506 results about "Metallic catalyst" patented technology

The application belongs to the technical field of batteries, and particularly relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The method comprises the following steps: preparing a porous carbon fiber membrane loaded with a metal catalyst; preparing a dispersion solution of a nano-silicon-based material, and distributing the nano-silicon-based material into the porous carbon fiber membrane to obtain a composite porous carbon fiber membrane; and performing thermal chemical vapor deposition on the composite porous carbon fiber membrane in an inert atmosphere containing a carbon source, growing carbon nanofibers and vertical graphene on the surface of the composite porous carbon fiber membrane, and obtaining a silicon-carbon negative electrode material. Through a synthesis route of thermal chemical vapor deposition (T-CVD), the synthesis process is optimized, and a multi-level three-dimensional network structure of carbon nanofibers and vertical graphene is constructed to enhance the electrical conductivity of the silicon-carbon negative electrode material, accelerate carrier transmission, improve the interface contact performance between the silicon-based material and the carbon material, improve the loading capacity of the nano-silicon-based material, inhibit the volume expansion of the nano-silicon-based material, and improve the structure and cycle stability of the nano-silicon-based material.

The invention discloses a method for preparing 1, 3-propylene glycol by hydrating and hydrogenating acrolein, which comprises the following steps: carrying out hydration reaction by taking an acrolein aqueous solution as a raw material and taking acylated and aminated modified polystyrene resin as a catalyst; carrying out flash evaporation or gas stripping on the product after the reaction to remove acrolein, condensing and recovering the removed acrolein, and carrying out hydrogenation reaction on the acrolein-removed mixed solution serving as a hydrogenation raw material on a metal catalyst; and after the reaction is finished, performing flash evaporation on the product to remove water and light components, and performing vacuum rectification to obtain a high-purity 1, 3-propylene glycol product. According to the method, the modified resin is used for catalyzing the acrolein hydration reaction, the overall yield of the 1, 3-propylene glycol can be increased, the catalyst modification process is simple, the cost is low, the additional value of the final product is high, and the method is suitable for industrial production.

The invention relates to the technical field of preparation of a lithium ion battery positive electrode lithium supplement agent, in particular to preparation of a composite lithium supplement agent, which comprises the following steps: dissolving lithium hydroxide and oxalic acid in pure water to prepare a lithium oxalate saturated solution, and adding a metal catalyst; preparing lithium oxalate particles from the lithium oxalate saturated solution containing the metal catalyst through a spray dryer in an inert atmosphere; the lithium oxalate particles are put into a CVD rotary furnace, organic steam is introduced, the organic steam is decomposed through a metal catalyst to generate carbon, and the carbon is deposited on the surface of lithium oxalate; reducing the temperature of the CVD rotary furnace, introducing a silicon source, introducing water vapor, and coating the surface of the material with a SiO2 film; and reducing the temperature of the CVD rotary furnace, introducing a modifier, and carrying out a cross-linking reaction on the modifier and the surface of the material to obtain the final product Li2C2O4 (at) C (at) SiO2 (at) CF3. According to the invention, the defects of lithium oxalate insulation, high decomposition voltage and poor air stability are overcome.

The invention relates to a carbon nano reinforced thermoplastic polyurethane composite material as well as a preparation method and application thereof. The composite material is prepared from the following components in parts by mass: 5 to 20 parts of diisocyanate, 10 to 30 parts of oligomer dihydric alcohol, 1 to 10 parts of bifunctional chain extender and 1 to 20 parts of filler, the filler is prepared from the following components in parts by mass: 0.95 to 18 parts of inorganic filler and 0.05 to 2 parts of carbon-based nano filler; preparing a carbon-based nanofiller of flaky carbon nanofibers, tubular carbon nanofibers or fishbone-shaped carbon nanofibers from reaction gas by using a metal catalyst through a chemical vapor deposition method; the metal catalyst is selected from an iron-nickel catalyst or a nickel-copper catalyst, the reaction gas comprises a carbon source gas and a reducing gas, the carbon source gas is selected from carbon monoxide or ethylene, and the reducing gas adopts hydrogen. Compared with the prior art, the material has good mechanical properties and damping performance, especially has excellent normal-temperature damping performance and damping temperature range, and is suitable for 3D printing.

The present invention provides a two-component composition that suppresses dripping during spray application, has high thermal insulation properties, excellent smoothness, and high interlayer adhesion strength for spray-applied polyurethane foam roofing. [Solution] A two-component composition for spray-applied polyurethane foam for roofs, comprising: liquid A containing a polyol, a catalyst, and a blowing agent; and liquid B containing an isocyanate compound, wherein the catalyst includes a foaming catalyst and a resinification catalyst (excluding a metal catalyst), and the blowing agent includes a hydrochlorofluoroolefin and does not include the metal catalyst which is the resinification catalyst, or a trimerizing catalyst.

The present invention provides a membrane electrode assembly for preventing reverse voltage of a fuel cell, comprising an electrolyte membrane between a positive electrode and a negative electrode, in which the positive electrode and the negative electrode each comprise a supported catalyst in which a metal catalyst is supported on a support, wherein the ratio MCL / R between the metal catalyst loading amount MCL in the negative electrode and the loaded metal catalyst ratio R is 0.125 to 0.3. This membrane electrode assembly can prevent an overflow phenomenon that may occur in cold start driving or fast acceleration driving by appropriately controlling physical property factors associated with a fuel cell negative electrode. Thus, this membrane electrode assembly can suppress carbon corrosion at the negative electrode and improve durability.

The invention discloses a synthesis method of an oxazole derivative, and belongs to the technical field of chemical synthesis. The oxazole derivative is synthesized from a ketone ester compound and thiourea through a one-pot method, the required raw materials are cheap and easy to obtain, the experimental operation is simple, the reaction condition is mild, a metal catalyst and other reagents are not needed, and the defects that a metal catalysis synthesis method is used, for example, the catalyst is high in price, the reaction synthesis route steps are many, and the synthesis cost is low are overcome. The method has the advantages of mild reaction conditions, low reaction rate, unstable intermediate, low yield and the like, bypasses most complex synthesis steps of a metal-free catalytic synthesis method, and develops a simple, efficient, green and environment-friendly way for synthesizing the oxazole derivative. Under mild conditions, ketone ester substrates with different substituent groups have very strong compatibility, and a new green synthesis way is provided for synthesis of substituted oxazole.

A process for dimerizing and oligomerizing olefins to distillate fuels which utilizes a solid acid catalyst for ethylene oligomerization in a first stage and a metal catalyst for further oligomerization in a second stage. Distillate fuels can be produced from the process. Oligomerized olefins may be recycled to the first stage oligomerization reaction to ensure sufficient oligomerization of smaller olefins.

The application discloses a preparation method of a bimetallic catalyst. A polymer containing a large amount of carboxyl groups is used as a ligand polymer to perform a coordination reaction with a zinc salt and a cobalt salt, so as to prepare a high-efficiency bimetallic catalyst. When the bimetallic catalyst synthesized by the application is used to prepare polyether polyols, the catalyst can be used in an alkaline environment and an environment with metal ions within 20 ppm. The catalyst provides convenience for switching from an alkali catalytic system to a bimetallic catalytic system, greatly simplifies the washing tank condition, and greatly reduces the switching cost of a polyether production system. The application has simple process, easily-obtained raw materials and easy industrial production.

The application discloses a residual oil hydrodemetallization catalyst and a preparation method thereof. The method comprises the following steps: (1) an acid aluminum salt aqueous solution, an alkaline aluminum salt aqueous solution and a kaolin suspension liquid containing a surfactant are subjected to a first reaction to obtain slurry I; (2) an alkaline solution is introduced into the slurry I of step (1) to perform a second reaction to obtain slurry II; (3) the slurry II obtained in step (2) is subjected to hydrothermal treatment with a gallium nitrate solution, and then washed and dried to obtain a gallium-containing macroporous silica-aluminum material; (4) the gallium-containing macroporous silica-aluminum material is mixed with a plasticizing agent and a cementing agent, and then kneaded into a shape, and then dried and calcined to obtain a catalyst carrier; and (5) the catalyst carrier of step (4) is impregnated with an active metal impregnation liquid containing an organic acid and an alcohol compound, and then dried and calcined to obtain the residual oil hydrodemetallization catalyst. The catalyst can improve the demetallization activity and use stability of the catalyst in a residual oil hydroprocessing process.

The invention discloses a preparation method of an easy-to-disperse high-conductivity carbon nanotube, and relates to the technical field of preparation of carbon nanotubes. The carbon nanotube is prepared by adopting a chemical vapor deposition method, and the main generation mechanism is as follows: carbon source gas is adsorbed to a metal catalyst at a high temperature of 670-750 DEG C, the carbon source is cracked to generate carbon atoms, and when the concentration of carbon reaches a certain degree, the carbon is subjected to supersaturation precipitation, and the carbon nanotube is obtained. And regularly arranged carbon nanotubes with tubular graphite layer structures grow on the periphery of the catalyst particles. The carbon nano tube prepared by the method has excellent mechanical property and conductivity.

The invention relates to the field of organic synthesis, in particular to a synthesis method of gamma-aminophosphine oxide compounds and derivatives thereof. According to the synthesis method disclosed by the invention, alpha, beta-unsaturated amide, diaryl phosphine oxide or phosphite ester is taken as raw materials, and under the action of acid, the gamma-aminophosphine oxide compound can be rapidly and efficiently synthesized by a one-pot method. The preparation method comprises the following steps of: generating conjugated nitrile positive ions or imine salt intermediates with strong electrophilicity from alpha, beta-unsaturated amide under the activation of acid, converting diaryl phosphine oxide or phosphite ester into strong nucleophilic three-coordination phosphorus species under the action of alkali, and further performing phosphorus-doped Michael addition reaction on the conjugated intermediates to finally generate the gamma-aminophosphine oxide compounds. According to the method disclosed by the invention, diaryl phosphine oxide or phosphite which is cheap, easy to obtain and stable in structural property is used as a phosphorus source, the substrate applicability is wide, and the economic cost is relatively low; in addition, the method realizes synthesis of a target product without participation of a metal catalyst, and is rapid and efficient.

To provide an addition-curable silicone composition having good flowability even when a polyorganosiloxane containing a fluoroalkyl group is highly filled with a filler.SOLUTION: The addition-curable silicone composition contains (A) a specific linear organopolysiloxane, (B) an organosilicon compound having two or more hydrogen atoms bonded to silicon atoms in one molecule and having no alkenyl group, (C) 10 to 1,000 parts by mass of one or more fillers selected from titanium oxide, silica, and alumina based on 100 parts by mass of the component (A), (D) an organopolysiloxane represented by the following formula (1), and (E) a platinum group metal-based catalyst. The total number of hydrogen atoms bonded to silicon atoms in component (B) is 0.5 to 3.0 times.SELECTED DRAWING: None

The present invention relates to a process for the preparation of polycyclic aliphatic dialdehydes by hydroformylation of polycyclic aliphatic diolefins in the presence of synthesis gas over an organophosphorus ligand modified metal catalyst system having a transition metal of the 8th-10th subgroup, wherein the hydroformylation is carried out by means of a water-soluble diphosphine or triarylphosphine complex catalyst at a pressure of greater than or equal to 0.5 MPa and less than or equal to 10 MPa and at a temperature of greater than or equal to 70° C. and less than or equal to 150°° C. in a homogeneous liquid reaction phase, the homogeneous liquid phase comprising at least one non-aqueous solvent, diolefin and / or mono- and / or dialdehydes thereof as reaction products and an aqueous catalyst solution, the proportions of these components in the solution being controlled so as to obtain a single-phase solution under the reaction conditions.

The application relates to the technical field of material synthesis, and provides a carbon nanotube and a preparation method thereof, the preparation method comprising the following steps: preparing a spinel crystal structure of FeCoMgO as a metal catalyst, the specific surface area of the metal catalyst being 220-300 cm 3 / g; introducing the metal catalyst and a carbon source into a carbon nanotube growth device, reacting under first reaction conditions to obtain a first reaction product; reacting the first reaction product under second reaction conditions to obtain a second reaction product; and crushing the second reaction product to obtain the carbon nanotube. Through the above scheme, the dispersibility of the carbon nanotube is improved, and the problem of uneven mixing of the carbon nanotube and a high polymer composite material in a short time is solved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a synthesis method of an isoxazoline compound. The preparation method comprises the following steps: dissolving a compound 1 and ethyl acrylate in dichloroethane, then adding tert-butyl nitrite, alkali and K2S2O8, in an air environment, irradiating with a 35 W blue LED light source and stirring at room temperature for 12 hours, after the reaction is completed, reducing pressure to remove a solvent, and then performing silica gel column chromatography on a crude product to obtain a product, namely the isoxazoline compound. The synthesis method provided by the invention avoids the problem of residue of a traditional metal catalyst, and provides a new normal form for green synthesis of the isoxazoline compound. As a key intermediate, isoxazoline can derive beta-lactam, beta-amino alcohol and other structures, and a new path is provided for complex molecule synthesis.

A composition obtainable by mixing (a) a crosslinker or a crosslinker mixture obtainable by reacting (HX(CRc2)oY(CRc2)oX(CRc2)o)4-pSiKp, and (b) metal catalyst and (c) amino silane is provided.

This invention belongs to the field of semiconductor material manufacturing technology, specifically relating to a black silicon nanoforest structure, its preparation method, and its applications. The invention involves depositing a silicon-rich silicon nitride thin film via PECVD, followed by chemical etching using gaseous HF (VHF) to form a uniform silicon forest structure. This method eliminates the need for metal catalysts and masks, removing metal contamination and physical damage. The process is simple and controllable, making it suitable for the industrial production of large-area black silicon.

Method for producing a thermally conductive film (10), comprising: a first step of forming a film or block by pressing and / or rolling a mixture of a binder resin (14) and a first thermally conductive filler (15) with shape anisotropy, which has a plate shape and a main surface thereof or a needle shape and a longitudinal direction thereof, such that the first thermally conductive filler (15) is oriented in a direction of the main surface of the film or block; a second step of hardening the binder resin (14) and then cutting the film or block in one direction of thickness to obtain mold filler pieces (12) such that the first thermally conductive filler (15) in each of them is oriented in the thickness direction of the corresponding mold filler pieces (12); and a third step of mixing the mold-filler pieces (12), a matrix resin (11) and a second thermally conductive filler (13), forming the mixture into a foil mold using pressure rollers, and then hardening the matrix resin (11); wherein the thermally conductive film (10) contains the first thermally conductive filler (15) with its main surface aligned in a thickness direction of the thermally conductive film (10), if the first thermally conductive filler (15) has a plate shape; or else wherein the thermally conductive film (10) contains the first thermally conductive filler (15) with its longitudinal direction aligned in the thickness direction of the thermally conductive film (10), if the first thermally conductive filler (15) has a needle shape, and wherein the matrix resin (11) and the binder resin (14) can be cured by an addition reaction using a platinum group metal catalyst, and wherein the second thermally conductive filler (13) consists of inorganic particles, and the inorganic particles are coated with an R(CH3) a Si(OR') 3-a expressed alkoxysilane compound are surface-treated, wherein R represents a substituted or unsubstituted organic group with 1 to 20 carbon atoms, R' represents an alkyl group with 1 to 4 carbon atoms, and a is 0 or 1.

The application provides a method for preparing 2-hydroxy-1,4-naphthoquinone, which comprises the following steps: S1: dispersing 2-naphthol, a phase transfer catalyst and a base in water to obtain a 2-naphthol alkali solution; S2: adding a hypochlorite aqueous solution to the 2-naphthol alkali solution at 5-30 DEG C, and then increasing the temperature to 50-60 DEG C to react, so that 2-naphthol is oxidized to an intermediate isomerization and rearrangement to generate 2-hydroxy-1,4-naphthoquinone salt, and a 2-hydroxy-1,4-naphthoquinone salt solution is obtained; S3: adjusting the pH of the 2-hydroxy-1,4-naphthoquinone salt solution, so that the 2-hydroxy-1,4-naphthoquinone salt is converted into 2-hydroxy-1,4-naphthoquinone and precipitated, and a 2-hydroxy-1,4-naphthoquinone crude product is obtained. The method uses 2-naphthol as a raw material, and high-purity and high-yield 2-hydroxy-1,4-naphthoquinone is obtained, while the safety hazards and environmental burdens caused by the use of a large amount of peroxide oxidants and metal catalysts are avoided, the process flow is simplified, and the method is more suitable for industrialization.

This invention provides an electrochemical removal device for inorganic nitrogen in pond aquaculture effluent and its application. The device has an anode and a cathode at its two ends, with multiple sets of anion exchange membranes and cation exchange membranes alternately arranged from the anode to the cathode, forming a concentration chamber and a denitrification chamber in sequence, starting and ending with the concentration chamber. The concentration chamber containing the anode and cathode is referred to as the anode chamber and cathode chamber, respectively. In the denitrification chamber, nitrate, nitrite, and ammonium ions in the pond aquaculture effluent migrate to the concentration chamber, cathode chamber, and anode chamber under electrodialysis, resulting in a rapid decrease in ion concentration in the effluent, which is then directly discharged. The cathode is loaded with a copper-based metal catalyst, which can electrocatalytically reduce nitrate and nitrite nitrogen to nitrogen gas. The anode is loaded with a copper-based oxide or hydroxide catalyst, which can electrocatalytically oxidize ammonia nitrogen to nitrogen gas without the need for active chlorine, thus solving the adverse effect of the lack of chloride ions in pond effluent on ammonia nitrogen conversion.

The invention belongs to the field of adhesives, and relates to an acrylate structural adhesive as well as a preparation method and application thereof. The acrylate structural adhesive contains a component A and a component B, the component A is prepared from an acrylate monomer, polyurethane acrylic resin, methacrylic acid phosphate, a toughening agent, a metal catalyst and a first thixotropic agent according to the mass ratio of 100 to (20 to 100) to (0.2 to 20) to (20 to 100) to (0.2 to 20) to (2 to 20); the component B contains epoxy resin and a non-benzene initiator in a mass ratio of 100: (50-200): (50-200): (2.5-25), as well as an optional plasticizer and a second thixotropic agent; the general formula of the toughening agent is CH2 = C (CH3) C (O) OCH2-CH (OH)-CH2-S-R-S-CH2-CH (OH)-CH2-OC (O) C (CH3) = CH2. The general formula of the toughening agent is as follows: CH2 = C (CH3) C (O) OCH2; the acrylate structural adhesive provided by the invention is transparent in appearance and has good normal-temperature and low-temperature toughness.

The invention discloses a high-efficiency purification method of a single-walled carbon nanotube, which belongs to the technical field of nano material preparation and treatment, and comprises the following steps: pre-oxidizing an original single-walled carbon nanotube in an acidic potassium permanganate solution, and carrying out microwave liquid-phase selective heating treatment to promote a carbon shell wrapping a metal catalyst to break, so as to obtain the high-efficiency purification method of the single-walled carbon nanotube. Then, the exposed metal core is effectively dissolved through mixed acid pickling, and finally, the high-purity single-walled carbon nanotube is obtained through washing and drying. According to the method, through the synergistic effect of pre-oxidation and microwave heating, carbon-coated iron and other stubborn impurities are efficiently and deeply removed, meanwhile, the structural integrity of the carbon tubes is protected to the maximum extent, the problems that impurities are difficult to remove and the carbon tubes are prone to being damaged in a traditional acid pickling method are solved, and the method is suitable for industrial production. And the defects of harsh conditions and poor controllability of a high-temperature oxidation method are overcome, so that the final product has high purity, low structural defects and good dispersity, and the application requirements of the fields of high-end electronics, composite materials, energy storage and the like on high-performance carbon nanotube materials are met.

The present application relates to a process for the preparation of pyroxasulfone comprising reacting 3-[(5-difluoromethoxy-1-methyl-3-trifluoromethylpyrazol-4-yl) methylthio]-4, 5-dihydro-5, 5-dimethylisoxazole with hydrogen peroxide in the presence of a metal catalyst wherein the solvent comprises at least one carbonate and water.

The present application provides a kind of isocyanate prepolymer composition and its preparation method which can be stably stored.The composition contains isocyanate prepolymer, phosphine compound.The phosphine compound does not react with isocyanate in the system, and can capture basic or metal catalyst in the prepolymer compound system to deactivate it, reduce the further reaction of isocyanate and carbamate / uretonimine crosslinking, and further reduce the generation of macromolecular polymer, reduce the viscosity and composition change of product, and thus improve the storage stability of product.

The invention discloses a high-temperature-resistant high-activity metallocene catalyst and application thereof, and belongs to the technical field of olefin polymerization catalysts. The catalyst provided by the invention is formed by taking a fused ring structure with a rigid framework as a ligand framework and coordinating with transition metal titanium, zirconium or hafnium, so that the catalyst has excellent thermal stability and high catalytic activity, and is suitable for copolymerization reaction of ethylene and alpha-olefin. In the high-temperature polymerization reaction, the catalyst provided by the invention realizes efficient copolymerization of ethylene and alpha-olefin, and the obtained copolymer not only has higher molecular weight, but also has higher comonomer insertion amount, so that the structure and performance of the product are effectively regulated and controlled.

The application relates to a method for synthesizing ferrocene phosphine oxide compounds. Specifically, a ferrocene-substituted compound, diaryl phosphine oxide is used as raw material to realize C-H phosphine oxide reaction of ferrocene under the promotion of electricity. The application has the following advantages: the ferrocene-substituted compound is directly used as a C-H donor without guidance, no additional oxidant and metal catalyst are needed, the condition is mild, the substrate range is wide, and the yield is good.

The invention provides a fiber multilayer composite air filtering material and a preparation method thereof. The fiber multilayer composite air filtering material comprises a fiber base material, a metal catalyst is loaded on the fiber base material, the surface of the fiber base material is covered with a nanofiber membrane, the fiber base material is composed of alkali-treated bamboo fibers and polymer fibers, and the nanofiber membrane contains an antibacterial agent and a silane coupling agent. The fiber multilayer composite air filtering material has the advantages of high catalyst loading capacity, excellent filtering efficiency, good mechanical strength and toughness and the like, the raw materials are wide in source, the process is simple and environment-friendly, and a new way is provided for development of multifunctional air filtering materials. The invention also provides a preparation method of the fiber multilayer composite air filtering material.

The application discloses an Ag-MoO x A preparation method of a bimetallic catalyst, an Ag-MoO x A bimetallic catalyst and application, the preparation method comprises the following steps: after a mixture containing a molecular sieve, an alkali source, a silver source and a molybdenum source is impregnated, dried and calcined, the Ag-MoO x A bimetallic catalyst; wherein the impregnation comprises the following steps: the molecular sieve and the alkali source are first impregnated and treated, and then impregnated with a solution containing the silver source and the molybdenum source, or the molecular sieve, the silver source and the molybdenum source are first impregnated and treated, and then impregnated with the alkali source. The application is greatly improved in the production efficiency of 2-methylpropenol by being matched with a continuous reactor-fixed bed. Under the condition that hydrogen is used as a reducing agent and without a solvent, the conversion rate of methylpropenal on the bimetallic catalyst reaches 82%, the selectivity of 2-methylpropenol is 89%, and meanwhile, the catalyst can be stably operated for a longer time.

Disclosed in the present invention are a multidentate ligand, a multidentate ligand metal catalyst, a preparation method therefor and the use thereof. The multidentate ligand of the present invention has a general structural formula shown as formula (1) or formula (2), and the multidentate ligand metal catalyst has a general structural formula shown as formula (3) or formula (4). The preparation method of the multidentate ligand of the present invention is simple and efficient. The multidentate ligand metal catalyst has high catalytic activity, can still maintain catalytic activity under low loads (amounts), and involves a wide range of applicable substrates.