35results about How to "Improve catalytic reaction efficiency" patented technology

The invention discloses an electrocatalyst material for in-situ production of hydrogen peroxide through oxygen reduction as well as a preparation method and application of the electrocatalyst material, and belongs to the field of organic wastewater treatment. MoS2 / Fe porous conductive particles and a high-molecular polymer are adopted as main components, and ethanedioate and polyacrylamide are combined as a dispersion auxiliary solvent and a pore-forming agent to form a three-dimensional composite conductive catalyst material; through ultralow-temperature freeze drying and microwave radiation technologies, the material structure is optimized, the catalytic reaction active sites are improved, and efficient electrocatalytic oxygen reduction for in-situ production of hydrogen peroxide is realized; the MoS2 / Fe porous conductive particles not only optimize the performance of the catalyst, but also realize high-valued utilization of solid wastes; the electrocatalyst material has excellent conductivity, catalytic activity and organic wastewater degradation capability, is stable in removal effect before and after use, can be repeatedly used for multiple times, reduces the use cost, and provides a wide application prospect for the fields of environmental protection, energy and the like.

The invention belongs to the technical field of biosensing instant detection, and relates to DAAO / HRP-MAF-7 hydrogel as well as a preparation method and application thereof. The hydrogel is formed by immobilizing horse radish peroxidase (HRP) and D-amino acid oxidase (DAAO) in a hydrophilic metal organic framework MAF-7, and then loading the prepared DAAO / HRP-MAF-7 biological composite material and a color developing agent TMB in PEG-DA hydrogel together. The DAAO / HRP-MAF-7 hydrogel can be used as a biosensor to be applied to detection of D-amino acid.

The invention discloses an anthraquinone-based MOF photocatalytic material as well as a preparation method and application thereof. The anthraquinone-based MOF photocatalytic material is prepared by carrying out solvothermal reaction on a ligand DPAq and a nickel source in a mixed solvent, wherein the ligand DPAq is 2, 6-bis (pyrazol-4-yl)-9, 10 anthraquinone, and the mixed solvent is a composition of N, N-dimethylformamide and water. The anthraquinone-based MOF photocatalytic material shows an appropriate band gap and good ROS generation efficiency and shows excellent catalytic activity and selectivity when applied to benzylamine coupling reaction, the reaction selectivity reaches 100%, the product yield can reach 97%, and the catalytic reaction efficiency is high; the product can be recycled, and the yield of the product can still reach 92% after the product is recycled for 5 times.

The invention discloses a nitrogen-doped carbon nanotube coated CoP / Co2P heterostructure electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalytic materials. The preparation method comprises the following steps: by taking cobalt nitrate hexahydrate as a cobalt source and guanine as a carbon source and a nitrogen source, synthesizing a cobalt precursor by adopting a high-temperature carbonization method, then calcining the cobalt precursor to obtain a cobaltosic oxide precursor, and phosphating the cobaltosic oxide precursor to obtain the nitrogen-doped carbon nanotube coated CoP / Co2P heterostructure electrocatalyst. The catalyst has a relatively large specific surface area and multiple active sites, the specific surface area is 20-21m < 2 > / g, the pore size is distributed in a micropore-mesopore-macropore hierarchical pore structure, and the pore structure is mainly distributed in a range of 3-4nm. The preparation method of the catalyst comprises the following steps: (1) preparing a cobalt precursor; (2) preparing a cobaltosic oxide precursor; and (3) phosphating. The catalyst is high in catalytic reaction efficiency, and shows relatively good bifunctional activity and relatively strong stability in HER and OER.

The invention discloses carbon monoxide gas oxidative dehydrogenation equipment, which belongs to the field of carbon monoxide treatment and comprises a hollow shell, a gas inlet cover fixedly connected to the upper end of the hollow shell, a bottom plate fixedly connected to the inner wall of the hollow shell and a first exhaust port formed in the lower end of the bottom plate. A first partition plate and a second partition plate located below the first partition plate are further fixedly connected to the inner wall of the hollow shell, and a flow passing cavity is formed between the upper portion of the first partition plate and the air inlet cover. The cooling air ring can exhaust oxygen to the inner wall of the reaction through hole, it is ensured that the oxygen is evenly distributed on the inner wall of the reaction through hole, the oxygen is prevented from being concentrated in a certain area, and therefore the catalytic reaction efficiency is improved; it is ensured that the catalytic reaction is evenly conducted in the whole catalyst, the situation that the reaction efficiency is reduced due to insufficient oxygen or unsmooth airflow in a local area is avoided, and it is ensured that reactants can be fully converted.

The application relates to the field of wastewater treatment catalysis, and discloses a Fe-Cu-Mn ternary hydrotalcite-like catalyst and a preparation method thereof, which comprises iron, copper and manganese; the iron, copper and manganese are distributed in the layer plate metal central site in an atomic dispersion mode; the layer plate oxygen octahedron is in a non-symmetrical stretching distortion state; a 3.2-4.8 degree deviation is generated in the manganese oxygen copper bond angle in the layer plate; the lattice parameter a of the layer plate 110 crystal face direction is 0.305-0.312 nm; the molar ratio of copper to manganese is 1:2-1:5; and the molar sum of copper and manganese to the molar ratio of iron is 2:1-4:1. According to the application, the lattice non-symmetrical distortion induces the space overlap of the auxiliary metal and the iron active center orbit, an electron transfer path is constructed, the shielding effect of the hydroxyl ion on the iron active site under the alkaline environment is eliminated, the catalytic site activity is maintained, and stable and efficient catalytic treatment under wide pH working conditions is realized.

The present invention belongs to the field of biosensor instant detection technology, and relates to a DAAO / HRP@MAF-7 hydrogel and its preparation method and application. The hydrogel is formed by immobilizing horseradish peroxidase HRP and D-amino acid oxidase DAAO in a hydrophilic metal organic framework MAF-7, and then the prepared DAAO / HRP@MAF-7 biocomposite material and the color developer TMB are co-loaded in a PEG-DA hydrogel. The DAAO / HRP@MAF-7 hydrogel can be used as a biosensor to detect D-amino acids.

The invention discloses a method for copolymerizing and synthesizing a triazinyl carbon nitride photocatalyst, which is characterized in that a triazinyl carbon nitride polymer is designed and synthesized by using a nitrogen-rich comonomer and a nitrogen-deficient comonomer, and accurate control of structural defects in the triazinyl carbon nitride polymer can be realized by adjusting the stoichiometric ratio of the comonomers in the process. Efficient separation and migration of photon-generated carriers in the triazinyl carbon nitride polymer are promoted, and the utilization efficiency of the photon-generated carriers is improved, so that the reaction efficiency of hydrogen production through water decomposition is improved. The copolymerization synthesis method of the triazinyl carbon nitride photocatalyst, provided by the invention, is simple to operate, mild in reaction condition and high in accuracy, and has a potential industrial application prospect.

The present invention relates to the field of catalysts, and discloses a multi-stage hydroisomerization catalyst combination method and a multi-stage hydroisomerization method. The combination method comprises a first hydroisomerization catalyst and a second hydroisomerization catalyst sequentially loaded along a logistics direction, wherein the first hydroisomerization catalyst is loaded in a first hydrogenation reactor, and the second hydroisomerization catalyst is loaded in a second hydrogenation reactor, wherein the first hydroisomerization catalyst and / or the second hydroisomerization catalyst independently comprise a ZSM-48 molecular sieve, wherein the molar ratio of silicon oxide to aluminum oxide in the ZSM-48 molecular sieve is not less than 40, and the specific surface area of ​​the ZSM-48 molecular sieve is not less than 200 m 2 / g, the crystals of the ZSM-48 molecular sieve are ellipsoidal, the major diameter does not exceed 700 nm and the ratio of major diameter to minor diameter is 1-3: 1. The multi-stage hydroisomerization catalyst combination method provided by the present invention helps to improve the efficiency of the catalytic reaction. When the method of the present invention is used to process oil products, the product pour point is lower and the product yield is higher.

The invention discloses a preparation method and application of a space charge separation type carbon nitride nanocrystal. According to the present invention, by using the characteristics of polymer carbon nitride deamination polymerization, the synthesis process for accelerating the carbon nitride deamination polymerization under the semi-closed condition is designed, the high-crystallinity carbon nitride nanocrystal with the space charge separation is prepared, the separation and the migration of the photon-generated carrier can be promoted, and the utilization efficiency of the photon-generated carrier can be improved; the carbon nitride nanocrystal can be used as a catalyst for photocatalytic decomposition of water to produce hydrogen. The carbon nitride nanocrystal is simple in preparation step, mild in reaction condition, high in repeatability and easy to synthesize, and has a certain industrial application prospect.

The application discloses a fibrous nitrogen-doped carbon metal mesh composite membrane for water treatment, which utilizes a metal mesh as a base film and a metal source, uses amino acids as a nitrogen source and a carbon source, and forms a stable nitrogen-doped carbon layer through a calcination process and uniformly distributes the nitrogen-doped carbon layer on the surface of the metal mesh. The application utilizes abundant amino and carboxyl functional groups in amino acid molecules, forms a stable chemical chelate structure with metal ions of the metal mesh base through coordination bonding, and effectively enhances the interfacial bonding strength between the nitrogen-doped carbon and the metal mesh base film in the carbonization process through the bonding mechanism at the molecular level.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

The invention discloses a carbon monoxide removal device and method, relates to the field of carbon oxide separation, and solves the problems that when an existing carbon monoxide removal device is used, the catalytic efficiency of a catalyst is relatively low, and the catalyst is difficult to be subjected to reduction treatment synchronously at the high temperature of a reaction. Comprising a tank body, a removal mechanism, a reduction mechanism, a switching mechanism, a gas inlet pipe and a gas outlet pipe, the removal mechanism comprises a switching column and a storage tank, and the reduction mechanism comprises a spiral pipe. The high temperature generated in the catalytic reaction is used for heating the reducing gas in the spiral pipe, then the high-temperature reducing gas is output into the corresponding storage tank for reduction treatment, and the switching mechanism is used for stirring the catalyst in the storage tank, so that the efficiency of the catalytic reaction and the reduction process is improved; and meanwhile, the position of the storage tank in the switching column can be switched.

The present application relates to the technical field of petroleum chemical industry, in particular to a kind of heterogeneous synthesis device and method of cyclohexanone oxime.The synthesis device of the present application includes vortex reactor, rotating rod and stirrer;By inserting rotating rod in vortex reactor, annular reaction zone with gap size of 0.5mm-5mm is formed, under the dual action of microscale effect and rotating field, mass transfer resistance is reduced, reaction liquid and catalyst particles are fully contacted, and reaction liquid can be broken into smaller droplets under the shear force provided by rotating field, so that the contact area of oil-water two phases is increased, fully emulsified, uniformly mixed, and the flow distribution of catalyst particles is more uniform, the efficiency of catalytic reaction is improved;At the same time, the concentration distribution of hydrogen peroxide in annular reaction zone is controlled by cooperating with multi-stage feeding mode of hydrogen peroxide, so that the concentration of hydrogen peroxide is matched with the rate of catalytic reaction, thereby improving the utilization rate of hydrogen peroxide, and realizing the efficient synthesis of cyclohexanone oxime.

The present invention discloses a super-amphiphilic carbon and a preparation method and application thereof. Its preparation method comprises the following steps: mixing wood powder with an ionic liquid containing tetrafluoroborate anions, and then pyrolyzing in an inert atmosphere to obtain super-amphiphilic carbon. The super-amphiphilic carbon of the present invention is used to prepare Pickering emulsions or in Pickering emulsion catalysis. The super-amphiphilic carbon prepared by the present invention has both super-hydrophilicity and super-lipophilicity, and the contact angles for water and oil such as dodecane are close to 0°. The super-amphiphilic carbon can form a Pickering emulsion in an oil-water system; and can improve the efficiency of related oxidation reactions. The present invention helps to realize the formation of a stable Pickering emulsion in an oil-water system, and further improves the efficiency of the catalytic reaction in the emulsion.

This invention discloses a catalytic synthesis method for 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2-( 5H A method for reacting 1-arylmethyl-4-arylmethylenepyrrole-2,3-dione compounds and diethyl phosphonate in an organic solvent under the presence of a base catalyst undergoes a Michael addition and a 1,4-P-Brook rearrangement tandem reaction. Sodium ethoxide is then added for hydrolysis to yield 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2,3-dione compounds and their derivatives. 5H )-ketone. This invention achieves 3-hydroxypyrrole-2-( )-ketone in one step through a series of reactions in a one-pot reaction mode. 5H Alkylation of ketones at the C(4) position: The catalyst used is mild and readily available, enabling highly efficient catalytic reactions with good yields of the target product. It is both economical and environmentally friendly, making it suitable for large-scale applications.

The present application relates to the technical field of electrode material, in particular to Co3S4 / MnCo-LDH / MnCo2S4 nanocomposite material and its preparation method and application. The present application takes soluble manganese salt and soluble cobalt salt as raw materials, takes foam nickel as carrier, carries out hydrothermal reaction under alkaline environment to obtain MnCo-LDH / NF, then immerses MnCo-LDH / NF in a precursor solution composed of soluble cobalt salt and 2-methyl imidazole, and carries out coordination reaction to obtain MnCo-LDH@ZIF-67 / NF, finally adopts thioacetamide to incompletely sulfide MnCo-LDH@ZIF-67 / NF to obtain Co3S4 / MnCo-LDH / MnCo2S4 nanocomposite material. Through Co3S4 and MnCo-LDH, the technical defects existing in MnCo2S4 are overcome.

The invention discloses a catalytic reaction rectifying tower and a rectifying process for preparing 1, 3-dioxopentane, and relates to the field of rectifying towers, the catalytic reaction rectifying tower comprises a distillation tower and a catalytic module, the catalytic module comprises a catalytic shell and a fixed shell, the catalytic shell can rotate in the fixed shell, the catalytic shell is connected with a plurality of catalytic assemblies, and the catalytic assemblies are connected with the fixed shell. The catalytic module comprises a plurality of catalytic assemblies, the catalytic assemblies are concentrically arranged in a circumferential mode, each catalytic assembly further comprises a catalytic tube and two catalytic covers, the two catalytic covers are in threaded connection with the two ends of the catalytic tube respectively, catalytic holes are formed in the catalytic covers, and the catalytic module further comprises two adjusting assemblies. The catalytic particles in one catalytic tube are independently replaced each time, it is guaranteed that the catalytic particles in the catalytic tubes have good catalytic efficiency, in the replacement process, other catalytic tubes can still conduct catalytic reaction, the shutdown time for replacing the catalytic particles and cleaning the catalytic tubes is shortened, and the service life of the catalytic tubes is prolonged. Catalytic particles of the catalytic tube in the inner ring of the catalytic shell can be replaced, the replacement range is large, and the adaptability is higher.

The present invention discloses a multifunctional electrocatalytic carbon dioxide reduction electrolytic cell device; including an anode chamber flow slot plate, a proton exchange membrane, a cathode chamber flow slot plate and an end plate component arranged in sequence; the end plate component is an end plate, or an end plate structural component having a carbon dioxide channel communicating with the cathode chamber and having a built-in working electrode. The present invention can select the slot plate assembly according to the needs to realize the switching of two electrolytic cells, wherein the S-shaped flow channel slot plate of the end plate structural component has a cross-like structure in the middle, forming four small windows, so that the gas introduced forms a disturbance residence time for a long time, and carbon paper is used as a gas diffusion layer in conjunction with the gas chamber flow channel slot plate and the cathode chamber flow slot plate to strengthen the diffusion of gas to carbon paper and reduce the penetration of liquid into the gas chamber. In addition, the anode / cathode chamber flow slot plates are both provided with gas-liquid inlets and outlets, and an external peristaltic pump can realize the real-time update of the electrolyte. At the same time, real-time online detection and analysis can be realized by gas chromatography and ion chromatography detection means.

The invention discloses a self-supporting CoNiC / CoNibc catalyst, a preparation method of the self-supporting CoNiC / CoNibc catalyst and application of the self-supporting CoNiC / CoNibc catalyst in the aspects of efficient electro-catalytic hydrolysis and rechargeable zinc-air batteries. The material is prepared by combining a hydrothermal method and a calcination method, CoNibc loaded on a self-supporting substrate is generated by the hydrothermal method, the CoNibc on the surface is decomposed and synthesized again during calcination, and finally in-situ synthesis of CoNiC / CoNibc is realized; the synthesis mode not only overcomes the defects that the load on the surface of the non-self-supporting material is easy to fall off and the stability is poor, but also ensures the overall stability of the composite material. In addition, the appearance of the synthesized CoNiC ultrathin nanosheet greatly increases the exposure of active sites, and the overall catalytic activity of the composite material is improved. Meanwhile, the introduction of the alkali-resistant and heat-resistant cheap stainless steel mesh self-supporting substrate not only improves the conductivity of the composite material, but also ensures the stable operation of the zinc-air battery in a high-concentration electrolyte environment. The catalyst has efficient catalytic hydrolysis activity and long-time charge-discharge cycle performance.

The application relates to the technical field of photocatalysts, in particular to a TiO2-MOFs photocatalyst and a preparation method and application thereof, and comprises the following steps: adding TiO2 nanoparticles into deionized water to obtain a solution A through dispersion, adding modified MIL-88A / GO into the solution A to obtain a mixed solution, stirring the mixed solution, washing the mixed solution through centrifugal separation of ethanol and deionized water alternately, and freeze-drying to obtain a modified TiO2-MOFs photocatalyst. Through the compounding of the TiO2 nanoparticles and the modified MIL-88A / GO, the adsorption-catalysis synergistic effect is realized, the modified MIL-88A / GO material has the characteristics of high specific surface area, porosity and controllable pore size, can efficiently adsorb pollutants in organic wastewater, provides a high-concentration reaction environment for the photocatalytic reaction of the TiO2 nanoparticles, and the electron-hole pairs generated under the excitation of photons of the TiO2 nanoparticles as the efficient photocatalyst can quickly oxidize and degrade the adsorbed pollutants.

The invention discloses a solid acid catalyst for a micropacked bed reactor and a preparation method of the solid acid catalyst, and relates to the field of catalysts. The preparation method of the solid acid catalyst comprises the following steps: (1) providing a porous carrier, and modifying the porous carrier by adopting an acid solution so as to load hydroxyl on the surface of the porous carrier to obtain a modified carrier; (2) mixing the modified carrier with a solution containing silane, and reacting at 50-200 DEG C for 0.5-36 hours to obtain a first basic catalyst; wherein the silane has a carbon chain length greater than or equal to 3; (3) mixing the first base catalyst with an oxidizing solution, and reacting at 30-100 DEG C for 0.5-36 hours to obtain a second base catalyst; and (4) mixing the second basic catalyst with a solution containing a sulfonic acid group, and reacting at 30-100 DEG C for 0.5-36 hours to obtain a reinforced solid acid catalyst finished product.

The present invention provides an in-situ electrocatalytic electrode, and a catalytic reaction device and method thereof. The in-situ electrocatalytic electrode comprises a carrier with a pore structure, and at least one side surface of the carrier is sequentially stacked with a porous hydrophobic membrane, a conductive layer and a catalyst layer. The catalytic reaction device comprises a first reaction module and a second reaction module that are interconnected, wherein the first reaction module is provided with an in-situ electrocatalytic electrode, and the second reaction module is provided with a counter electrode, and the in-situ electrocatalytic electrode and the counter electrode are connected by a wire. The method comprises: an electrolyte is electrolyzed on the surface of the in-situ electrocatalytic electrode to produce active reactants, and the raw materials introduced react with the active reactants under the action of the catalyst layer and the power supply to produce products. The present invention generates active reactants in situ on the surface of the catalyst layer, optimizes the steps of adsorption of reactants on the catalyst surface and conversion into active reactants during the catalytic reaction, and effectively improves the efficiency of the catalytic reaction.

The invention relates to the technical field of photoelectrocatalysis synthesis, and discloses a continuous flow photoelectrocatalysis reaction instrument which is high in reaction rate and reliability and comprises a photoelectrocatalysis reaction module and an illumination module. The photoelectrocatalysis reaction module is formed by laminating a lower box body, an anode plate, a runner sheet, a cathode plate, optical glass and an upper cover; a runner joint is arranged on one side of the lower box body and is used for inputting and outputting reaction fluid; a detachable power supply mechanism is arranged on the side wall of the lower box body to supply power to the photoelectric catalytic reaction module; runner sheets are arranged on the upper end face and the lower end face of the anode plate, runners consistent with the runner sheets are formed in the anode plate, the upper cover is of a middle hollow structure, and light is received through optical glass to form a light path; the illumination module is used for providing a light source for the photoelectrocatalysis reaction module; the anode plate and the cathode plate are made of non-photosensitive electrodes, so that a light source generated by the illumination module is prevented from being absorbed by the anode plate and the cathode plate, and the light source can fully act on the fluid to be reacted.

The invention discloses a hierarchical pore Zr-Beta molecular sieve as well as a preparation method and application thereof, and relates to the technical field of preparation and application of molecular sieves. The preparation method of the hierarchical pore Zr-Beta molecular sieve comprises the following steps: preparing the hierarchical pore Zr-Beta molecular sieve by a hydrothermal synthesis-etching-recrystallization method; the hierarchical pore Zr-Beta molecular sieve comprises a Beta molecular sieve and Zr loaded on the surface and in a skeleton of the Beta molecular sieve, the average particle size is 100-500 nm, and micropores, mesopores and / or macropores exist in the molecular sieve; the 2, 4-dimethoxyacetophenone is prepared by adopting a hierarchical pore Zr-Beta molecular sieve to catalyze Friedel-Crafts acylation reaction (m-dimethoxybenzene and acetic anhydride) under a solvent-free condition. The hierarchical pore Zr-Beta molecular sieve has a hierarchical pore structure and an acidic molecular sieve catalytic active site, and has a synergistic catalysis effect, and the method for preparing 2, 4-dimethoxyacetophenone is green, environmentally friendly, simple and convenient to operate and high in catalytic efficiency.

The invention discloses a heterocyclic ring-containing thiourea ligand and a preparation method and application thereof, and compared with the prior art, the heterocyclic ring-containing thiourea ligand has the following advantages: selection and optimization of a monothiourea skeleton: on the basis of early-stage work, the monothiourea skeleton is still kept in a ring shape, which is a precondition for keeping high activity and stability; on the basis that monothiourea and five-membered ring chain hydrocarbon skeleton structures are reserved, a previous N-connected benzene ring side chain is assumed to be further studied and optimized into an aliphatic carboxylic acid side chain, a functionalized aromatic ring is combined on a five-membered ring chain hydrocarbon skeleton, and the water solubility of thiourea ligand molecules is changed by changing the structure of the novel thiourea ligand, so that the water solubility of the thiourea ligand molecules is improved. The steric hindrance and the electronic effect can generate controllable influence on the catalytic efficiency and the recoverability of the thiourea ligand.

The utility model discloses a catalyst basket fixing component and a fixed bed reactor, and relates to the technical field of catalytic devices. The problems that in the positioning and fixing process of a catalyst lifting basket in the prior art, an inner component shifts, and a sealing ring is damaged are solved. The supporting seat comprises a supporting seat body, and a side plate used for being placed on a catalyst lifting basket is arranged at the end of the supporting seat body. Open holes are formed in the centers of the side plates respectively, a screw rod is inserted into each open hole, and a nut used for being matched with the screw rod to conduct stroke adjustment is welded to the outer side of each open hole. A locking nut is arranged in each screw rod, and the adjusted screw rods are positioned through the locking nuts. The catalyst basket fixing component mainly adopts an adjustable torque device, transmits torque through the adjusting screw rod, can realize quick positioning, is firm and reliable in positioning and high in centering precision, fully integrates the catalyst basket in a fixed bed reactor, and becomes a powerful guarantee for stable reaction.

The invention relates to the technical field of wastewater treatment, in particular to a quartz sand-based PMS catalyst and a preparation method thereof.The preparation method comprises the steps that pretreated quartz sand is put into an alkaline solution of dopamine hydrochloride, stirring reaction is conducted for 10-16 h at the room temperature, the quartz sand is separated, washing and drying are conducted with water and ethyl alcohol respectively, and quartz sand wrapped with a polydopamine layer is obtained; dissolving divalent manganese salt and cobalt salt in water to obtain a first solution, and dissolving 2-methylimidazole in water to obtain a second solution; and immersing the quartz sand wrapped by the polydopamine layer into a mixed solution of the first solution and the second solution, carrying out stirring reaction at room temperature, carrying out solid-liquid separation, washing a solid phase with water and ethanol respectively, and drying to obtain the quartz sand-based PMS catalyst. The catalyst disclosed by the invention has good separation, recovery and reutilization characteristics, and the catalytic efficiency is promoted by utilizing polydopamine, so that the degradation speed of PMS on organic matters in wastewater is greatly improved.

The invention provides a method for catalyzing an alpha, beta, gamma, delta-unsaturated ketone chiral boron addition reaction through a nano-composite microsphere supported copper material, and belongs to the technical field of asymmetric catalyst.The method comprises the following steps that in a reaction solvent, alpha, beta, gamma, delta-unsaturated ketone chiral boron addition reaction is carried out, and alpha, beta, gamma, delta-unsaturated ketone chiral boron addition reaction is carried out; the preparation method comprises the following steps: carrying out chiral boron addition reaction on beta, delta-unsaturated ketone and B2 (pin) 2 under the action of a nano-composite microsphere loaded copper material and a chiral ligand to obtain a 1, 4-chiral boron compound; a carrier of the nano-composite microsphere loaded copper material is a PS-CS-SiO2 nano-composite microsphere, the PS-CS-SiO2 nano-composite microsphere is composed of PS monodisperse microsphere powder, SiO2 and chitosan, and an active component Cu < 2 + > is loaded on the PS-CS-SiO2 nano-composite microsphere. 3-7 mg of the nano composite microsphere loaded copper material is added into every 0.2 mmol of alpha, beta, gamma, delta-unsaturated ketone. The nano-composite microsphere loaded copper material is used as a catalyst to catalyze alpha, beta, gamma, delta-unsaturated ketones to perform chiral boron addition reaction, and the nano-composite microsphere loaded copper material is used as a novel catalytic material, can be recycled, and is green and environment-friendly.