632 results about "Catalytic effect" patented technology

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

The invention relates to the technical field of electrocatalytic oxidation devices, and discloses an electroplating rinse sewage complex breaking electrocatalytic device based on titanium-based nano conductive ceramics, which comprises an oxidation pond and an acquisition module, the acquisition module acquires catalytic liquid information in real time, and the catalytic liquid information comprises components and state data of a catalytic liquid. And the catalysis module is responsible for treating a catalytic liquid and destroying a complex by utilizing an electro-catalysis reaction. The central control module analyzes complex components of a catalyst through a convolutional neural network (CNN) and a recurrent neural network (RNN), and dynamically adjusts electro-catalysis parameters on the basis of a fuzzy control algorithm in combination with historical data and real-time information so as to optimize the catalytic effect. And the early warning module monitors the changes of the catalytic liquid and the electro-catalysis parameters, judges whether early warning needs to be given out or not by comparing the changes with a preset threshold value, and takes corresponding measures according to the risk level. Through real-time data analysis and intelligent control, the accuracy and efficiency of the catalysis process are improved, and the safety and stability of the treatment process are ensured.

The invention discloses a method for degrading polystyrene (PS) plastic and upgrading and recycling the PS plastic into benzoic acid based on nano MnO2 photocatalytic ozonation, and belongs to the technical field of solid waste recycling. The method comprises the following steps: firstly, mixing PS plastic fragments with nano MnO2 and an organic solvent, then simultaneously introducing ozone into a reaction system at normal temperature and normal pressure, and irradiating with light. Through synergistic catalysis of light and ozone, molecular chains of the PS plastic can be efficiently and selectively broken and oxidized, and finally the PS plastic is directionally converted into benzoic acid with high additional value. After the reaction is finished, a benzoic acid product can be obtained through simple separation, concentration and purification steps. The method provided by the invention realizes high-valued recycling of the waste PS plastic under mild conditions, solves the problems of high energy consumption, complex products, easy generation of secondary pollution and the like in a traditional treatment method, and has the outstanding advantages of green process, efficient reaction, high product value and the like.

The invention relates to preparation and photocatalytic application of a three-component covalent organic framework photocatalyst. The invention aims to solve the problems of low visible light utilization rate, low efficiency of photocatalytic synthesis of hydrogen peroxide and complex synthesis process of a multi-component covalent organic framework material in the synthesis of a high-performance photocatalyst in the prior art. The method comprises the following steps: dispersing two reaction monomers into an organic solvent to form a mixed solution, adding a catalyst into the mixed solution, then adding the third monomer, carrying out ultrasonic dispersion, carrying out a heating reaction for a period of time, cooling to room temperature, and carrying out solid-liquid separation to obtain a solid; and carrying out solid separation, collecting the solid, washing and drying to obtain the three-component covalent organic framework material. The prepared TTBTP-1 three-component covalent organic framework photocatalytic material is high in crystallinity and good in catalytic effect and is superior to a two-component photocatalyst, the preparation method is simple, through the design thought that p-phenylenediamine is adopted as a linker to connect two monomers with different structures, the thought is broadened for the design of a novel COF structure and function, and the application prospect is broad. The method has important research significance.

The invention belongs to the technical field of carbon materials, and discloses coal-based porous carbon based on trace salt induction activation and a preparation method thereof. The preparation method of the coal-based porous carbon based on trace salt induced activation comprises the following steps: uniformly mixing Zhundong coal and trace salt to obtain a mixed product, heating the mixed product in an inert atmosphere and then keeping the temperature constant to obtain a carbonized product, and cooling the carbonized product to room temperature in an active atmosphere to obtain activated carbon, sequentially carrying out acid pickling and drying treatment on activated carbon to obtain coal-based porous carbon; the catalytic action of positive ions in trace active salt and the induction action of negative ions can be combined, so that the action effect of the trace salt is further improved, the activation rate is increased, the distribution of a pore structure is regulated and controlled, the specific surface area of the coal-based porous carbon is increased, and the pore structure is also improved.

The invention provides a PTFE modified membrane, a modification method thereof, a wastewater treatment system and a wastewater treatment method, the PTFE modified membrane is obtained by adding metal oxide catalyst particles into a PTFE polymer for modification, and the weight of the metal oxide catalyst particles accounts for 5-20% of the weight of the PTFE polymer; the diameter of the metal oxide catalyst particles is 10-100 nm; the pore-forming rate of the PTFE modified membrane is 53-62%, and the pore diameter range is 0.1-1 [mu] m. The metal oxide catalyst particles are added into the PTFE polymer of the hollow fiber membrane for modification to form the PTFE modified membrane, so that the gasification catalytic effect of ozone on the surface of the membrane material of the hollow fiber membrane module is improved, and full contact, mixing and net-effect removal of pollutants and ozone are realized; therefore, the pollutant removal rate and the quality of a product produced by wastewater treatment are improved; the technological process is simple, field application is convenient, and product performance is stable.

The invention relates to the field of distillation equipment, in particular to a novel distillation tower. The technical problems that in a traditional device, contact between a catalyst and a raw material is not sufficient, the catalytic effect is poor, the distillation efficiency is low, it is inconvenient for workers to intermittently add the raw material into a distillation cylinder, and continuous work is not convenient are solved. A novel distillation tower comprises a supporting frame, a distillation cylinder is fixedly connected to the supporting frame, the distillation cylinder is hollow, a liquid outlet valve is fixedly connected to the bottom of the distillation cylinder, and a heating frame is rotatably connected to the lower portion of the inner wall of the distillation cylinder. The contact frame is driven by the motor to rotate, the contact frame extrudes the limiting plate upwards, the through hole in the limiting plate moves upwards to enter the discharging pipe, raw materials can enter the distillation cylinder, the contact frame continues to rotate to be separated from the limiting plate, the limiting plate limits the raw materials again, intermittent discharging into the distillation cylinder can be facilitated, and continuous work is facilitated.

The invention discloses a metalloporphyrin porous electro-catalytic material with a bcu topological network structure, a preparation method of the metalloporphyrin porous electro-catalytic material and application of the metalloporphyrin porous electro-catalytic material in electro-catalytic oxygen evolution. A quadrangular pyrenyl skeleton molecule with eight connecting nodes and a quadrangular porphyrin skeleton molecule with eight connecting nodes are adopted, an ordered and expanded double-interpenetrating three-dimensional bcu topological network framework material is obtained through [8 + 8] imine condensation, and metallization of a porphyrin unit is further realized through metal ion post-modification, so that the porphyrin unit is obtained. The metalloporphyrin porous electro-catalysis material is obtained; the material as a heterogeneous catalyst has more excellent mass transfer efficiency and more accessible catalytic sites, has a wide application prospect in the field of catalysis, and particularly has an ideal catalytic effect in an electro-catalysis oxygen evolution reaction; # imgabs0 #

The invention discloses a multi-metal layered hydroxide catalytic material and a preparation method and application thereof, and belongs to the technical field of catalytic materials.The preparation method of the multi-metal layered hydroxide catalytic material comprises the following steps that a one-pot solvothermal method is adopted, foamed nickel is soaked in a mixed solution for hydro-thermal synthesis, and the multi-metal layered hydroxide catalytic material is obtained; the multi-metal layered hydroxide catalytic material is prepared; wherein the mixed solution comprises a surfactant, a solvent and at least two of a nickel source, an iron source and a cobalt source. The CO2 desorption rate of the MEA solution is jointly improved through the synergistic effect of multiple metals and the # imgabs0 # acid site provided by the periphery of the metal hydroxide main layer. Under the condition that the desorption temperature (oil bath pan temperature) is 120 DEG C, the highest CO2 desorption rate of the FeCo (1 / 5) material with the best catalytic effect is increased to 7.68 mmol / min, and compared with 4.78 mmol / min under the blank condition, the desorption rate of the FeCo (1 / 5) material is increased by 60.7%, and the CO2 desorption rate is remarkably increased.

The invention belongs to the technical field of ion exchange membranes, and relates to a bipolar membrane and a preparation method thereof.The bipolar membrane comprises a cation exchange membrane, an anion exchange membrane and a middle layer; the cation exchange membrane is sulfonated polysulfone; the anion exchange membrane is aminated chloromethyl polysulfone; and the middle layer is prepared by reacting an organic amine compound with vinyl and chloromethyl polysulfone. The substrates of the three layers of polymers of the bipolar membrane are all made of polysulfone materials, the swelling characteristics of the materials are consistent, the affinity among the three layers is appropriate due to the fact that the three layers are made of the same material, the affinity among the layers of the bipolar membrane is easy to be tight, meanwhile, the stability of the middle catalyst layer is enhanced through a cross-linking method, and the stability of the middle catalyst layer is improved. The loss of the catalytic effect is prevented; the technical problem that the middle layer is prone to loss or blistering is solved.

The invention discloses a preparation method of a bifunctional heterojunction catalyst for AEM electrolyzed water. The method comprises the following steps: step 1, mixing multi-walled carbon nanotubes, deionized water, absolute ethyl alcohol and inorganic acid; step 2, putting the mixed solution in the step 1 into an ultrasonic machine to form a porous structure and more active adsorption sites; step 3, carrying out freeze drying treatment on the mixed solution treated in the step 2; step 4, mixing the dried multi-walled carbon nanotubes with acetylacetone salt, and uniformly grinding the mixed powder; and step 5, putting the powder obtained in the step 4 into a tubular furnace, and carrying out heat treatment in the atmosphere of H2 / Ar to obtain the PtFeCoNiMoZr / ZrO heterojunction catalyst. The catalyst has a remarkable catalytic effect on HER and OER reactions, and meanwhile, stable electrolysis which stably runs for 200 hours in an AEM electrolytic cell under the current density of 1200 mA / cm < 2 > is successfully realized.

A catalyst for an acylation reaction, and a preparation method therefor and the use thereof. The preparation method for the catalyst for an acylation reaction comprises the following steps: (1) adding a cation exchange resin to a 0.1-10 mol / L hydrochloric acid solution, performing an ultrasonic treatment for 1-60 min followed by filtration, washing same with water until the filtrate is neutral, and filtering same; and (2) adding the cation exchange resin, which is obtained after the treatment in step (1), to a chromatographic column, adding a 0.01-5 mol / L Lewis acid solution for leaching, filtering same, then washing same with water, and drying same to obtain a catalyst for an acylation reaction. The catalyst for an acylation reaction can efficiently achieve an acylation catalytic reaction of a naphthalene-containing compound and has a good catalytic effect, and the post-treatment is simple.

A method for catalytically synthesizing a single chiral 2-aryl-substituted nitrogen heterocyclic derivative by means of an imine reductase, and a use thereof. The method comprises: under the catalytic action of an imine reductase, converting a compound represented by formula II into a single chiral compound represented by formula I. In formulas I and II, each R is independently selected from hydrogen, fluorine, chlorine, bromine, C1-C6 alkyl, halogenated C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, cyano, nitro, or carboxyl; X is selected from -CH2- or -O-; and n is an integer selected between 0 and 6. The imine reductase is selected from any one of or a combination of at least two of the following amino acid sequences: (1) an amino acid sequence as shown in any one of SEQ ID NOs: 2, 4, 6, 7, or 10; and (2) an amino acid sequence having imine reductase activity and having at least 90% identity to the sequence as shown in any one of SEQ ID NOs: 2, 4, 6, 7, or 10.

The invention discloses a preparation method and application of an iron carbide nanoparticle modified carbon-based Fe monatomic catalyst, in the preparation process, Fe < 3 + > is complexed with oxalic acid in advance to realize coordination self-assembly and effectively inhibit hydrolysis of Fe < 3 + >, and glucose is used as a carbon-based carrier precursor and a reducing agent to prepare a carbon-based Fe monatomic catalyst. According to the preparation method, the self-assembled iron species are converted into Fe3C nanoparticles at a high temperature, melamine and cyanuric acid are used as N sources to realize N-doped carbon and anchor part of the iron species to form Fe monatomic atoms, and in addition, oxalic acid, melamine and cyanuric acid are easy to decompose at the high temperature to generate small-molecule gas, so that glucose forms a porous carbon structure during high-temperature carbonization, and the porous carbon structure is formed. Finally, Fe3C and Fe monatomic synergistic coexistence hierarchical porous N-doped composite carbon-based catalyst is achieved, the obtained catalyst can efficiently activate peracetic acid and degrade phenol organic pollutants, and the catalyst is simple in preparation process, good in catalytic effect and high in stability and has wide application potential.

The invention belongs to the technical field of biology, and discloses a gene of beta-glucuronidase, an amino acid sequence, an expression vector and a host cell of the beta-glucuronidase and application of the beta-glucuronidase in preparation of glycyrrhetinic acid monoglucuronide. The gene of the beta-glucuronidase is connected with an expression vector and is transformed into a saccharomyces cerevisiae cell, so that the saccharomyces cerevisiae engineering strain with high yield of the beta-glucuronidase is successfully constructed. The glycyrrhizic acid can generate a single product glycyrrhetinic acid monoglucuronide under the catalytic action of the enzyme, and no by-product is generated, so that the aim of efficiently, specifically and safely preparing glycyrrhetinic acid monoglucuronide is fulfilled, and the application and development prospect is wide.

The invention relates to the technical field of catalysts, in particular to preparation and application of a B-site La-doped magnetic nano ZnFe2O4 catalyst.The preparation method of the catalyst comprises the following steps that zinc nitrate, ferric nitrate, lanthanum nitrate and cerous nitrate are selected as base materials, the molar ratio of the zinc nitrate to the ferric nitrate to the lanthanum nitrate to the cerous nitrate is 1: 1.5: 0.5: 0.3, and the molar ratio of the zinc nitrate to the ferric nitrate to the lanthanum nitrate to the cerous nitrate is 1: 1.5: 0.5: 0.3; zinc nitrate, ferric nitrate, lanthanum nitrate and cerous nitrate are dissolved in a eutectic solvent in proportion, then modified citric acid is added as a complexing agent for mixing, and carbon nanotube powder and zinc acetate are added in the process. According to the scheme provided by the invention, the B site of the catalyst is directionally occupied by La, Zn < 2 + > activity loss caused by A site doping is avoided, the stability and catalytic effect of the catalyst are improved by adding Ce, the carbon nanotubes and zinc acetate, and the removal rate of the catalyst to high-concentration or refractory organic matters is improved.

The invention discloses application of a sulfonamide ionic liquid catalyst system in preparation of cyclic carbonate, sulfonamide ionic liquid comprises cations and anions, and the cations are one or more of tetra-alkyl ammonium ions, tetra-alkyl phosphonium ions and trimethyl hydroxyethyl ammonium ions; the anion is one or more of sulfonamide ions or substituted sulfonamide ions; the sulfonamide ionic liquid is used as a catalyst and is used for catalyzing CO2 to react with an epoxy compound to prepare cyclic carbonate; the catalyst is easy to prepare and high in catalytic activity, under normal pressure, the dosage of the catalyst is 1-3 mol%, the reaction time is 1-48 hours, the reaction temperature is 25-100 DEG C, and a substituted epoxy compound can be converted into corresponding cyclic carbonate with high conversion rate and high selectivity. After the catalyst system is recycled for five times, the catalytic effect is not obviously reduced. Meanwhile, the catalyst system has good universality to substrates, and conversion of various epoxy compounds can be efficiently achieved.

The invention discloses a method for synthesizing L-γ-glutamyl-3-carboxyl-4-nitroaniline ammonium salt, and relates to the technical field of organic synthesis. According to the invention, Glupa-C is synthesized by using 5-amino-2-nitrobenzoic acid and 3-nitrophthaloyl-L-glutamic anhydride as starting materials through a condensation reaction and a hydrazinolysis reaction under the catalytic action of a Lewis acid. Compared with traditional alkaline preparation conditions, the use of highly toxic reagents and the safety hazard of explosion during the preparation process are avoided, production risks are reduced, and energy consumption is lowered. In addition, the synthesis method provided by the invention can achieve a total yield of 47.8% and a purity of 99.96% for the product Glupa-C, and is suitable for industrial production.

The invention relates to a lignin-derived carbon aerogel loaded metal nano enzyme and a synthesis method and application thereof, the synthesis method comprises the following steps: adding sodium lignin sulfonate, CoCl2. 6H2O and NiCl2. 6H2O into deionized water, and carrying out ultrasonic dispersion to obtain a lignin-metal solution; uniformly mixing and stirring the lignin-metal-PVA composite precursor solution with a polyvinyl alcohol aqueous solution to obtain a lignin-metal-PVA composite precursor solution; carrying out at least three times of freezing-unfreezing circulation treatment on the lignin-metal-PVA composite hydrogel to obtain lignin-metal-PVA composite hydrogel; carrying out freeze drying treatment to remove moisture, so as to obtain a lignin-metal-PVA composite aerogel precursor; and carrying out pyrolysis treatment in a nitrogen environment, and naturally cooling to room temperature. The lignin-derived carbon aerogel loaded Co-Ni bimetallic nano-enzyme prepared by the invention shows excellent catalytic activity, product selectivity and cycle stability in photocatalytic CO2 reduction reaction of high and low concentration CO2 due to bimetallic synergistic catalytic effect, high specific surface area and stable three-dimensional skeleton.

The invention discloses a preparation method and application of a catalyst for generating benzonitrile through electrocatalytic oxidation of benzylamine, and belongs to the technical field of nanotechnology and electrocatalytic oxidation. The NiO-NiMoO4 / NF multi-component composite catalyst of a nanorod structure is used as an electrode, NiO and NiMoO4 form a heterogeneous interface synergistic system, rich active sites are achieved, and the catalyst shows remarkable advantages in benzylamine electrocatalytic oxidation. Under the working voltage of 1.55 V vs.RHE, 99% of benzylamine conversion rate and 94% of Faraday efficiency are achieved, the stability is good, and the catalytic effect is not attenuated after multiple times of recycling. The method breaks through the activity limitation of a non-noble metal catalyst in a low-alkalinity medium through a multi-component synergistic effect, has the advantages of low preparation cost and mild reaction, and avoids the problems of harsh reaction conditions, low yield and high toxicity of used reagents in other synthesis methods.

The utility model provides a catalyst filling device which comprises a material storage barrel, a filling base plate fixedly installed at the bottom of the material storage barrel, a plurality of discharging pipes fixedly installed on the side face of the filling base plate, a vibration motor fixedly installed at the top of the material storage barrel, a supporting frame fixedly installed at the top of the material storage barrel, and a plurality of discharging pipes fixedly installed at the bottom of the supporting frame. A rotating shaft is fixedly installed at the top of the supporting frame, and a material stirring disc is fixedly installed at the bottom of the rotating shaft. According to the catalyst filling device provided by the utility model, the interiors of the mounting pipe and the connecting pipe are subjected to air exhaust through the fan, so that impurities at the feeding hole are adsorbed to the dust storage barrel through the annular pipe and the feeding hole, and dust is prevented from escaping during feeding to influence the production environment and the body health of workers; and the catalyst falls onto the metal net and collides with the metal net, so that dust falls downwards, and then the dust is adsorbed through the material collecting cover, so that the dust on the surface of the catalyst is cleaned, and the catalysis effect is improved.

The invention discloses a method for preparing a zalvizepam chiral intermediate by an enzyme method. According to the method disclosed by the invention, a compound II is used as a substrate and is converted into a compound I under the catalytic action of transaminase. According to the method disclosed by the invention, the concentration of a conversion substrate can reach 50g / L, the conversion rate reaches 98.5%, and the ee value of the product reaches 99.9%. The method disclosed by the invention is simple to operate and good in selectivity, and can be used for industrial production.

The invention provides a preparation technology of shape memory polyurethane (SMPU) with remarkably enhanced shape memory performance, which comprises the following steps: the material takes polyether polyol as a soft segment to effectively memorize a temporary shape; a diisocyanate tripolymer and a novel chain extender are used as hard segments, so that the memory of a permanent shape is ensured. Under the catalytic action of dibutyltin dilaurate, carbonyl of a diisocyanate tripolymer and ureido in the novel chain extender form a self-assembly structure, so that the shape memory performance of the material is remarkably improved. Results show that two SMPU thin films based on the SMPU thin films both show the shape recovery rate of more than 90%, and both have excellent cycle stability, and show huge potential and application value in the field of shape memory materials.

The invention belongs to the technical field of synthesis and antibiosis of nano-enzyme catalysis systems, and discloses an enzyme catalysis system with a function of targeted inhibition of growth of streptococcus mutans as well as preparation and application of the enzyme catalysis system. The enzyme catalysis system with the targeted inhibition function on the growth of the streptococcus mutans is formed by loading AuNPs and PCN-22 (Fe) on a CMD molecular chain through in-situ growth, and the mass ratio of the AuNPs to the PCN-22 (Fe) to the CMD is (0.22%-0.33%) to (12.34%-21.79%) to (77.88%-87.44%). The cascade catalytic effect of the nano-enzyme is adjusted by regulating and controlling the carboxymethyl substitution degree of CMD, so that glucose in a decayed tooth pathological environment is efficiently catalyzed in one step to generate ROS, and damage to probiotics is reduced while the inhibition efficiency of pathogenic bacteria is improved.

The present invention provides an iridium-based catalyst, a preparation method thereof, and a method for catalytic hydroformylation of propylene. The structural formula of the iridium-based catalyst is where Ph is a phenyl group, x is any one of 0, 1, and 2, and X is any one of Cl, NO<subgt;3< / subgt;, BF<subgt;4< / subgt;, PF<subgt;6< / subgt;, and acac. The iridium-based catalyst disclosed in the present invention has good catalytic effect and high activity, and can still maintain high catalytic performance after being used multiple times.

The invention relates to a catalyst for ring-opening polymerization of ethylene oxide and a preparation method thereof, and belongs to the technical field of polymer material synthesis. The catalyst is a composite structure based on silicon dioxide nanoparticles loaded with bimetallic organic complexes. The invention adopts a special method to prepare a modified nitrogen-containing multidentate ligand, and coordinates with metal ions through covalent bonds to load the ligand on silicon dioxide nanoparticles. The high dispersibility and stability of silicon dioxide nanoparticles and the synergistic catalytic effect of bimetallic organic complexes are utilized to effectively improve the catalytic effect, accelerate the polymerization process, enhance the polymerization stability, increase the polymerization molecular weight, and narrow the distribution.

The invention belongs to the technical field of enzyme engineering and gene engineering, and particularly relates to a recombinant immobilized enzyme, an expression gene thereof and application of the recombinant immobilized enzyme in production of macrocyclodextrin. According to the preparation method, SpyTag and SpyCatcher peptides are fused to the N end of isoamylase and the N end of 4-alpha-glucanotransferase respectively, the 4-alpha-glucanotransferase modified by the SpyTag and the isoamylase modified by the SpyCatcher are obtained, and after spontaneous isopeptide bonds are formed between the SpyTag and the SpyCatcher, the self-assembled macrocyclodextrin production enzyme cluster is obtained. The obtained macrocyclodextrin production enzyme cluster forms an enzyme aggregate with a three-dimensional structure under the traditional glutaraldehyde-mediated catalytic action, namely the recombinant immobilized enzyme. The recombinant immobilized enzyme disclosed by the invention can be repeatedly utilized, is simple and convenient to operate, is easy to separate a converted product, and can be applied to industrial production of the macrocyclodextrin.

The invention discloses cysteine mediated Hf / Cu bimetal synergistic self-assembled nano-particles as well as a preparation method and application of the cysteine mediated Hf / Cu bimetal synergistic self-assembled nano-particles. According to the method, cysteine is used as a multifunctional ligand, carboxyl and sulfydryl of cysteine are in bridge connection with metal through coordination, ligand chelation and assembly guiding effects are synchronously exerted, bimetallic ions are induced to be cooperatively self-assembled in an alkaline system (pH is 9-10), and metal cysteine self-assembled nanoparticles with uniform structures are formed through in-situ nucleation and multistage aggregation. According to the method, the ligand function and the bimetallic synergistic effect are accurately matched, the synthesis process is mild (room temperature), the operation is simple and convenient, and the product is excellent in dispersity and stability. Meanwhile, a close coordination structure constructed by cysteine provides a key channel for energy / electron transfer from sensitizing metal to Cu under X-ray irradiation, and lays a structural foundation for subsequent catalytic effect enhancement.

The application provides a high-efficiency catalyst for cyclic carbonates, a preparation method and application thereof, and compared with the prior art, the catalyst is prepared from a monoamine-based polyether, a polyamine, a phenolic monomer and formaldehyde, an aminated intermediate is synthesized through a chemical grafting reaction, and then is reacted with an epoxy group quaternary ammonium salt to obtain a supported quaternary ammonium salt catalyst. The catalyst molecular structure comprises a quaternary ammonium salt group, a tertiary amine group, a hydroxyl group and an ether bond structure, can not only play a catalytic effect of the quaternary ammonium salt, but also has a certain complexing effect of oxygen atoms in the tertiary amine group, the hydroxyl group and the ether bond structure, can stabilize the ion pair of the quaternary ammonium salt catalyst, and ensure the catalytic effect of the catalyst. Moreover, the catalyst prepared in the application can be independently used for catalyzing preparation of cyclic carbonates, does not need a cocatalyst, and has high catalytic efficiency and good stability.

The present invention discloses a mutant dual-enzyme catalyst, application and (S)-Bosin synthesis method, relating to the field of bioengineering technology, the present invention is based on the methylglyoxal reductase GRE2 (A) of Candida glabrata and the phosphite dehydrogenase PTDH of methylotrophic bacteria as sources for transformation, and its mutants are screened, the key residues affecting the enzymatic properties of the initial methylglyoxal reductase and phosphite dehydrogenase are determined, and methylglyoxal reductase mutants and phosphite dehydrogenase mutants with high activity are obtained. The present invention utilizes the two most efficient mutants to catalyze the reaction of preparing (S)-Bosin from β-acetone xyloside in a 22T reaction system, with good catalytic effect, overall catalytic efficiency is increased by about 43%, and cost is reduced by about 8%.