107 results about "Dimethyl sulfide" patented technology

The invention relates to the technical field of environmental science, in particular to a box-type model-based inversion method for methane sulfonic acid particles in marine droplet aerosol, which comprises the following steps of: 1, acquiring satellite remote sensing data, ground observation data and laboratory simulation data, and carrying out data standardization processing; 2, dividing the target sea area into a plurality of sub-areas as independent box bodies; 3, calculating the discharge flux of the marine droplet aerosol based on the dimethyl sulfide concentration and the wind speed, and updating the spatial and temporal distribution of the discharge source; 4, embedding a chemical reaction path for oxidizing dimethyl sulfide on the surface of the aerosol into the box-type model to generate methanesulfonic acid, and introducing the specific surface area of the aerosol to correct the reaction rate; and step 5, outputting spatio-temporal distribution of the concentration of the methane sulfonic acid, and comparing measured data for verification. The accuracy of aerosol source item estimation is improved, the fusion efficiency of multi-source data is improved, and the adaptive capacity of the model in a complex environment is enhanced.

The invention discloses a synthesis method of 7-dehydrocholesterol and derivatives thereof, which comprises the following steps: cooling a compound (I), cuprous bromide and dimethyl sulfide compound under the protection of inert gas to obtain a reaction system, adding a Grignard reagent (II) or a Grignard reagent (III), stirring, reacting at room temperature, carrying out heating reaction, and cooling to obtain the 7-dehydrocholesterol. Performing post-treatment to obtain a product; if the product is the Grignard reagent (II), the product is 7-dehydrocholesterol and the derivative thereof; if the reagent is the Grignard reagent (III), the product is 25-hydroxy-7-dehydrocholesterol and the derivative thereof. The method is high in total yield, mild in reaction condition, simple in process route, high in product purity, low in three-waste generation amount, simple in post-treatment, environment-friendly and low in equipment requirement, the purity of 95% or above can be obtained through simple recrystallization, and conventional chemical equipment can be used for production.

The invention relates to the technical field of tetramethyltin synthesis, in particular to a high-efficiency tetramethyltin synthesis process which comprises the following steps: S1, material selection and preparation: selecting corresponding raw materials according to tetramethyltin synthesis requirements, dividing the raw materials into main materials, auxiliary materials and additives, and subsequently weighing the raw materials by using a weighing device; s2, material pretreatment: adding the weighed main material into a dehydration device, starting the dehydration device to carry out dehydration treatment, detecting after dehydration is finished, and taking out the dehydrated main material when a detection result meets a standard; by introducing the double-stage design of low-temperature catalytic methylation and gradient heating reaction and combining a dimethyl sulfide catalytic system to replace a traditional iodine initiator and magnesium powder dynamic equilibrium mechanism, the reaction heat release rate is greatly reduced, the temperature in the whole reaction process is kept in a constant range, the material flushing or explosion risk caused by local overheating is thoroughly eliminated, and the product quality is improved. And intrinsically safe production is realized.

The invention discloses asphalt-based hard carbon, a preparation method thereof and a sodium-ion battery negative electrode material, and relates to the technical field of sodium-ion batteries. The preparation method of the asphalt-based hard carbon comprises the following steps: S1, mixing an asphalt precursor, a sulfur source and a cross-linking agent, and performing cross-linking vulcanization treatment at a first temperature to obtain a primary product; s2, performing carbonization treatment on the primary product at a second temperature to obtain asphalt-based hard carbon; the sulfur source is any one of elemental sulfur, thiourea, dimethyl sulfide and sulfide, or any two of elemental sulfur, concentrated sulfuric acid, thiourea, dimethyl sulfide and sulfide. By adopting the method, the type of the sulfur source is controlled, and the sulfur source and the cross-linking agent are added, so that the reversible capacity and the rate capability of the asphalt-based negative electrode material can be effectively improved, and the application field of the asphalt-based negative electrode material is widened.

A dimethyl sulfoxide synthesis system and a synthesis method, the system comprising: a fixed bed reactor (2) used to synthesize dimethyl sulfide, and an oxidation reactor (4) used to synthesize dimethyl sulfoxide. An external intensification unit (9) is disposed outside the oxidation reactor (4), the external intensification unit (9) comprising a first intensification reactor (901) and a second intensification reactor (902), the first intensification reactor (901) being disposed above the second intensification reactor (902), the first intensification reactor (901) being connected to a discharge port at a bottom end of the fixed bed reactor (2), the second intensification reactor (902) being connected to a nitrogen dioxide or oxygen storage tank (13), a connecting pipe (903) being disposed between the first intensification reactor (901) and the second intensification reactor (902), and a static mixer (904) being disposed in the connecting pipe (903).

The invention discloses a process and a device for recycling nitrogen dioxide, which are characterized in that degassed crude dimethyl sulfoxide is used as a raw material, nitrogen dioxide is absorbed by two stages of crude dimethyl sulfoxide and enters a micro-channel reactor to be used as a catalyst for oxidizing dimethyl sulfide, and recycling is realized. The device comprises a tail gas absorption unit, a microreactor unit, a heat exchanger unit and a separator unit, the technology adopts a dimethyl sulfoxide low-temperature absorption technology, and has the advantages of cyclic utilization of nitrogen oxides, energy conservation and emission reduction, convenience in operation, greenness, high efficiency and the like.

The invention relates to the technical field of organic sulfide preparation, in particular to a method for synthesizing and refining dimethyl sulfide (DMS) and dimethyl sulfoxide (DMSO) embedded into a methanol plant, which mainly utilizes high-purity oxygen of an air separation unit of the methanol plant, a high-concentration hydrogen sulfide product of low-temperature methanol washing and part of top gas-phase refined methanol of a pressurizing tower of a methanol rectification device. The production cost of the product is reduced, the added value of the product is improved, and the hydrogen sulfide product of a methanol plant is effectively utilized.

The invention belongs to the technical field of preparation of adsorption separation functional materials, and discloses a controllable preparation method and application of an S-COFs nanosheet adsorbent. According to the method, 2, 5-dimethyl sulfide terephthalaldehyde DMTTPA and 1, 3, 5-tris (4-aminophenyl) benzene TAPB are taken as monomers, cyanobenzene is taken as a reaction solvent, benzoic acid is taken as a catalyst, aniline is taken as a competitor, and the high-crystallinity S-COF adsorbent is controllably prepared under the condition of high temperature by accurately regulating and controlling crystallization time and combining a dialysis purification technology. The method not only realizes controllable morphology, but also greatly improves the adsorption performance. The method has important economic value in the field of precious metal recovery, the problems of precious metal resource waste and environmental pollution in electronic waste can be effectively solved, and meanwhile, a new thought is provided for designing a low-cost high-performance adsorbent.

The invention provides an anti-temperature interference core-sheath structure strain sensing fiber and a preparation method thereof, and relates to the technical field of composite materials, the fiber comprises a flexible core layer and a conductive shell layer coating the flexible core layer; wherein the flexible core layer is prepared by mixing thermoplastic polyurethane and DMF (Dimethyl Formamide); the conductive shell layer is prepared by mixing thermoplastic polyurethane, DMF (Dimethyl Formamide), a silver nanowire and a multi-walled carbon nanotube, and the mass ratio of the silver nanowire to the multi-walled carbon nanotube is (0.12-0.15): (0.05-0.1). The excellent temperature interference resistance is realized in a wide temperature range (0-60 DEG C) by regulating silver nanowires with positive resistance temperature coefficients and multi-walled carbon nanotube materials with negative resistance temperature coefficients, the resistance temperature coefficients reach 300 ppm / DEG C, and meanwhile, the fiber is endowed with excellent elasticity by the core-sheath structure. Continuous production is achieved through wet spinning, efficiency is high, and cost is low.

The utility model discloses a thin film evaporation device for removing dimethyl sulfide, which comprises a thin film evaporation container main body, the top of the thin film evaporation container main body is provided with a feed port, and the top of the right side of the thin film evaporation container main body is provided with a steam heating external connection pipe used for being externally connected with a steam heater; and a film mesh is arranged in the film evaporation container main body. According to the utility model, the dimethyl sulfide material is spread on the film mesh through the rotating scraper blade to form a film so as to promote evaporation, and the thickness of the film scraped by the scraper blade can be adjusted according to the viscosity of the material and the change of the raw material, so that the situation that the evaporation efficiency is influenced by the too thick or too thin dimethyl sulfide material in the prior art is avoided; and the structure is simple, and adjustment is convenient, so that the scraper blade can flexibly adjust the thickness of the film according to actual changes, the adaptability in evaporation use is improved, and the use requirement for accurate removal of dimethyl sulfide is greatly met.

The present invention relates to the field of lithium-ion battery technology, and more particularly to an electrolyte, a preparation method thereof, an injection method, and a lithium-ion battery. The electrolyte comprises a first electrolyte for a first injection and a second electrolyte for a second injection. The first electrolyte comprises a first solvent, a first lithium salt, and a first additive, and the second electrolyte comprises a second solvent, a second lithium salt, and a second additive. The second electrolyte accounts for 5% to 20% of the electrolyte by mass, the first additive comprises dimethyl sulfide and vinylene carbonate, and the second additive comprises triphenyl phosphite and vinylene carbonate. By including dimethyl sulfide in the first additive and triphenyl phosphite in the second additive, the electrolyte improves the problems of high-temperature gassing and black spots at the negative electrode interface during use of lithium-rich material lithium supplements.

The invention discloses a production device for producing dimethyl sulfoxide by using a micro-channel reactor and application of the production device, and belongs to the technical field of dimethyl sulfoxide production. The production device for producing dimethyl sulfoxide by using the micro-channel reactor comprises a refined thioether buffer tank and a hydrogen peroxide buffer tank, the refined thioether buffer tank is connected with a sulfoxide reaction device through a pipeline, a rectified ether feeding pump is mounted on the pipeline between the refined thioether buffer tank and the sulfoxide reaction device, and the hydrogen peroxide buffer tank is connected with the refined thioether buffer tank through a pipeline between the refined thioether buffer tank and the sulfoxide reaction device. The hydrogen peroxide buffer tank is connected with the sulfoxide reaction device through a pipeline, and a hydrogen peroxide feeding pump is mounted on the pipeline between the hydrogen peroxide buffer tank and the sulfoxide reaction device. According to the production device for producing dimethyl sulfoxide by using the micro-channel reactor, mixing, heat exchange and reaction are integrated by using the micro-channel reactor, so that dimethyl sulfide and hydrogen peroxide are fully mixed, reaction heat is removed while the reaction is rapid, and the reaction is better controlled.

The invention relates to the technical field of preparation of deuterated dimethyl sulfoxide, and provides a catalyst for preparing deuterated dimethyl sulfoxide, application of the catalyst and a preparation method of deuterated dimethyl sulfoxide, and the catalyst is a highly crystallized MOF material (ZIF-7)-on-(Co-BTC); the preparation method of the deuterated dimethyl sulfoxide comprises the following steps: (1) taking deuterium gas and sulfur as raw materials to react at high temperature, and then cooling to room temperature to obtain deuterium sulfide; (2) taking the deuterium sulfide obtained in the step (1), deuterated methanol and gamma-Al2O3 as raw materials, and reacting at high temperature to obtain deuterated dimethyl sulfide; (3) the deuterated dimethyl sulfide obtained in the step (2) is used as a raw material, in the presence of a (ZIF-7)-on-(Co-BTC) catalyst, oxygen and nitrogen dioxide, deuterated dimethyl sulfoxide is obtained through oxidation, and then high-purity deuterated dimethyl sulfoxide is obtained through rectification; the high-purity and large-scale production of the deuterated dimethyl sulfoxide can be met, and the deuteration degree of the deuterated dimethyl sulfoxide can reach 99.8% or above.

The invention relates to a combined structure of small-diameter tower plates, which is mainly used for liquid collection, distribution and mass transfer processes, and is particularly suitable for synthesis and refining processes of dimethyl sulfide (DMS) and dimethyl sulfoxide (DMSO). The device comprises a tray (1), an upper flange (2), a clamping piece (3), a lower flange (4), a tubular distributor (5) and a packed bed layer limiter / distribution guide plate (6) from top to bottom, the tower tray (1) adopts a radial flow design, and liquid descends from the middle to flow towards the periphery and then flows from the periphery to the middle; and the tubular distributor (5) and the packed bed layer limiter / distribution guide plate (6) are combined into a whole. According to the small-diameter tower plate structure, the mass transfer efficiency is remarkably improved.

The utility model relates to the technical field of wine liquid production, in particular to deodorizing spirit distillation equipment which comprises a distillation copper pot, a condenser and at least one maintaining pipe. The distillation copper pot is used for distilling the wine liquid into wine liquid steam. The condenser is arranged outside the distillation copper pot and located on the downstream portion of the distillation copper pot so as to be used for receiving and condensing wine steam in the distillation copper pot. The maintaining pipe is located between the distillation copper pot and the condenser and used for conveying wine steam in the distillation copper pot to the condenser. The maintaining pipe made of the copper-containing material is arranged between the distillation copper pot and the condenser, and the maintaining pipe is arranged upwards in the vertical direction in a winding manner, so that the reaction time between the wine steam and the copper material is prolonged, the odor carried by components such as dimethyl sulfide in the wine steam is better purified, and the quality of the wine is improved. And various flavor sensory characteristics are added to the spirit.

The invention discloses a tetra-coordinated boron-oxygen heterocyclic compound and a preparation method thereof, and belongs to the technical field of pharmaceutical and chemical intermediates and related chemistry. The method comprises the following steps: by taking a bis (pentafluorophenyl) borane dimethyl sulfide complex [(C6F5) 2BHSMe2] as a boron source, firstly carrying out hydroboronation reaction on the bis (pentafluorophenyl) borane dimethyl sulfide complex [(C6F5) 2BHSMe2] and an eneyne compound to generate a three-coordination alkenyl boron dienophile intermediate in situ, and then carrying out reverse electron demand Diels-Alder reaction on the three-coordination alkenyl boron dienophile intermediate and an acetylenic ketone compound to synthesize a series of tetra-coordination boron-oxygen heterocyclic compounds. The method has the advantages of mild reaction conditions, good selectivity, high yield, wide substrate application range, environmental friendliness, simplicity and convenience in operation and the like, opens up a new way for synthesis of the tetra-coordinated organoboron compound, and has higher application value and social and economic benefits.

The invention belongs to the technical field of organic fluorine chemical industry, and particularly relates to hexafluoropropylene oxide as well as a synthesis method and a synthesis device thereof. The synthetic method of the hexafluoropropylene oxide comprises the following processes: firstly, heating dimethyl sulfide and monochlorodifluoromethane in a solvent for reaction, then adding the obtained intermediate into a sodium hydride solution at 30-50 DEG C for reaction to obtain a reaction solution, finally, adding trifluoroacetyl fluoride into the reaction solution for reaction at 15-30 DEG C, treating the obtained reaction solution, and finally, separating and purifying to obtain the hexafluoropropylene oxide. The hexafluoropropylene oxide is obtained. And recovering the solvent and dimethyl sulfide. The synthesis method of hexafluoropropylene oxide provided by the invention is mild in reaction condition and stable in reaction, the synthesized hexafluoropropylene oxide is high in yield and high in purity, and the invention also provides a synthesis device of hexafluoropropylene oxide, which is low in energy consumption.

The invention discloses a synthesis method of a high-abundance C-13 ethylene oxide compound, which comprises the following steps: (1) carrying out reaction on 13CH3I and diphenyl sulfide to obtain [13C] diphenylmethyl iodide; and (2) reacting the [13C] diphenylmethyl iodide with a carbonyl compound to obtain the high-abundance [13C] ethylene oxide compound. Diphenyl sulfide is adopted to replace dimethyl sulfide, the obtained [13C] methyl diphenyl sulfonium iodide avoids C-13 loss in the subsequent reaction process, and the abundance of C-13 is effectively improved.

The present invention relates to a solid malt extract spray freeze-drying device capable of reducing the content of dimethyl sulfide, which comprises an atomization system, a refrigeration system, a vacuum freezing system, a heating system and a control system. The atomization system includes an air compressor, a pressure atomizer, a pressure vessel and a material container. The air compressor is connected to the pressure vessel through a pressure transmission pipeline, and the pressure atomizer is connected to the pressure vessel through a material feeding pipeline. The refrigeration system includes a refrigerator, a condenser, a fan and a separation dust collector. The condenser and the fan are connected to the drying chamber through a cold air circulation pipeline. The vacuum pump of the vacuum system is connected to the drying chamber through a cold trap. The heating system is a heating partition plate and an electric heater at the bottom of the drying chamber. The preparation device of the present invention can remove the bad volatile sulfide dimethyl sulfide in the wort during the drying process, and prepare a solid malt extract powder with the dimethyl sulfide content completely removed. The reconstituted solid malt extract powder has an excellent flavor.

A method by which an intermediate product of an azole derivative can be produced at a lower cost than known production methods is provided. A method for producing a compound represented by General Formula (IV) includes converting a compound represented by General Formula (II) into the compound represented by General Formula (IV) using (a) dimethyl sulfide and / or dimethyl sulfoxide, and (b) a methyl-LG (an LG is a nucleophilically substitutable leaving group and is selected from the group consisting of a halogen group, an alkoxysulfonyloxy group, an aryloxysulfonyloxy group, an alkylsulfonyloxy group, a haloalkylsulfonyloxy group, and an arylsulfonyloxy group) in the presence of an inorganic base.

The present invention relates to the field of carbon aerogel technology, specifically disclosing a method for preparing a magnetic cellulose-carbon aerogel composite electrode material and its application. Using natural pulp as a precursor, the cellulose hydrogel is prepared via a sol-gel process. This hydrogel is then impregnated with ferric chloride, freeze-dried, and finally pyrolyzed in a tubular furnace to produce a magnetic cellulose-carbon aerogel (CA@Fe3O4) composite material. The magnetic cellulose-carbon aerogel prepared in this invention exhibits high specific surface area, good electrical conductivity, and excellent biocompatibility. Used in microbial fuel cell anodes, it can degrade dimethyl sulfide while converting chemical energy into electrical energy, enabling the renewable utilization of organic matter.

The invention relates to a quantitative analysis method for determining trace dimethyl sulfide impurities in a dimethyl disulfide product, a high performance liquid chromatograph-variable wavelength detector is adopted for analysis, and the specific analysis method comprises the following steps: preparing a standard solution and a sample to be detected; and detecting the components of the sample to be detected by adopting a liquid chromatography system-variable wavelength detector (VWD). Wherein the detection conditions are as follows: a C18 chromatographic column, a quaternary pump and an automatic sampling system are adopted, a mobile phase A is ultrapure water, a mobile phase B is acetonitrile, the flow velocity is 0.8-1.2 mL / min, and the column temperature is 30-40 DEG C. According to the present invention, the strong ultraviolet response of DMDS is inhibited by using the high water phase environment, and the retention behavior and the peak shape of DMS are improved by using the solvation effect of the synergist so as to achieve the efficient separation of the main component and the trace impurity; in actual sample determination, the method successfully detects the residual trace DMS in the industrial grade disulfide, the result is stable and reliable, and the method is suitable for product quality control and process optimization.

The invention discloses a preparation method of composite roasted peanut essence, which belongs to the technical field of essence, and comprises the following steps: preheating peanut oil and caprylic / capric triglyceride; the preparation method comprises the following steps: dissolving ethyl maltol, vanillin, methyl cyclopentenolone, 2, 3, 5-trimethylpyrazine and 2-acetylpyrazine; vanillin propylene glycol acetal, isovaleraldehyde propylene glycol acetal, triethyl citrate, delta-decalactone, delta-dodecalactone and 5-hydroxyethyl-4-methylthiazole are fused to obtain a mixture; dispersing the roasted peanut extract; 2, 3-dimethylpyrazine, 2-methoxyl-5-methylpyrazine and 4-methylthiazole are fused, and then the mixture is subjected to a reaction; the preparation method comprises the following steps: fusing cocaal, dimethyl sulfide, 2-ethyl-3, 5, 6-dimethylpyrazine, 2, 3, 5, 6-tetramethylpyrazine, 2-methylpyrazine, 2-acetylpyridine, 2-methoxy-3. 5. 6-isopropyl pyrazine, 2-methylthio-3-methylpyrazine, isovaleric acid, 1-octylene-3-alcohol, 5-methylfurfural and 3, 4-dimethyl-1, 2-cyclopentanedione; standing is performed; filtering is performed; the fragrance of the roasted peanuts is closer to that of the roasted peanuts which are just taken out of a furnace, and the natural flavor of the roasted peanut essence is increased.

The invention provides a carbon-coated nickel-chromium catalyst with an external sulfur source and a preparation method and application thereof, and the preparation method comprises the following steps: A) dissolving and mixing a nickel source, a chromium source and a carbon source in water, and removing a solvent to obtain a precursor; b) pyrolyzing the precursor in a protective atmosphere to obtain a catalyst precursor; and C) mixing the catalyst precursor with a sulfur source solution to obtain the carbon-coated nickel-chromium catalyst with the additional sulfur source, a sulfur source in the sulfur source solution comprises one or more of dimethyl sulfoxide, thioacetamide, thiourea, dimethyl disulfide, dimethyl sulfide and p-fluorothiophenol. According to the invention, a pre-sulfurization strategy of adding an organic sulfur source is innovatively adopted, so that the catalyst is endowed with low-temperature high efficiency, high selectivity and strong engineering suitability, and a bottom layer support is provided for kiloton-level industrial amplification.

The invention discloses a preparation method of an eprinomectin intermediate oxide. The eprinomectin intermediate oxide is obtained by taking an abamectin hydroxyl protection substance as a starting raw material through oxidation reaction and post-treatment. According to the invention, active manganese dioxide is adopted as an oxidizing reagent, the operation is simple, the generation of peculiar smell of a by-product dimethyl sulfide during dimethyl sulfoxide oxidation in the prior art is avoided, the yield reaches 98.0% or more, the purity of the oxide can reach 95.0% or more, and the content of double-oxide impurities can be controlled to be 0.2% or less.

The invention belongs to the technical field of material synthesis, and particularly relates to calcium dodecahydrododecaborate as well as a synthesis method and application thereof. According to the synthesis method of calcium dodecahydrododecaborate provided by the invention, calcium hydride CaH2, a borane dimethyl sulfide complex and an ether mixed organic solvent react in a reaction kettle to obtain a product, and monoethylene glycol dimethyl ether and tetrahydrofuran cyclic ether are compounded to obtain the ether mixed organic solvent; according to the method, the yield and purity of the product calcium dodecahydrododecaborate are improved, meanwhile, deionized water is used for carrying out solvent exchange on the product and drying is carried out, the purity of the product calcium dodecahydrododecaborate is further improved, efficient synthesis of calcium dodecahydrododecaborate is achieved, industrial preparation is facilitated, high-purity calcium dodecahydrododecaborate is provided, and the method is suitable for industrial production. The method is expected to meet the requirement of solid electrolyte battery commercialization on electrolyte, and solves the technical problem of lack of an efficient synthesis process of calcium dodecahydrododecaborate at present.

The present invention discloses a class of sulfur-containing polyethylene glycol derivatives, a preparation method thereof, and an application thereof in the selective oxidation of alcoholic hydroxyl groups. The derivatives are bis-methylthio polyethylene glycol and bis-methylsulfinyl polyethylene glycol, which are polyethylene glycol-supported methylthio and methylsulfinyl groups. The bis-methylthio polyethylene glycol can replace dimethyl sulfide as an activator in the Corey-Kim oxidation, and an important intermediate compound 2'-benzyloxycarbonyl-4"-oxoazithromycin A for the synthesis of tulathromycin is obtained with a yield of 78.8%; and 2'-benzyloxycarbonyl-4"-oxoazithromycin A is obtained with a yield of 90.3%. 5-O-(tert-butyldiphenylsilyl)-23-oxonimoctine, an important intermediate compound in the synthesis of moxidectin, is prepared using bis(methylsulfinyl)polyethylene glycol (PEG) as an oxidant in the Swern oxidation, replacing dimethyl sulfoxide. The sulfur-containing PEG derivatives of the present invention are low-cost to prepare and can be used in Corey-Kim and Swern oxidations, avoiding the use or production of foul-smelling dimethyl sulfide and providing a green environment for these reactions.

The present invention discloses an oral gas detection method and device for children. The method includes: obtaining an oral gas detection information set of children with different types of health status information; the oral gas detection information set includes a number of oral gas detection information corresponding to each type of health status information; the oral gas detection information includes a hydrogen sulfide content sequence value, a methanethiol content sequence value, and a dimethyl sulfide content sequence value; performing correlation analysis processing on the health status information and the oral gas detection information set to obtain a gas correlation model; analyzing the components of the collected oral gas of children to obtain gas component detection result information; using the gas correlation model to perform identification processing on the gas component detection result information to obtain children's health status information. The present invention realizes the accurate detection of children's physical status through the full detection and feature extraction of children's oral gas information.

The present invention relates to a photocurable composition comprising: - a cyanoacrylate A selected from the group consisting of: n-hexylcyanoacrylate, n-heptylcyanoacrylate, n-octylcyanoacrylate, and mixtures thereof; - a radical photoinitiator; - a metallocene compound; - a compound B selected from boron trifluoride, boron trifluoride etherate, boron trifluoride dihydrate, boron trifluoride ethanol, boron trifluoride methanol, boron trifluoride acetic acid, boron trifluoride butyl ether, boron trifluoride butanol, boron trifluoride propanol, boron trifluoride dimethyl sulfide, boron trifluoride acetonitrile, boron trifluoride tetrahydrofuran, boron trifluoride isopropyl alcohol; - optionally a radical polymerization inhibitor, provided that when the photocurable composition comprises a radical polymerization inhibitor, its weight content is 0.04% by weight or less; wherein the molar content of compound B is greater than or equal to 0.141 mmol per 1 kg of the composition; and wherein the molar ratio metallocene compound / compound B ranges from 2 to 8.

The application discloses a MOFs derived N-rich doped three-dimensional porous Co / NC-D composite material and a preparation method thereof. The method comprises the following steps: adding an organic ligand into methanol and ultrasonically dissolving to obtain an organic ligand solution; adding Co(NO3)2.6H2O, Zn(NO3)2.6H2O and dicyandiamide (DCDA) into methanol and ultrasonically dissolving to obtain a metal salt solution; adding the organic ligand solution into the metal salt solution, stirring, centrifuging, washing and drying to obtain a ZIF-67-D or ZnCo-ZIF-D material; and performing calcination, acid washing, filtering, drying and vacuum drying to obtain the material. Compared with Co / AC, Co / rGO and a material obtained by directly calcining ZIF-67, the material has good dispersity and small Co nanoparticles and a synergistic effect between Co and N species, exhibits excellent performance in catalyzing dimethyl sulfide oxidation under mild conditions and has recyclability and a good application prospect.