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

A method for preparing positive electrode multielement active material containing lithium / manganese composite oxide includes directly using lithium hydroxide coprecipitation to prepare M ( OH )2 , mixing it with lithium salt in grinding , forming plate by pressing , prebaking , cooled ball grinding , forming plate by pressing and backing . In the method , applied nickel salt is nickel acetate or nickel nitrate , applied cobalt salt is cobalt acetate or cobalt nitrate, applied manganese salt is manganese nitrate or manganese acetate and applied lithium salt is lithium carbonate or lithium acetate .

The invention provides a preparation method of cobalt-manganese composite oxide nanoparticles and the application of the cobalt-manganese composite oxide nanoparticles prepared by adopting the method in a lithium ion battery. The corresponding method comprises the steps that a predetermined amount of manganese acetate and polyvinylpyrrolidone are dissolved in water and an ethanol solution, and a manganese acetate and polyvinylpyrrolidone solution is obtained; under a predetermined temperature condition, a cobalt potassium cyanate solution is dropwise added into the manganese acetate and polyvinylpyrrolidone solution, is magnetically stirred and then stands still for predetermined time, and cobalt cyanic acid radical complex nanoparticles are obtained through centrifugal separation; and the dried cobalt cyanic acid radical complex nanoparticles are calcined in air for predetermined time at a calcination temperature of 400 DEG C, and the cobalt-manganese composite oxide nanoparticles are obtained after the calcination. According to the preparation method, higher temperature and longer reaction time are not needed, the shapes and the structures of the particles are easy to control, the manufacturing process is relatively simple, the requirement for equipment is not high, and large-scale popularization and application can be realized.

The invention relates to a g-C3N4 supported cobalt oxide catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing an aqueous solution of cobalt acetate and an aqueous solution of g-C3N4, mixing, and magnetically stirring to obtain a mixed solution A; adding ammonia water to the mixed solution A in a dropwise manner, and magnetically stirring to obtain a mixed solution B; adding the mixed solution B to an autoclave provided with a polytetrafluoroethylene liner, and carrying out a hydrothermal reaction at 130-160DEG C for 8-12h to obtain a mixture; and centrifuging the mixture, removing the obtained supernatant, washing the obtained residual solid substance, transferring the solid substance to an oven, and drying at 60DEG C for 8h to prepare the g-C3N4 supported cobalt oxide catalyst. The prepared catalyst can be used in catalysis of carbon monoxide low temperature oxidation, and can maintain complete conversion of carbon monoxide into carbon dioxide at 122DEG C for at least 2400min.

The invention relates to a graphene loaded cobaltous oxide catalyst and a preparation method thereof. The preparation method comprises the steps that a cobaltous acetate aqueous solution and a graphene oxide aqueous solution are prepared firstly, after mixing is conducted, magnetic stirring is conducted, and a mixed solution A is obtained; ammonia water is dropwise added into the mixed solution A, magnetic stirring is conducted, and a mixed solution B is obtained; the mixed solution B is filled into a high-pressure reaction kettle with a polytetrafluoroethylene lining, a hydrothermal reaction is conducted for 10-14 h at 160-190 DEG C, and a mixture is obtained; after speed centrifugal separation is conducted on the obtained mixture, supernatant liquor is removed, residual solid matter is transferred to a drying oven after being washed, drying is conducted for 8 h at 60 DEG C, and the graphene loaded cobaltous oxide catalyst is prepared. The prepared catalyst can be applied to catalyzing of carbon monoxide low-temperature oxidation, the carbon monoxide can be completely oxidized into carbon dioxide at 100 DEG C, and the carbon monoxide can be completely converted into the carbon dioxide for at least 3000 min at 100 DEG C.

The invention discloses a monatomic cobalt-loaded tubular carbon nitride catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: mixing melamine and/or dicyandiamide with water to prepare a mixed solution; carrying out hydrothermal reaction on the mixed solution to obtain a supramolecular precursor; and mixing the supramolecular precursor with an ethanol solution of cobalt acetate to prepare a cobalt acetate-loaded supramolecular precursor, and calcining to obtain the monatomic cobalt-loaded tubular carbon nitride catalyst. The atomic cobalt-loaded tubular carbon nitride catalyst prepared by the method has the advantages of high specific surface area, multiple reaction active sites, good catalytic performance, high metal atom utilization rate and the like, can be widely used for activating persulfate to degrade organic pollutants, has a good degradation effect, and has good application value and application prospect; meanwhile, the preparation method disclosed by the invention also has the advantages of simple process, convenience in operation, easiness in obtaining raw materials, low cost and easiness in realizing industrial production, and has a relatively great application prospect in the field of environmental catalysis.

The invention discloses an oxidation reduction method of cobalt-manganese composite oxide applied to low-concentration propane combustion reaction, a product of the oxidation reduction method and application of the product. The method comprises the steps of continuing adding a 0.6mol/L formic acid solution into a potassium permanganate solution and a cobalt acetate solution at 50-80 DEG C under mixing and stirring conditions, continuing to stir for a period of time, and carrying out suction filtration, washing, drying and roasting, so as to obtain cobalt-manganese oxide. The obtained oxide isapplied to propane catalytic combustion reaction, the initiation temperature is 110 DEG C, and the oxide presents very good activity. According to the oxidation reduction method, by adding reducing agents with different strengths into a strong oxidant, namely the potassium permanganate solution in batches, potassium permanganate is gradually reduced, and the oxide is gradually formed, so that forming of different crustal surfaces is conveniently adjusted and controlled, the required oxide surface is exposed, and the catalysis to different reactions is realized. The method has the advantages ofnovel thought, controllability, adjustability and simple preparation process and is applicable to the preparation process of manganese-base composite oxide.

The invention discloses a preparation method of a nitrogen-doped water electrolysis oxygen production heterogeneous catalyst. The method comprises the following steps: dissolving cobalt acetate, thiourea and ammonium fluoride into a mixed solvent consisting of deionized water and ethylene glycol to obtain a precursor solution, transferring the precursor solution into a hydrothermal kettle, addingfoamed nickel, carrying out a solvothermal one-pot reaction, carrying out heating twice, carrying out in-situ co-growth on the foamed nickel to obtain a Co4S3/Ni3S2 nanosheet composite material with aheterostructure, and carrying out high-temperature nitridation treatment on the foamed nickel-based composite material after the solvothermal reaction is finished to finally obtain the foamed nickel-based nitrogen-doped water electrolysis oxygen production heterogeneous catalyst. The nanosheet composite material growing on foamed nickel in situ is used as a water electrolysis oxygen production catalyst, has a lower cost than a noble metal and metal oxide water electrolysis oxygen production catalyst, and has better intrinsic catalytic activity than a single-component transition metal sulfidenanosheet catalyst.

The objects of the present invention are to provide core-shell type cobalt oxide microparticles, a dispersion containing such microparticles, and a production process and uses of the microparticles and the dispersion, and the invention is directed at: core-shell type cobalt oxide microparticles having an average particle diameter of from 50 to 200 nm, wherein the core is a secondary particle of spherical shape to a surface of which an organic polymer is attached as the shell; a dispersion of such cobalt oxide microparticles; a dry powder obtained from such a cobalt oxide microparticle dispersion; a process for producing core-shell type cobalt oxide microparticles or a dispersion thereof, which process includes the steps of: mixing together a cobalt salt and an organic polymer in an organic solvent so as to obtain a mixture; and heating/refluxing the mixture at a predetermined temperature so as to cause core-shell type cobalt oxide microparticles to precipitate, wherein the cobalt salt is cobalt acetate; and uses of the cobalt oxide microparticles, the dispersion and the dry powder.

The invention belongs to the technical field of fuel cell catalyst preparation, and discloses a preparation method of Co/N/C catalyst for hydrogen precipitation reaction. Cobalt acetate tetrahydrate and polyacrylonitrile are dissolved in an N, N-dimethylformamide solvent and carbon nanowires containing cobalt acetate are prepared by electrospinning, and then the catalyst is prepared by a muffle furnace and a tube furnace through program-controlled temperature rise. The catalyst prepared by the invention has good morphology, uniform nanowire diameter and high purity, and has good catalysis in HER chemical reaction.

The invention provides a NiCo/C@CNT double-conductive network hierarchical structure material, and a preparation method and an application thereof. Nickel acetate tetrahydrate and cobalt acetate tetrahydrate which are used as metal sources and 2,5-dihydroxyterephthalic acid which is used as an organic ligand undergo a refluxing reaction at 80-110 DEG C for a period of time in ultrapure water usedas a reaction solvent to obtain orange-yellow precipitate, and the obtained product is centrifuged, washed and dried, and finally is calcined at 500-800 DEG C in an inert atmosphere for 1-4 h to obtain the NiCo/C@CNT double-conductive network wave-absorbing material. The hierarchical structure is formed after carbon nanotubes are generated in situ, so that the NiCo/C@CNT double-conductive networkhierarchical structure material has an excellent electromagnetic wave-absorbing performance as a wave-absorbing material.

The invention provides a method for preparing floriform cobalt magnetic powder by using deionized water, glycol and hydrazine hydrate as solvents and cobaltous acetate as a raw material. The method comprises the following simple steps of: dispersing 1.25 grams of cobaltous acetate in 15 milliliters of a glycol solution, preparing 6.66 M of a sodium hydroxide solution, pouring the two solutions into polytetrafluoroethylene, mixing fully, and adding 5 milliliters of hydrazine hydrate, wherein a ratio of the deionized water to the glycol to the hydrazine hydrate is 3:3:1, and the filling amount is 4/5; arranging a cylinder sleeve by using a bushing, keeping the temperature of 180 DEG C for 4, 12, 24 and 36 hours; and cooling to the room temperature naturally, collecting a mother solution, cleaning precipitates repeatedly, separating by using a permanent magnet, collecting and drying to obtain the cobalt magnetic powder. The method has the advantages of simplicity, high dispersity, and crystallinity and the like, and can be widely applied to related industry of magnetic liquid, coatings, medicinal orientation, rechargeable batteries, catalysts and the like; and raw materials are low in cost, the process is simple, and large-scale industrial production is easy to realize.

The invention discloses a method for preparing nano hydroxyl manganese cobalt oxide. The method comprises the following steps: (1) adjusting the pH (Potential of Hydrogen) value of a mixed solution of manganese acetate and cobalt acetate to 2.5 to 6; (2) introducing oxidizing gas into the mixed solution of the step (1) and carrying out an oxidization reaction; after the reaction, centrifuging, washing and drying to obtain the nano hydroxyl manganese cobalt oxide. By adopting the preparation method provided by the invention, the nano hydroxyl manganese cobalt oxide can be processed through one step; the nano hydroxyl manganese cobalt oxide can be applied to related fields of super-capacitors, lithium-ion batteries and the like. The preparation method provided by the invention has the advantages that raw materials are cheap and easy to obtain, the cost is low and a synthesis process is simple and easy to realize; the quality of a product is stable and the process repeatability is good; the reaction can be finished within relatively short time and the efficiency is high.

The invention belongs to the technical field of porous organic catalyst preparation, and discloses a preparation method of a hypercrosslinked porous organic polymer supported cobalt catalyst, which comprises the following steps: dissolving tetraphenylporphyrin, dibromo-p-xylene and N-methylimidazole in a 1, 2-dichloroethane solvent in a nitrogen protection state to obtain a mixed solution A; adding aluminum chloride into the mixed solution A, and then sequentially stirring in an oil bath, quenching, washing, purifying and drying to obtain an intermediate product B; dissolving cobalt acetate in deionized water to obtain a solution C; adding an acetonitrile solution containing the intermediate product B into the solution C, stirring at room temperature, centrifugally separating, washing and drying to obtain a target product D; the formed polymer can catalyze CO2 and epoxide to generate cyclic carbonate, the CO2 adsorption capacity is greatly improved, and CO2 is efficiently converted in a normal-pressure environment.

The invention discloses a preparation method of a 2,6-diaminopyridine condensed 4-carboxybenzaldehyde bis-schiff base cobalt complex. The preparation method takes 2,6-diaminopyridine and 4-carboxybenzaldehyde as raw materials and absolute ethyl alcohol as a solvent to prepare 2,6-diaminopyridine condensed 4-carboxybenzaldehyde bis-schiff base, without the need of adding a catalyst; the 2,6-diaminopyridine condensed 4-carboxybenzaldehyde bis-schiff base is used as a ligand to react with cobalt acetate in an alkaline water solution, so as to prepare the 2,6-diaminopyridine condensed 4-carboxybenzaldehyde bis-schiff base cobalt complex. According to the method disclosed by the invention, the catalyst does not need to be added; the method has the advantages of simple technology, good repeatability and high yield and is convenient for popularization and application.

The invention discloses a preparation method of an electrocatalyst for oxygen evolution reaction, which comprises the following steps: (1) ventilating and drying 200-250g of goat blood at 80-95 DEG Cfor 5-7h, and grinding and crushing the dried goat blood; (2) carbonizing the powder obtained in step (1) to obtain a precursor; (3) mixing the precursor obtained in step (2) with 28-32ml of cobalt acetate solution or nickel acetate solution, and carrying out hydrothermal reaction for 2-3h; and (4) washing the product obtained in step (3) with de-ionized water and drying the product to obtain an electrocatalyst. The raw materials come from a variety of sources, are easily available, and cost low. The preparation process is simple. The preparation method can be used in large-scale production. The finished product has good catalytic performance. A catalyst with oxygen evolution reaction over-potential of 400-420 mV and TAFEL slope of 83-110mV/dec can be obtained. The performance is greatly improved compared with the existing common Pt/C catalyst.

The invention discloses a preparation method and application of a zeolite imidazate framework material ANA-[Co (eIm) 2]. The preparation method comprises the following steps: sequentially mixing cobalt acetate tetrahydrate, 2-ethylimidazole and solvent ethanol according to a molar ratio of divalent metal Co salt to 2-ethylimidazole to ethanol of 1: (6-12): (120-270) at room temperature, and reacting at 120-150 DEG C for 1-2 days; and after the reaction is finished, cooling, washing the obtained sample with ethanol for multiple times, filtering at room temperature, and drying to obtain the product ANA-[Co (eIm) 2]. The invention also provides application of the zeolite imidazate framework material ANA-[Co (eIm) 2] in adsorption separation of a mixed aqueous solution of low-concentrating furfural and 5-hydroxymethylfurfural.

The invention relates to an arachnoid cobalt sulfide powder and a preparation method thereof. The method comprises the following steps: 1, carrying out a solvothermal reaction on cobalt acetate and thioacetamide at 150-170 DEG C to obtain a reaction solution A; and 2, washing and drying a product in the reaction solution A to obtain the arachnoid cobalt sulfide powder. The final product is directly synthesized from the cobalt acetate and thioacetamide by adopting the one-step solvothermal reaction, the particle size of the product is in the nanoscale, the product has a large specific surface area, and the formed pores provide a buffer area for volume expansion generated in the charging/discharging process, so the material has a stable stability, and has excellent performances when used asa potassium ion battery negative electrode material; and the preparation method has the advantages of low synthesis temperature, simple synthesis path, no large instruments or harsh reaction conditions, and suitableness for large-scale production.

The invention discloses a preparation method of a 2,6-diaminopyridine condensed 3-carboxybenzaldehyde bis-schiff base cobalt complex. The preparation method takes 2,6-diaminopyridine and 3-carboxybenzaldehyde as raw materials and absolute ethyl alcohol as a solvent to prepare 2,6-diaminopyridine condensed 3-carboxybenzaldehyde bis-schiff base, without the need of adding a catalyst; the 2,6-diaminopyridine condensed 3-carboxybenzaldehyde bis-schiff base is used as a ligand and reacts with cobalt acetate in an alkaline water solution to prepare the 2,6-diaminopyridine condensed 3-carboxybenzaldehyde bis-schiff base cobalt complex. According to the method disclosed by the invention, the catalyst does not need to be added; the method has the advantages of simple technology, good repeatability and high yield and is convenient for popularization and application.

A preparation method of a manganese-containing electrode material is characterized by comprising the following steps of: dissolving 6mmol of EDTA-2Na and 5.25 mmol of manganese acetate in a mixed solution of water and ethanol, stirring and dissolving; adding 20 mmol of KF into the solution obtained in the previous step; dissolving cobalt acetate into water, and dropwise adding the solution into the coexisting liquid under continuous stirring; dividing the coexisting liquid into three parts, continuing to react at 30 DEG C, 40 DEG C and 50 DEG C respectively, carrying out centrifugal separationto obtain solid products, and marking the solid products as K (Mn<0.95>Co<0.05>) F<3>-30, K (Mn<0.95>Co<0.05>) F<3>-40 and K (Mn<0.95>Co<0.05>) F<3>-50 respectively; and washing the solid products with ethanol and distilled water for multiple times, collecting and drying the solid products at 60 DEG C for later use. The method can effectively inhibit the dissolution of manganese in the electrolyte, and can effectively improve the cycle performance of manganese.

A process that can be used as catalyst in esterification, transesterification or polycondensation is disclosed, which comprises a stable solution comprising (a) titanium in the form of a titanium α-hydroxycarboxylic acid or its salt, (b) a C₁-C₆ carboxylic acid, and (c) zinc in the form of a water-soluble zinc salt, and (d) water. Also disclosed is an esterification, transesterification or polycondensation process, which comprises contacting, in the presence of the solution process, an organic acid or its ester or its salt with an alcohol, optionally in the presence of a phosphorus compound, an organic or inorganic toning agent such as cobalt acetate, or combinations thereof. The process can also comprise combining aqueous solutions of a titanium α-hydroxycarboxylic acid or its salt and a zinc salt in an alcohol to produce an alcohol solution contacting the alcohol solution with a mixture comprising organic acid or its ester or its salt and a second alcohol, or comprise combining an aqueous solutions of a titanium α-hydroxycarboxylic acid or its salt and aqueous solution of a zinc salt with the mixture.

The invention relates to a Co-Mn-Cu compound oxygen reduction catalyst material for high voltage platform and a preparation method thereof. The preparation method is characterized by specifically comprising the following steps of: firstly, dissolving potassium permanganate in deionized water to form a solution I; then dissolving cobaltous acetate in the deionized water and then preparing a mixed solution II by the cobaltous acetate solution and a manganous nitrate solution; then slowly adding the mixed solution II into the solution I in a stirring condition to form a mixed solution III; mixing a copper nitride solution with the mixed solution III to prepare a mixed solution IV; adjusting the pH value of the mixed solution IV to 10-12 and putting the mixed solution IV in a constant temperature water bath to stir; and performing suction filtration and washing for three times, drying and sintering. The material provided by the invention has the advantages of being simple in preparation process, low in cost of raw materials, easy to produce on a large scale, high in oxygen reduction catalytic activity, high in stability and long in service life and etc, and can better solve the problem that the application of a metal air battery is further limited in an existing material and system.

The invention discloses a method for preparing rosin pentaerythritol ester, which belongs to the technical field of rosin deep processing. The present invention uses the following raw materials in parts by weight: rosin 100, sodium phosphite 0.0001-0.0002, xylene 5-8, 4,4`-thiobis(6-tert-butyl-3-methylphenol) 0.001-0.002, Pentaerythritol 15-25 and cobalt acetate 0.01-0.02; including refining rosin first, adding sodium phosphite, xylene, 4,4`-thiobis(6-tert-butyl-3-methylphenol), Pentaerythritol and cobalt acetate are then heated to 200°C to 220°C at 0MPa to 0.01MPa, stirred at constant temperature, and reacted for 2 hours to 4 hours, and then distilled at 0MPa to 0.01MPa and 270°C to 280°C. The product rosin pentaerythritol ester prepared by the invention has the advantages of high softening point and high purity.