18 results about "COBALTOUS NITRATE" patented technology

This invention discloses a method for preparing sheet-like nano-sized cobalt hydroxide. The method includes the following steps: using cobalt nitrate as the cobalt source and sodium hydroxide solution as the precipitant, a co-precipitation reaction is carried out. The cobalt nitrate solution and sodium hydroxide solution are added together to a reaction vessel. By controlling the synthesis pH and temperature, the synthesized cobalt hydroxide slurry is washed with hot pure water, dried, and crushed using an air jet mill to obtain sheet-like nano-sized pink cobalt hydroxide with low sodium content. Specifically, the key to preparing sheet-like nano-sized cobalt hydroxide is to prevent oxidation and particle agglomeration during the synthesis process. This invention uses a low-temperature (40-60℃), low-pH (8.0-9.0) cobalt hydroxide synthesis process with a small amount of antioxidant added to prepare sheet-like micron-sized cobalt hydroxide that is not easily oxidized or agglomerated. In addition, at the low pH, the sodium content is low, making the subsequent filtration and washing steps easier to operate.

The application relates to a magnetic cobalt-aluminum layered double hydroxide composite catalyst, a preparation method thereof and application of the catalyst in degradation of pesticides, and belongs to the field of environmental catalytic materials and water treatment technologies. The catalyst is composed of Fe3O4 superparamagnetic nanoparticles and Co5Al layered double hydroxide. Aluminum nitrate and cobalt nitrate are added into deionized water, then ammonium fluoride, urea and Fe3O4 superparamagnetic nanoparticles are added and ultrasonic dispersion is carried out, the obtained mixed solution is subjected to hydrothermal reaction, and after cooling, washing and drying, the catalyst is obtained. When used, the catalyst is added into water containing pesticides, peroxymonosulfate is added for oscillation reaction, and finally the catalyst is separated through an external magnetic field. The catalyst can be quickly separated and recovered through an external magnetic field, has good repeated use performance, good chemical stability and structural stability, high catalytic activity and strong anti-interference ability. The catalytic system reaction mechanism of the application is clear, and the free radical route is dominant, so that the degradation thoroughness and reliability are ensured.

This invention discloses a Pt-CoMo-NC hollow structure catalyst for hydrogen production from ammonia borosilicate hydrolysis and its preparation method. The preparation method includes: dissolving cobalt nitrate in methanol; dissolving 2-methylimidazole in another methanol solution; rapidly adding the cobalt nitrate methanol solution to the 2-methylimidazole methanol solution under stirring, continuing stirring at 25-30℃ for 10-72 h, centrifuging, washing, and vacuum drying to obtain ZIF-67 powder; completely dissolving a Mo source and chloroplatinic acid in a solvent, adding the ZIF-67 powder to the solution under stirring at 20-35℃, and continuing stirring at this temperature for 10-60 min; continuously stirring at 60-80℃ until the solvent is completely evaporated to obtain MoPt / ZIF-67; and carbonizing MoPt / ZIF-67 in an inert gas at a temperature of 500-950℃ to obtain the Pt-CoMo-NC catalyst. This catalyst exhibits excellent performance in catalyzing the hydrogen production from ammonia borosilicate hydrolysis and has promising application prospects.

This invention provides a lithium-ion battery cathode material, its preparation method, and its application. The raw materials for preparing the cathode include acetylene black, nitric acid solution, cobalt nitrate solution, polytetrafluoroethylene emulsion, water, isopropanol, and copper chloride. This invention uses electrostatic adsorption to uniformly load cobalt ions onto the surface of acetylene black, followed by oxidation treatment to obtain an acetylene black / cobalt tetroxide composite material with uniform dispersion characteristics. Furthermore, by employing a solution impregnation method using fibrous powder materials, and placing them in a copper chloride / isopropanol system for static treatment, not only is spontaneous and uniform adsorption of copper chloride achieved, but the localized catalyst enrichment problem easily caused by traditional mechanical stirring methods is also avoided, significantly improving the dispersion uniformity of the active catalytic components.

The application discloses a kind of cathode material for low-temperature metal fuel cell and its preparation method and application, preparation nitrogen-doped carbon nanotube as carrier;Utilize the liquid phase oxidation-reduction method of potassium permanganate and manganese sulfate, and introduce cobalt nitrate to carry out one-step hydrothermal synthesis;Utilize the doping effect of cobalt ion to control product crystal phase, and synthesize the rod-shaped structure of MnOOH and CoMn2O4 Nanocomposite on carrier.The obtained cathode material is through the synergistic effect of nitrogen-doped carbon carrier and metal oxide, significantly reduce the energy barrier of low-temperature oxygen reduction reaction.The cathode material has 0.79 V half-wave potential and 5.58 mA·cm ‑2 Limit diffusion current density under-10 ℃ environment;The assembled aluminum-air battery shows 1.56 V open-circuit voltage and 9.71 mW·cm ‑2 Power density under-40 ℃ environment, can be discharged stably for 16.2 h under 2 mA·cm ‑2 Current density, better than commercial Pt / C catalyst.In cold region emergency power supply, polar scientific expedition, military equipment and other extreme low-temperature scenes have significant application value.

This invention proposes a boron-phosphorus co-doped multi-element alloy catalyst supported on a metal oxide substrate, its preparation method, and its application. It belongs to the technical field of sodium borohydride hydrolysis hydrogen production materials. The method involves loading cobalt salts (such as cobalt chloride or cobalt nitrate), iron salts (such as ferric chloride or ferric nitrate), and hypophosphite (such as sodium hypophosphite) onto a support (such as γ-alumina or titanium dioxide) using an initial wet impregnation method. Sodium borohydride solution is added for chemical reduction, and boron is added for doping. After washing the reduction product, the catalyst is dried to obtain the supported boron-phosphorus co-doped multi-element alloy catalyst. When used as a sodium borohydride hydrolysis hydrogen production catalyst, it provides a maximum hydrogen production rate of 12729.78 mL·g under optimal conditions. cat ‑1 ·min ‑1 It produces 100% of the theoretical hydrogen yield and features good catalytic performance, simple preparation method, abundant raw materials, and low cost.

This invention discloses a modified biochar-supported CoNiFe-LDH catalyst, its preparation method, and an application, relating to the technical field of catalytic materials. Using corn stalk biochar as raw material, the biochar is modified through sequential calcination, acid washing, alkali activation, and recalcination to improve its specific surface area and surface activity. The modified biochar is further introduced into a mixed metal salt solution composed of cobalt nitrate hexahydrate, nickel chloride hexahydrate, and ferric nitrate nonahydrate. A mixed alkaline solution composed of sodium hydroxide and sodium carbonate is added dropwise, and under heating and aging conditions, in-situ growth of CoNiFe-LDH is achieved on the surface of the modified biochar, yielding a modified biochar-supported CoNiFe-LDH composite material. This method is simple, highly controllable, and produces a composite material with stable structure and uniform loading. The biochar and CoNiFe-LDH exhibit a good synergistic effect, making it suitable for catalysis, adsorption, and energy conversion.

This invention discloses a method for preparing a bifunctional catalyst support for oxygen evolution and hydrogen evolution, belonging to the technical field of electrocatalytic water splitting catalyst supports for hydrogen production. The method includes the following steps: adding cobalt nitrate, lanthanum nitrate, and nitric acid M to methanol until completely dissolved to form solution A; adding 2-methylimidazole to methanol until completely dissolved to form solution B; pouring solution A into solution B to obtain a precipitate; ball milling and sintering the precipitate to obtain the bifunctional catalyst support for oxygen evolution and hydrogen evolution; subsequently loading this support with noble metals / non-noble metals can effectively anchor and disperse the noble metals / non-noble metals, enhancing the overall activity and stability of the catalyst. Simultaneously, this bifunctional catalyst support can synergistically catalyze with the subsequently loaded noble metals, further improving the overall activity of the catalyst.

This invention relates to the field of heterogeneous catalysts, specifically to a method for preparing and applying an iron-cobalt-based silica hydrogenation catalyst. The invention provides a method for preparing an iron-cobalt-based silica catalyst, comprising the following steps: preparing a kcc-1 precursor by heating a mixture of CTAB with urea, tetraethyl orthosilicate with n-butanol, and cyclohexane. Cobalt nitrate and ferric chloride are dissolved in water, thoroughly mixed with a support, and then sodium borohydride is added and reacted in a reactor. After separation, washing, and drying, the catalyst is obtained, which can be used for the reduction reaction of nitrobenzene. The catalyst of this invention has the characteristics of high metal loading, high catalytic efficiency, and a simple preparation method, convenient operation, mild reaction conditions, and no highly hazardous compounds involved in the reaction. It avoids high-temperature reactions, reducing costs and environmental impact in industrial applications.

This invention discloses a bromine / cobalt co-doped hollow rod-shaped carbon nitride photocatalyst and its preparation method, belonging to the technical field of photocatalytic materials and CO2 resource utilization. The invention involves the self-assembly of melamine and cyanuric acid to form a supramolecular rod-shaped precursor, followed by thermal polymerization to obtain hollow rod-shaped carbon nitride (RCN). Using RCN as a support and cobalt nitrate and hexadecyltrimethylammonium bromide as doping sources, a hydrothermal reaction is then performed to prepare the bromine / cobalt co-doped hollow rod-shaped carbon nitride Br / Co-RCN photocatalyst. This catalyst exhibits a hollow rod morphology, a large specific surface area, and uniform doping of bromine and cobalt within the carbon nitride framework. The catalyst of this invention demonstrates excellent photocatalytic CO2 reduction performance under simulated sunlight, achieving a CO yield of 130.06 μmol·g. ‑1 ·h ‑1 Furthermore, the preparation process is simple, the conditions are mild, and the reproducibility is good, showing promising application prospects.

The application belongs to the field of hydrogen production material preparation, and in particular to a preparation method of a nano-cone supported nanosheet electrocatalyst. The method comprises: dissolving 0.5-1.0 g of cobalt nitrate, 0.2-0.5 g of zinc nitrate, 0.05-0.1 g of ammonium fluoride and 0.3-0.5 g of urea into 40-80 ml of water, pretreating foamed nickel, stirring, reacting, cooling, cleaning and drying; calcining the prepared sample at 300-400 DEG C for 1-3 h to obtain a ZnCo2O4 sample. Then, an electrolyte is 0-0.5 mol / l cobalt nitrate solution. The ZnCo2O4 sample grown on the foamed nickel is used as a working electrode. Ag / AgCl is used as a reference electrode, and Pt is used as a counter electrode to perform an electrochemical deposition reaction at a corresponding electrodeposition potential of-0.5-1.5 V for 5-25 min. The sample is washed and dried. Calcining the sample in air at 300-400 DEG C for 1-3 h can obtain a nano-cone supported nanosheet ZnCo2O4@Co3O4. The nano-cone supported nanosheet material can solve the problems of material uniformity, accelerate electron transmission, improve active site exposure and the like.

This invention discloses a ternary transition metal sulfide (CuCoNiS) x The preparation method of electrode materials and their performance in electrocatalytic sulfur oxidation (SOR) coupled hydrogen production. Ternary transition metal hydroxides were prepared by electrodeposition using copper nitrate (Cu(NO3)2), nickel nitrate (Ni(NO3)2), and cobalt nitrate (Co(NO3)2) as copper, nickel, and cobalt sources, respectively. Based on this, CuCoNiS was prepared by hydrothermal in-situ sulfidation using sodium sulfide as the sulfur source. x Compared to single-site copper sulfide (CuS), the introduction of Co and Ni effectively modulates the electronic structure of the catalyst, enhancing its conductivity and structural stability, and significantly improving its catalytic activity and resistance to sulfur poisoning in the electrocatalytic sulfur oxidation reaction (SOR). The catalyst prepared in this invention exhibits excellent electrocatalytic performance and long-term stability, and the synthesis process is relatively simple. It is suitable for energy conversion fields such as hydrogen sulfide decomposition to produce hydrogen, showing good prospects for industrial application.

This application relates to the field of cobalt hydroxide preparation technology, specifically to an intelligent preparation process for cobalt hydroxide nanocomposite materials. The process includes: weighing cobalt nitrate and polyvinylpyrrolidone into a mixing container, adding deionized water, and performing ultrasonic mixing; collecting the temperature at each set position and adjustment interval within the mixing container at each time point; determining a first adjustment coefficient for each position within each adjustment interval; determining the significant value of the temperature change response at each position, and combining this with the first adjustment coefficient to obtain a second adjustment coefficient for each position within each adjustment interval; using a PLC control system to regulate the temperature during the ultrasonic mixing process; passing argon gas through the ultrasonically mixed solution, adding sodium borohydride solution, and then adding an equal volume of potassium tetrachloropalladate and potassium tetrachloroplatinate solutions, followed by centrifugation, washing, and drying to obtain the cobalt hydroxide nanocomposite material. This application improves the accuracy of detecting residues on the wafer cleaning surface.

This invention discloses a mesoporous cobalt-zinc bimetallic single-atom catalyst, its preparation method, and its application, belonging to the field of catalyst material technology. The method includes the following steps: S1, zinc nitrate hexahydrate and 2-methylimidazole are added to methanol and mixed to obtain solution A and solution B. Solution A is then added to solution B and mixed. The mixture is stirred at room temperature, and after centrifugation, washing, drying, and grinding, ZIF-8 powder is obtained. S2, cobalt nitrate hexahydrate and 1,10-phenanthroline monohydrate are added to methanol and mixed. Then, ZIF-8 powder is added, and the mixture is stirred at 50°C. After centrifugation, washing, drying, and grinding, Co-phen / ZIF-8 powder is obtained. S3, the Co-phen / ZIF-8 powder is calcined to obtain the mesoporous cobalt-zinc bimetallic single-atom catalyst. The catalyst prepared by this invention exhibits excellent performance in the catalytic synthesis of cyclic carbonates.

The application provides a preparation method of a MOFs derived C-coated CoFe alloy catalyst, and is characterized by comprising the following steps: S1: after mixing cobalt nitrate, iron nitrate, a ligand for forming a MOFs precursor and a solvent sufficiently, the mixture is subjected to a solvothermal reaction under heating at 150 DEG C to obtain a precursor CoxFe-MOF-74, wherein the doping molar ratio of the cobalt nitrate to the iron nitrate in the two raw materials is X, and X is (0.05-0.5); S2: after the precursor is discharged of air by using a hydrogen-argon mixed gas at room temperature, high-temperature pyrolysis reduction is further carried out under a hydrogen atmosphere to obtain a C-coated CoFe alloy catalyst; and the reduction temperature y is (500-575) DEG C. The prepared catalyst effectively improves the CO2 conversion rate. The catalyst is applied to photocatalytic reduction of CO2.

A method for preparing and applying cobalt nitrate-modified Spartina alterniflora biochar belongs to the field of wastewater treatment technology. The steps are as follows: Spartina alterniflora powder is soaked in NaOH solution, then washed with deionized water until the pH reaches neutral, and dried in an oven to obtain NaOH-treated Spartina alterniflora biochar; the treated Spartina alterniflora biochar is stirred to fully disperse; then Co(NO3)2·6H2O is added, mixed, and stirred at room temperature to allow the Co... 2+ The cobalt nitrate-modified Spartina alterniflora biochar was thoroughly impregnated with NaOH to form a mixture. The mixture was dried in an oven, then pyrolyzed in a tube furnace at 850°C under N2 atmosphere at a rate of 5°C / min. After cooling, the product was removed, ground, and then cobalt nitrate-modified Spartina alterniflora biochar was obtained. This invention offers a simple and reproducible method, readily available biochar precursors, and low preparation costs, making it suitable for large-scale production. The resulting cobalt nitrate-modified Spartina alterniflora biochar shows promising application prospects in areas such as the treatment of organic pollution in aquatic environments.

This invention relates to the field of catalytic materials technology, specifically disclosing a cobalt-molybdenum based CO sulfur-resistant shift catalyst and its preparation process. The catalyst uses cobalt nitrate and ammonium ammonium paramolybdate as active precursors, alumina as a support, and introduces an imine-linked dopamine-silsesquioxane-cerium coordination composite structure and 2,4,6-tris(4-hydroxyphenyl)-1,3,5-triazine. Simultaneously, it is combined with basic promoters, electronic regulation promoters, and dispersing promoters to synergistically construct a multi-scale regulation system. Through the synergistic coupling of dynamic covalent networks, metal coordination structures, and cage-like confinement structures, effective regulation of the dispersion state, interfacial bonding force, and electronic structure of the active components is achieved. The preparation method includes the preparation of a metal precursor solution, impregnation aging, drying calcination, and sulfurization treatment. The catalyst of this invention exhibits high shift reaction activity, excellent resistance to CO poisoning, and good sulfur resistance stability under high CO and sulfur-containing conditions, making it suitable for carbon monoxide shift reactions in sulfur-containing syngas systems.