants attached to the surface of the catalyst are separated; the output ends of the first telescopic rod and the fourth telescopic rod on the inner wall of the grinding roller are clamped with the outer wall of the circular groove, so that when the grinding roller drives the adjusting rod to rotate, the adjusting rod is rotationally adjusted on the outer wall of the telescopic rod, and the output ends of the telescopic rods are clamped with the circular groove for fixation; and the cleaning brush is used for cleaning the inner wall of the separation cylinder.

The present invention relates to the field of organic synthesis, and discloses an ester compound synthesis method, which comprises: mixing an organic acid raw material and an organic alcohol raw material, and carrying out a reaction under the action of a homogeneous catalyst to obtain an ester compound, the mixing index of the organic acid raw material and the organic alcohol raw material being greater than or equal to 0.9 after the organic acid raw material and the organic alcohol raw material are mixed. According to the method, the conversion efficiency of the ester production process is improved by accurately controlling the mixing index of the esterification reaction system.

This invention provides a method for determining the deactivation temperature and deactivation characteristics of a hydroformylation catalyst, comprising: S1. preparing a hydroformylation reaction solution; S2. measuring the reaction solution and placing it in an adiabatic testing instrument to simulate a hydroformylation reaction, stopping the heating when the temperature reaches T0 and incubating the reaction under adiabatic conditions; recording the temperature change and obtaining the highest temperature T. m S3. After cooling the test ball, remove half of the reactant material, add the hydroformylation reaction raw material, and heat up to simulate the hydroformylation reaction. When the temperature reaches T1, stop heating and perform an adiabatic reaction. Record the highest temperature T. mf S4. Compare T1 and T m and T mf If T mf =T1, catalyst deactivation temperature is T m Irreversible inactivation; if T mf =T m The catalyst deactivation temperature is T m Reversible inactivation; if T mf >T m Remove the material from the test sphere and repeat steps S2 to S4. The judgment method of this invention has a short testing cycle, high safety, and eliminates the need for sample separation and component analysis. It provides guidance for research on catalyst operating limits and the selection of homogeneous catalyst recovery temperatures.

The invention provides a preparation method and application of macrocyclic multi-amino porous organic aerogel, and belongs to the field of catalysts. The preparation method comprises the following steps: reacting tetraazacyclododecane with chloromethyl styrene to obtain an intermediate; and carrying out sol-gel polymerization on the intermediate, and drying to obtain the macrocyclic multi-amino porous organic aerogel. As a thermal insulation material and a heterogeneous catalyst, the macrocyclic multi-amino porous organic aerogel can be applied to thermal insulation and cycloaddition reaction of a halogenated epoxy substrate and carbon dioxide, and has the characteristics of high conversion rate and high selectivity.

The application discloses a supported chiral phosphine heterogeneous catalyst and a preparation method and application thereof, and relates to the technical field of heterogeneous catalyst preparation. The method comprises the following steps: mixing hollow mesoporous polystyrene nanospheres, chiral phosphine and DCE, stirring, adding FDA, stirring, adding concentrated sulfuric acid dropwise, and reacting to obtain a reactant one; and mixing the reactant one, toluene, tetramethyldisiloxane and tetraisopropyl titanate, and reacting under temperature rise to obtain the supported chiral phosphine heterogeneous catalyst. The application is simple and convenient in a one-pot method, and can efficiently anchor the chiral phosphine and its oxide catalyst to the carrier. The application solves the problems of complicated modification in the existing organic catalyst immobilization process and mass transfer limitation of the prepared catalyst.

The invention discloses a nitrogen-doped carbon catalyst based on weathered coal humic acid as well as a preparation method and application of the nitrogen-doped carbon catalyst. According to the method, weathered coal humic acid is used as a carbon precursor, the carbon precursor and a specific nitrogen source are mechanically ground and mixed according to the equal nitrogen proportion, and the nitrogen-doped carbon catalyst is prepared after high-temperature calcination and acid pickling. The catalyst is used for activating peroxymonosulfate (PMS) to degrade tetracycline, and under the conditions that the dosage of the catalyst is 0.2 g / L and the concentration of the PMS is 1.0 mM, the degradation rate of 20mg / L tetracycline in 30 minutes exceeds 85%. The synergistic effect of inherent trace iron in humic acid and an external nitrogen source is utilized, and high-activity sites are formed in situ in the pyrolysis process; dry grinding is adopted in the process, additional metal sources and solvents are not needed, low-cost and environment-friendly preparation of the efficient heterogeneous catalyst from waste resources is achieved, and a new material is provided for degradation of organic pollutants.

This invention discloses a metal-doped defect-rich Pd-based catalyst, its preparation, and its application in the heterogeneous catalytic hydrogenation of nitrile butadiene rubber (NBR). The catalyst involves doping hydrothermally synthesized TiO2 nanosheets with metal atoms in the TiO2 lattice using a pre-impregnation followed by calcination strategy, inducing numerous defect sites on the surface. Then, active metal Pd is loaded using an equal-volume impregnation method, followed by reduction to obtain the catalyst. The catalyst obtained by this invention exhibits high stability and high dispersibility of the metal active component. Its application in the NBR hydrogenation reaction demonstrates high catalytic efficiency and good recyclability, which is of significant importance for the preparation of high-value-added hydrogenated NBR.

The invention relates to ylide-functionalized phosphane ligands, the production of same and use in transition metal compounds, as well as the use of same as catalysts in organic reactions.

To provide a catalyst especially useful in a process for preparing methyl methacrylate from methacrolein and methanol.SOLUTION: A heterogeneous catalyst comprises a support and a noble metal, wherein the support comprises silicon, and wherein the catalyst comprises from 0.1 to 40 mol% titanium and from 0.1 to 10 mol% of at least one noble metal based on total moles of silicon atoms and metal atoms. The noble metal can be, for instance, gold on silica.SELECTED DRAWING: None

This invention relates to the field of catalyst technology, and in particular to a MgO nanocluster catalyst, its preparation method, and its application. The preparation method of the MgO nanocluster catalyst involves adding magnesium salt and long-chain diol to a solvent, and then adding a surfactant dropwise. Under heating conditions, the MgO nanocluster catalyst forms a catalyst. Due to its size-driven surface effect, the MgO nanocluster catalyst possesses a large number of oxygen vacancies and low-coordination sites, forming strongly basic catalytic active centers. The MgO nanocluster catalyst is applied to the preparation of dipropylene glycol ethers. Using propylene oxide and alcohol as raw materials, a two-stage series reactor packed with the MgO nanocluster catalyst is used for the reaction. The use of the MgO nanocluster catalyst effectively improves the conversion rate of propylene oxide and the selectivity of primary ethers. Its nanocluster structure makes it easy to separate from the product by physical methods, overcoming the difficulties of traditional heterogeneous catalysts and product separation, significantly improving production efficiency, and showing good industrial application prospects.

The invention discloses a method for preparing primary amine chemicals by hydrogenation amination of aldehyde and ketone through a platinum group monatomic doped nickel-based layered hydroxide catalyst, and belongs to the technical field of heterogeneous catalysis preparation of high-quality chemicals. The method comprises the following steps: by taking aldehyde and ketone chemicals as raw materials and ammonia gas as a gas source, carrying out hydrogenation amination reaction in a reaction solvent under the action of a platinum group monatomic doped nickel-based layered hydroxide catalyst and a hydrogen atmosphere to prepare a primary amine chemical; the platinum group single atom is any one of palladium, platinum, ruthenium, iridium or rhodium; wherein the effective active components on the nickel-based layered hydroxide carrier are composed of nickel metal and other metals, and the other metals are one or more of zinc, magnesium, aluminum, cerium, manganese, zirconium, iron, niobium or copper. The primary amine chemical prepared by the method has very high economic value.

The present invention relates to a catalyst assembly for carrying out a heterogeneous catalytic reaction in a predetermined temperature range T, characterized in that it comprises at least one catalyst compound capable of catalyzing said reaction in the temperature range T and an assembly of ferromagnetic material in the form of micrometric particles and / or wires, said ferromagnetic material being heatable by magnetic induction using a field inductor. The present invention also relates to the use of said catalyst assembly for carrying out a heterogeneous catalytic reaction, such as a methanation reaction.

A mixture of methylene diphenylamine isomers and polymethylene polyaniline is prepared with a controllable ratio of methylene diphenylamine isomers. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylenediamine (acetalamine), which is then partially rearranged in the presence of a heterogeneous catalyst to a mixture of aminobenzylaniline and methylene diphenylamine isomers. Further rearrangement is performed in the presence of a homogeneous catalyst to convert the remaining aminobenzylaniline isomers to methylene diphenylamine and polymethylene polyaniline.