127 results about "Synergistic catalysis" patented technology

This invention discloses a solution-based synergistic catalytic method for preparing post-functionalized polyolefins, belonging to the field of polymer material modification technology. The method includes the following preparation steps: adding polyolefin, graft monomer, and catalyst to an organic solvent, stirring until homogeneous, and heating to react, thereby obtaining the post-functionalized polyolefin; wherein the catalyst is a combination of a first catalyst and a second catalyst; and the first catalyst is selected from tert-butyl nitrite, and the second catalyst is selected from N-hydroxysuccinimide and / or N-hydroxyphthalimide. This invention utilizes a synergistic catalytic system composed of tert-butyl nitrite and N-hydroxysuccinimide and / or N-hydroxyphthalimide to activate the C-H bonds of polyolefins in an organic solvent via a free radical mechanism, thereby grafting polar functionalized graft monomers onto the main chain of various polyolefins.

The application discloses a preparation method of a mesoporous silicon-based composite material with phosphotungstic acid and titanium oxide simultaneously supported, and belongs to the technical field of catalytic material preparation. The method aims to solve the problems of easy aggregation of active components, easy damage of channel order and complex preparation process in the prior art. The method is characterized by the following steps: through a one-step hydrothermal synthesis strategy, a triblock copolymer is used as a structure directing agent, an alcohol solution of a titanium source precursor, a silicon source precursor and a Keggin type phosphotungstic acid is simultaneously added in an acid system, and then the mesoporous silicon-based composite material is prepared through hydrothermal crystallization, washing, drying and calcination. The method is simple in process and controllable in operation, and the obtained material has the following advantages: two-dimensional hexagonal ordered mesoporous structure, large specific surface area, high dispersion of titanium and phosphotungstic acid, intact Keggin structure, good double-acid-site synergistic catalytic effect, and suitability for acid catalytic reactions, especially in the field of biomass conversion.

The application discloses a bifunctional catalyst and a preparation method and application thereof. The bifunctional catalyst comprises an active component and a carrier, wherein the active component is loaded on the carrier; the active component comprises active component I and auxiliary active component II; the active component I comprises metal cobalt, and the auxiliary active component II comprises metal M, and M is selected from iron or tin; the carrier is a composite of silicon oxide and carbon; and the carrier has acid functional groups. The application designs a hydrogenation dehydration catalyst with a bifunctional active site of a layered structure from the microstructure design of a heterogeneous catalyst, utilizes the synergistic catalysis of hydrogenation active metal and dehydration acid functional groups to greatly improve the yield of a target product DBU, and enables the overall reaction process to be carried out under mild conditions (80 DEG C, 2.0 MPa), achieves the yield of DBU (>=95%) and has a stability of >=500 hours.

The method for high-efficiency catalysis of Knoevenagel condensation reaction by a porphyrin and quaternary ammonium salt synergistic catalytic system belongs to the technical field of catalyzing Knoevenagel condensation reaction. The synergistic catalytic system comprises a porphyrin ligand and a quaternary ammonium salt compound. The method for high-efficiency catalysis of Knoevenagel condensation reaction of aldehyde ketone and active methylene to generate methylene malononitrile compounds is to use the porphyrin ligand and the quaternary ammonium salt as a synergistic catalytic system to catalyze the condensation of aldehyde ketone and active methylene to generate methylene malononitrile compounds. The porphyrin ligand and quaternary ammonium salt synergistic catalytic system avoids the disadvantages of environmental pollution and difficult recycling of traditional basic homogeneous catalysts, so that the porphyrin ligand and quaternary ammonium salt synergistic catalytic system is easy to operate and recycle, has universal practicability, can be used by ordinary experimental operators, and provides an easy-to-operate, inexpensive and efficient route for the synthesis of methylene malononitrile compounds, which has a popular prospect.

The application discloses a kind of photothermal synergic catalysis co-pyrolysis system and method of marine organic solid waste, method includes the following steps: waste fishing net, plastic garbage and seaweed are crushed and mixed uniformly according to mass ratio (2-4):(3-5):(1-3);Mixed material and multifunctional composite photocatalyst prepared by seaweed are sent into moving bed reactor according to mass ratio (10-20):1, under the condition of concentrated solar energy leading, electric heating auxiliary, continuous co-pyrolysis is carried out;Pyrolysis product is separated by three-stage condensation to obtain heavy oil, light oil, water and gas.The method realizes the green cycle of "waste treatment", the catalyst cost is low, the degree of system intelligence is high, and provides an efficient, environmentally friendly, economically feasible innovative path for the resource utilization of marine organic solid waste.

This invention belongs to the field of organic chemical synthesis, specifically relating to a 3-amino-2-indolone compound containing a thioacetal skeleton, its synthesis method, and its applications. The synthesis method involves adding aryl-substituted dithioacetal and 1-substituted-3-imino-2-indolone as reactants to an organic solvent. The reaction is carried out under the synergistic catalysis of naphthol phosphate and a Cu metal catalyst at 2-5°C with stirring. The reaction is monitored by TLC until complete, followed by filtration, concentration, and purification to obtain the final product. The 3-amino-2-indolone compound synthesized in this invention possesses potential pharmaceutical activity due to its thioacetal skeleton. The reaction conditions of this invention are relatively conventional, the reaction process is mild, simple, and low-cost, suitable for large-scale industrial production, thus broadening the applicability of this method. A wide variety of substrates are used as reactants, resulting in structurally diverse products with high yields.

The application discloses a method for synthesizing a chiral secondary phosphine oxide with a conjugated dienyl phosphorus center through desymmetrization. The method is that a primary phosphine oxide reacts with an alkyne to obtain the chiral secondary phosphine oxide with the conjugated dienyl phosphorus center under the joint catalysis of zero-valent nickel and a ligand and the action of an additive. The method realizes the preparation of the chiral secondary phosphine oxide with the conjugated dienyl phosphorus center with high enantioselectivity and specific chemical selectivity through the joint catalysis of the zero-valent nickel and the ligand.

This invention relates to a confined pyrolysis-derived axially oxygen-coordinated iron single-atom material with iron clusters, its preparation method, and its applications. It focuses on single-atom catalysts, addressing the technical problems of low activity, poor stability, and poor mass transfer capacity in existing Fe-N-C catalysts. The material consists of a spherical conductive substrate and axially oxygen-coordinated iron single atoms and iron clusters supported on the substrate. Preparation: A bifunctional silica template strategy is employed, using an inner layer of silica as a sacrificial template to construct a cavity structure and provide axial coordination. An outer layer of silica is used to maintain a reducing atmosphere. Through the synergistic effect of confined pyrolysis and template etching, the specific surface area of ​​the material is increased, and the exposure of active sites is enhanced, achieving synergistic catalysis of iron single atoms and iron clusters. This material exhibits a half-wave potential of 0.91 V in 0.1 M KOH and decays by only 2 mV after 10,000 cycles. It can be used in the field of electrocatalysis.

The application discloses a method for synthesizing an alpha-position chiral nitrogen heteroaromatic ring under the synergistic catalysis of a chiral phosphoric acid and a Lewis acid, and the method comprises the following steps: taking a nitrogen heteroaromatic ring olefin I as an electrophilic reagent, taking an aryl alkyl boronic acid II as a carbon nucleophile, and under the synergistic catalysis of a Lewis acid catalyst and a chiral phosphoric acid catalyst, in the presence of an organic solvent, an additive and a proton source, performing a conjugate addition-asymmetric protonation reaction to generate an alpha-position chiral nitrogen heteroaromatic compound shown in formula V, and the reaction is shown as follows: The application provides a conjugate addition-asymmetric protonation strategy for a nitrogen heteroaromatic ring olefin, which is synergistically catalyzed by a chiral phosphoric acid and a Lewis acid (Fe(OTs)3) and involves an organic boron reagent, a series of alpha-position chiral nitrogen heteroaromatic compounds are successfully synthesized by using the catalytic system, the highest enantioselectivity reaches 98% ee, and good universality is shown for aryl, heterocyclic and polysubstituted substrates, and the bottleneck problem of low reactivity of 1,1-disubstituted substrates in a traditional method is effectively overcome.

This invention belongs to the fields of industrial hazardous waste resource utilization, photothermal synergistic catalytic materials, and VOCs treatment technology. Specifically, it relates to a VN / GaN aerogel photothermal catalyst based on in-situ vanadium nitridation of spent SCR catalyst, its preparation method, and its application. The preparation method includes: selectively leaching vanadium from spent SCR denitrification catalyst; using vanadium-containing DES leachate directly as a vanadium source and spinning aid, compounding it with gallium nitrate and the spinning aid to prepare an electrospinning precursor solution; obtaining precursor fibers through electrospinning; calcining in air to obtain V2O5 / Ga2O3 nanofibers; high-temperature nitriding with ammonia to form VN / GaN composite nanofibers; and ultrasonic dispersion, aging, and freeze-drying to prepare the aerogel photothermal catalyst. This invention achieves green, high-value, closed-loop utilization of vanadium in hazardous waste, and the prepared aerogel catalyst possesses both excellent photothermal conversion performance and toluene catalytic oxidation activity.

This invention discloses a one-stage treatment method for sintering flue gas; the reactor used includes a heat exchanger, a hot blast furnace, and a reaction device; the heat exchanger is provided with an inlet channel and an outlet channel. The heat exchanger is used to exchange the heat of the gas passing through the outlet channel to the inlet channel. The inlet channel of the heat exchanger, the hot blast furnace, the reaction device, and the outlet channel of the heat exchanger are connected in sequence. The reaction device is equipped with a Ce-Mn-based catalyst. The temperature of the input sintering flue gas is 160℃~220℃; the volume ratio of nitrogen oxides to carbon monoxide is 1:(10~20); and the gas hourly space velocity is 50000h. ‑1 ~60000h ‑1 This invention achieves multifunctional coupling of catalytic units through a single-stage synergistic catalysis process, completing the removal of CO and nitrogen oxides (NOx) from sintering flue gas in the same reactor. x The treatment of sintering flue gas reduces the cost of sintering flue gas treatment.

The application discloses polylactic acid-polycaprolactone degradable woven bag non-woven fabric and a preparation method thereof. The non-woven fabric is prepared from the following components: polylactic acid, polycaprolactone, sodium lauryl sulfate, dopamine-modified nano-titanium dioxide composite, a compound system of citric acid and epoxy soybean oil, a combination of sodium carboxymethyl cellulose and calcium dodecyl phosphate, and a combination of montmorillonite and D-isoascorbic acid palmitate. The above system forms a multi-level degradation regulation network structure with surface interface regulation, intermediate layer microstructure regulation and nano functional particle synergistic catalysis, and realizes controllable regulation of the degradation rate of polylactic acid-polycaprolactone blended materials. A preparation method is used to prepare the non-woven fabric. The application has the following beneficial effects: the problems of the prior art, such as difficult accurate regulation of the degradation rate of polylactic acid-polycaprolactone blended materials, poor environmental adaptability and limited application scenarios, are solved.

The application relates to the technical field of electrocatalytic reduction of carbon dioxide, and provides a preparation method and application of a zinc-iodine diatomic pair (Zn-I / ICPs) carbon dioxide electro-reduction catalyst. The zinc-iodine diatomic pair is prepared by using nitrogen-doped carbon as a carrier and an in-situ gas-capturing MOF method, and the specific steps are as follows: first, ZIF-8 precursors are prepared by using zinc nitrate hexahydrate and 2-methyl imidazole as raw materials; then, the ZIF-8 and potassium iodide are co-pyrolyzed under a nitrogen atmosphere, the potassium iodide is used as an iodine source, zinc and iodine atoms are combined in an atomic dispersion form through a gas-phase doping mode, and a Zn-I diatomic pair is formed. The preparation method is simple and controllable, in the prepared Zn-I / ICPs, Zn sites and I sites successfully construct a synergistic catalytic center with complementary functions and electronic coupling, can effectively control an electrochemical microenvironment, accelerate water dissociation and proton transfer, and simultaneously highly effectively inhibit a hydrogen evolution side reaction, and the zinc-iodine diatomic pair can catalyze carbon dioxide electro-reduction to prepare carbon monoxide with high activity and high selectivity.

This invention discloses a mesoporous silica-based composite material with phosphotungstic acid simultaneously immobilized with titanium oxide and its cellulose hydrolysis method, belonging to the field of biomass catalytic conversion technology. This invention aims to solve the problems of easy desorption of active components, low catalytic efficiency, and poor cycle stability in existing solid acid catalysts during cellulose hydrolysis. This method uses an ionic liquid as the reaction medium and a titanium-silicon-supported phosphotungstic acid composite material with a two-dimensional hexagonal ordered mesoporous structure prepared by a one-step hydrothermal synthesis as the solid acid catalyst, catalyzing the hydrolysis of cellulose to reduce sugars in the presence of water. This invention achieves highly efficient cellulose conversion through the synergistic catalytic effect of the two acid sites combined with the good solubility of cellulose in the ionic liquid. The catalyst exhibits excellent recyclability, the process conditions are well-defined, it meets the requirements of green chemistry, and it is applicable to the field of biomass resource utilization.

The application discloses polyurethane foam with high sound absorption coefficient and a preparation method thereof, and relates to the technical field of polyurethane foam materials. The polyurethane foam is prepared by the reaction of component A and component B. The component A comprises the following raw materials in parts by weight: polyether polyol 45-55 parts, polymer polyol 35-40 parts, amine catalyst 0.01-0.03 parts, pentamethyl dipropylene triamine 0.5-2.0 parts, tin catalyst 0.01-0.03 parts, water 1-3 parts, pore opener 3-4 parts, and mixed silicon oil 1.2-1.6 parts. The component B is diphenyl methane diisocyanate, and the amount of the component B is 70-90 parts by weight. By introducing pentamethyl dipropylene triamine as a synergistic catalyst in a specific amount, the foam pore structure and the open porosity of the foam can be significantly optimized, and the prepared polyurethane foam has significantly improved sound absorption performance in the medium and low frequency range.

This invention discloses a rare-earth element-containing cationic catalyst, its preparation method, and its application, belonging to the field of catalyst technology. Using 732 polystyrene sulfonic acid resin as a support, the target catalyst is prepared in four steps: pretreatment, zirconium coordination modification, aminobisphosphonic acid ligand grafting, and rare-earth ion chelation loading. This invention constructs a Brønsted-Lewis dual-acid synergistic catalytic system through directional structural design, achieving both ultra-stable rare-earth loading and retention of strong acidic sites, significantly improving the catalyst's water resistance, catalytic activity, and cycle stability. This catalyst can efficiently catalyze the synthesis of polyoxymethylene dimethyl ether from industrial formaldehyde aqueous solution and methyl acetal, exhibiting excellent formaldehyde conversion and target product selectivity. It is suitable for both batch and continuous production processes and has good prospects for industrial application.

This invention provides a chlorine atom transfer addition product and its preparation method, wherein the general structural formula of the chlorine atom transfer addition product is as follows. The preparation method includes: dissolving a copper salt, a phosphine ligand, and a nitrogen ligand in a solvent, stirring under a nitrogen atmosphere to obtain a mixture; subsequently adding an inert chlorinated derivative and an alkene to the mixture and reacting under light; after the reaction is complete, drying and vacuum concentrating to obtain a crude product; and separating the crude product by column chromatography to obtain the chlorine atom transfer addition product; wherein the molar ratio of the alkene to the copper salt, phosphine ligand, and nitrogen ligand is 1:(0.01-0.15):(0.01-0.1):(0.01-0.1). This method achieves a balance between structural diversity and synthetic efficiency through the synergistic catalysis of the copper salt, phosphine ligand, and nitrogen ligand. The structure of the obtained chlorine atom transfer addition product provides a rich molecular framework for drug design, making it promising for applications in medicine, materials, and other fields.

This invention discloses a ZnCoSe / NC bifunctional catalyst, its preparation method, and its applications, belonging to the field of electrocatalytic materials technology. Addressing the technical problems of insufficient catalytic activity and limited active site types in existing transition metal selenide electrocatalysts, the catalyst prepared in this invention comprises a nitrogen-doped carbon support, ZnSe and CoSe particles supported on the support, and Co single atoms dispersed within the support. By rationally controlling the proportions and interfacial structures of each component, a highly efficient synergistic catalytic system is constructed. The ZnCoSe / NC catalyst exhibits excellent ORR performance, and the current retention rate remains at 97.6% after a 10-hour stability test; it also demonstrates competitive oxygen evolution reaction (OER) activity. This invention develops a high-performance, low-cost ORR / OER bifunctional electrocatalyst, providing new ideas and methods for the design and preparation of non-noble metal-based bifunctional catalysts.

This invention discloses a continuous preparation method for supported nickel-based catalysts and their applications. This method utilizes the precise microporous structure of a membrane-dispersed microreactor to achieve efficient and uniform mixing of the active component (Ni metal) and the promoter (Ce) with the support precursor. By precisely controlling key parameters such as pH and flow rate, the nucleation and growth processes are controlled, enabling the continuous preparation of nanoscale bimetallic catalysts. This shortens the preparation time and makes the process more environmentally friendly and efficient. The catalyst prepared by this invention fully leverages the synergistic catalytic effect between the nickel and cerium components. Under mild reaction conditions, it exhibits excellent catalytic activity and stability in the debenzylation reaction of N-benzylaniline, achieving a conversion rate of up to 95% and a selectivity greater than 99%, demonstrating promising prospects for industrial application.

The application provides an integrated ceramic filter tube and a preparation method and application thereof. The integrated ceramic filter tube comprises a base body having a cavity structure, a pipe wall of the base body being formed by fiber lapping, and a high-entropy active component dispersed on the surface and / or inside of the pipe wall, and the high-entropy active component comprises metal oxides formed by five or more transition metals. The integrated ceramic filter tube breaks through the traditional segmented processing mode of dust removal first and catalytic purification later, integrates the functions of particulate matter capture and NO x , VOCs catalytic degradation into a single ceramic filter tube, and can simultaneously remove dust, nitrogen oxides and volatile organic compounds in industrial flue gas such as coking, steel and cement. The design simplifies the industrial tail gas treatment process, reduces the equipment area and system pipeline connection cost, reduces the difficulty of engineering transformation of the industrial end, and realizes efficient and collaborative removal of multiple pollutants.

The application provides a fly ash-based chromium-cerium loaded hollow ZSM-5 molecular sieve catalyst and a preparation method and application thereof, and relates to the field of catalysts. The preparation method comprises the following steps: mixing water, fly ash and sodium hydroxide, stirring, activation treatment, solid-liquid separation and drying to obtain primary zeolite; mixing the primary zeolite, sodium hydroxide and water, stirring, adding tetrapropylammonium hydroxide and stirring, adding silica sol and stirring, adding crystal seeds and stirring, hydrothermal reaction, solid-liquid separation, drying, calcination; mixing ZSM-5 molecular sieve and tetrapropylammonium hydroxide, hydrothermal reaction, solid-liquid separation, drying, calcination, and then ion exchange with an ammonium nitrate aqueous solution to obtain hollow ZSM-5 molecular sieve; and mixing a chromium source, a cerium source and the hollow ZSM-5 molecular sieve, aging, drying and calcination. The catalyst provided by the application has excellent catalytic performance in the aspects of synergistic catalytic oxidation of chlorinated aromatic hydrocarbons and mercury.

The application discloses a preparation method of a benzoxathiazinone derivative and belongs to the technical field of organic synthesis. The method uses benzodisulfone and an epoxide compound as reaction raw materials, and under the action of a catalytic system composed of lanthanum nitrate hexahydrate and tributyl phosphine, potassium carbonate is used as an alkali, acetonitrile is used as a solvent, and the reaction is carried out under heating, and then column chromatography is used for separation and purification, so that the target seven-membered sulfur heterocyclic compound is obtained. The synergistic catalytic mechanism formed between the lanthanum nitrate hexahydrate and the organic phosphine effectively overcomes the problem of the regioselective ring opening of the epoxide compound, and realizes the efficient and high-selectivity cyclization of the benzodisulfone and the epoxide compound. The synthetic route has mild reaction conditions, does not need inert gas protection, is simple in operation, and has good functional group compatibility, and provides an efficient and practical technical path for constructing novel benzoxathiazinone derivatives.

The application discloses a kind of iron silver diatomic catalyst based on ligand complexation effect construction and its preparation method and application, belong to material science and environmental engineering technical field;The method utilizes the difference between iron, silver atom and o-phenanthroline, ethylenediamine tetraacetic acid disodium ligand complexing rate and capacity, optimizes the adding order of ferric nitrate and silver nitrate, accurately controls the complexation mode of metal atom and ligand oxygen / nitrogen atom;And further with the directional assembly and melting point reduction effect of intermolecular hydrogen bond, successfully prepare the diatomic catalyst that iron silver atomic spacing and coordination configuration can be controlled;The design essentially strengthens the synergistic catalysis of iron silver double site, realizes the cascade activation of peroxymonosulfate internal oxygen atom, and then generates singlet oxygen with high yield and high output;The application provides an efficient new material and feasible new technical scheme for the advanced treatment of typical phenolic and antibiotic wastewater.

This invention provides a method for the synergistic catalytic thermal decomposition of ammonium perchlorate (AP) based on metal fuels. The method employs a pre-prepared composite metal fuel (C / M), where C is a low-melting-point fuel metal (such as Al, B, etc.) and M is a highly catalytically active metal (such as Ni, Cu, etc.). By uniformly mixing the above fuel with AP in a specific ratio, during heating, the fuel not only provides the heat of reaction as a high-energy fuel, but also, the transition metals and their potentially in-situ generated metal derivatives within it, work synergistically with the low-melting-point metal component to significantly reduce the high-temperature decomposition temperature of AP, greatly increase its decomposition reaction rate, and lower its apparent activation energy. The method described in this invention is simple, has significant catalytic efficiency, and good safety, showing promising application prospects in solid propellant formulations and providing effective technical support for improving propellant combustion performance.

The present application provides a kind of high C 2+ The application discloses a preparation method, product and application of a selective carbon dioxide electro-reduction catalyst Ag / AgBr / Cu2O. The preparation method adopts a one-pot solvothermal reduction method, and by controlling the reaction conditions, silver species is synchronously generated in the form of metallic silver and silver bromide and firmly combined with a cuprous oxide substrate. The method route is simple, the reaction conditions are mild, and the product is controllable. When the obtained catalyst is applied to a carbon dioxide electro-reduction reaction, the introduction of Ag and the doping of Br in the catalyst produce a synergistic catalytic effect, effectively promote the C-C coupling path, and significantly improve the C 2+ product selectivity, the C 2+ product faraday efficiency reaches 82.7%, and the local current density reaches 121.7 mA·cm ‑2 -2. At the same time, the hydrogen evolution side reaction is effectively inhibited. The research provides a new idea for designing a high-performance CO2 conversion catalyst, and has important scientific value and industrial application potential.