23 results about "Cobalt(II) acetate" patented technology

The invention relates to a nickel-free hole sealing agent and a preparation method thereof, and belongs to the technical field of high polymer materials. The nickel-free hole sealing agent comprises the following components in parts by weight: 3-10 parts of cobalt acetate, 1-11 parts of a corrosion-resistant modifier, 1-6 parts of ethylenediamine tetraacetic acid, 3-7 parts of sodium silicate and 5-15 parts of deionized water, an intermediate product containing bis-imidazoline in the corrosion-resistant modifier is tightly adsorbed on the metal surface by virtue of electrostatic attraction and a large pi bond to form a tough protective film, so that a water-phase corrosive medium is effectively isolated, the corrosion speed is remarkably reduced, and meanwhile, the corrosion-resistant modifier has good heat-resistant stability and still has a corrosion inhibition effect in a high-temperature environment; the glycine enables the nickel-free hole sealing agent to better fill tiny holes in the metal surface, so that the surface is flat and smooth, and uniform distribution and permeation of the hole sealing agent are promoted; quaternary ammonium salt destroys cell walls and cell membranes of microorganisms and inhibits growth and reproduction of the microorganisms; the nickel-free hole sealing agent prepared by the invention not only has a good antistatic effect, but also has excellent high-temperature-resistant and antibacterial effects.

The invention discloses a nickel-cobalt bimetallic nanoparticle material for synthesizing tetrahydrofurfuryl alcohol through full hydrogenation as well as a preparation method and application of the nickel-cobalt bimetallic nanoparticle material. The method comprises the following steps: dissolving nickel acetate tetrahydrate and cobalt acetate tetrahydrate in absolute ethyl alcohol, carrying out ultrasonic treatment, adding an ethanol solution in which polyvinylpyrrolidone is dissolved, carrying out ultrasonic treatment, putting into a preheated oil bath pan, standing, refluxing, centrifuging, and taking precipitate, so as to obtain NiCo-precursor; the preparation method comprises the following steps: adding NiCo-precursor and dopamine hydrochloride into an ethanol solution of tris (hydroxymethyl) aminomethane, putting into an oil bath pan, uniformly stirring, centrifuging, washing and drying to obtain NiCo (at) PDA; and calcining in an inert atmosphere to obtain the catalyst. The nickel-cobalt bimetallic nanoparticle material is simple in preparation process, mild in reaction condition, high in catalyst activity, easy to separate and good in cycling stability, and is expected to show good application potential in industrial application.

A process for the preparation of a 2,5-tetrahydrofurandimethanol difatty acid ester, comprising the following steps: providing a reaction system containing 2,5-tetrahydrofurandimethanol with a monobasic acid, wherein the structural formula of the monobasic acid is R-COOH, where R is an alkyl group from C5 to C20; esterification in the presence of a catalyst to obtain the 2,5-tetrahydrofurandimethanol difatty acid ester, wherein the catalyst is at least one of calcium acetate, tetraalkoxytitanium, manganese acetate, cobalt acetate, aluminum oxide, zinc oxide, and zinc-aluminum spinel; wherein the 2,5-tetrahydrofurandimethanol difatty acid ester has a structural formula as shown in Formula I, characterized in that the calcium acetate, tetraalkoxytitanium, manganese acetate, cobalt acetate, aluminum oxide, zinc oxide, and zinc-aluminum spinel have a particle size of have less than or equal to 80 mesh, and the reaction system includes a solvent,wherein the solvent is at least one of dimethyl sulfoxide and dimethylformamide.

The invention relates to a preparation method and application of a Co3O4-loaded nitrogen-carbon nanomaterial, and the preparation method comprises the following steps: (1) adding cobalt acetate and polyacrylonitrile into an N, N-dimethylformamide solution to prepare a spinning solution, and carrying out electrostatic spinning to obtain nanofibers containing cobalt ions; (2) soaking the nanofiber containing the cobalt ions in an ethanol solution containing 2-methylimidazole, and reacting to obtain a nanofiber containing ZIF-67; (3) carbonizing the ZIF-67-containing nanofibers in an inert atmosphere to obtain a nitrogen-carbon nanomaterial containing a cobalt elementary substance; and (4) oxidizing the nitrogen-carbon nano material containing the cobalt elementary substance in an air atmosphere to obtain the Co3O4-loaded nitrogen-carbon nano material. The nitrogen-carbon nanomaterial obtained by the invention can realize high-sensitivity detection of HQ and CC, and has feasibility and accuracy in practical application.

The invention discloses a novel binuclear chiral catalyst for preparing S-epichlorohydrin with high optical purity as well as a synthesis method and an application method of the novel binuclear chiral catalyst. The molecular formula of the catalyst is [Co2L (Y) 2]. NH2O, L is a Salen tetradentate ligand formed by condensation of (R, R)-1, 2-cyclohexanediamine, 3-tert-butyl-2, 5-dihydroxybenzaldehyde and 4-oxa-1, 7-pimelic acid, and Y is a sulfonate radical or an acetate radical. The preparation method comprises the following steps: carrying out acidic hydrolysis on 2-cyanoethyl ether to obtain 4-oxa-1, 7-pimelic acid; 2-tert-butylhydroquinone is subjected to protection, formylation and deprotection, and benzaldehyde is prepared; carrying out condensation on the Salen ligand and (R, R)-1, 2-cyclohexanediamine to generate dialdehyde, and cyclizing the dialdehyde with (R, R)-1, 2-cyclohexanediamine to obtain a Salen ligand; and finally, complexing with cobalt acetate and acid under nitrogen to separate out a catalyst crystal. When the catalyst is used for epoxy chloropropane water-phase resolution and gas-phase detection, the reaction is terminated when ee is greater than or equal to 99.5%, the catalyst is directly filtered and recovered, the S-epoxy chloropropane is obtained through reduced pressure distillation, the ee is still greater than or equal to 99.0% after the catalyst is circulated for five times, and the recovery rate is greater than or equal to 92%.

The application discloses a 2,6-naphthalene dicarboxylic acid and a preparation method thereof, which is catalyzed by cobalt bromide-manganese bromide-cobalt acetate-manganese acetate, and belongs to the fine chemical field. 2,6-naphthalene dicarboxylic acid is obtained through a carboxylation reaction of 2,6-dimethylnaphthalene with air under the action of a catalyst containing bromine, cobalt and manganese, and through cooling crystallization, centrifugal filtration and drying. The application provides a catalyst containing bromine, cobalt and manganese and free of alkali metal cations, which can solve the corrosion problem of the catalyst on stainless steel equipment in the prior art under the premise of ensuring production efficiency, greatly reduces the energy consumption in production, and is beneficial to the industrialized production of 2,6-naphthalene dicarboxylic acid monomer.

The invention discloses a preparation method of a methane combustion catalyst with water resistance. According to the method, cobaltous acetate and ethylene glycol are taken as raw materials and mixed to form a uniform turbid solution, and the turbid solution is heated under the protection of argon; then, dropwise adding a sodium carbonate solution into the cobalt acetate solution in a protective atmosphere, standing, aging, cooling to room temperature, centrifugally separating, washing with deionized water, dispersing with ethanol, and filtering to obtain a primary solid; and drying the obtained solid in a vacuum environment, and calcining to prepare the cobalt oxide nano material. The method comprises the following steps: dissolving and dispersing palladium nitrate in water, dropwise adding the solution into cobalt oxide under the protection of argon, mixing to form viscous slurry, drying, and calcining in a muffle furnace to finally obtain the Pd / Co3O4 catalyst. The prepared Pd / Co3O4 catalyst has high oxygen vacancy density, excellent methane combustion catalytic activity and water resistance, the activity loss is less than 3% when the Pd / Co3O4 catalyst continuously operates for 100 hours under the condition of containing 3% of water vapor, and the Pd / Co3O4 catalyst is especially suitable for methane combustion reaction and shows excellent catalytic efficiency and long-term stability.

The invention relates to a vanadium cluster bridged cobalt complex as well as a preparation method and application thereof. The molecular formula of the complex is (H2V10O28) [Co (H2O) 4Co (C20H14N4) 2] 2. (H2V10O28) (C20H14N4 = 4 '-(4-pyridyl)-2, 2': 6 ', 2' '-terpyridyl). Dissolving vanadium pentoxide and sodium orthovanadate in distilled water, adding a sodium hydroxide solution, stirring until the solution is clear, adjusting the pH value of the solution to 3.5-4.9 by using hydrochloric acid, and placing the solution at the bottom of a test tube as a lower layer; adding a mixed solution of distilled water and acetonitrile as a transition layer; the upper layer is a mixed solution of distilled water dissolved with cobalt acetate and 4 '-(4-pyridyl)-2, 2': 6 ', 2'-terpyridyl and acetonitrile; slowly diffusing to obtain a yellow blocky crystal finished product; the complex is novel in structure and simple in preparation method.

The present disclosure discloses a noble metal oxide cluster catalyst anchored on cobalt-based nanosheets and a preparation method thereof. The preparation method includes mixing a cobalt acetate solution, a metal salt solution, ammonium metavanadate, and acetylene black uniformly, stirring at a temperature in a range of 50 °C to 100 °C, and filtering to collect a sample; and subjecting the sample to vacuum drying, pyrolyzing the sample under air atmosphere, to obtain the noble metal oxide cluster catalyst anchored on cobalt-based nanosheets.

The present invention relates to the technical field of electrocatalytic water decomposition to produce hydrogen, and in particular to an S-(FeNiM)LDH / IF electrocatalyst, a preparation method, and applications thereof. M is Co or In, and the electrocatalyst is a three-dimensional layered nanosheet structure sheet. Cobalt acetate (or indium chloride), nickel acetate, and foamed iron are used as raw materials. The cobalt acetate and nickel acetate are first dissolved in H2O and ethanol at a temperature of 25°C. After reacting for 30 minutes, a Na2S solution is slowly added and the reaction is continued for 30 minutes. A NaOH solution is slowly added dropwise and reacted for 30 minutes. The reaction is then heated to 80°C and reacted for 2.5 hours to obtain a composite material S-(FeNiM)LDH / IF (M=Co, In) having a layered nanosheet structure. The S-(FeNiCo)LDH / IF composite material prepared by the present invention was used as the anode, and the S-(FeNiIn)LDH / IF composite material prepared by the present invention was used as the cathode to form an electrolytic cell (S-(FeNiCo)LDH / IF||S-(FeNiIn)LDH / IF), which was used for electrolysis of water and achieved good catalytic effect.

The invention discloses a cyano-bridged high-entropy material as well as a preparation method and application thereof. The preparation method of the cyano-bridged high-entropy material comprises the following steps: step 1, dissolving manganese acetate, cobalt acetate, cupric acetate and zinc acetate in ultrapure water, and adding PVP and sodium citrate to prepare a solution A; step 2, dissolving potassium nickelocyanate in ultrapure water to prepare a solution B, pouring the solution B into the container filled with the solution A after the solution B and the solution A are dissolved, introducing argon after the solution B and the solution A are mixed, discharging air in the container, and sealing to obtain a mixed solution A and B; and 3, transferring the container filled with the AB mixed solution into a hydrothermal reaction kettle, carrying out heating reaction at 50-80 DEG C for 14-18 hours, and then washing and drying to obtain the cyano-bridged high-entropy material. The invention provides the application of the cyano-bridged high-entropy material as a photocatalyst in hydrogen production by visible light photocatalytic decomposition of water, and the performance of hydrogen production by photocatalytic decomposition of water is effectively improved.

The invention discloses a Co-MOF (Metal Organic Framework) material based on 1-aminobenzene-3, 4, 5-tricarboxylic acid as well as a preparation method and application of the Co-MOF material. The invention discloses a preparation method of cobalt acetate. The preparation method comprises the following steps: sealing a mixture of 4, 4 '-azobipyridine, acetonitrile and water in a 10mL small glass bottle, carrying out a hydrothermal reaction, adding a mixture of 1-aminobenzene-3, 4, 5-tricarboxylic acid and water, stirring, adjusting the pH value to 9, continuing to carry out a sealed reaction for 24 hours, cooling to room temperature, washing, and drying to obtain the high-crystallinity Co-MOF material. The preparation method is simple and feasible. The Co-MOF material has good friction power generation performance and stability, and when the Co-MOF material is applied to a vertical contact separation type friction nanometer generator and water pollution treatment, the device can efficiently degrade 98.8% of methylene blue within 90 minutes under the working condition of 5Hz.

This invention discloses a method for preparing and applying a hollow tubular carbon nitride-anchored boron-nitrogen co-cobalt single-atom catalyst. The preparation method involves mixing melamine, boric acid, cobalt acetate, and water, stirring to obtain a mixed solution. This solution is then subjected to a hydrothermal reaction at 160℃–180℃ for 12–24 hours. Solid-liquid separation is performed, the solid is washed and dried, and calcined under a nitrogen atmosphere at 450℃–650℃ to obtain the hollow tubular carbon nitride-anchored boron-nitrogen co-cobalt single-atom catalyst. The hollow tubular carbon nitride-anchored boron-nitrogen co-cobalt single-atom catalyst prepared by this invention has advantages such as high specific surface area, numerous reactive sites, good catalytic performance, high metal atom utilization rate, and structural stability. It can be widely used to activate persulfate to degrade organic pollutants, exhibiting good degradation effects and demonstrating significant application value and prospects. Furthermore, the preparation method of this invention is simple, convenient to operate, uses readily available raw materials, is low in cost, and is easily industrialized, showing great application potential in the field of environmental catalysis.

The application provides a preparation method of a cobalt Prussian blue / carbon nitride ball composite photocatalyst, which comprises the following steps: (1) dissolving melamine and cyanuric acid in dimethyl sulfoxide solutions respectively, mixing the two solutions, stirring, and then centrifuging to obtain white solids; and after centrifugal separation, calcination and drying, carbon nitride nanoballs are obtained; (2) dispersing the carbon nitride nanoballs obtained in step (1) in a mixed solution of water and methanol, and ultrasonically dispersing to obtain a mixed solution A; (3) adding potassium hexacyanocobaltate into the dispersed mixed solution of step (2) and stirring to obtain a mixed solution B; (4) dissolving cobalt acetate in a mixed solution of water and methanol, and adding into the mixed solution of step (3) drop by drop, and continuing to stir for 1 h to obtain a mixed solution C; and (5) standing the mixed solution C of step (4) for 12 h, centrifugally separating, washing with ultrapure water, and drying in a vacuum oven to obtain the cobalt Prussian blue / carbon nitride ball composite photocatalyst.

The present invention discloses a cobalt-based nanosheet-anchored precious metal oxide cluster catalyst, a preparation method, and an application thereof, relating to the field of catalyst technology. The preparation method comprises: thoroughly mixing a cobalt acetate solution, a metal salt solution, ammonium metavanadate, and acetylene black, stirring at a temperature of 50°C to 100°C, and filtering and collecting a sample; vacuum drying the sample, and then pyrolyzing it in an air atmosphere to obtain a catalyst; the present invention also provides an application of the catalyst in the field of energy catalysis. The beneficial effects of the present invention are that the catalyst has a well-defined structure, high electrical / ionic conductivity, catalytic activity, and stability. At the same time, the preparation method of the catalyst is simple, the cost is low, and it can be synthesized in large quantities. It has high potential industrial application value in the field of energy catalysis and can be used for electrocatalytic water decomposition, oxygen reduction reaction, carbon dioxide reduction reaction, and various organic catalytic reactions.

This invention belongs to the field of hydrogen storage material technology, specifically relating to a method for preparing a CoTi-MOF-derived bimetallic oxide catalyst, comprising the following steps: (1) mixing and stirring cobalt acetate, titanium tetrafluoride, trisodium citrate dihydrate, and water, and allowing it to stand to obtain a mixed solution; (2) mixing and stirring potassium cobalt cyanide and water, and allowing it to stand to obtain a potassium cobalt cyanide solution; (3) mixing and stirring 2-methylimidazole and water, and allowing it to stand to obtain a 2-methylimidazole solution; (4) stirring the mixed solution, the potassium cobalt cyanide solution, and the 2-methylimidazole solution, and allowing them to stand. After standing, the resulting product is centrifuged, washed, and dried to obtain a CoTi-PBA precursor; (5) calcining the obtained CoTi-PBA precursor to obtain a CoTi-MOF-derived bimetallic oxide catalyst. This invention also relates to oxide catalysts and their application in the preparation of lithium aluminum hydride hydrogen storage materials. The catalyst prepared by the method of this invention can significantly reduce the dehydrogenation temperature of lithium aluminum hydride materials and improve their hydrogen release efficiency.

The application discloses a preparation method and application of a Co and Cu co-doped CN-based composite material, and relates to the following steps: after urea is calcined in a muffle furnace, the urea is treated in a constant-temperature oil bath together with a mixed solution containing 1,10-phenanthroline, copper acetate and cobalt acetate; after the solvent is evaporated by heating, pyrolysis is further carried out under N2 atmosphere, so that the Co and Cu co-doped CN-based composite material is obtained. The composite material can be used for activating peroxymonosulfate (PMS) to degrade BPA in wastewater, and the removal effect is excellent, and the removal rate of BPA can reach 97.07% within 15 min.

The application discloses a kind of potassium doped modified cobalt nickel bimetallic organic framework CoNi-MOF-K, by cobalt acetate, nickel acetate, 1,2,3,4-butane tetracarboxylic acid synthesis CoNi-MOF, then, product is carried out hydrothermal reaction with potassium chloride, finally, the electrode material of potassium ion doped modified cobalt nickel bimetallic metal organic framework is obtained, simply called CoNi-MOF-K;The micro-morphology of CoNi-MOF-K is three-dimensional microsphere structure, and the surface of microsphere is composed of nanosheet, and dense pore structure is formed;The specific surface area of the electrode material is 24.3-27.4cm 2 g ‑1 . Its preparation method includes the following steps: 1, the preparation of CoNi-based precursor solution;2, the preparation of CoNi-MOF-K.As the application of supercapacitor, charge and discharge in the range of 0-0.55V, when the current density is 1A g ‑1 , the specific capacity reaches 900-1400F g ‑1 ;When 8A g ‑1 , the capacitance retention rate is 72%.

This invention discloses a Co-CFA-1-based butadiene polymerization catalyst and its preparation method. The butadiene polymerization catalyst comprises Co-CFA-1, a co-catalyst, and toluene solvent. The Co-CFA-1 is prepared by heating a dispersion of CFA-1 and cobalt acetate tetrahydrate in NMF at 55–65°C for 18–30 hours, followed by filtration, washing, and vacuum drying to obtain Co-CFA-1. The co-catalyst is composed of alkylaluminum and methylaluminoxane, wherein the alkylaluminum is selected from at least one of diethylaluminum chloride, triisobutylaluminum, and diethylaluminum chloride. This invention provides the application of the Co-CFA-1-based butadiene polymerization catalyst in the preparation of cis-polybutadiene, which can produce high-quality polybutadiene rubber products with high cis-structure content, controllable molecular weight, and narrow molecular weight distribution, and the product yield is high.

The invention discloses a preparation method of an electrocatalyst NiPPc added with Co element, and relates to the technical field of electrochemistry. The preparation method comprises the following steps: preparing NiPPc by adopting a solvothermal method: dispersing 40 milligrams of nickel acetate tetrahydrate and 90 milligrams of 1, 2, 4, 5-tetracyanobenzene in 35 milliliters of ethanol solution, stirring for 10 minutes, performing ultrasonic treatment for 30 minutes after stirring is completed, putting the mixture into a reaction kettle for reaction at 100 DEG C after the mixture is uniformly dispersed, washing the mixture with the ethanol solution after the mixture is completely reacted and naturally cooled, and performing forced air drying to obtain a sample NiPPc; cobalt acetate tetrahydrate with different mass fractions is added on the basis of the nickel element content, and Co-coated NiPPc is prepared. By controlling the doping amount of the metal ion Co, the activity and selectivity of the synthesis gas prepared by reducing the CO2 under the electrocatalysis of the NiPPc can be improved, so that the content of the carbon dioxide in the atmosphere is effectively reduced.

The invention relates to a magnetic carbon aerogel composite material and a preparation method and application thereof.The magnetic carbon aerogel composite material is prepared through the following method that S1, NaOH, cobalt acetate tetrahydrate and nickel acetate tetrahydrate are completely dissolved in ethylene glycol and transferred into a reaction kettle, a hydrothermal reaction is conducted in a magnetic field environment, and a one-dimensional CoNi alloy chain is obtained; and S2, adding the obtained one-dimensional CoNi alloy chain, pectin and polyvinyl alcohol into deionized water, uniformly stirring, and then freeze-drying and calcining to obtain a product, namely the magnetic carbon aerogel composite material. Compared with the prior art, the invention has the advantages of simple preparation process, high success rate, low cost, strong wave-absorbing property, wide absorption frequency band and the like.

The invention belongs to the technical field of semiconductor metal oxide functional materials and gas-sensitive sensing, and particularly relates to a Fe-doped Co3O4 microsphere gas-sensitive material as well as a preparation method and application thereof. Cobalt acetate and anhydrous ferric trichloride are used as raw materials, CTAB is used as a template agent, ethylene glycol is used as a solvent, a one-step solvothermal method is adopted to prepare a ferrocobalt precursor, and the ferrocobalt precursor is subjected to heat treatment in an air atmosphere to obtain the Fe-doped Co3O4 microsphere structure gas sensitive material. Compared with a pure Co3O4 microsphere gas-sensitive material and a Fe-doped Co3O4 microsphere gas-sensitive material, the Fe-doped Co3O4 microsphere gas-sensitive material has a very high response value (101) to 100 ppm acetone at 210 DEG C, also has very good gas selectivity and repeatability test performance, can be used for high-sensitivity detection of acetone, and has important practical significance in early disease warning and real-time monitoring of acetone in industrial production. The method is simple in preparation process, low in cost and good in controllable effect.

The application provides a cobalt-iron sodium cyanide positive electrode material and application thereof. The positive electrode material is prepared by the following steps: 1, carboxylating carbon nanotubes; 2, in an ethanol solvent, carrying out a solvothermal reaction on cobalt acetate tetrahydrate, urea and the carboxylated carbon nanotubes according to a mass ratio of 1:(0.5-5):(0.005-0.05) to obtain a cobalt source precursor; 3, carrying out a coprecipitation reaction on a sodium source, the cobalt source precursor, sodium ferrocyanide and a surfactant according to a mass ratio of (1-10):1:(0.5-5):(0.5-4), and aging the reaction solution to obtain the cobalt-iron sodium cyanide positive electrode material. The cobalt-iron sodium cyanide positive electrode material of the application has excellent conductivity, excellent rate performance and cycle stability when applied to a water-based sodium ion battery.