25 results about "Nickel compounds" patented technology

The invention discloses a method for preparing high-purity nickel acetate from crude nickel carbonate in the technical field of nickel compound purification, which comprises the following steps: mixing the crude nickel carbonate with deionized water to obtain a suspension, and adding glacial acetic acid to react to obtain a nickel acetate solution; then a specially-made hierarchical-pore titanium silicalite molecular sieve loaded bimetallic nanocluster material is added for purification treatment, the material is obtained through precise preparation, the method comprises the steps of carrier modification, bimetallic loading, hydrophobic modification, activation balance and the like, and the material has excellent impurity adsorption capacity and chemical stability; carrying out concentration crystallization and solid-liquid separation on the purified solution to obtain wet nickel acetate crystals; the mother liquor is subjected to adsorption treatment again, crystals in the mother liquor are recycled, and finally all the crystals are combined and dried to obtain a high-purity nickel acetate product. The process is simple and efficient, the purity of the prepared nickel acetate exceeds 98.5%, the content of each impurity is superior to the industrial standard, and the mother liquor can be recycled, is environment-friendly and is suitable for industrial production.

The invention discloses a preparation method of high-dispersion superfine spherical nickel powder, which comprises the following steps: preparing nickel salt, a complexing agent and a dispersing agent into a nickel salt aqueous solution, converting a precipitant aqueous solution into precipitant micro-nano aerosol, adding the precipitant micro-nano aerosol into the nickel salt aqueous solution, and carrying out gas-liquid phase confinement micro-zone pre-reaction to obtain the high-dispersion superfine spherical nickel powder. And carrying out homogeneous hydrothermal reaction and vacuum roasting to obtain the high-dispersion superfine spherical nickel powder. According to the method, low-cost and low-pollution soluble nickel salt is used as a nickel source, aerosol confinement microcell reaction is established, controllable preparation of spherical nickel particles with high purity, high sphericity degree, high dispersity and uniform morphology is achieved, the high-dispersion superfine spherical nickel powder is effectively obtained under the conditions of low cost and low energy consumption, and the method is suitable for industrial production. The high-dispersion superfine spherical nickel powder meets the requirements of high-dispersion superfine spherical nickel powder required by inner electrode slurry of various sizes for the MLCC, meanwhile, the high-dispersion superfine spherical nickel powder has good fluidity, and preparation of high-performance inner electrode slurry of the MLCC is facilitated.

This invention relates to the field of conductive paste technology, and discloses a silver-coated nickel conductive paste for photovoltaic cells and its preparation method. The conductive paste comprises 65-85 parts of nickel-based alloy core@Ag composite powder, 15-30 parts of auxiliary silver powder, 2-4 parts of glass powder, 25-35 parts of organic carrier, and 0.2-0.8 parts of interface adaptant. The alloying element in the nickel-based alloy core is selected from one or more of P, B, and Si, with P content of 0.5%-5.0%, B content of 0.1%-2.0%, and Si content of 1.0%-4.0%. The interface adaptant is selected from organosilver or organonickel compounds. Alloying reduces the Ag / Ni interface energy to inhibit dewetting, and the interface adaptant is used to repair micro-defects in situ, improve the integrity of the silver shell, reduce contact resistance, and improve cell efficiency and reliability.

The invention discloses a supported Ni-based alloy catalyst preparation method, which comprises: S1, dissolving a tungsten compound in water, loading on an Al2O3 carrier through an impregnation method, aging, drying, and roasting in air to obtain an intermediate; and S2, dissolving a nickel compound in water, loading the nickel compound on the intermediate through an impregnation method, aging, drying, roasting in air, and performing reduction treatment in an H2 atmosphere to obtain the catalyst. The catalyst is high in activity, good in selectivity and stability, simple in preparation method and low in cost.

An electrode assembly, a secondary battery, and an electrical apparatus. The electrode assembly includes a positive electrode plate, a negative electrode plate and a separator. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one side surface of the positive electrode current collector. The positive electrode film layer in the present application includes a nickel-containing compound and a binder. A molar percentage content of a nickel element in the nickel-containing compound based on a total molar amount of transition elements is Y, and a mass percentage content of the binder in the positive electrode film layer is X; and it is satisfied: Y / X<53.

A method for producing a nickel compound, the method including: a step for preparing a starting material metal oxide which contains a first metal containing at least nickel and a second metal; a step for mixing the starting material metal oxide and an aqueous acid solution so as to obtain a first solution that contains ions of the first metal and the second metal by acid leaching; a first generation step for neutralizing the first solution with a first alkali so as to generate a solid content that contains the second metal and a second solution that contains at least ions of the first metal; a step for solid-liquid separating the second solution and the solid content; a second generation step for mixing the second solution and a second alkali that contains at least a metal hydroxide and ammonia so as to generate a nickel compound that contains at least nickel as the first metal and a third solution; and a step for solid-liquid separating the nickel compound and the third solution.

The application relates to the technical field of preparation of new carbon materials, and discloses a nano carbon cage and a preparation method and application thereof, the preparation method comprising the following steps: (1) physically mixing pitch and a nickel-containing compound, and then baking to obtain an intermediate product; wherein the softening point of the pitch is 130-300 DEG C; the baking temperature is 700-1200 DEG C, and the time is 60-240 min; (2) acid washing the intermediate product. The preparation method of the nano carbon cage can effectively improve the carbon yield and reduce the raw material cost by using pitch as a carbon source without using a template agent; the prepared carbon cage has high graphitization degree, thin cage wall, good specific capacity and good rate performance.

The invention discloses a cracking catalyst and a preparation method and application thereof, the cracking catalyst comprises a first component and a second component, the first component is a nickel modified ZSM-5 molecular sieve; and the second component is amorphous silica-alumina loaded with an active metal component. The preparation method of the cracking catalyst comprises the following steps: (1) treating a ZSM-5 molecular sieve to obtain a first ZSM-5 molecular sieve; (2) treating the first ZSM-5 molecular sieve with an ammonium salt solution to obtain a second ZSM-5 molecular sieve; (3) treating the second ZSM-5 molecular sieve and a nickel-containing compound solution to obtain a first material; (4) treating the amorphous silicon-aluminum and the active metal precursor solution to obtain a second material; and (5) mixing the first material, the second material and water, drying and roasting to obtain the cracking catalyst. The invention also provides a plastic and heavy oil co-conversion process. After the cracking catalyst is used, the yield of a liquid product can be obviously improved, carbon deposition of the catalyst is reduced, and the service life of the catalyst is prolonged.

This invention relates to the field of asymmetric catalytic hydrogenation, specifically to a method for preparing chiral chromone or chromane carboxylic acid compounds. The method involves preparing a chiral catalyst from a nickel compound and ligands. By controlling the combination of the nickel compound-ligand-solvent, enantioselective hydrogenation of the conjugated C=C bonds of the substrate chromone carboxylic acid compound is achieved, yielding the semi-reduced product chiral chromone carboxylic acid; or, further, the carbonyl group is reduced, and carbonyl reduction and dehydroxylation reactions are carried out at room temperature under trifluoroacetic acid and triethylsilane conditions to obtain the fully reduced product chiral chromane carboxylic acid. The catalytic system of this invention is simple to construct, and the selectivity can be controlled by the solvent system. It maintains high conversion and excellent enantioselectivity even under high S / C conditions, making it suitable for the efficient preparation of chiral chromone / chromane skeletal carboxylic acid compounds.

Disclosed is a method for producing a polymer, the method comprising polymerizing a conjugated diene monomer in the presence of a lanthanide-based catalyst system, the lanthanide-based catalyst system comprising: (i) a lanthanide-containing compound, (ii) triethylaluminum, (iii) aluminum hydride, and (iv) a halogen-containing compound; or a method for producing a polymer, the method comprising polymerizing a conjugated diene monomer in the presence of a lanthanide-based catalyst system, the lanthanide-based catalyst system comprising: (i) a nickel-containing compound, (ii) triethylaluminum, (iii) aluminum hydride, and (iv) a halogen-containing compound selected from a fluorine-containing compound and a chlorine-containing compound.

This invention discloses a method for preparing petroleum coke, comprising the following steps: pre-sulfurizing a catalyst, followed by hydrodesulfurization treatment with aromatic-enriched oil slurry; then polycondensation treatment, collecting the primary fraction; then secondary fractionation of the primary fraction, collecting the secondary fraction; and finally, delayed coking of the secondary fraction to obtain petroleum coke. In the catalyst preparation process, a porous γ-Al₂O₃ support coated with a chitosan layer is impregnated in a mixed aqueous solution of nickel and molybdenum compounds, followed by calcination to obtain the catalyst. This invention selects a suitable catalyst for hydrodesulfurization and combines it with appropriate process conditions to obtain a fraction with good flowability and containing a suitable amount of cycloalkane structure, achieving simultaneous adjustment of the reaction rate and flowability during delayed coking, ultimately obtaining petroleum coke. The petroleum coke obtained by this invention, after graphitization treatment, exhibits high graphitization degree and high capacity.

The application discloses a method for recycling lithium, nickel, cobalt and manganese in waste ternary lithium batteries by step leaching, and comprises the following steps: 1) pretreatment: calcining positive and negative electrode powders of the waste ternary lithium batteries for standby; 2) leaching and separating lithium: mixing the calcined powder in the step 1) with a lithium leaching agent to leach lithium, and after the leaching is completed, performing first solid-liquid separation to obtain a lithium carbonate solution; 3) leaching and separating nickel: mixing the solid obtained by the first solid-liquid separation with a nickel leaching agent to leach nickel, and after the leaching is completed, performing second solid-liquid separation to obtain a nickel compound solution; 4) leaching and separating manganese: mixing the solid obtained by the second solid-liquid separation with a manganese leaching agent to leach manganese, and after the leaching is completed, performing third solid-liquid separation to obtain a manganese compound solution, and the solid obtained by the third solid-liquid separation is a mixture of a cobalt compound and carbon. The application can deeply separate the nickel, cobalt, manganese and lithium, has high recovery rate, can realize continuous production and is suitable for industrial production.

Provided is a nickel recovery method for efficiently recovering nickel from a nickel solution containing 2,2'- bipyridine and a nickel compound generated in an organic chemical reaction process.　The nickel recovery method according to the present invention comprises: (a) a step for preparing a nickel solution containing 2,2'- bipyridine and a nickel compound generated in an organic chemical reaction process; (b) a step for adding an alkali metal perchlorate to the nickel solution to form a tris (2,2'- bipyridine) perchlorate nickel salt serving as an ion pair; and (c) a step for recovering the tris (2,2'- bipyridine) perchlorate nickel salt.

The application discloses a preparation method of high-dispersion superfine spherical nickel powder, which comprises the following steps: preparing a nickel salt aqueous solution by mixing a nickel salt, a complexing agent and a dispersing agent, converting a precipitant aqueous solution into a precipitant micro-nano aerosol, adding the precipitant micro-nano aerosol into the nickel salt aqueous solution, performing a gas-liquid phase limited micro-region pre-reaction, obtaining a suspension containing a nickel compound, then performing a homogeneous hydrothermal reaction and vacuum calcination, and obtaining the high-dispersion superfine spherical nickel powder. The application uses low-cost and low-pollution soluble nickel salt as a nickel source, establishes a limited micro-region reaction of aerosol, realizes controllable preparation of high-purity, high-sphericity, high-dispersity and uniform-morphology spherical nickel particles, effectively obtains the high-dispersion superfine spherical nickel powder under the conditions of low cost and low energy consumption, meets the requirements of high-dispersion superfine spherical nickel powder for various scale internal electrode slurries of MLCC, and has good fluidity, which is helpful to preparation of high-performance MLCC internal electrode slurry.

The application discloses high-purity sulfur-containing active nickel particles and a preparation method thereof. A nickel sulfur / nickel compound is added into a nickel melt, and refining is carried out under electromagnetic stirring to obtain a nickel sulfur melt. Then, the nickel sulfur melt is cast in a mold to obtain a high-purity nickel sulfur ingot. The ingot is subjected to hot isostatic pressing to obtain a compacted blank. The blank is cut according to the size of a finished product to obtain the high-purity sulfur-containing active nickel particles. The nickel sulfur / nickel compound is selected from one of a nickel block wrapped with a nickel sulfur compound, a nickel foil wrapped with a nickel sulfur compound and a nickel sintered body containing a nickel sulfur compound. The application adds sulfur into nickel by a specific method through vacuum induction smelting, and realizes preparation of a nickel sulfur ingot with high-purity composition, stable sulfur content and no segregation by combining with electromagnetic stirring in the whole process. Subsequently, a targeted processing technology is adopted according to the large brittleness of the nickel sulfur to complete batch production of the high-purity sulfur-containing active nickel particles. The preparation method is low in comprehensive cost, small in environmental pollution and suitable for industrialized production.

This invention discloses a method for preparing a nickel single-atom catalyst based on lignin-based activated carbon and its application in electrocatalytic CO2 reduction. The method uses lignin-based activated carbon as the carbon support, melamine as the nitrogen source, and a nickel-containing compound as the metal source. A process of doping followed by loading is employed to prepare the lignin-based activated carbon nickel single-atom catalyst. Application to electrocatalytic CO2 reduction revealed that, in H-type electrolytic cell tests, the catalyst exhibited high CO selectivity and CO bias current density across a wide potential range of -0.7 to -1.0 V vs RHE, demonstrating excellent catalytic activity. Compared to traditional catalysts, the carbon support used in this method is a renewable solid waste resource, resulting in low raw material costs and a simple and easy-to-operate preparation process. This method not only provides guidance for the application of lignin-based activated carbon in the field of electrocatalysis but also reduces the preparation cost of CO2 reduction electrocatalysts.

The invention discloses ammonium fluoride etched micron zero-valent iron-nickel particles based on mechanical ball milling as well as a preparation method and application of the ammonium fluoride etched micron zero-valent iron-nickel particles. The micron zero-valent iron-nickel particles are mainly prepared by mixing micron zero-valent iron, ammonium fluoride and a transition metal nickel compound through a mechanical ball-milling etching-loading process, the transition metal nickel compound is mainly composed of nickel chloride hexahydrate, and the mass ratio of the micron zero-valent iron to the ammonium fluoride to the nickel chloride hexahydrate is 1: (0.01-0.04): (0.02-0.08). Ammonium fluoride is added for modifying and improving the dehalogenation performance of the iron-nickel particles. The reductive dehalogenation reaction activity of the particles on halogenated organic matters is remarkably improved, and the particles still keep stable performance after being recycled for more than 20 times and are not obviously attenuated; meanwhile, halogen functional groups in aliphatic halides and aryl halides can be efficiently reduced and removed, and excellent water treatment application potential is shown.

The invention discloses a preparation method of a nickel-loaded nitrogen-doped lignin derived carbon-based catalyst for CO2 electroreduction. According to the method, lignin is adopted as a carbon source, melamine is adopted as a nitrogen source, a nickel-containing compound is adopted as a metal source, and the nickel-loaded and nitrogen-doped carbon-based catalyst is prepared through a simple loading and doping technological process. When the catalyst is applied to electrocatalytic CO2 reduction, it is found that the catalyst shows excellent catalytic activity on CO2 reduction, the existence form of metal Ni in the catalyst is changed by adjusting the Ni loading amount, and then the selectivity of CO in a CO2 electrocatalytic reduction product is changed. Compared with a traditional CO2 electrocatalyst, the lignin carbon source adopted in the method is a renewable solid waste resource, and the raw material cost is low; the technological process is simple and easy to operate; meanwhile, distribution of reduction products can be regulated and controlled by regulating and controlling preparation process parameters, and more application prospects are provided for electrocatalytic CO2 reduction.

The application belongs to the field of catalytic oxidation removal of CO, and provides a Ni-MnOx doped oxide catalyst. The Ni-MnOx doped oxide catalyst is prepared by aerosol high-temperature decomposition of a nickel-containing compound and a manganese-containing compound. The application adopts base metal doping, high-temperature reaction, nano engineering and interface reaction to realize low-temperature gasification of carbonates on the surface of the catalyst, release active sites, achieve 100% conversion of CO into CO2 at 25-800 DEG C, and 82% conversion of CO into CO2 at -20 DEG C.

The invention discloses a nickel-based composite electrode and a preparation method thereof, and belongs to the technical field of solid oxide batteries. The preparation method comprises the following steps: molding a mixture containing a nickel compound and an electrolyte to obtain a nickel-based composite electrode precursor; and pre-sintering the nickel-based composite electrode precursor, then carrying out high-temperature flash sintering at 1500-3000 DEG C, and then carrying out annealing to obtain the nickel-based composite electrode. According to the invention, nickel enrichment at the grain boundary in the electrode can be inhibited, and the conductivity of the electrode can be improved.

The invention provides low-apparent-density basic nickel carbonate and a preparation method thereof, and belongs to the technical field of nickel compound preparation. According to the invention, nickel sulfate is taken as a nickel source, ammonium bicarbonate is taken as a carbonate / alkalinity source, co-dropwise adding is carried out under mild conditions, and segmented stirring is adopted, so that uniform nucleation, low-shear loose agglomeration and reaction complementation are realized, and densification and entrainment are reduced; aging to form a stable phase, and carrying out solid-liquid separation to obtain a filter cake; a warm ammonium bicarbonate dilute solution is used for replacing and washing out channel entrained salt, and then warm deionized water is used for washing to reduce residual soluble salt; introducing an ammonium bicarbonate pore-forming agent, controlling the water content of a filter cake, realizing pore-forming and pore-preserving by matching with sectional drying, and finally, lightly crushing and screening to obtain a product; according to the method, the dissolution, dispersion and reaction suitability of the nickel source in the preparation process of the lithium ion battery positive electrode material precursor is further improved through the cooperation of source sodium removal, shape control and pore protection and replacement desalination.

The invention belongs to the technical field of hydrogen evolution electrodes, and provides a hydrogen evolution cathode and a preparation method and application thereof. The preparation method comprises the following steps: repeatedly and sequentially coating a catalyst solution system and sintering on a nickel substrate to obtain a precursor; and placing the precursor in an inorganic alkali solution for electric activation to obtain the hydrogen evolution cathode, the catalyst solution system comprises a catalytic metal compound, hydrochloric acid and a solvent; the catalytic metal compound comprises one or more of a nickel compound, a cerium compound, a ruthenium compound, a molybdenum compound, a platinum compound and an iron compound; the sintering temperature independently ranges from 400 DEG C to 600 DEG C, the sintering time independently ranges from 10 min to 60 min, and the sintering atmosphere is air. According to the invention, the hydrogen evolution cathode with a composite nano structure is obtained on a nickel substrate through coating, sintering and electric activation. According to the prepared hydrogen evolution cathode, the binding force between the catalyst layer and the nickel substrate is high, and the service life is prolonged.

Provided in the present invention is a method for preparing a 2-alkoxy-2-methyl tetrahydrofuran compound from 2-methyl furan. In the present invention, a metal hydroxide and zero-valent nickel compounded catalyst is prepared, and a 2-alkoxy-2-methyltetrahydrofuran is generated by directly hydrogenating 2-methylfuran under the conditions of an alcohol solvent and hydrogen. By means of the method of the present invention, the use of a homogeneous acid catalyst is avoided, such that the product separation is more convenient, and the catalyst can be recycled, thereby also reducing the burden on the environment, providing a new technical solution for achieving efficient and green synthesis of a 2-alkoxy-2-methyltetrahydrofuran, and broadening the production of biomass-based fuels, chemicals and green solvents.

The invention relates to a method for forming an electrical contact (16). The method comprises grinding a silicon carbide surface (101) with a grinding disk having a grinding surface containing nickel or a nickel compound, such that particles (12) of nickel or a nickel compound from the grinding surface are deposited (210) in the ground silicon carbide surface; and tempering the ground silicon carbide surface (101g) by means of a laser, such that at least a portion of the deposited nickel particles (12) form (220) nickel silicide with the silicon of the silicon carbide.