19 results about "Cobalt metal" patented technology

The application discloses a kind of bifunctional catalyst and its application in microwave-assisted preparation of biodiesel, belong to catalysis technical field.The application introduces cobalt metal in ZIF-8 skeleton, when MOFs derivative is prepared by calcination, the introduction of transition metal can construct magnetic center, adjust the magnetic loss ability of derivative material, so that the prepared catalyst has strong wave-absorbing performance under 2.45GHz industrial microwave field, can effectively absorb microwave energy and convert it into heat energy, thereby improving the energy utilization efficiency of reaction system, and finally improving the catalytic performance of catalyst, further improve the preparation efficiency of microwave-assisted biodiesel, and has good application value and prospect in catalysis technical field.

This application provides a method for recovering nickel and cobalt elements, which involves acid leaching a mixed slurry comprising laterite nickel ore and a hard material to separate a solution containing nickel and cobalt elements; wherein the hard material comprises quartz sand and / or mullite. This recovery method utilizes the high hardness of the hard material to achieve online cleaning of scale layers inside the reactor, thus avoiding contamination of the acid leaching system and solving the problem of scale accumulation inside the reactor, thereby effectively improving the production efficiency of nickel and cobalt metals.

This invention belongs to the field of catalyst preparation technology, specifically disclosing a hydrotalcite-derived metal oxide catalyst, its preparation method, and its application. The preparation method includes the following steps: dissolving cobalt and aluminum metal salts in deionized water to obtain solution A; dissolving copper metal salt in deionized water to obtain solution B; preparing an alkaline precipitant solution C containing hydroxide and carbonate ions; under heating conditions, adding solution C dropwise to solution A while vigorously stirring, adjusting the pH to alkaline, obtaining a mixed solution; simultaneously titrating solution B and solution C together into the mixed solution, adjusting the pH to alkaline, aging the reaction, washing, drying, grinding, and calcining in an oxygen atmosphere to obtain the hydrotalcite-derived metal oxide catalyst. This hydrotalcite-derived metal oxide catalyst can promote the adsorption and conversion of NH3 and the generation of N2, showing good application prospects in the selective catalytic oxidation and degradation of NH3.

The application provides an oxygen-coordinated cobalt monatomic catalyst, a preparation method and application thereof. The oxygen-coordinated cobalt monatomic catalyst is composed of a porous carbon skeleton, cobalt monatomic and oxygen atoms. The specific surface area of the porous carbon skeleton is 100-3000 m 2 / g, the mass content of the cobalt monatomic is 0.01%-10%, and the mass content of the oxygen atoms is 1%-15%. The catalyst anchors the cobalt metal center by using an oxygen-rich metal organic framework, and forms Co-O-C after carbonization. In the oxygen-coordinated cobalt monatomic catalyst, the oxygen-coordinated structure can adjust the electronic structure of the central metal cobalt to promote the transfer of active sites, provide the optimal adsorption energy of the intermediate OOH, and thus improve the selectivity of 2e ‑ ORR.

[Problem] To provide a surface-treated galvanized steel sheet, a resin film-coated steel sheet, and a building panel having excellent corrosion resistance or processing adhesion with a resin film. [Solution] A surface-treated galvanized steel sheet comprising a steel sheet, a zinc plating layer formed on the steel sheet, a first chemical treatment coating layer formed on the zinc plating layer containing cobalt metal in an amount of 5 mg / m² or more and less than 30 mg / m², and a second chemical treatment coating layer formed on the first chemical treatment coating layer comprising (a) a zirconium component, (b) a bonding component based on the dehydration condensation of a silanol group, and (c) a urethane bonding component.

The application discloses a zeolite imidazolate framework / polyimide nanofiber composite membrane material based on cobalt metal defects and a preparation method and application thereof, constructs a nanofiber membrane with polyimide as a base, secondly, adopts an in-situ synthesis method of first impregnating a cobalt salt and then introducing a ligand, makes ZIF-67 nucleate and grow on the surface of the PI fiber, forms a firm anchoring structure, prevents particle agglomeration and ensures uniform distribution of active sites, finally, introduces controllable metal defects by immersing in a second metal salt solution, breaks the crystal symmetry to increase unsaturated coordination sites, significantly enhances the electrostatic adsorption and chemical capture capacity on fine particulate matters, simultaneously optimizes the pore structure, strengthens the interception effect under the premise of not increasing the pressure drop, and realizes the high-efficiency-low-resistance balance. The composite structure has high removal rate, low pressure drop and excellent flexibility.

This invention discloses a method for preparing a zirconium-based metal-organic framework@nickel-cobalt metal-organic framework oxygen reduction catalyst and its application in the removal of chloramphenicol. The method uses a nickel-cobalt metal-organic framework as a substrate, and fuses a zirconium-based metal-organic framework onto it via a hydrothermal method to form an octahedral zirconium-based metal-organic framework@nickel-cobalt metal-organic framework. This structure significantly improves the accessibility of adsorption sites and electrocatalytic active sites while maintaining the structural integrity of the metal-organic framework. The oxygen reduction performance was tested, and the system was coupled with an electroactive biofilm to determine the degradation efficiency of chloramphenicol within 244 hours. The results show that the zirconium-based metal-organic framework@nickel-cobalt metal-organic framework exhibits excellent oxygen reduction performance. In the modified microbial fuel cell, the degradation efficiency of chloramphenicol reached 90.31% within 244 hours, and the concentration decreased from 18.62 mg / L to 1.80 mg / L. This study provides a new approach for constructing efficient and stable metal-organic framework-based electrocatalysts, and has good application prospects in the fields of antibiotic wastewater treatment and environmental remediation.

This invention discloses an A3B-type cobalt porphyrin-bismuth oxyhalide composite material, its preparation method, and its application in photocatalytic CO2 reduction. The composite material is a heterojunction structure composed of an A3B-type cobalt porphyrin and a bismuth oxyhalide, wherein the bismuth oxyhalide is Bi3O4Br, and the A3B-type cobalt porphyrin is 5-(4-carboxyphenyl)-10,15,20-tris(4-methoxyphenyl)porphyrin cobalt(II). The composite material of this invention effectively solves the technical problem of low CO2 conversion rate due to the difficulty in directional separation of photogenerated carriers in existing bismuth oxyhalide photocatalysts, exhibiting excellent light absorption performance and photocatalytic reduction of CO2 to CO.

This application provides a method for recovering cobalt from a cobalt-containing solution in a hydrometallurgical zinc smelting process, relating to the field of hydrometallurgy. The method includes: reacting the cobalt-containing solution with an organic ligand and an oxidant to obtain a cobalt-precipitated liquid and a cobalt-containing precipitate; subjecting the cobalt-containing precipitate to a liquid-phase conversion treatment under closed conditions to obtain a cobalt-rich intermediate; mixing the cobalt-rich intermediate with dilute sulfuric acid to obtain a cobalt-rich solution; extracting the cobalt-rich solution with an extractant to obtain a purified cobalt solution; and using the purified cobalt solution to prepare a cobalt-containing product, which includes at least one of cobalt sulfate, cobalt tetroxide, and metallic cobalt. This application enables efficient separation and extraction of cobalt from a cobalt-containing solution in a hydrometallurgical zinc smelting process and can prepare high-value-added cobalt-containing products. The overall cobalt recovery rate of this application is greater than 93%, and the purity of the cobalt-containing product can reach over 99.5%. This application achieves efficient and high-value utilization of cobalt resources in the hydrometallurgical zinc smelting process.

This utility model discloses an electrolysis system and its metal deposition apparatus, including a cathode plate for depositing a metal plate, the cathode plate having at least one metal deposition surface; a retaining member is fixedly connected to the edge of the cathode plate, adapted to restrict the deposited metal plate from separating from the metal deposition surface, the retaining member being configured as an insulator to prevent it from being encapsulated by the deposited metal; wherein, a deposition space suitable for metal deposition is formed between the retaining member and the cathode plate, the metal deposited in the deposition space is integrated with the metal plate, so that the metal plate is held together with the cathode plate under the retaining force applied by the retaining member. This electrolysis system and its metal deposition apparatus eliminate the need for the fabrication of a starter sheet in conventional processes, directly electrolyzing 5-15 mm nickel and cobalt metal plates on the cathode plate.

The present application relates to a kind of three-dimensional porous electrode of trace gold quick recovery and its preparation method and application, the preparation method includes, electrode matrix is mixed with cobalt metal organic framework precursor liquid, and precursor electrode is obtained;The precursor electrode is mixed with nickel-containing solution, and solvent thermal reaction is carried out, and intermediate electrode is obtained;Intermediate electrode is mixed with sulfur-containing solution, and solvent thermal reaction is carried out, and three-dimensional porous electrode of trace gold quick recovery is obtained.The pore structure of three-dimensional porous electrode constructed in the present application has a large number of adsorption active sites, not only can rapidly adsorb low concentration Au (S2O3) 2 3‑ In a short time, it can also achieve the reduction recovery of gold at lower voltage.In addition, the scope of application is wider, and the recovery rate of Au (S2O3) 2 3‑ In the concentration range of 0.2-10ppm is more than 95%.

This invention provides a chemical mechanical polishing slurry comprising abrasive particles, a five-membered nitrogen-containing heterocyclic compound, an organic acid, an amino acid, an oxidant, and water. The polishing slurry of this invention exhibits a high cobalt removal rate and a low titanium and silicon oxide insulating layer removal rate, thereby achieving a high cobalt-to-titanium / silicon oxide removal selectivity ratio and a low cobalt metal static corrosion rate, effectively reducing the risk of corrosion of cobalt wafers by the polishing slurry.

The invention relates to the technical field of new energy materials, and discloses a high-performance electrochemical catalyst and a preparation process thereof, and the preparation process comprises the following steps: preparing a composite carrier with a carbon nanotube vertically growing on the surface of graphene through a chemical vapor deposition method; introducing nitrogen and sulfur heteroatoms by adopting plasma-assisted vapor deposition; enabling the metal precursor to be uniformly adsorbed on the carrier in a laminar flow state by utilizing a micro-fluidic reactor; and finally, carrying out stepped heating pyrolysis and annealing treatment to obtain a finished product. The obtained catalyst has a three-dimensional conductive network structure containing rich through pore channels, and iron and cobalt metal active centers are anchored to defect sites of a carrier in a coordination form. According to the process, atomic-scale dispersion of active components is achieved through a microfluidic technology, lattice stress is effectively eliminated in cooperation with stepped pyrolysis, the problem that the activity and stability of the catalyst are difficult to consider at the same time is successfully solved, the oxygen reduction catalytic performance is improved, the cycle life is prolonged, and the mass transfer performance under the large-current working condition is excellent.

This invention discloses a three-dimensional cobalt metal-organic complex, its preparation method, and its applications, belonging to the field of crystal materials technology. This invention uses 2,5-diketopiperazine-N,N'-diacetic acid and 4,4'-bipyridine as raw materials with cobalt ions to prepare a compound with the chemical formula [Co(DPDA)(4,4'-bpy)]. n A three-dimensional cobalt-organic metal complex. It has a six-connected three-dimensional network structure with dual-core [Co2(COO)2] structural units, and its topological symbol is {3 12 0.4 24 0.5 9 Furthermore, the aforementioned three-dimensional cobalt metal-organic complex can rapidly activate peroxymonosulfate to effectively degrade dyes. It can degrade methylene blue, malachite green, and crystal violet to over 95.0% within 5 minutes, without producing toxic byproducts during the degradation process, and exhibits good reusability. Additionally, the synthesis conditions of the three-dimensional cobalt metal-organic complex are mild, the steps are simple, and it possesses excellent structural stability, good thermal stability, and antiferromagnetism at high temperatures.

This invention discloses a method for preparing a molybdenum-doped basic cobalt carbonate nanosheets@cobalt sulfide nanosheet array / nickel foam composite material as a supercapacitor electrode material. The purpose of this invention is to carefully design a core-shell structure composed of different components to improve the specific capacity and cycle performance of the electrode material. This invention mainly includes: 1. Hydrothermal synthesis to prepare cobalt-metal-organic framework / nickel foam (Co-MOF / NF); 2. Hydrothermal sulfidation to prepare cobalt sulfide nanosheet array / nickel foam (Co3S4 / NF); 3. Hydrothermal preparation of molybdenum-doped basic cobalt carbonate nanosheets@cobalt sulfide nanosheet array / nickel foam (Mo-CCH@Co3S4 / NF). This invention features a simple synthesis process, low cost, high yield, and no need for subsequent processing. The Mo-CCH@Co3S4 / NF heterostructure exhibits excellent electrical conductivity and stronger OH- ions. ‑ The Mo-CCH@Co3S4 / NF electrode exhibits enhanced capture capability, thereby improving the efficiency of rapid redox processes. At 1 A g... ‑1 It was 1816.2 C g at that time. ‑1 The specific capacitance at 10 A g ‑1 It exhibits excellent cycling performance of 87.5% over 10,000 cycles.

This invention discloses a catalyst for the electrocatalytic reduction of nitrate to ammonia and its preparation method, belonging to the field of industrial wastewater pollution control technology. The catalyst uses basic copper sulfate and cobalt tetroxide as dual active components, and its preparation method includes the following steps: (1) adding cobalt metal precursor, copper metal precursor, urea and ammonium persulfate to ultrapure water, stirring until completely dissolved, heating under high pressure, centrifuging, washing and drying to obtain catalyst material precursor; (2) calcining the catalyst material precursor and then rapidly cooling it to obtain basic copper sulfate material with Co3O4 dispersed on the surface. The catalyst prepared by this invention uses basic copper sulfate and Co3O4 as dual active components, and the two have a heterojunction synergistic effect, which can efficiently convert nitrate into ammonia, with excellent catalytic performance and high activity and selectivity.

This invention discloses a Co@CeO2 / NC composite nanoparticle catalytic material, its preparation method, and its applications, relating to the field of catalyst materials technology. The composite nanoparticle catalytic material comprises NC nanosheets and a Ce-O-Co coordination compound formed by cerium oxide and metallic cobalt and grown in situ on the NC nanosheets. This composite nanoparticle catalytic material not only effectively modulates the electronic structure of the 3d orbitals of Co atoms through the Ce-O-Co bond formed by the composite of cerium oxide and cobalt, achieving a synergistic effect between cerium oxide and cobalt, thereby optimizing the adsorption capacity of cobalt atoms for intermediates and greatly improving the reactivity of cobalt atoms; but also, by growing the Ce-O-Co coordination compound in situ on NC nanosheets, it significantly improves the contact area between cobalt atoms and catalytic reactants, the electron transfer rate, and the catalytic stability by utilizing the sufficient specific surface area provided by the nitrogen-carbon nanosheets and their excellent conductivity and structural stability.

The application discloses an anti-corrosion polyvinyl chloride insulated cable for aluminum alloy conductors and a production method thereof, and belongs to the technical field of fireproof cables. A flame-retardant encapsulated hollow carbon fiber ternary synergistic flame-retardant system is formed by a cobalt metal framework, ammonium polyphosphate and hollow carbon fibers. The cobalt metal framework is a high-efficiency Lewis acid catalyst, which can quickly catalyze ammonium polyphosphate to form a continuous and high-temperature-resistant composite carbon layer at high temperatures, thereby avoiding acid-base neutralization. The flame-retardant encapsulated hollow carbon fiber has the cobalt metal framework encapsulated in the hollow carbon fiber and the surface coated with ammonium polyphosphate. The special structure can make the hollow carbon fiber simultaneously serve as a physical barrier and a carrier, encapsulate the cobalt metal framework in the cavity, always maintain the catalytic activity of cobalt ions, fix the ammonium polyphosphate on the surface of the hollow carbon fiber by chemical bonds as the carrier, prevent the ammonium polyphosphate from being easily precipitated and migrated, and avoid the problems that the ammonium polyphosphate as a filler is easy to absorb moisture, easy to hydrolyze and poor in compatibility with a matrix.

The application belongs to the technical field of electrocatalytic materials, and provides a foam nickel loaded nickel cobalt metal organic framework catalyst, a preparation method and application thereof, and comprises the following steps: washing, drying, in sequence, the cut foam nickel under ultrasonic with nitric acid, ethanol and deionized water; uniformly mixing NiCl2·6H2O, CoCl2·6H2O and 2,5-thiophene dicarboxylic acid to obtain a mixed solution; dissolving the foam nickel and the mixed solution in a mixed solution of N,N-dimethylformamide and deionized water, and mixing and transferring in an ultrasonic machine to a polytetrafluoroethylene lined reaction kettle, and performing hydrothermal reaction; naturally cooling the reaction kettle, taking out the material, washing and vacuum drying. The preparation method is simple, the required raw materials and equipment are low in price, the production cost is low, can be applied to 1,4-cyclohexanedimethanol electro-oxidation to 1,4-cyclohexanedicarboxylic acid, the generated product is high in economic value, and is suitable for large-scale production.