93 results about "Electronic effect" patented technology

The invention discloses a method for purifying water by catalyzing ozonation through a nitrogen-fluorine co-doped carbon-loaded cobalt nanomaterial. Co-ZIF-8 and polytetrafluoroethylene (PTFE) are respectively used as a precursor and a fluorine source, and the nitrogen-fluorine co-doped carbon-loaded cobalt nano-catalyst is successfully prepared through an etching synchronous doping strategy. The composite material can be used for catalyzing ozone to degrade organic pollutants in water. Nitrogen doping can promote formation of a metal-nitrogen coordination structure, and decomposition of ozone on the surface of the catalyst is facilitated. Fluorine modification can significantly enhance the hydrophilicity of the composite material and accelerate the solid-liquid reaction of ozone in a solution and a catalyst interface, and the strong electron withdrawing effect of fluorine can effectively adjust the electronic structure of the catalyst and promote the generation of strong oxidizing active oxygen species, thereby achieving efficient and rapid removal of pollutants. The water treatment method solves the problem of low ozone utilization rate in a conventional catalytic ozonation process, has the advantages of high reaction rate and stable treatment effect, and has a good application prospect.

The invention discloses a derivative of a rice bran extract as well as a preparation method and application of the derivative. A C-3 benzoate prodrug system is constructed, the transmembrane absorption efficiency is remarkably improved by optimizing the oil-water partition coefficient, fixed-point slow release of active ingredients is achieved through inflammatory tissue esterase, and high bioavailability and low irritation are both considered. Meanwhile, C-25 fluorine atoms are introduced to serve as biological electron isosteres, and target affinity is enhanced by means of the unique electronic effect and polar hydrophobicity of the C-25 fluorine atoms; spatial conformation is locked through side chain saturation, so that the compound shows anti-inflammatory and tissue repair activity which is obviously superior to that of natural cycloartanol under the same dosage.

The present application relates to a kind of multifunctional saponins molecularly imprinted polymer template molecule, molecularly imprinted polymer and its application, belong to plant component refining technical field.The molecularly imprinted polymer of the present application uses virtual template molecule, the template molecule contains hydrogen bond donor and strong electronic effect, it has good adsorption performance to natural saponins compound molecules such as Jiumu saponin AIII, Jiumu saponin BII, Jiumu saponin BIII, Sanqi saponin R1, ginsenoside Rg1, ginsenoside Rg3, ginsenoside Rh2, Tribulus saponin K, Tribulus saponin D, Platanus orientalis saponin D, Shandeng saponin B, Chonglou saponin I, Chonglou saponin II, Chonglou saponin VI.The virtual template molecule is low in cost, can be used for the large-scale preparation of molecularly imprinted polymer, significantly reduces the extraction cost of natural saponins compound.

The application belongs to the technical field of catalytic synthesis, and particularly relates to application of a Lewis acid-base pair in catalyzing polymerization of functionalizable monomers. Common polymerization methods have poor controllability for polymerization of monomers containing polyene groups, alkyne groups and conjugated diene groups, and the molecular weight of the obtained polymer is uncontrollable at low monomer conversion, and the molecular weight distribution is wide, and crosslinking occurs at high monomer conversion. The application utilizes a specific Lewis acid-base pair, and by adjusting the electronic effect and steric hindering effect of the Lewis acid and the Lewis base, active controllable polymerization of the functionalizable monomers can be catalyzed, and a polymer with a clear structure and containing functionalizable sites is obtained, the molecular weight is controllable, the molecular weight distribution is narrow, the end group structure is controllable, the position and density of the functionalizable sites are conveniently adjusted, an efficient platform is provided for post-modification preparation of functional high molecular materials, and functional high molecular materials are prepared by combining click reaction.

The invention discloses a transition metal catalyst based on a terpyridine ligand, a preparation method and application thereof, and particularly relates to application of the transition metal catalyst in the field of catalyzing copolymerization of olefin and polar monomers, the structural formula of the metal catalyst is shown in the specification, and R1 is selected from any one of a hydrogen atom electron-donating group or a fluorine atom electron-withdrawing group; and R2 is selected from a hydrogen atom electron-donating group. According to the scheme, terpyridyl with excellent coordination capability is used as a ligand to prepare the transition metal catalyst, and the electronic effect of the ligand is regulated and controlled, so that the catalytic performance of the catalyst is optimized, and favorable regulation and control on the catalytic activity, the relative molecular mass and distribution of a polymer, the copolymerization performance and the like are realized.

The invention belongs to the technical field of electrochemical materials, and particularly relates to a cobalt-nickel-iron ternary monatomic monolithic electrode and a preparation method and application thereof. The preparation method comprises the following steps: preparing cobalt-nickel-iron precursor solutions respectively, coating the cobalt-nickel-iron precursor solutions on the front and back surfaces of foamed nickel, and further performing high-temperature calcination in a hydrogen-argon mixed gas atmosphere to form a catalyst which is anchored on a three-dimensional porous foamed nickel substrate and has cobalt-nickel-iron ternary monatomic atoms, and the catalyst is used as an anode for hydrogen production by electrolysis of water for oxygen evolution (OER) reaction. According to the synthesis method, use of an insulating binder is avoided, excellent electron transmission capacity is ensured, electrolyte infiltration and rapid release of oxygen bubbles are greatly promoted through the three-dimensional porous structure, the synergistic electron effect of multi-element metal, the maximum atom utilization efficiency and an ideal mass transmission channel are combined, and the performance of the material is improved. And a solution with great application potential is provided for developing an efficient and low-cost water electrolysis hydrogen production anode.

This invention discloses a zinc-based mixed imidazole ligand metal-organic framework (ZIF) adsorbent material for highly efficient separation of CF4 / N2 and its preparation method. By strategically controlling the ratio of benzimidazole and 2-nitroimidazole ligands, a series of ZIF materials with large specific surface areas and suitable pore structures for adsorbing and separating CF4 / N2 are prepared. The 2-nitroimidazole provides a certain polarization effect to the framework, and its own electron-withdrawing effect and relatively long Zn-N bond length (easily broken) make it suitable as a parent material for ligand exchange. The benzene ring on the benzimidazole provides more adsorption sites for the framework. The metal-organic framework adsorbent material prepared by this invention can achieve highly efficient adsorption of CF4 and selective separation of CF4 / N2, exhibiting excellent performance and significant economic and social benefits.

The application provides application of phosphorus ylide organophosphine as Lewis base in catalysis of polar vinyl monomer polymerization, and belongs to the technical field of polymer synthesis. The application utilizes phosphorus ylide organophosphine as Lewis base, and through Lewis base and Lewis acid synergistic catalysis of polar vinyl monomer polymerization under the cooperation of Lewis acid, realizes active controllable polymerization of polar vinyl monomer by changing steric hindrance and electronic effect of Lewis acid and Lewis base, and can realize active controllable homopolymerization and copolymerization (random copolymerization and block copolymerization) of different polar vinyl monomers. The molecular weight of the obtained polymer increases with the increase of the monomer to catalyst ratio, so that the system can realize the molecular weight of the polymer reaching more than 10 6 g / mol, the measured value of the molecular weight of the obtained polymer is basically consistent with the theoretical value, the monomer conversion rate is 100%, and the initiation efficiency is close to 100%.

The invention provides a bidentate cobalt complex containing an imidazo [1, 2-alpha] pyridine group as well as a preparation method and application of the bidentate cobalt complex, and belongs to the technical field of organic chemical synthesis. The structural formula of the bidentate cobalt complex is shown in the specification, and the preparation method comprises the following steps: carrying out bromination reaction and cyclization reaction on 2-methoxy-6-acetylpyridine to obtain a bidentate ligand with methoxy and imidazo [1, 2-alpha] pyridyl, and carrying out demethylation reaction on the ligand to obtain another bidentate cobalt complex with hydroxyl and imidazo [1, 2-alpha] pyridyl. The imidazo [1, 2-alpha] pyridyl-containing bidentate cobalt complexes are prepared from imidazo [1, 2-alpha] pyridyl-containing bidentate ligands, and the two ligands react with anhydrous cobalt chloride respectively to obtain various imidazo [1, 2-alpha] pyridyl-containing bidentate cobalt complexes. The electron effect of the complex is adjusted by changing substituent groups on imidazo [1, 2-a] pyridine groups, then the activity of the complex in catalytic reaction is adjusted, and the complex can be further applied to hydrosilylation reaction of styrene and has very important application prospects.

The invention discloses a preparation method and application of an electrolytic water anode oxygen evolution catalyst. The method comprises the following steps: dissolving a nickel salt, a molybdenum salt and a sulfur source in water, and adjusting the pH value to be acidic to obtain an electrodeposition electrolyte; a three-electrode system composed of a conductive substrate, a counter electrode and a reference electrode is inserted into the electro-deposition electrolyte and electrified, and the electrolytic water anode oxygen evolution catalyst is electro-deposited on the conductive substrate. The catalyst prepared by the preparation method disclosed by the invention has rich nano structures and electronic effects, and can show relatively high intrinsic catalytic activity; and meanwhile, the catalyst is tightly combined with the conductive substrate, so that the cycling stability of the material in alkaline electrolyte is further ensured. The water electrolysis oxygen evolution reaction catalyst prepared by the one-time electrodeposition method has the advantages of simple process, easiness in scale production, no need of additional addition of a binder, direct in-situ growth on a conductive substrate, and improvement of the binding force of the catalyst and the substrate, so that the charge transfer efficiency and the structural stability are improved, and the method has a good application prospect in water electrolysis anode oxygen evolution.

The application provides a preparation method of a carbon material Ru-based catalyst and application of the carbon material Ru-based catalyst in partial hydrogenation of benzene to cyclohexene. According to the activity test results, the introduction of the carbon material improves the benzene conversion rate and appropriately increases the selectivity of cyclohexene. This is mainly due to the rich functional groups on the surface of the carbon material and the unique electronic effect, which increases the dispersion of the metal Ru and stabilizes the Ru δ+ In the reducing reaction system. The application selects a fixed bed as an evaluation device of the cyclohexene, avoids the problems such as difficult separation of products and catalysts in the traditional autoclave device, is beneficial to continuous production of the cyclohexene and provides certain convenience for subsequent industrial application.

The application provides a Pd-Cu bimetallic supported In2O3-TiO2 catalyst and a preparation method and application thereof, and belongs to the technical field of CO2 hydrogenation to prepare methanol. The catalyst comprises a composite carrier and Pd nanoparticles and Cu nanoparticles supported on the surface of the composite carrier. Pd and Cu are combined to form bimetallic sites in the application, the advantages of the bimetallic sites can be fully exerted, and the reaction activity of CO2 hydrogenation to prepare methanol can be significantly improved through the electronic effect and geometric effect between the metals. The Pd-Cu / In2O3-TiO2 catalyst provided by the application has the advantages of high conversion rate and high catalytic activity in the reaction of carbon dioxide hydrogenation to prepare methanol; wherein, in the process of carbon dioxide hydrogenation, the Pd-Cu / In2O3-TiO2 catalyst can obtain a one-way CO2 conversion rate of 23.5% and a methanol yield of 15.83% at 250 DEG C.

This invention provides an anthracene-based fluorescent material, its preparation method, and its applications. The anthracene-based fluorescent material is as shown in Compound I. The compounds of this invention utilize the electron-donating effect of aromatic amine units such as carbazole and the electron-withdrawing effect of phosphonyl / sulfonyl groups, effectively improving the electron and hole transport capabilities of the molecules. Furthermore, the steric hindrance effect, resulting in a distorted molecular configuration, can suppress intermolecular interactions, thereby reducing the device efficiency roll-off caused by concentration quenching. The thermal exciton mechanism enables these molecules to achieve an exciton utilization rate exceeding that of traditional fluorescent molecules by 25%.

The invention discloses a preparation method and application of a Br and N co-doped cobalt-based monatomic catalyst, and relates to the technical field of preparation of catalytic materials. A zeolite imidazole framework ZnCo-ZIF is selected as a precursor and is pyrolyzed, NH4Br is adopted as a nitrogen source and a bromine source to optimize the prepared conventional cobalt-based monatomic catalyst, and a chemical vapor deposition technical synthesis method is utilized to modify the catalyst, so that the cobalt-based monatomic catalyst is prepared. Through the synergistic effect of short-range regulation and control of a first shell coordination microenvironment of Co and long-range regulation and control of an induced electron effect in a carbon matrix, an electronic structure of a Co site is effectively regulated and controlled, and the intrinsic catalytic activity of the catalyst is improved, so that generation of singlet oxygen and degradation of pollutants are enhanced. Compared with a conventional cobalt-based monatomic catalyst, the prepared catalyst has the advantage that the catalytic performance is remarkably improved. Meanwhile, the prepared catalyst is mild in reaction condition, has excellent acid and alkali resistance, good anti-interference capability and excellent durability, and has wide practical application potential.

The invention provides a catalyst for preparation of methanol by hydrogenation of carbon dioxide and a preparation method and application thereof, a carrier of the catalyst for preparation of methanol by hydrogenation of carbon dioxide comprises a zirconia skeleton carrier of an octahedral cage structure, and active components are loaded on the surface and pore inner walls of the carrier, the zirconium oxide skeleton carrier with an octahedral cage structure can carry out space and electronic regulation and control on a loaded metal active center through a geometric confinement effect and an electronic effect, and the zirconium oxide skeleton carrier is high in reaction selectivity, high in activity and high in stability when being applied to a catalytic reaction for preparing methanol through carbon dioxide hydrogenation, and has an industrial application prospect.

The invention discloses synthesis and application of a pyridine-containing asymmetric alpha-diimine nickel catalyst and application of Lewis acid regulation in olefin polymerization, and belongs to the technical field of olefin polymerization. In the olefin polymerization reaction catalyzed by the diimine nickel catalyst, the Lewis acid plays a very ingenious role of a regulator, and the electronic property and space environment of the active center of the catalyst are changed by introducing the Lewis acid salt, so that the dual regulation of the steric hindrance and the electronic effect of the catalyst is realized; the performance of the catalyst is improved; and the structure of the final polymer is changed. Compared with known alpha-diimine nickel catalysts, the alpha-diimine nickel catalyst has the advantages of high polymerization activity, strong thermal stability and improvement of monomer insertion rate.

The application discloses a kind of hexafluorosilicic acid anion functionalized microporous material and its preparation method and application in adsorption separation olefin / alkane.The microporous material is by metal ion Zn 2+ , inorganic anion SiF6 2‑ And azole organic ligand L are formed by the coordination of static solvothermal reaction polymer, the microporous material with the separation property can only be synthesized using static solvothermal reaction method.The microporous material has high density of anion and azole site, and the structure properties of the material can be controlled by adjusting the solvent type of the reaction, the feeding ratio of anion and azole organic ligand and the type of azole organic ligand.The microporous material obtained by the application can realize the separation of olefin / alkane based on size and electronic effect.

This invention discloses a class of porphyrin-based A-D-A type polymer photovoltaic materials, their preparation methods, and applications. The invention utilizes a porphyrin-DPP system constructed through Sonogashira coupling, placing the donor unit at the center of the A-D-A structure. This A-D-A structure more effectively enhances the intramolecular push-pull electronic effect, promoting intramolecular charge transfer and thus significantly broadening and redshifting the light absorption range of the polymer. Furthermore, the A-D-A structure facilitates more ordered and compact intermolecular stacking, promoting the expansion of π-π conjugation and potentially increasing the carrier mobility of the material. This lays the material foundation for obtaining higher short-circuit current densities and fill factors in devices.

The invention relates to the technical field of catalytic materials, in particular to a heteroatom-modulated diatomic catalyst and a preparation method and application thereof.The preparation method comprises the steps that binuclear metal complex molecules, zinc salt and an organic solvent are mixed, an obtained mixed solution and a 2-methylimidazole solution are stirred and mixed under the dark condition, and a mixture is obtained; and carrying out heat treatment on the obtained composite material to obtain the heteroatom-modulated diatomic catalyst. The method comprises the following steps: introducing a binuclear metal complex molecule containing heteroatoms into MOF in advance, and carrying out further heat treatment to construct a stable diatomic active center in which the heteroatoms participate in regulation on a nitrogen-doped carbon substrate; the introduction of heteroatoms not only can enhance the stability of diatomic sites and prevent agglomeration of the diatomic sites in heat treatment and electrochemical processes, but also can generate a strong catalytic effect through the unique geometric and electronic effects and fine regulation and control of the electronic structure of the binuclear center of the diatoms, thereby significantly improving the intrinsic activity and stability of the diatomic sites to ORR.

This invention relates to the field of catalyst technology, specifically to a twinned palladium catalyst, its preparation method and application, and a method for hydrogenating carboxybenzaldehyde. The twinned palladium catalyst contains palladium and carbon and has a spherical morphology. The spherical shape of the twinned palladium catalyst not only provides abundant surface reaction sites for the hydrogenation reaction, but the synergistic electronic effect caused by the twinned interface also significantly improves the catalyst's activity and stability. When used for the hydrogenation of carboxybenzaldehyde (e.g., p-carboxybenzaldehyde), it has the advantages of high substrate conversion and high catalyst stability.

This invention discloses a chiral oxazoline-pyridine-imine cobalt compound, its synthesis method, and its applications. The synthesis method involves the condensation reaction of 2-cyano-6-acetylpyridine and an aniline derivative with p-toluenesulfonic acid to generate a pyridine-imine compound. This compound is then cyclized with different chiral amino alcohols in the presence of zinc trifluoromethanesulfonate to generate chiral oxazoline-pyridine-imine ligands. The reaction of these ligands with anhydrous cobalt chloride successfully prepared four chiral oxazoline-pyridine-imine cobalt compounds. The cobalt catalyst synthesized in this invention possesses different chiral groups, electronic effects, and steric hindrance, and can catalyze the polymerization of isoprene.

According to the dinuclear metallocene compound, the catalyst and the preparation method and application of the dinuclear metallocene compound, the bridging group with a simple structure is introduced, and the rigidity of the bridging group is reduced, so that two metal centers are close to each other in a spatial distance, a synergistic effect is generated, and balance is achieved in a steric effect and an electronic effect; the activity of the binuclear metallocene compound is improved, the bridging group with a simple structure has small steric hindrance, so that the rotation space is larger, and the insertion rate of a comonomer can be improved.

The invention discloses a method for synthesizing an amino-selenium nitrogen heterocyclic compound through near-infrared light catalysis, according to the method, the amino-selenium nitrogen heterocyclic compound is efficiently synthesized through catalysis of a near-infrared light response type anthraquinone polymer, efficient coupling of an unprotected amino group and a selenium nitrogen heterocyclic ring is successfully achieved, the reaction process is accurately regulated and controlled through photocatalysis, and the yield of the amino-selenium nitrogen heterocyclic compound is improved. The construction of a series of amino-selenium nitrogen heterocyclic compounds is completed under mild conditions. According to the method, the natural reaction activity of amino is reserved, the electronic structure of a heterocyclic skeleton is optimized through the electronic effect of selenium atoms, and a green and sustainable technical solution is provided for functional modification of selenium-containing bioactive molecules.

The invention discloses a nickel-based catalyst for catalyzing ethylene copolymerization to prepare a photoresponse polymer as well as a preparation method and application of the nickel-based catalyst. The method comprises the following steps: under the condition of strict humidity and oxygen control, carrying out coordination reaction on a functionalized phosphono-phenol ligand and a picolyl nickel precursor, controlling the coordination process of a metal center through step-by-step charging, carrying out solid-liquid separation on a reaction mixture, and carrying out gradient crystallization purification by adopting a mixed solvent system to obtain the high-purity nickel complex catalyst. According to the invention, ethylene and an acrylate monomer are catalyzed by a phosphine phenol nickel catalyst with electronic effect regulation and control to carry out copolymerization, and a functional polyolefin material with photoresponse is synthesized. The obtained copolymer can be well combined with dye in the dyeing performance, so that the dyeing process is more uniform and firmer, and wide prospects are provided for application of the copolymer in the industries of spinning, printing and dyeing and the like. And the adhesive force of the material is also effectively improved, so that the polymer has potential application value in the fields of adhesives, coatings and the like.

The invention discloses a CFC-112 hydrogen-assisted dechlorination catalyst and a preparation method thereof, the hydrogen-assisted dechlorination catalyst comprises an active component, a metal additive and a carrier, and the active component and the metal additive are loaded on the carrier; the active component is precious metal Pd, and the mass fraction of Pd is 0.1%-1.0%; the metal additive is selected from at least one of K, Mn, Fe, Co, Ni, Cu, La and Ce, and the mass fraction is 0.5%-5.0%; the carrier is activated carbon, and the activated carbon is selected from any one of coconut shell charcoal, wood charcoal, shell charcoal and coal charcoal. The electronic structure of the active site is regulated and controlled through the electronic effect and coordination effect of the metal additive, and the dispersity of the active component is increased by virtue of a step-by-step impregnation method, so that the catalytic activity and the target product selectivity are improved, and the service life of the catalyst is prolonged; the catalyst shows excellent catalytic activity, selectivity and good chemical stability in the process of preparing 1, 2-difluorodichloroethylene, and has industrial application potential.

The application belongs to the technical field of organic chemical synthesis, and particularly relates to 2,5-dichloro-3-methoxythiophene, a preparation method and application thereof. The 2,5-dichloro-3-methoxythiophene provided by the application is designed by 2,5-position double chloro substitution and 3-position methoxy, which not only retains the advantages of high reactivity and low cost of chlorine atoms, but also is safe, environmentally friendly and economical through the space steric hindrance and electronic effect regulation of the substitution site, and can be used for preparing polythiophene.

The invention provides a metallocene catalyst as well as a preparation method and application thereof, the structural formula of the metallocene catalyst is shown in the specification, R1 and R2 are independently selected from H or alkyl with 1-20 carbon atoms, and R1 and R2 are the same or different; r3 is selected from Cy or tBu; r4 and R5 are independently selected from halogen or alkyl with 1 to 20 carbon atoms, and R4 and R5 are the same or different; m is selected from Ti, Zr or Hf. According to the metallocene catalyst disclosed by the invention, a cyclopentadienyl ring of a thiophene fused ring is bridged with a rigid benzene ring, and the high-temperature resistance and polymerization activity of the catalyst are improved by cooperating with a steric effect of a substituent group on an amino group, the steric effect on the cyclopentadienyl ring and an electronic effect. The catalyst provided by the invention can catalyze ethylene and alpha-olefin copolymerization at high temperature to prepare a polyolefin elastomer with high insertion rate and high molecular weight, and is suitable for industrial production of high-temperature solution polymerization.

The application discloses an olefin polymerization catalyst, which has an acylhydrazone pyrene skeleton structure. By introducing the acylhydrazone pyrene skeleton, the catalyst has improved catalytic activity, and by adjusting the structure and central metal of the catalyst, the spatial and electronic effects of the catalyst are changed, so that the catalyst can be used for preparing polyolefin products with excellent anti-yellowing performance, high glass transition temperature, high stereoregularity and ultrahigh molecular weight. The catalyst based on the acylhydrazone pyrene skeleton has wide application prospects and improves the competitiveness of a polyolefin product technology market in China.

The invention provides a metallocene catalyst as well as a preparation method and application thereof, the structural formula of the metallocene catalyst is shown in the specification, and M is selected from Ti or Zr; x1 and X2 are selected from halogen or alkyl with 1 to 6 carbon atoms, and X1 and X2 are the same or different; r1 to R4 are respectively and independently selected from hydrogen or alkyl with 1 to 2 carbon atoms, and R1 to R4 are the same or different. According to the metallocene catalyst disclosed by the invention, through steric hindrance and an electronic effect on a metallocene ring and a strategy of combining rigidity and softness of a substituent group on amine, the high temperature resistance is improved, and the metallocene catalyst still has relatively high catalytic activity at a high temperature and is simple in synthesis step, easy to separate and purify, high in yield and low in cost. The metallocene catalyst disclosed by the invention can be used for preparing a polyolefin product with excellent performance in an ethylene polymerization reaction, and is suitable for industrial application.

In the present application, the catalyst for preparing polyethylene elastomer, ethylene and co-catalyst are dispersed in organic solvent to carry out polymerization treatment to obtain polyethylene elastomer. The catalyst for preparing polyethylene elastomer provided by the present application is cheap and easy to obtain. The catalyst has a specific molecular structure. In the process of preparing polyethylene elastomer, the unique steric hindrance and electronic effect of the catalyst make it exhibit excellent catalytic activity. The prepared polyethylene elastomer has excellent elasticity and mechanical properties while improving the branching degree and narrow molecular weight distribution. The polyethylene elastomer can be widely applied in the fields of automobile, photovoltaic, medical treatment, packaging and the like to meet the use requirements of high-performance polyethylene elastomer in these fields.