1197 results about "Cobalt salt" patented technology

The invention discloses preparation and application of a diatomic catalyst modified carbon felt electrode. The preparation method of the modified carbon felt electrode comprises the following steps: dissolving bismuth salt, cobalt salt and urea in water to obtain a complexing solution; immersing the carbon felt substrate subjected to acid activation into a complexing solution for soaking treatment, then taking out the carbon felt substrate, and drying to obtain a precursor-loaded carbon felt; and sequentially carrying out primary heating, cold shock and secondary heating treatment on the precursor-loaded carbon felt, and cooling to obtain the Bi-Co diatom modified carbon felt electrode. The carbon felt electrode can be applied to an all-vanadium redox flow battery. The innovation point of the invention lies in that through the synergistic effect of double atoms and the mutual cooperation of the nitrogen-doped carbon substrate, the intrinsic activity bottleneck of the traditional catalyst is broken through, the comprehensive advantages of high catalytic activity, excellent stability and low cost are achieved, and a new technical solution is provided for the high performance and large-scale application of the flow battery.

The invention relates to a preparation method of Pt monatomic nano-enzyme and application of Pt monatomic nano-enzyme in cardiac troponin I. The preparation method comprises the following steps: 1) ultrasonically dispersing cobalt salt, selenium powder, chloroplatinic acid, urea and sodium chloride in an alcohol solvent, heating and stirring until the solvent is completely volatilized to obtain a solid mixture, and grinding the solid mixture into powder; and 2) placing the powder in a heating device, carrying out Joule heat treatment in an air atmosphere, washing a reactant, and carrying out vacuum drying to obtain the Pt monatomic nano-enzyme. Se doping is introduced in the one-step chemical reaction process to construct oxygen vacancies, rapid heating and structural shaping are achieved in combination with Joule heat treatment, the Se-doped Co3O4-loaded Pt monatomic catalyst is obtained, the oxygen vacancies and Se doping sites are synergistically used as anchoring sites, Pt monatomic atoms are effectively fixed, and the loading capacity and dispersity of the Pt monatomic atoms are improved. The obtained material shows excellent POD-like enzyme activity, can be used for constructing a high-sensitivity colorimetric immunoassay system, and realizes rapid and accurate detection of cTnI.

The invention belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

The invention belongs to the technical field of water treatment materials, and particularly relates to a spin state gradient regulation cobalt monatomic catalyst and a preparation method and application thereof.The preparation method comprises the steps that cobalt salt is loaded on a metal organic framework material ZIF-8, heating pyrolysis is conducted in an inert atmosphere, and a Co-N4 precursor is formed; after sulfur-containing gas is introduced, secondary heating pyrolysis is carried out, so that nitrogen coordination is gradually replaced by sulfur atoms; and sequentially carrying out acid washing and alkali washing on the pyrolysis product to obtain the spin-state gradient-regulated cobalt monatomic catalyst Co-SxN (4-x), and x is equal to 1-3. The Co and ZIF-8 compound is used as a Co monatomic dispersion template, so that Co atoms are uniformly dispersed in pore channels and nodes of ZIF-8, and metal agglomeration in the high-temperature carbonization process is avoided. And the sulfur doping gradient is utilized to regulate and control the spin state of cobalt monatomic, so that the synergistic improvement of catalytic activity and stability is realized, and the purpose of efficiently degrading and removing organic pollutants in water is achieved.

The invention relates to the technical field of methane cracking and hydrogen production, and discloses a metal-modified Co-Bi liquid alloy catalyst, wherein the catalyst uses Co as an active component, uses Bi low melting point metal as a solvent, and uses a third metal M as an auxiliary agent; the invention also discloses a method for preparing the catalyst, comprising: calcining a cobalt salt to generate cobalt oxide, and then forming CoO-MO X The mixture powder was finally heated under N2 and H2 atmosphere to obtain CoO‑MO X The powder is mixed with elemental Bi to obtain a cobalt-bismuth ternary liquid alloy catalyst; the present invention also discloses a method for applying the catalyst to methane cracking and hydrogen production, comprising: heating the preheating furnace to a certain temperature, introducing pure methane gas, and reacting under normal pressure, at a temperature of 500 to 700°C, with a methane space velocity of 1 to 100 mL / g·min, and after the reaction is completed, the temperature drops to room temperature in an N2 atmosphere, and the carbon product is taken out of the reaction tube after cooling. The catalyst disclosed by the present invention has the advantages of high activity, good stability, strong methane cracking ability, mild reaction conditions, simple preparation process, and long life.

The invention relates to the technical field of electro-catalysis and hydrogen energy, in particular to a modified LDH-based catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing trimesic acid, water, an organic solvent, a nickel salt, a cobalt salt and an iron salt, carrying out electro-deposition, washing and drying to obtain a NiFeCo-LDH (TA) catalyst; the preparation method comprises the following steps: soaking a NiFeCo-LDH (TA) catalyst in a silver salt solution, washing and drying to obtain the modified LDH-based catalyst. The modified LDH-based catalyst provided by the invention can effectively resist chloride ion corrosion and inhibit dissolution of active metals in layered double hydroxides (LDH) under high current density in seawater, can reach industrial grade current density under relatively low overpotential, and can stably run for more than 1000 hours.

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

The invention discloses a high-entropy metal oxide catalyst as well as a preparation method and application thereof in CO catalytic oxidation, and belongs to the technical field of flue gas treatment. The preparation method comprises the following steps: dissolving copper salt, manganese salt, cerium salt, cobalt salt, vanadium salt and a dispersing agent into water to form a uniform solution, and slowly adding excessive alkali precipitant into the uniform solution to form a solid-liquid mixture; the solid-liquid mixture is transferred into a high-pressure kettle to be subjected to a hydrothermal reaction and then quenched, an obtained hydrothermal reaction product is calcined, and the high-entropy metal oxide catalyst is obtained and is high in catalytic oxidation activity on carbon monoxide at the low temperature, excellent in water resistance and sulfur resistance and particularly suitable for treatment of complex flue gas.

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention discloses a nano-alloy catalyst for anion exchange membrane electrolyzed water and a preparation method of a membrane electrode of the nano-alloy catalyst, when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is not added, NiFe binary alloy powder is obtained, the content of Ni is 90%-100%, and the content of Fe is 0%-10%; when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is added, NiFe ternary alloy powder is obtained, the content of Ni is 76%-96%, the content of Fe is 4%, and the content of the third element is 0%-20%. The nano-alloy catalyst material for anion exchange membrane water electrolysis prepared according to the invention is good in corrosion resistance and high in stability, the total water splitting efficiency is further improved, the synthesis method is simple, the used metal salt is low in cost, the metal salt can be uniformly loaded on a substrate carrier through spraying, and industrial application of total water splitting under high current density is easy to realize.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

The invention discloses a catalytic electrode which comprises a substrate, and an anti-corrosion layer and a sulfur-phobic layer which are sequentially attached to the substrate, the substrate is a blank foamed nickel substrate, the anti-corrosion layer is formed by dipping the foamed nickel substrate with a ferric salt solution, and the sulfur-phobic layer is formed by processing a precursor with a cobalt salt solution through electro-deposition. Accordingly, a corresponding preparation method is also established, a blank foamed nickel substrate is adopted, firstly, the foamed nickel substrate is subjected to dipping treatment with an iron salt solution to obtain a precursor with an anti-corrosion layer, and then the precursor is subjected to electro-deposition treatment with a cobalt salt solution to form the sulfur-phobic layer on the anti-corrosion layer. Wherein the anti-corrosion layer can isolate a high-sulfur environment and prevent the substrate from being corroded; the sulfur phobic layer may prevent sulfur products from depositing and passivating the electrode. The catalytic electrode provided by the invention solves the problems of sulfur reaction corrosion and passivation, shows excellent catalytic activity and stability, and can be used for catalyzing sulfur oxidation reaction for a long time. In conclusion, the method has the advantages of mild conditions, simple process, economy and practicability, and has obvious large-scale industrial production potential.

The invention provides a novel metal organic framework material reinforced carbon dioxide trapping solvent and a preparation method thereof, and relates to the field of gas adsorbents. Comprising the following steps: S1, dissolving nickel salt, cobalt salt and zinc salt in water to obtain a metal salt solution; s2, uniformly mixing 2, 5-dihydroxyterephthalic acid and N, N-dimethylformamide, then adding 1-methylimidazole and ethanol, and uniformly mixing to obtain a ligand solution; s3, mixing the metal salt solution with the ligand solution, adding the mixture into a microwave reactor for reaction, filtering and drying to obtain an organic framework material; and S4, dispersing the organic framework material in deionized water, then adding an organic amine aqueous solution and a silane coupling agent, uniformly stirring, then adding an imidazolium ionic liquid, and carrying out ultrasonic oscillation to obtain the composite material. The carbon dioxide trapping solvent takes a metal organic framework material as a carrier, and the metal organic framework material is functionally modified and is matched with imidazole ionic liquid, so that the adsorption efficiency and the stability of the trapping solvent can be improved.

The invention relates to a flow battery carbon-based electrode and a preparation method and application thereof, and the preparation method comprises the following steps: respectively dissolving cobalt salt and alkali in a polar organic solvent, and uniformly mixing to form a precursor solution; placing a carbon-based material in the precursor solution, and carrying out a hydrothermal reaction to obtain a carbon-based electrode precursor; and performing high-temperature carbonization on the carbon-based electrode precursor in an inert atmosphere, cooling to room temperature after the reaction is completed, and then cleaning and removing impurities from a product to obtain the carbon-based electrode, the polar organic solvent is at least one of formamide, acetonitrile and N, N-dimethylformamide; after cobalt cyanide is deposited on the surface of the carbon-based material, surface etching and nitrogen doping are carried out on the carbon-based material under the high-temperature condition, surface modification of the carbon-based material is achieved, the contact area of the surface of the carbon-based electrode and electrolyte is increased, and the electrochemical performance of the carbon-based electrode is improved.

The invention relates to the technical field of electrocatalysts, and discloses a heterojunction catalyst composed of cobalt-copper co-doped ruthenium dioxide and metal ruthenium as well as a preparation method and application of the heterojunction catalyst. The preparation method comprises the following steps: carrying out hydrothermal reaction on cobalt salt and trimesic acid in a mixed solvent to prepare a cobalt metal organic framework precursor; a cobalt-copper bimetal organic framework is obtained through ion exchange of a copper salt solution; preparing a ruthenium-cobalt-copper ternary metal organic framework by adopting secondary ion exchange of a ruthenium salt solution; and carrying out air calcination treatment to obtain the cobalt-copper co-doped ruthenium dioxide and metal ruthenium heterojunction catalyst. According to the method, cobalt and copper atoms are uniformly doped in ruthenium dioxide crystal lattices through a step-by-step ion exchange strategy, and metal ruthenium nano-particles are grown on the surface in situ to form a heterogeneous interface. The obtained catalyst shows excellent performance in an acidic electrolyzed water anode oxygen evolution reaction, the overpotential is only 199 mV under the current density of 10 mA. Cm, and the stability can be maintained for 40 hours.

The invention belongs to the technical field of new energy and electrochemistry, and particularly relates to a corrosion-resistant structured transition metal alloy electrode suitable for hydrogen production from alkaline water and a preparation method of the corrosion-resistant structured transition metal alloy electrode. The method comprises the following steps: sequentially carrying out sand blasting treatment and electrochemical activation treatment on a nickel net substrate so as to improve the surface roughness and the number of active sites; and then performing constant-current deposition in an electro-deposition solution containing nickel salt and ferric salt and / or cobalt salt, and constructing a nickel-based alloy catalyst layer in a micron array shape to obtain the alloy electrode. Through observation of a scanning electron microscope, the surface of the obtained electrode has a sphere-like microstructure, the arrangement is compact, and the catalytic efficiency and durability can be improved. The prepared structured alloy electrode has the advantages of being high in interface bonding force, high in electro-catalytic performance, high in alkali corrosion resistance and the like, and is suitable for efficient and long-term operation of hydrogen production through alkaline electrolysis of water.

One or more embodiments of the invention relate to the field of industrial solid waste recycling, in particular to a method for preparing tungstic acid from a hard alloy waste tungsten grinding material, and the method comprises the following steps: S1, carrying out roasting pretreatment on the waste tungsten grinding material to obtain a roasted material; s2, mixing the roasted material obtained in S1 with an acidic solution, and stirring to obtain a solid-liquid mixture; s3, putting the solid-liquid mixture obtained in S2 into a high-pressure kettle; s3-1, oxidizing gas is introduced into the high-pressure kettle, and a stirring leaching reaction is carried out; s3-2, after the reaction is completed, carrying out liquid-solid separation; and S3-3, after liquid-solid separation, washing the leaching residues with hot water for 3-5 times to obtain the leaching residues which are tungstic acid solid phases and a leaching solution which is a cobalt salt solution. The problems that in the prior art, various hard alloy waste tungsten grinding material regeneration treatment technologies are tedious in technological process, large in tungsten loss, high in treatment cost and the like are solved.

The invention discloses cobalt molybdenum nitride / cobalt modified nitrogen-doped hollow carbon microspheres as well as preparation and application thereof, and relates to the technical field of electrochemical energy storage devices. Carboxylated polystyrene microspheres, soluble zinc salt and cobalt salt, phosphomolybdic acid and 2-methylimidazole are dispersed in methanol, a PMA (at) ZnCo-ZIFs / PS precursor of a spherical structure is obtained, then the PMA (at) ZnCo-ZIFs / PS precursor is placed in an inert atmosphere for carbonization treatment, and the cobalt molybdenum nitride / cobalt modified nitrogen-doped hollow carbon microsphere material is obtained. According to the structure and the preparation method, the nitride / metal cobalt component and the nitrogen-doped sodium affinity sites are introduced at the same time, uniform transportation and nucleation of sodium ions are effectively induced, sodium metal is guided to deposit in a specific three-dimensional structure, growth of sodium dendrites is effectively inhibited, volume expansion of metal sodium in the reaction process is relieved, the preparation method is simple and convenient, and the preparation method is suitable for industrial production. The cost is low, the electrochemical performance of the sodium metal battery assembled by using the composite material can be remarkably improved, and the composite material has a good large-scale application prospect.

The invention discloses an efficient NiMo-Co MOF alkaline electrolysis water electrode and a preparation method thereof.The efficient NiMo-Co MOF alkaline electrolysis water electrode comprises a nickel net, a NiMo deposition layer deposited on the nickel net and a Co MOF deposition layer deposited on the NiMo deposition layer, and during preparation, the nickel net is pretreated firstly; dissolving a nickel salt, a molybdenum salt, a conductive salt and a complexing agent in water to obtain a NiMo electro-deposition solution; the method comprises the following steps: dissolving cobalt salt and a ligand in a mixed solution of DMF and water to obtain a Co MOF electro-deposition solution; the pretreated nickel net is placed in a NiMo electro-deposition solution for constant-current deposition, and a NiMo electrode with a NiMo deposition layer loaded on the nickel net is obtained; the NiMo electrode is placed in the Co MOF electro-deposition solution for constant-voltage deposition, and the NiMo-Co MOF composite electrode with the Co MOF deposition layer loaded on the NiMo electrode is obtained. The method is simple and easy to control, low in preparation cost and good in electrode stability and hydrogen production effect.

The invention discloses a rare earth metal doped transition metal electrocatalyst and a preparation method and application thereof, the chemical formula of the catalyst is Eu-CoS1.097, the catalyst is of a crystalline and amorphous structure, and the Eu element exists in a monatomic form; the preparation method comprises the following steps: (1) dissolving polyvinylpyrrolidone and NH2-H2BDC in a solvent to obtain a mixed solution; (2) adding cobalt salt and europium salt into the mixed solution, uniformly mixing, and carrying out hydrothermal reaction to obtain an EuCo-MOF precursor; and (3) adding the EuCo-MOF precursor and thioacetamide into a solvent, and carrying out hydrothermal reaction, so that TAA releases S < 2->, and etching to obtain the rare earth metal doped transition metal electrocatalyst with a hollow spherical structure. According to the catalyst disclosed by the invention, atomic-scale Eu is doped in cobalt sulfide, so that the activity of the transition metal catalyst is effectively improved; the preparation method is simple and efficient.

The invention provides an alkaline hydrogen production electrode, a preparation method thereof and a water electrolysis hydrogen production device, and relates to the field of water electrolysis hydrogen production. The preparation method of the alkaline hydrogen production electrode comprises the following steps: forming the hydrogen evolution active layer on the substrate by electroplating; the substrate with the hydrogen evolution active layer is etched, so that a micro-channel structure is formed on the surface of the hydrogen evolution active layer, and the alkaline hydrogen production electrode is obtained; wherein electroplating liquid used for electroplating comprises a main active component and a secondary active component, the main active component comprises nickel salt, and the secondary active component comprises at least one of ferric salt, cobalt salt, copper salt, manganese salt and molybdenum salt. According to the invention, the generation of a large number of active sites and the formation of abundant micro-channel structures can be simultaneously realized on the surface of the electrode through etching, the catalytic activity of the electrode is improved, and the influence of concentration polarization is weakened. Moreover, the transition region between the substrate and the hydrogen evolution active layer is not affected in the etching process, and the transition region between the substrate and the hydrogen evolution active layer has high binding force strength, so that the electrode can stably operate for a long time.

The present invention discloses a cobalt-based armor nanozyme and its preparation method and application. The method comprises uniformly mixing a cobalt salt solution, a 2,2'-bipyridine solution, and a g-C3N4 dispersion, performing sufficient reaction followed by pretreatment to obtain a precursor, and grinding and calcining the precursor to obtain the cobalt-based armor nanozyme. The cobalt-based armor nanozyme prepared by the present invention has high catalytic activity and the stability of carbonaceous materials. While ensuring efficient catalysis, it greatly reduces secondary pollution caused by cobalt metal leaching. The cobalt-based armor nanozyme can be used to remove organic pollutants from solid pollutants such as soil and water, and can also be used for targeted enrichment of numerous organic pollutants in contaminated wastewater, thereby improving removal efficiency.

The invention provides a CuCoNi-MOF aerogel nano-enzyme, a preparation method thereof and a detection reagent, and belongs to the technical field of antibody detection.The preparation method of the aerogel nano-enzyme comprises the following steps that bivalent copper salt, bivalent cobalt salt and bivalent nickel salt are mixed, then a reducing agent is added to reduce bivalent metal ions, then a dimethylimidazole solution is added, and the CuCoNi-MOF aerogel nano-enzyme is obtained. And reacting at 25-35 DEG C for at least 1 hour, finally taking out the precipitate after the reaction, washing with deionized water, and freeze-drying to obtain the target product. The detection reagent provided by the invention is prepared from the aerogel nano-enzyme as a raw material. The aerogel nano enzyme has high activity and strong stability, and can form a detection reagent with stable properties with a protein biomarker, and meanwhile, the preparation method is simple and convenient, and does not need expensive instruments, so that the manufacturing cost can be reduced. The detection reagent provided by the invention has very high sensitivity and accuracy.

The invention relates to composite-form aluminum-doped cobalt carbonate as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a first carbonate solution, a second carbonate solution and an aluminum-doped cobalt salt solution; under the stirring condition, the aluminum-doped cobalt salt solution and the first carbonate solution are added into the second carbonate solution for a pre-reaction, and a reaction solution containing cobalt carbonate seed crystals is obtained; an aluminum-doped cobalt salt solution and a first carbonate solution are continuously added into the reaction solution, a first reaction and a second reaction are sequentially carried out, composite-form aluminum-doped cobalt carbonate particles are obtained, the second reaction comprises a first stage and a second stage, the mass ratio of the aluminum-doped cobalt salt solution to the first carbonate solution in the first stage is 1: 1-2: 1, and the mass ratio of the aluminum-doped cobalt salt solution to the second carbonate solution in the second stage is 1: 1-2: 1; and in the second stage, the mass ratio of the aluminum-doped cobalt salt solution to the first carbonate solution is (0.10: 1)-(0.25: 1). According to the preparation method disclosed by the invention, uniform dispersion of an outer-layer aluminum sheet is realized, and the uniformity of aluminum doping in cobalt carbonate is improved.

The invention belongs to the field of catalysts, and particularly relates to a supported metal catalyst for thermal oxidative degradation of polyester plastics as well as a preparation method and application of the supported metal catalyst. The supported metal catalyst provided by the invention is prepared by the following steps: a) dipping a silicon-aluminum molecular sieve in a metal salt aqueous solution under a stirring condition; after the impregnation is finished, centrifuging and collecting a solid-phase product to obtain a catalyst precursor; in the step a), the silicon-aluminum molecular sieve is one or more of a ZSM molecular sieve, a USY molecular sieve, an LSP molecular sieve and a TS-1 molecular sieve; the metal salt is one or more of nickel salt, copper salt, cobalt salt and iron salt; the dipping temperature is 20-100 DEG C; and b) calcining the catalyst precursor under an aerobic condition to obtain the supported metal catalyst. The supported metal catalyst provided by the invention is simple in preparation process and low in cost, and has relatively high activity, selectivity and stability in solvent-free thermal oxidation degradation reaction of polyester plastics.

The invention relates to a coprecipitation method for preparing cobaltosic oxide, which comprises the following steps: mixing a cobalt salt solution, a precipitant solution and a complexing agent solution in a carbonate base solution in a parallel flow manner, and carrying out first coprecipitation reaction to a first particle size to obtain a seed crystal; the cobalt salt solution, the precipitant solution and the complexing agent solution are mixed in a parallel flow mode, a second coprecipitation reaction is conducted, and cobalt carbonate powder is obtained; calcining the cobalt carbonate powder to obtain cobaltosic oxide with a median particle size D50 of 18-20 [mu] m; a complexing agent in the complexing agent solution is iminodiacetic acid. According to the invention, by using the specific complexing agent, cobalt ions exist in the system in the form of complex ions and are slowly released in the reaction process, so that the first coprecipitation reaction can be carried out orderly, and the cobaltosic oxide with the median particle size D50 of 18-20 [mu] m can be obtained.

The invention belongs to the technical field of catalysts and relates to a cobalt-based porous aluminum catalyst for catalytic decomposition of N2O in nitric acid production tail gas as well as a preparation method and application of the cobalt-based porous aluminum catalyst. The catalyst takes Al2O3 as a carrier, Co3O4 as an active component and KF and K2O as auxiliaries, and the preparation method comprises the following steps: firstly, uniformly dispersing a certain amount of cobalt salt, villiaumite and pseudo-boehmite in deionized water to form a turbid liquid, regulating the pH value of the turbid liquid to a certain range by taking potassium salt as a precipitant to obtain a corresponding precipitate mixture, and then carrying out suction filtration and washing on the precipitate. And drying, roasting and forming the obtained filter cake to obtain the catalyst. The preparation method is simple, and industrial amplification is easy to realize. The prepared catalyst can realize direct catalytic decomposition of N2O at a low temperature, has excellent O2 resistance, NO2 resistance and water vapor resistance, has high crushing strength, and can be well applied to emission reduction of N2O in nitric acid production tail gas.

The invention relates to the technical field of multifunctional composite materials, in particular to wave-absorbing, photo-thermal and deicing integrated carbon aerogel and a preparation method thereof. The wave-absorbing, photo-thermal and deicing integrated carbon aerogel is characterized by comprising the following raw materials: 5-15 parts of a dominant bio-based material; 3-10 parts of an auxiliary bio-based material; 0.5 to 3 parts of cobalt salt; 1-5 parts of a photo-thermal material, namely an MXene material; a dispersion medium: 40-80 ml of a 1% v / v acetic acid solution; the concentration of the photo-thermal material dispersion liquid is 0.5 mg / mL to 2 mg / mL, and the concentration of the photo-thermal Compared with the prior art, the wave-absorbing, photo-thermal and deicing integrated carbon aerogel and the preparation method thereof have the advantages that through the collaborative design of a bio-based framework and MXene, the problems of function splitting, non-uniform photo-thermal material loading and insufficient wave-absorbing strength of an existing material are solved, collaborative fusion of photo-thermal deicing and wave-absorbing functions is realized, and the wave-absorbing performance of the wave-absorbing, photo-thermal and deicing integrated carbon aerogel is improved. The method is suitable for extreme environment protection scenes such as aerospace and wind power equipment.