19 results about "Cobalt acetate" patented technology

The application provides a method for improving the yield of oxygen-containing compounds in low-rank coal-derived soluble matters, and belongs to the technical field of low-rank coal pretreatment, and comprises the following steps: first, performing ozone oxidation pretreatment on low-rank coal to obtain modified low-rank coal; using cobalt acetate, copper acetate and iron acetylacetonate as a cobalt source, a copper source and an iron source respectively, using hydrazine hydrate as a strong reducing agent, and using a one-pot hydrothermal method to obtain magnetic Co-CuFe2O4 nanospheres; and using the prepared Co-CuFe2O4 nanosphere catalyst to perform catalytic ethanolysis reaction on the low-rank coal subjected to ozone oxidation pretreatment. In the application, appropriate ozone oxidation pretreatment can effectively improve the activity of the low-rank coal, and when the magnetic Co-CuFe2O4 nanospheres are applied to catalytic ethanolysis reaction of the low-rank coal subjected to ozone oxidation pretreatment and catalytic ethanolysis reaction of low-rank coal-related model compounds, the magnetic Co-CuFe2O4 nanospheres all exhibit excellent catalytic activity, higher-yield soluble components can be obtained, the yield of oxygen-containing compounds in the derived soluble matters is improved, and efficient and high-value utilization of the low-rank coal is realized.

This invention discloses a method for coupling physicochemical treatment and biodegradation of plastics. The method includes the following steps: S1. Mixing plastics, organic solvents, and a metal catalyst, and reacting to degrade them to obtain organic products. The metal catalyst is cobalt acetate and / or manganese acetate; S2. Biodegrading the organic products from step S1 using a mixed colony, which includes *Pseudomonas*, *Bacillus*, *Flavobacterium*, and *Rhodococcus*. This invention uses cobalt acetate and / or manganese acetate as metal catalysts. The catalytic oxidation of the metal catalyst can efficiently depolymerize traditional plastics, overcoming the bottleneck of C-C bond breaking that is difficult for microorganisms to achieve. It can successfully convert plastics into organic products mainly composed of dicarboxylic acids, benzoic acid, and terephthalic acid, and the mixed colony process completely mineralizes the organic products. This method achieves complete removal of plastics without producing any toxic or harmful substances.

The application provides an electrochemical synthesis method of glycine, improves catalytic activity of nitrate reduction and C-N coupling process through atom-dispersed Co-N active sites, and improves mass transfer efficiency through ordered mesoporous structure, thereby relieving the problem of limited substrate diffusion in the reaction process, so that higher glycine Faraday efficiency and yield can be obtained; through taking cobalt acetate tetrahydrate, 1,10-phenanthroline and magnesium hydroxide as raw materials, and sequentially performing reflux coordination, high-temperature pyrolysis and acid washing template treatment, uniform anchoring and atomic-level dispersion of cobalt species in the carbon skeleton can be realized, agglomeration of cobalt particles in the heat treatment process is avoided, and therefore the utilization rate and catalytic activity of cobalt active sites are significantly improved. Meanwhile, the magnesium hydroxide as a template material is removed in the subsequent acid washing process, and rich mesoporous structure can be formed in the catalyst, which is beneficial to rapid diffusion and mass transfer of reactants, intermediates and products, and diffusion limitation in the reaction process is relieved.

This invention discloses a ZIF-derived cobalt-based microwave absorbing and thermally conductive composite material and its preparation method, belonging to the field of microwave absorbing and thermally conductive composite material preparation. The invention first synthesizes a B / P in-situ doped ZIF-7 precursor at room temperature, then encapsulates it with tannic acid, and then reacts it in a methanol solution of cobalt acetate tetrahydrate to obtain a ZIF precursor. The obtained ZIF precursor is then calcined at high temperature to obtain a ZIF derivative with a cobalt single atom, cobalt nanoparticles, and a B / P-N co-doped porous carbon structure. This derivative is uniformly dispersed in an aqueous polyurethane matrix and polymerized to obtain a flexible microwave absorbing and thermally conductive composite material. The material obtained by this invention possesses both efficient electromagnetic wave absorption and thermal conductivity, and can be used to prepare integrated electromagnetic compatibility and thermal management structures for integrated circuit chips, thus showing good application prospects and significant economic benefits.

The application provides a cobalt acetate crystal preparation method based on waste cobalt residue and the cobalt acetate crystal. The preparation method comprises the following steps: S1, hydrogen reduction is performed on the waste cobalt residue to obtain a reduction product; S2, the reduction product is added into an inorganic acid solution, and a cobalt salt product is obtained through first stirring; S3, the cobalt salt product is added into an inorganic alkali solution, and a precipitation product and a residual liquid are obtained through second stirring; S4, the precipitation product is mixed with acetic acid, and the cobalt acetate crystal is obtained after reaction; the waste cobalt residue is a cobalt-containing waste catalyst generated in the oxidation reaction of trimethylphenol to trimethylbenzoquinone by using a supported cobalt catalyst. Through the design and optimization of the reduction, dissolution, precipitation and reaction steps of the waste cobalt residue, the waste cobalt residue is effectively utilized, the recycling of resources is realized, the cobalt acetate crystal prepared has high purity, low impurity content and good application performance.

The application provides a synthesis method of high-hygroscopic-dispersing-dye easy-to-dye functional polyester, which comprises the following steps: step one, esterification one-pot; step two, esterification two-pot; step three, final polymerization pot (polycondensation); and step four, discharging and slicing. The polyester is prepared by a continuous polymerization or an intermittent polymerization mode, p-terephthalic acid, ethylene glycol and ethylene glycol antimony are added in the esterification one-pot, polyethylene glycol, nano montmorillonite, cobalt acetate, stabilizer Irganox1010 and triphenyl phosphite are added in the esterification two-pot; the low-temperature coloring and the hygroscopic property of the polyester are realized by adding the polyethylene glycol, the easy-to-dye and the hygroscopic property of the polyester are realized by adding the nano montmorillonite, the ethylene glycol antimony is added as a catalyst, the polymerization reaction and the stability of the polyester are realized by adding the cobalt acetate, the stabilizer Irganox1010 and the triphenyl phosphite, and finally the easy-to-dye and the hygroscopic effect of the polyester are realized.

The application discloses a preparation method of a low-noble-metal heterojunction fuel cell catalyst, which comprises the following steps: (1) preparing Pt-Co alloy nanoparticles; (2) preparing a cobalt acetate ethanol solution, placing the Pt-Co alloy nanoparticles in the cobalt acetate ethanol solution, stirring, growing a cobalt acetate film layer on the outer surface of the Pt-Co alloy nanoparticles, and obtaining the low-noble-metal heterojunction fuel cell catalyst. The preparation method can effectively reduce the use of Pt, reduce the preparation cost of the catalyst, and is suitable for large-scale application. The low-noble-metal heterojunction fuel cell catalyst has high oxygen reduction activity and can effectively improve the catalytic reaction efficiency.

The application belongs to the technical field of electrochemical energy storage materials, and particularly relates to a cobalt Prussian blue positive electrode material and a preparation method and application thereof. The application uses sodium citrate dihydrate as a structure directing agent, forms a precursor solution by dissolving sodium citrate dihydrate and cobalt acetate in water together, drops the precursor solution into a potassium cobalt cyanide aqueous solution in a linear manner, stirs the reaction under a fixed rotating speed, and obtains the cobalt Prussian blue positive electrode material after freeze-drying. The application realizes precise construction of the nanostructure of the product by regulating the coordination environment of sodium citrate and cobalt ions and the dropping process. The obtained material is composed of highly dispersed and uniform nanocubes, has high crystallinity and no agglomeration. When the material is used as a positive electrode of a water-based zinc ion battery, it has high specific capacity, excellent rate performance and super-long cycle stability, and has a wide application prospect in the field of large-scale energy storage.

The present application relates to the technical field of catalyst preparation, in particular to a Co-N-C catalyst and its application in the synthesis of glycolic acid from glycol, which comprises the following steps: step one: adding cobalt acetate tetrahydrate and 1,10-phenanthroline into a solvent to mix, obtaining a mixture, heating the mixture in an oil bath, then adding a template agent into the heated mixture to stir; step two: removing the solvent in the mixture by rotary evaporation to obtain a mixed solid, grinding the mixed solid into fine powder after vacuum drying; step three: pyrolyzing the fine powder under a nitrogen atmosphere to obtain a pyrolysis product; step four: treating the pyrolysis product with acid washing to remove the template agent, then vacuum drying to obtain the Co-N-C catalyst; the present application solves the problems of low catalyst activity, poor selectivity, poor stability and high cost of noble metal catalysts in the existing technology of catalytic dehydrogenation of glycol to glycolic acid.

The application discloses a preparation method of a black phosphorus / metal organic framework composite water splitting electrocatalyst, adopts an electrochemical exfoliation method and an ultrasonic exfoliation method in combination to prepare an ultrathin thin layer BP (FL-BP); the ultrathin thin layer BP is added into a methanol solution of cobalt acetate, a 2-methyl imidazole methanol solution is added while stirring, and then standing, centrifugation, alcohol washing and drying are carried out; the obtained product is heat treated under an inert atmosphere to obtain the black phosphorus / metal organic framework composite water splitting electrocatalyst; the application has the advantages of mild and safe reaction conditions, high product yield, low production cost, good economic benefits and application prospect; the obtained black phosphorus / metal organic framework composite water splitting electrocatalyst has a water splitting potential as low as 1.64 V under a current density of 10 mA cm ‑2 After 2000 cycles of water splitting electrocatalysis test, the overpotential only increases by 9 mV, and the defect of poor stability of black phosphorus nanosheet is overcome.

The application belongs to the field of environmental catalysis technology, and relates to a preparation method of low-temperature high-crystalline samarium calcium cobaltite perovskite oxide and application of the low-temperature high-crystalline samarium calcium cobaltite perovskite oxide in catalytic oxidation of toluene. The preparation method comprises the following steps: step 1, dissolving samarium nitrate hexahydrate and cobalt acetate tetrahydrate in water to obtain a first solution, and dissolving citric acid monohydrate and urea in water to obtain a second solution; step 2, under the condition of stirring at room temperature, the second solution is added dropwise into the first solution to obtain a mixed metal salt solution; step 3, the mixed metal salt solution is heated to a preset temperature and stirred until a transparent wet gel is generated; step 4, the transparent wet gel is dried to obtain a foamed dry gel; and step 5, the foamed dry gel is ground into a powder, and the powder is calcined under an air atmosphere to obtain a powder solid phase. The low-temperature high-crystalline samarium calcium cobaltite perovskite oxide prepared by the application has the advantages of low energy consumption, low cost, large specific surface area, high crystallinity, high catalytic activity, good stability and strong water resistance.

A method for constructing a lithium-rich manganese cathode material with an amorphous protective layer and a locally spinel-disordered phase periodically alternating composite structure involves adding lithium acetate, nickel acetate, cobalt acetate, manganese acetate, and citric acid monohydrate complexing agent to deionized water and mixing thoroughly. Then, aminosulfonic acid is added and stirred until homogeneous, yielding a precursor salt solution. The precursor salt solution is then subjected to spray pyrolysis to prepare precursor powder. Finally, the precursor powder is calcined at high temperature in a muffle furnace to obtain modified lithium-rich manganese-based cathode material powder. The advantages are: this method helps reduce side reactions during cycling and improves the efficiency of lithium-rich manganese cathode materials. + Improving the diffusion rate and suppressing harmful phase transitions during cycling can significantly enhance the stability of materials, slow down voltage decay, and improve cycling performance and voltage retention.

This invention relates to a method for preparing spherical carbon-coated FeCo2O4 nanocatalysts and their applications, belonging to the field of hydrogen storage material catalysts. The preparation method involves mixing ferric chloride hexahydrate, cobalt acetate tetrahydrate, nickel acetate tetrahydrate, and terephthalic acid to obtain a mixed aqueous solution. This solution is then placed in a polytetrafluoroethylene-lined high-pressure reactor, heated to 180°C at a rate of 5°C / min, and held at this temperature for 8-12 h for a solvothermal reaction. After cooling, separation, washing, and drying, a light yellow precursor powder is finally obtained. This invention, through the rational proportioning of different raw materials and high-temperature, high-pressure reaction, grinding, calcination, and cooling (calcination temperature 400°C), obtains spherical carbon-coated FeCo2O4 nanocatalysts with excellent catalytic performance, significantly improving the hydrogen absorption and desorption kinetics of MgH2.

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 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 application discloses a cobalt monatomic catalyst with controllable loading and coordination configuration and a preparation method and application thereof, relates to the technical field of material engineering and environmental engineering, and the catalyst is prepared by the following method: organic ligands (oxalic acid, ethylenediaminetetraacetic acid, citric acid and the like) are respectively combined with cobalt acetate tetrahydrate to form cobalt-containing complexes, then the cobalt-containing complexes are combined with cyanuric acid and melamine to perform hydrogen bond assembly, and a supramolecular solid is constructed; then pyrolysis is performed under an argon atmosphere; by means of the anchoring mode and the difference between the internal sites of the carbon nitride carrier, the cobalt monatomic catalyst with controllable coordination configuration is prepared; by means of ligand complexation, ion replacement and carrier modification strategies, the cobalt monatomic catalyst with controllable cobalt loading and nitrogen / carbon structure is constructed, the coordination environment of cobalt sites is essentially optimized, the non-radical selectivity generation capacity is improved, and a green, efficient and beneficial technical scheme for improving the biodegradability is provided for the treatment of wastewater containing chlorophenol pollutants.

The application discloses a preparation method of lithium ion battery positive electrode material based on a sol-gel method, which comprises the following steps: dissolving cobalt acetate tetrahydrate, manganese acetate tetrahydrate, lithium hydroxide monohydrate and citric acid in deionized water, heating by using an oil bath pot, obtaining dry gel, performing long-time vacuum drying at a certain temperature, removing water to obtain porous fluffy gel with holes; grinding the fluffy gel into uniform powder, pre-burning in a tube furnace under an air atmosphere, then taking out the powder, regrinding, gradually heating to different temperatures at a slow heating rate under an oxygen atmosphere, slowly reducing to room temperature, and completing the preparation of the lithium ion battery positive electrode material. The lithium ion battery positive electrode material synthesized at a calcination temperature of 800 DEG C has good electrochemical performance, the particle size of the product is appropriate, the surface area is optimal, and the electrochemical performance is good.