357 results about "Manganese salt" patented technology

The application discloses a preparation method of a catalyst for liquid-phase refining of crude octanol, and the preparation method comprises the following steps: (1) mixing pretreated fly ash and pseudo-boehmite, adding deionized water and nitric acid, stirring until a colloid is formed, drying the colloid, mixing the dried colloid with kaolin, and obtaining a carrier through kneading, extrusion molding, drying and calcination; (2) taking a nickel salt, a manganese salt and a zinc salt as active components, taking a calcium salt as an auxiliary component, dissolving the active components and the auxiliary component in deionized water to obtain a salt solution, adding n-hexane into the salt solution and stirring uniformly to prepare an impregnation solution, immersing the carrier in the impregnation solution, and obtaining the catalyst through washing, drying and calcination. The catalyst prepared by the method is mainly used in a liquid-phase refining reaction process of crude octanol, and has high activity stability and selectivity.

The invention discloses a metal element doped MnO2 and MnFe oxide composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gas desulfurization and denitrification. The preparation method comprises the following steps: dissolving potassium permanganate, divalent manganese salt and doped metal salt in water for reaction to prepare metal element doped MnO2; and mixing and reacting with a template agent, ferric salt and sodium salt, drying and roasting to obtain the final catalyst. The MnO2 electronic structure is modulated by doping metal elements, and the three-dimensional porous structure of the MnFe oxide is constructed by using the template agent, so that the catalyst has efficient adsorption and strong catalytic oxidation capacity, NO and SO2 can be synergistically removed at the same time, and the catalyst has desulfurization and denitrification activity in a wide temperature range of 30-300 DEG C, and is suitable for industrial production. And liquid ammonia does not need to be used in the purification process, so that the purification agent is high in safety and is particularly suitable for purification treatment under complex flue gas conditions in the non-electric industry.

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention relates to the field of efficient integrated assemblies of PEM water electrolysis hydrogen production systems, and discloses an efficient integrated assembly for a PEM exchange membrane water electrolysis hydrogen production system, an anode electrode unit in the integrated assembly comprises a ruthenium-based high-entropy metal oxide electrocatalyst, and the ruthenium-based high-entropy metal oxide electrocatalyst comprises ruthenium, tin, manganese, chromium and tantalum elements; the preparation method of the ruthenium-based high-entropy metal oxide electrocatalyst comprises the following steps: grinding solid inorganic ruthenium salt, tin salt, manganese salt, chromium salt, tantalum salt and sodium chloride to obtain a metal salt mixture; carrying out ball milling to obtain a high-entropy metal oxide precursor; and carrying out heat treatment and water washing treatment on the precursor to obtain the ruthenium-based high-entropy metal oxide electrocatalyst. The invention also discloses application of the electrocatalyst in water electrolysis oxygen evolution reaction in an acid solution and water electrolysis hydrogen production reaction of a PEM proton exchange membrane, and the electrocatalyst shows excellent electrocatalytic activity.

The invention discloses a preparation method and application of a high-entropy layered double hydroxide oxygen evolution catalyst, and relates to the field of oxygen evolution reaction catalysis, and the preparation method comprises the following steps: S1, washing foamed nickel in absolute ethyl alcohol and deionized water, and then carrying out ultrasonic treatment in a hydrochloric acid solution to obtain pretreated foamed nickel; s2, adding ferric salt, cobalt salt, nickel salt, manganese salt, zinc salt and a proper amount of urea into deionized water, then adding ammonium fluoride, and uniformly stirring to obtain a mixed solution; and S3, transferring the mixed solution and the pretreated foamed nickel into a reaction kettle, carrying out a hydrothermal reaction, and washing and drying the obtained product to obtain the high-entropy layered double hydroxide oxygen evolution catalyst. According to the method, the key regulation and control effect of NH4F on the structure, chemical and electro-catalytic properties of HELDHs in the synthesis process of the HELDHs is analyzed, and the performance enhancement is attributed to NH4F-induced morphology and crystal engineering and catalytic active cation vacancies generated in situ through selective leaching of Zn < 2 + > and adsorption of sulfate under the alkaline condition.

The preparation method mainly comprises the following steps: dissolving chloroplatinic acid, lanthanum salt and manganese salt in water according to a certain proportion, adding a complexing agent, adjusting the pH value, and carrying out gelation, drying and high-temperature calcination to obtain a perovskite precursor; and treating in a reducing atmosphere, so that platinum atoms are selectively dissolved out from crystal lattices, high-dispersion platinum nanoparticles are formed on the surface, and finally, the composite catalyst with extremely low platinum loading capacity is obtained. According to the method, platinum species are stably anchored through the perovskite carrier, the platinum atom utilization rate and catalytic stability are remarkably improved, excellent electrocatalytic activity and durability are shown in the oxygen reduction reaction, and the method can be widely applied to energy conversion equipment such as zinc-air cells and fuel cells and has important practical application value.

The invention belongs to the technical field of immunology, and discloses a manganese salt adjuvant system based on dextran particle capsule shrinkage and a preparation method and application thereof.The manganese salt adjuvant system comprises beta-dextran particles GPs of a hollow spherical shell structure from yeast and manganese hydroxide colloid encapsulated in the dextran particles, the preparation method comprises the following steps: soaking the GPs in a MnCl2 solution, after the inner cavity of the GPs fully absorbs the MnCl2 solution, separating the GPs adsorbing MnCl2, then adding the GPs into a NaOH solution, forming stable manganese hydroxide colloid by manganese ions in the inner cavity of the GPs, and washing after separation to obtain the dextran particle encapsulated manganese salt adjuvant system. The GPMnOH particles carry various antigens at the same time in various modes such as electrostatic adsorption, chemical coupling or hydrophobic interaction, and an ideal carrier is provided for co-delivery immunization of the antigens and adjuvants.

The invention discloses a lithium manganate conductive material and a preparation method thereof, and the lithium manganate conductive material comprises a lithium manganate inner net layer which is a nano network layer formed by connecting lithium manganate crystal grains; the graphene and / or carbon nanotube conductive carbon outer net layer is deposited on the surface of the inner net layer. The lithium manganate crystal grains are uniform and fine, and the crystal grains are of a continuous net-shaped arrangement structure. Dissolving and mixing the polymer nanofiber, manganese salt, lithium salt and M-doped salt to form gel, drying, and carrying out two-stage programmed heating calcination in an oxygen-containing atmosphere to obtain a lithium manganate nano inner net layer; ultrasonically dispersing the lithium manganate nano inner net layer in water, adding acidified carbon nanotubes and / or graphene oxide dispersion liquid, and depositing the acidified carbon nanotubes and / or graphene oxide dispersion liquid on the surface of the inner net layer to form a conductive carbon outer net layer. The obtained lithium manganate conductive material has a continuous large-area two-dimensional network structure, shows high conductivity, high specific capacity and excellent cycling stability, and can be widely applied to the fields of lithium ion batteries, electrochemical lithium extraction, lithium ion adsorption and the like.

This invention belongs to the field of biochemical detection and discloses a portable hepatitis biomarker detection kit. The kit contains a hydrogel; the hydrogel is obtained by dispersing hollow manganese dioxide in water to obtain an H-MnO2 dispersion, mixing the H-MnO2 dispersion with sodium alginate solution to obtain a mixed solution, and then adding a calcium salt solution to obtain the hydrogel. The hollow manganese dioxide is obtained by etching manganese Prussian blue analog nanoparticles with sodium hydroxide. The manganese Prussian blue analog nanoparticles are prepared from potassium ferricyanide, polyvinylpyrrolidone, and manganese salts. This invention utilizes the color change of hollow manganese dioxide in relation to TMB to construct a method for detecting hepatitis biomarkers using a smartphone to capture signals. This kit reduces the detection cost of hepatitis biomarkers, does not require large instruments, and is highly portable and widely applicable, possessing great potential as a novel point-of-care testing device.

The application belongs to the technical field of lithium ion batteries, and particularly relates to a kind of one-dimensional LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 ternary layered oxide positive electrode material and a preparation method thereof, which comprises the following steps: adding a nickel salt, a cobalt salt and a manganese salt into water, stirring and dissolving to obtain a solution A; adding LiMn2O4 into the solution A and stirring uniformly to obtain a solution B; mixing a lithium salt with water to obtain a solution C, and under stirring, adding the solution C into the solution B to obtain a solution D; evaporating the solution D under stirring to obtain a precursor powder; and sintering the precursor powder at 400-600 DEG C, and then sintering at 750-850 DEG C to obtain the positive electrode material. 1 / 3 Co 1 / 3 Mn 1 / 3 O2 material.

The invention belongs to the technical field of electrode materials, and particularly relates to a MnCo2O4 / ZnCo2O4 nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: taking soluble manganese salt and soluble cobalt salt as raw materials, taking foamed nickel as a carrier, carrying out hydrothermal reaction in an alkaline environment to obtain MnCo-LDH / NF, then immersing the MnCo-LDH / NF in a precursor solution composed of the soluble cobalt salt, soluble zinc salt and 2-methylimidazole, carrying out coordination reaction to obtain MnCo-LDH ZIF-67 / ZIF-8, and finally carrying out heat treatment to obtain the MnCo2O4 / ZnCo2O4 nano composite material. In the MnCo2O4 / ZnCo2O4 nano composite material obtained by the method disclosed by the invention, MnCo2O4 with a nanorod structure and ZnCo2O4 with a dodecahedron structure form a heterojunction, so that the defect of poor conductivity of MnCo2O4 is overcome.

The invention relates to the technical field of denitration catalysts, and discloses a composite oxide catalyst and a preparation method thereof. The preparation method of the composite oxide catalyst comprises the following steps: mixing a manganese salt, a cobalt salt and deionized water, and carrying out a first precipitation reaction to obtain a first mixture; cerium salt and the first mixture are mixed and subjected to a second precipitation reaction, and a second mixture is obtained; sequentially drying and sintering the second mixture to obtain a composite oxide catalyst; wherein the molar ratio of the manganese element in the manganese salt to the cobalt element in the cobalt salt is (1.5-3): 1, preferably (1.9-2.1): 1. The preparation process of the composite oxide catalyst is simple, raw material loss is not caused, and the composite oxide catalyst prepared by the method has excellent denitration performance under a low-temperature condition.

The invention discloses a preparation method and application of hollow lithium manganate microspheres based on a sound-induced microbubble template, and belongs to the field of lithium ion batteries. The method comprises the following steps: dissolving a surfactant in deionized water to prepare a surfactant solution with the concentration of 1-2g / L; high-power ultrasonic waves are applied to the surfactant solution, micron-sized bubbles are generated in the surfactant solution, and microbubble template liquid is obtained; adding manganese salt and an oxidizing agent into the microbubble template liquid under the continuous action of ultrasound, so that the manganese salt is oxidized at a gas-liquid interface of the micron-sized bubbles to form a hollow manganese dioxide precursor; centrifugally collecting, washing and drying to obtain hollow manganese dioxide microspheres; the hollow manganese dioxide microspheres and a lithium source are uniformly mixed and then subjected to segmented heat treatment, and the hollow lithium manganate microspheres are obtained after natural cooling, so that the problems that the template removal step is tedious, impurities are possibly introduced, the temporary template stability is poor, and the size distribution is non-uniform are solved.

A method of recovering a nickel, cobalt, and manganese salts includes removing impurities from an acidic aqueous leach solution including cobalt, manganese, and nickel salts to produce a purified aqueous solution including the metal salts and remaining impurity salts. The method includes extracting the purified aqueous solution in a first liquid-liquid extraction step using a first organic extractant to produce a first aqueous raffinate solution including the cobalt, manganese, and nickel salts and a first loaded organic solution including one or more of the remaining impurity salts from the purified aqueous solution. The method further includes extracting the cobalt, manganese, and nickel salts from the first aqueous raffinate solution in a second liquid-liquid extraction step using a second organic extractant to produce a second loaded organic solution including the cobalt, manganese and nickel salts and a second aqueous raffinate solution comprising one or more of the remaining impurity salts.

The invention provides a preparation method of manganese-doped iron phosphate, and relates to the technical field of lithium ion battery positive electrode materials, the preparation method comprises the following steps: S1, preparing a phosphoric acid solution, a ferrite solution, a phosphorus-oxygen mixed solution containing a phosphorus source and an oxidizing agent, a divalent manganese salt solution and an oxidizing agent solution; s2, adding a base solution, and pumping the ferrite solution and the phosphorus-oxygen mixed solution while stirring to obtain slurry A; s3, filtering and washing the slurry A to obtain a filter cake; s4, mixing and pulping the filter cake and water, sequentially adding a divalent manganese salt solution, an oxidant solution and phosphoric acid, heating to 80-100 DEG C, and carrying out conversion reaction for 1-3 hours to obtain slurry B; s5, filtering, washing and drying the slurry B to obtain manganese-doped iron phosphate dihydrate, and calcining the iron phosphate dihydrate to obtain manganese-doped anhydrous iron phosphate; the manganese salt solution is added in the precursor preparation stage, so that the manganese element is doped into iron phosphate crystal lattices in the form of ions, and the bulk phase doping effect can be better improved.

The application relates to the technical field of organic synthesis, and discloses a preparation method of a hydrocarbyl carboxylic acid, which comprises the following steps: mixing a hydrocarbyl aldehyde, an oxidizing agent and a first metal salt to perform pre-reaction, and then mixing the reaction system obtained through the pre-reaction with a second metal salt to perform reaction; wherein the first metal salt is selected from at least one of a sodium salt, a potassium salt, a calcium salt, a lithium salt, an iron salt and a copper salt; and the second metal salt is selected from at least one of a zinc salt, a manganese salt, a cobalt salt, a palladium salt and a silver salt. The preparation method of the hydrocarbyl carboxylic acid can greatly shorten the reaction time, and improve the raw material conversion rate, the target product selectivity and the target product purity of the aldehyde oxidation acid reaction.

The application relates to the technical field of MOF-based catalysts, in particular to a noble metal MOF-based catalyst, a preparation method and application. The catalyst is prepared by the method. The method comprises the following steps: preparing a noble metal-ligand chelation solution; adding manganese salt, a second organic ligand, a second organic solvent and water into the noble metal-ligand chelation solution in sequence, adjusting the pH value to 3-5 after stirring and dissolving, and obtaining a precursor suspension; cooling the precursor suspension to room temperature after a crystallization reaction; then, performing suction filtration, and performing first washing treatment on the obtained solid until the washing liquid is colorless and transparent; performing first vacuum drying treatment on the obtained solid, and obtaining a precursor powder; and performing reduction treatment, second washing treatment and second vacuum drying treatment on the precursor powder in sequence, and obtaining the catalyst. The application is the application of the catalyst in adsorptive catalytic oxidation of formaldehyde, and the conversion rate of formaldehyde can be greater than or equal to 95% at room temperature.

The invention relates to the technical field of adsorbent materials, and discloses a CoMn2O4 spinel adsorbent and a method for removing trivalent antimony in a water body by using the CoMn2O4 spinel adsorbent. The adsorbent is prepared by adopting a co-precipitation and low-temperature thermally induced crystallization synergetic green process: dissolving cobalt salt and manganese salt according to a stoichiometric ratio, dropwise adding a sodium hydroxide solution for co-precipitation, washing an obtained precursor, and drying at 80-120 DEG C under normal pressure for 12-48 hours to directly obtain the adsorbent. According to the method, the spinel material with low crystallinity, high specific surface area and rich surface hydroxyl is controllably synthesized by regulating and controlling the concentration of the precipitator and the drying condition, and the problems of active site loss and high energy consumption caused by traditional high-temperature calcination are avoided. When the composite material is used for treating wastewater containing trivalent antimony, antimony ions can be efficiently removed through the adsorption effect under the appropriate pH condition, excellent adsorption capacity is shown, the technology is simple, cost is low, safety is good, and an efficient and stable adsorption material and a feasible method are provided for water body antimony pollution treatment.

The invention relates to the technical field of preparation of lithium ion battery positive electrode materials, in particular to a method for regulating and controlling a high-exposure {010} crystal face of a manganese-rich phosphate-based positive electrode material, which comprises the following steps: weighing manganese salt (MnO2, MnC2O4. 2H2O, MnCO3, Mn (H2PO4) 2, MnC4H6O4. 4H2O and the like), ferric salt (FeSO4. 7H2O, Fe2O3, FePO4 and the like), lithium salt (LiOH, Li2CO3, CH3COOLi, LiH2PO4 and the like), phosphate (NH4H2PO4) and sulfate (MgSO4, NaSO4, FeSO4. 7H2O and the like) according to the molar ratio of (1-n): n: 1: 1: 0.01 (n = 0.4, 0.5, 0.6 and 0.7), adding 10-50% of organic drying at the temperature of 80-110 DEG C to obtain a precursor; putting the precursor into a tubular furnace, presintering for 2-5 hours at the temperature of 300 DEG C in an argon atmosphere, and then naturally annealing; and heating to 700 DEG C, sintering for 6-10 hours in an argon atmosphere, and naturally annealing to obtain the lithium manganese iron phosphate positive electrode material with the highly exposed {010} crystal face. After the highly-exposed {010} crystal face material LiMn0. 6Fe0. 4PO4 prepared by the method disclosed by the invention is circulated for 300 times at a high rate of 5C, the specific discharge capacity retention rate is as high as 95.7% and is far higher than 50.4% of that of an unmodified control sample.

This invention belongs to the field of core-shell material technology and discloses a core-shell material based on nickel-manganese oxide / nickel-manganese organic framework and its preparation method, including the following steps: mixing nickel salt, manganese salt and organic ligand solution, and carrying out a hydrothermal reaction under alkaline conditions to synthesize a nickel-manganese organic framework precursor; subjecting the nickel-manganese organic framework precursor to programmed temperature heat treatment in a mixture of inert gas and oxygen to obtain a heterogeneous nanostructured nickel-manganese oxide / nickel-manganese organic framework core-shell material. By precisely controlling the concentration of the organic ligand solution and the pH value of the reaction system, and by optimizing the synthesis conditions, uniform and controllable growth of the nickel-manganese organic framework core is achieved.

The application provides a one-dimensional high-entropy alloy, a preparation method and application of the one-dimensional high-entropy alloy in CO2 ring addition reaction, and relates to the technical field of high-entropy alloys.The molar ratio of iron salt, cobalt salt, nickel salt, manganese salt, chromium salt and cerium salt in the one-dimensional high-entropy alloy is 1:1:1:1:1:1;the high-entropy alloy has a fiber structure, the fiber has a hierarchical pore structure which is interconnected, including macropores or mesopores formed by decomposition of the self-sacrificing template 1, and mesopores or micropores formed by decomposition of the self-sacrificing template 2.Through improvement of the process conditions, the one-dimensional high-entropy alloy material with a unique structure can be prepared under relatively mild conditions, so that the whole reaction process is safer and more economical, and meets the goal of green chemistry and sustainable development.Meanwhile, the one-dimensional high-entropy alloy material prepared provides a large specific surface area, fully exposes active sites, and can realize efficient and stable conversion of the carbon dioxide ring addition reaction.

The application discloses a kind of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material and its preparation method;The application uses organic-inorganic hybrid fluoride manganese salt material as Mn 4+ Source preparation Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.The application uses organic-inorganic hybrid fluoride manganese salt material instead of all-inorganic fluoride manganese salt, manganese salt and permanganate as Mn 4+ Source, for preparing Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material, significantly improve the luminescent efficiency of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.

The application provides a preparation method of a two-dimensional Ru-Mn3O4 lithium-sulfur battery positive electrode catalyst and application thereof, and belongs to the field of nanometer material preparation. First, alanine, potassium nitrate, a manganese salt and a ruthenium salt are put into a grinding device, deionized water is added for grinding, and then drying is performed; then, preheating is performed through a heating device, and then calcination is performed; finally, the two-dimensional Ru-Mn3O4 lithium-sulfur battery positive electrode catalyst is obtained after washing and separation. The two-dimensional Ru-Mn3O4 lithium-sulfur battery positive electrode catalyst material prepared by the method has low cost, high efficiency, can fully exert the synergistic advantages of element doping and two-dimensional structure, and can significantly improve the application performance in lithium-sulfur batteries.

The invention provides a device and a method for preparing benzoic acid by continuously oxidizing methylbenzene liquid-phase air. The device is formed by sequentially connecting an air and toluene flow control unit, a series laminated microchannel mixer, a delay reaction tube and a gas-liquid separator in series. When the device is used for toluene air continuous oxidation reaction, pure toluene is used as a raw material, cobalt salt or a mixture of cobalt salt and manganese salt is used as a catalyst, and an initiator does not need to be added. Firstly, a catalyst is dissolved in methylbenzene to form a solution, then the solution and air enter the micro-mixer through the liquid flow control unit and the gas flow control unit respectively to be mixed and then enter the delayed reaction tube to react, and finally a liquid product is obtained through the gas-liquid separator. The device has very high oxidation efficiency, the conversion rate is close to 100% in terms of oxygen in air, benzoic acid is a main product, and the selectivity reaches 75.9%. In addition, the device also has the characteristics of high efficiency, small reaction volume, energy conservation and the like.

This invention belongs to the field of environmental catalytic materials technology, and relates to a rare earth-doped manganese-based low-temperature denitrification catalyst and its preparation method. The preparation steps of this invention are as follows: S1, stacking corrugated plates and flat plates to form functional units; S2, taking a specific amount of deionized water, then sequentially adding a dispersant, TiO2 powder, and a binder, and stirring several times to obtain a TiO2 suspension; S3, sequentially adding soluble manganese salt and soluble salts of rare earth elements to the TiO2 suspension, stirring to obtain an impregnation solution; and loading the impregnation solution onto the surface of the functional unit to obtain a modified functional unit, which is then sequentially dried and calcined to obtain the denitrification catalyst. This invention is particularly suitable for denitrification scenarios of medium- and low-temperature flue gas (150~300℃), solving the technical pain points of insufficient low-temperature activity and poor adaptability of traditional catalysts.

The application discloses a method for preparing submicron and micron alkylated graphene oxide by using coal, and comprises the following steps: 1, graphitizing coal powder to rearrange carbon atoms and grow submicron crystal regions; 2, oxidizing and peeling the graphitized coal under the action of sulfuric acid, phosphoric acid and potassium permanganate; 3, adding hydrogen peroxide to react with potassium permanganate and high-valence manganese salt in the solution until the solution turns yellow; 4, screening the solution to remove unreacted black impurities; 5, centrifuging the solution to reserve the precipitate, and then washing and centrifuging the precipitate with dilute hydrochloric acid and ethanol; 6, dispersing the precipitate with diethyl ether, and then obtaining graphene oxide powder through suction filtration. The prepared graphene oxide has an average size of 800 nm, an average layer number of 1-2 layers, and a yield of 107%. The method has simple steps, low cost and high yield, and is easy to realize industrial production, and has a very broad prospect in the present situation of urgently realizing high-value utilization of coal.

The invention relates to the technical field of electrode materials, in particular to a Co3S4 / MnCo-LDH / MnCo2S4 nano composite material as well as a preparation method and application of the Co3S4 / MnCo-LDH / MnCo2S4 nano composite material. The preparation method comprises the following steps: taking soluble manganese salt and soluble cobalt salt as raw materials, taking foamed nickel as a carrier, carrying out hydrothermal reaction in an alkaline environment to obtain MnCo-LDH / NF, then immersing the MnCo-LDH / NF in a precursor solution composed of the soluble cobalt salt and 2-methylimidazole, carrying out coordination reaction to obtain MnCo-LDH (ZIF)-67 / NF, and finally carrying out incomplete vulcanization on the MnCo-LDH (ZIF)-67 / NF by adopting thioacetamide to obtain the MnCo-LDH (ZIF)-67 / NF composite material. And the Co < 3 > S < 4 > / MnCo-LDH / MnCo < 2 > S < 4 > nano composite material is obtained. The technical defects of the MnCo2S4 are overcome by virtue of the Co3S4 and the MnCo-LDH.

The invention provides nickel modified manganese dioxide as well as a preparation method and application thereof. The preparation method of the nickel modified manganese dioxide comprises the following steps: S1, providing potassium permanganate, a reducing agent and nickel salt; s2, mixing the potassium permanganate, the reducing agent and the nickel salt in a water body to obtain a pretreatment solution; the molar ratio of the potassium permanganate to the reducing agent is (1-3): (0.6-2), and the molar ratio of the potassium permanganate to the nickel salt is (6-30): 1; s3, carrying out hydrothermal treatment on the pretreatment liquid to obtain a reaction liquid; the temperature of the hydrothermal treatment is 130-200 DEG C, and the duration of the hydrothermal treatment is 5-12 hours; and S4, carrying out solid-liquid separation treatment on the reaction liquid to obtain the nickel modified manganese dioxide. Nickel modification is carried out based on potassium permanganate and divalent manganese salt, exposure of the 110 crystal face is controlled, and the thallium removal rate of the manganese dioxide material can be increased.

The invention provides a high alloy steel gas nitriding catalyst precursor solution as well as a preparation method and a catalytic nitriding method thereof, and belongs to the technical field of nitriding. The high alloy steel gas nitriding catalyst precursor solution provided by the invention comprises a first precursor solution and a second precursor solution, the first precursor solution comprises the following components: rare earth metal salt, chromium salt, manganese salt, cobalt salt, nickel salt, citric acid and a solvent; the second precursor solution comprises the following components: chlorate, citric acid and a solvent. The first precursor solution and the second precursor solution have a synergistic effect, a compact passivation film on the surface of the high alloy steel is damaged through chloride ion chemical erosion in the nitriding heating process and is prevented from being regenerated in the nitriding process, catalyst components directly act on a material matrix, and the uniformity of a nitriding layer is remarkably improved; the first precursor solution can generate a perovskite type rare earth oxide film in situ, and efficient gas nitriding of high alloy steel can be realized, so that the thickness of a nitriding layer is increased.

This invention discloses a supported manganese antimonate ultra-low temperature sulfur- and water-resistant denitrification catalyst and its preparation method. The preparation method includes: step (1) dissolving manganese salt and antimony precursor in deionized water to prepare a mixed salt solution, stirring and mixing evenly at room temperature, adding urea solution as a precipitant, then adding activated carbon and stirring and mixing evenly to obtain a hydrothermal precursor slurry; step (2) transferring the hydrothermal precursor slurry to a reactor for hydrothermal treatment, and after multiple centrifugation, washing and filtration, drying and grinding the obtained solid to obtain carbon-supported precursor powder; step (3) calcining the carbon-supported precursor powder in an inert atmosphere in a reactor, and obtaining the supported manganese antimonate denitrification catalyst after natural cooling. According to the preparation method of the supported manganese antimonate ultra-low temperature sulfur- and water-resistant denitrification catalyst of this invention, the obtained catalyst has good sulfur poisoning resistance and high N2 selectivity.