104 results about "Lanthanum nitrate" patented technology

The invention discloses a perovskite type composite metal oxide oxygen carrier catalyst as well as a preparation method and application thereof, and belongs to the field of biomass chemical chain gasification / reforming. The oxygen carrier catalyst is of a La, Fe and Ni co-doped SrTiO3 perovskite structure, and active components Fe and Ni are embedded into a main body SrTiO3 perovskite crystal phase structure in an oxide or simple substance form; the method comprises the following steps: preparing an aqueous solution of lanthanum nitrate, strontium nitrate, nickel nitrate, ferric nitrate and citric acid, adding a mixed solution of tetrabutyl titanate and ethylene glycol into the aqueous solution, heating in a water bath, and stirring to form gel; drying and calcining the gel to obtain intermediate powder; and the intermediate powder is oxidized and reduced to form a high-temperature crystal structure under different atmospheres, and the perovskite type composite metal oxide oxygen carrier catalyst is obtained. The oxygen carrier catalyst provided by the invention has high tar conversion rate and stable cycle activity in the biomass chemical chain gasification / reforming process.

The invention discloses a preparation method of a lanthanum ferrite / zinc oxide composite material, which comprises the following steps: preparing lanthanum ferrite LFO, ultrasonically stirring ferric nitrate nonahydrate, lanthanum nitrate hexahydrate and a dispersing agent in a hydrothermal solvent to obtain a mixed solution, preparing an LFO / ZnO composite material, dispersing the LFO prepared in the step S1 and zinc acetate in ethanol, performing ultrasonic treatment, heating and stirring, and condensing and refluxing to obtain the LFO / ZnO composite material. Cooling, and continuously stirring in an ice-water bath; dropwise adding a NaOH ethanol solution at the temperature of 0 DEG C, and stirring for 2 hours; adding deionized water, stirring, centrifuging to remove the supernatant, dispersing the precipitate powder in ethanol, and carrying out hydrothermal reaction; after the hydrothermal reaction is finished, centrifuging the solution, and after centrifugation is finished, pouring out the solution to obtain a precipitate; washing with deionized water and an ethanol solution, drying the precipitate, and calcining the dried powder in a muffle furnace to obtain a p-n type LFO / ZnO composite material; according to the method, the size of lanthanum ferrite can be accurately regulated and controlled through a cooperative regulation strategy of the solvent proportion and the ligand size, and different types of gases can be accurately distinguished.

The application relates to the technical field of magnetic materials, in particular to a preparation method of high-performance heavy-rare-earth-free neodymium iron boron magnets; the preparation method comprises the following steps: rapidly quenching a main phase alloy into a flake, obtaining coarse powder after hydrogen breaking; immersing the coarse powder in an ethanol mixed solution containing lanthanum nitrate and cerium nitrate, drying the pretreated coarse powder after ultrasonic-magnetic stirring cooperative treatment; adding an antioxidant and a lubricant into the pretreated coarse powder, preparing fine powder with an average particle size of 2-3.5 microns through airflow milling; performing magnetic field orientation compression molding on the fine powder under nitrogen protection, improving the density through cold isostatic pressing; finally, performing vacuum sintering and step-by-step tempering treatment to obtain the high-performance heavy-rare-earth-free neodymium iron boron magnets; wherein the main phase alloy is composed of the following components with mass percentage: 28-31wt.% Pr25Nd75, 0.88-1.2wt.% B, 0-0.1wt.% Al, 0.05-0.3wt.% Ti, 0.05-0.4wt.% Cu, 0.5-1.4wt.% Co, 0.1-0.4wt.% Ga, and the balance is Fe; the prepared neodymium iron boron magnet has the dual characteristics of high coercivity and high remanence, and effectively guarantees the performance and quality.

The invention relates to the technical field of light conversion adhesive films, in particular to a light conversion adhesive film for a photovoltaic module and a preparation method thereof.The preparation method comprises the following steps that 1, nitric acid and europium oxide are added into deionized water and stirred, lanthanum nitrate hexahydrate is added, ammonia water is dropwise added in a water bath while stirring, the pH of a solution is adjusted, suction filtration and drying are conducted, then the solution is placed in a muffle furnace, heating calcination is conducted, and a precursor is obtained; the composite light conversion powder is prepared; step 2, diluting vinyltris (2-methoxyethoxy) silane with an ethanol aqueous solution, and spraying the diluted vinyltris (2-methoxyethoxy) silane on the composite light conversion powder to obtain pretreated composite light conversion powder; and 3, putting the modified ethylene-vinyl acetate copolymer resin into a mixer, adding the pretreated composite light conversion powder, a cross-linking agent, an assistant cross-linking agent, an ultraviolet light absorber and modified zirconium phosphate, uniformly mixing, putting into a casting machine, and carrying out plasticizing extrusion, stretching, traction and rolling to prepare the light conversion adhesive film for the photovoltaic module.

The application provides a variable-price rare earth element doped black titanium dioxide catalyst and a preparation method and application thereof, and belongs to the technical field of environmental functional materials and water pollution treatment. The catalyst is prepared by a sol-gel method combined with calcination in a hydrogen-argon mixed atmosphere, with tetrabutyl titanate as a titanium source and lanthanum nitrate and cerium nitrate as rare earth doping sources. Lanthanum / cerium doping can effectively inhibit the generation of rutile phase in the black titanium dioxide, increase the specific surface area, narrow the band gap and construct oxygen vacancy defects, and significantly improve the photocatalytic activity. The preparation process is simple, the cost is controllable, the catalyst has a remarkable selective degradation effect on specific dyes, and an efficient solution is provided for dye wastewater treatment.

The invention discloses a preparation method of porous tungsten with high compressive strength, which comprises the following steps: providing tungsten powder, an organic binder and lanthanum nitrate hexahydrate, the addition amount of the organic binder is 0.8 wt.%-1.2 wt.% of the mass of the tungsten powder, and the addition amount of the lanthanum nitrate hexahydrate is 0.1 wt.%-0.4 wt.% of the mass of the tungsten powder based on lanthanum oxide; the preparation method comprises the following steps: dissolving an organic binder and lanthanum nitrate hexahydrate in alcohol to form a mixed solution, mixing the mixed solution with tungsten powder, carrying out ball milling, and drying the ball-milled mixture to remove alcohol; the dried mixture is subjected to crushing, grinding, sieving and hydraulic forming treatment, and a blocky tungsten powder mixture is obtained; the blocky tungsten powder mixture is subjected to degreasing treatment in the hydrogen atmosphere; and the degreased blocky mixture is subjected to sintering treatment. According to the method, simple, low-cost and controllable-performance preparation of the high-performance porous tungsten is achieved, and the requirements of various application scenes are met.

The invention relates to the field of refractory materials, in particular to a high-erosion-resistance refractory material based on boron nitride modification and a preparation method of the high-erosion-resistance refractory material. The problem that an existing refractory material is poor in erosion resistance is solved. The refractory material is prepared by taking zirconium dioxide, silicon dioxide, calcium oxide, ferric oxide and aluminum oxide as matrixes and adding samarium lanthanum magnesium aluminum composite gel powder and boron nitride loaded chromium sesquioxide, magnesium nitrate, aluminum nitrate, samarium nitrate, lanthanum nitrate and citric acid form gel, high-temperature treatment is performed to obtain the samarium lanthanum magnesium aluminum composite gel powder, and the samarium lanthanum magnesium aluminum composite gel powder is added to the boron nitride loaded chromium sesquioxide. Boron nitride is loaded with chromium sesquioxide after being treated by tannic acid, the corrosion resistance of the material is enhanced through the synergistic effect of all the components, and the material is suitable for high-temperature furnaces, high-temperature reactors and other industrial environments needing high-temperature resistance and high corrosion resistance.

The invention relates to an ethylene glycol regulated rare earth europium doped Sr2LaF7 nano material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, dissolving strontium chloride, lanthanum nitrate and europium nitrate in water to form a uniform solution; then adding ethylene glycol accounting for 20-70% of the volume of the deionized water, and regulating crystal growth by utilizing coordination of the ethylene glycol and metal ions; adding an ammonium fluoride or sodium fluoride solution, adjusting the pH value, and carrying out a hydrothermal reaction at 100-180 DEG C for 4-12 h; and finally, centrifuging, washing and drying to obtain a final product. Compared with the prior art, the morphology-controllable preparation of the Sr2LaF7 nano material is realized through directional regulation and control of ethylene glycol and a simple hydrothermal method, and the product has the advantages of high luminous intensity, uniform morphology and the like, and has an application prospect in the fields of fluorescence labeling and the like; the method is simple in process and low in cost.

This invention relates to the field of galvanized steel wire technology, and proposes a high-strength galvanized steel wire and its preparation method. The preparation method of high-strength galvanized steel wire includes the following steps: activating the steel wire, then subjecting it to fluxing to obtain a pretreated steel wire; hot-dip galvanizing the pretreated steel wire, followed by passivation, to obtain high-strength galvanized steel wire; during fluxing, the flux consists of the following components by mass percentage: 20%~25% zinc chloride, 16%~20% ammonium chloride, 1.0%~2.0% additives, 1%~2% nickel chloride, 1%~2% lanthanum nitrate, 0.2%~0.5% ammonium bifluoride, with the balance being water; the additives are palmitamide propyl betaine and disodium lauryl sulfosuccinate. Through the above technical solution, the problem of insufficient wear resistance of galvanized steel wire in related technologies is solved.

The invention belongs to the field of engineering ceramic materials, and particularly relates to a preparation method of high-toughness microcrystalline alumina ceramic. According to the method, high-purity alumina powder, lanthanum nitrate hexahydrate and yttria-stabilized zirconia are used as raw materials, ethanol is used as a dispersion medium, and ball-milling mixing, low-temperature drying, pressure forming, high-temperature drying, normal-pressure sintering and other processes are performed to prepare the zirconia ceramic. The densification and performance optimization of the alumina ceramic are realized by reasonably regulating and controlling the raw material ratio and the heat treatment system and utilizing the grain size control effect of the lanthanum element and the pinning toughening effect of the yttrium-stabilized zirconia.

The invention discloses a manganese-lanthanum double-element gradient doped calcium-based desulfurizing agent and a preparation method thereof, and belongs to the technical field of flue gas purification. The method comprises the following steps: preparing a precursor, namely mixing calcium hydroxide, manganous nitrate and lanthanum nitrate, and preparing the precursor by adopting a sol-gel method; gradient doping control: calcining through temperature programming, and forming a gradient doping material by utilizing the diffusion rate difference of Mn < 2 + > and La < 3 + > ions; surface electron structure regulation and control: carrying out heat treatment on the gradient doped material in an inert atmosphere, replacing Ca < 2 + > with Mn < 2 + > to form oxygen vacancy, and improving electron mobility; la < 3 + > forms a La-O-Ca bond on the surface, so that the surface energy is reduced. The preparation method is efficient, the prepared desulfurizing agent has high activity and stability, acid gas in flue gas can be effectively removed, and the problems that an existing material is low in deacidification efficiency in a medium-high-temperature low-water environment and large in medium-low-temperature spraying fly ash amount are solved.

The invention relates to heat storage ceramic with high silicon blockage resistance and a preparation process of the heat storage ceramic. The heat storage ceramic comprises a ceramic matrix and lanthanum-praseodymium-titanium modified liquid for dipping the ceramic matrix, the preparation raw materials of the ceramic matrix comprise the following components in parts by weight: 35-45 parts of kaolin, 20-30 parts of alumina powder, 10-14 parts of silicon carbide powder and 5-8 parts of a fluxing agent; the lanthanum-praseodymium-titanium modified liquid is prepared from the following raw materials: lanthanum nitrate, praseodymium nitrate, nano titanium dioxide sol and water. The heat storage ceramic is low in initial adhesion silicon content, easy to clean and gt in crusting stripping rate; and the silicon plugging resistance is good.

A method for large-scale synthesis of calcium lanthanum sulfide (CLS) powders and the resulting optical-grade materials are disclosed. The CLS powders, including compositions such as CaLa2S4, CaLa2.0-2.7S4.0-5.05, and CaLa18S28, are produced via an aqueous combustion process utilizing lanthanum nitrate, calcium nitrate, and thioacetamide as a sulfur donor. The exothermic combustion step generates localized high temperatures, forming nanostructured CLS powders with uniform stoichiometry and phase purity without the need for prolonged calcination. The powders exhibit excellent sinterability and can be consolidated by hot isostatic pressing into windows, domes, and lenses with infrared transmittance exceeding 50% in the 8-14 μm range and high mechanical strength. The process is scalable, energy-efficient, and environmentally friendly, enabling cost-effective production of infrared optical components for missile and defense applications.

The application discloses a carbon deposition resistant nickel-based catalyst for a dry reforming reaction of methane and a preparation method of the catalyst, and the preparation method comprises the following steps: step one, mixing lanthanum nitrate hexahydrate, aluminum nitrate nonahydrate and glycine, and adding deionized water, and stirring until a transparent solution is formed; step two, evaporating the transparent solution to form a gel; step three, drying the gel, igniting, and calcining to obtain a fluffy powder; grinding the powder to obtain a modified alumina carrier; step four, loading nickel on the modified alumina carrier by taking nickel nitrate hexahydrate as a precursor, so as to obtain the carbon deposition resistant nickel-based catalyst for the dry reforming reaction of methane.

The invention relates to the field of photocatalysts, in particular to a lanthanum oxycarbonate-gallium oxide composite photocatalyst for catalytic reduction of carbon dioxide and a preparation method thereof.The preparation method comprises the following steps that S1, sodium carbonate, sodium fluoride and lanthanum nitrate hexahydrate are dissolved in deionized water and stirred and mixed at the room temperature, then a hydrothermal reaction is conducted, and a precursor is obtained; after cooling, filtering, washing and drying in sequence to obtain a sodium lanthanum carbonate precursor; s2, weighing gallium nitrate, mixing with the sodium lanthanum carbonate precursor, grinding, and uniformly mixing to obtain a composite precursor; and S3, in a protective atmosphere, carrying out temperature programming treatment on the composite precursor, and naturally cooling to room temperature to obtain the lanthanum oxycarbonate-gallium oxide composite photocatalyst. The photocatalytic CO2 reduction performance of the composite photocatalyst prepared by the invention is superior to that of single lanthanum oxycarbonate and gallium oxide catalysts, and the composite photocatalyst shows excellent application potential.

The application discloses a method for preparing an iron-based catalyst by using iron-oxidizing microorganisms and application of the iron-based catalyst. The method for preparing the iron-based catalyst comprises the following steps: adding CaO into animal manure, adjusting pH, drying, and sieving; configuring an impregnation liquid, inoculating iron-oxidizing microorganisms with a volume ratio of 3%-5% into the impregnation liquid, and culturing until the content of ferrous ions in the impregnation liquid is lower than 0.1 g / L, that is, the culture is complete, and then adding lanthanum nitrate into the impregnation liquid; adding the animal manure into the impregnation liquid, the height of the impregnation liquid being higher than that of the animal manure, stirring for a period of time, and fixing the iron-based catalyst on the carrier of the animal manure; and performing solid-liquid separation on the fixed iron-based catalyst, drying the separated precipitate, and obtaining the finished iron-based catalyst. The preparation method simplifies the preparation process, reduces the production cost, is an environment-friendly preparation method of the catalyst, and has remarkable industrial application value and wide popularization prospect.

The invention relates to the technical field of preparation of novel coatings, in particular to a sun-proof red pigment for a high-heat-resistance coating and a preparation process of the sun-proof red pigment, and the sun-proof red pigment comprises the following raw materials: modified 2B acid, modified 2, 3 acid, modified lanthanum nitrate, a precipitator and rosin. According to the invention, the modified 2B acid is subjected to surface coating treatment, so that the thermal stability of the modified 2B acid and the dispersity of the modified 2B acid in a reaction system are enhanced; the modified 2, 3 acid is subjected to molecular activation treatment, so that the reaction activity and the coupling efficiency are improved; the modified lanthanum nitrate is subjected to surface modification, so that the compatibility and complexing ability of the modified lanthanum nitrate in an organic phase are enhanced; the modified lanthanum nitrate can be more sufficiently and stably coordinated and complexed with the activated 2, 3 acid and the wrapped 2B acid derivative, so that a pigment molecule color development system is more compact and stable, and the pigment is more heat-resistant and sun-proof on the whole.

The application discloses a preparation method of a nanoscale multi-metal catalyst, which comprises the following steps: mixing ferric nitrate, magnesium nitrate, lanthanum nitrate, gadolinium nitrate, ammonium heptamolybdate and citric acid with water to obtain a concentrated solution by heating and concentrating; mixing ethylenediaminetetraacetic acid, ammonia water and urea to obtain an ethylenediaminetetraacetic acid solution; mixing the concentrated solution and the ethylenediaminetetraacetic acid solution to obtain a mixed solution by stirring, adding a surfactant into the mixed solution and calcining, and finally roasting. The ferric nitrate, the magnesium nitrate, the lanthanum nitrate and the gadolinium nitrate are mixed, a complexing agent is added, a solution is prepared by using a complexing method, the solution is concentrated, calcined and sieved, and finally the nanoscale multi-metal catalyst is formed. The catalyst prepared by the method has a uniform particle size. The catalyst prepared by the method is combined with a plasma technology to prepare a single-walled carbon nanotube, and the single-walled carbon nanotube (without treatment) has a high ratio, a large IG / ID and a small powder resistance.

The invention relates to a preparation method of an aluminum-doped lithium lanthanum zirconium oxide solid electrolyte, and belongs to the technical field of solid electrolyte materials. Adding lithium carbonate, lanthanum oxide, zirconium oxide, aluminum nitrate and absolute ethyl alcohol into a ball milling tank for ball milling, drying, adding the modified aluminum ion chelating agent, mixing, grinding, sieving, putting into an aluminum oxide crucible, and pre-sintering to obtain an LLZO precursor; grinding and sieving the LLZO precursor, adding a polyvinyl alcohol solution, mixing, and pressing into a wafer; and placing the wafer in an alumina crucible, and carrying out high-temperature sintering to obtain the lithium lanthanum zirconium oxide solid electrolyte doped with the aluminum element. The modified aluminum ion chelating agent is prepared from (11-mercaptoundecyl)-trimethyl ammonium bromide, methylbenzene, biphenyl-4, 4 '-dithiol, triethylamine, lanthanum nitrate and stannous octoate; the lithium lanthanum zirconium oxide solid electrolyte prepared by the invention has relatively high room-temperature ionic conductivity and excellent chemical stability and interface stability.

The invention relates to the technical field of catalysts, and discloses a catalyst for reducing the sulfur content of petroleum coke and a preparation method thereof.Sodium phytate containing multiple phosphate groups is used for replacing part of sodium phosphate salt, sodium tungstate, ammonium molybdate and lanthanum nitrate are subjected to a reaction, and obtained rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid contains more anions; the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid and the citric acid quaternary ammonium salt containing a plurality of quaternary ammonium salt cations form stronger electrostatic interaction, and meanwhile, the citric acid quaternary ammonium salt contains a plurality of hydroxyl groups and can form hydrogen-bond interaction with the surface of the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid, so that the surface modification of the citric acid quaternary ammonium salt on the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid is effectively realized; after modification, the dispersity of the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid is improved, agglomeration is reduced, more catalytic active sites are achieved, the contact area between the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid and petroleum coke is increased, and sulfur-containing compounds such as thiophenic sulfur and the like which are difficult to degrade in the petroleum coke are efficiently oxidized and removed through synergistic oxidation catalysis with hydrogen peroxide.

This invention relates to a lanthanum-based composite phosphorus removal material and its preparation and removal methods, belonging to the field of water treatment. It solves at least one of the following problems existing in lanthanum-based phosphorus removal materials: the difficulty in balancing high adsorption capacity and structural stability, the difficulty in balancing excellent adsorption performance and simple preparation processes, and the difficulty in synergistically achieving high phosphorus removal efficiency and easy material recycling and regeneration. A method for preparing a lanthanum-based composite phosphorus removal material, using lanthanum nitrate hexahydrate and citric acid as the lanthanum source and carbon source respectively, includes the following steps: co-dissolving lanthanum nitrate hexahydrate and citric acid in water; stirring and mixing under heating conditions until a viscous liquid is formed; calcining the viscous liquid; and grinding the calcined product. This invention achieves high adsorption capacity, high selectivity, and rapid adsorption of phosphates in water, with stable structure, reduced production costs and process complexity, and excellent recycling and regeneration capabilities.

The invention relates to the technical field of nickel alloys, in particular to a preparation method of a high-thermal-conductivity and high-strength nickel-based alloy, which comprises the following steps: S1, mixing nickel powder, chromium powder, molybdenum powder, tungsten powder, carbon powder and boron powder, carrying out ball milling for 2-3 hours under the protection of argon, adding aluminum powder, titanium powder, cobalt powder, lanthanum nitrate and composite powder, and stirring for 1-2 hours at 300rpm to obtain alloy powder; s2, the alloy powder is subjected to vacuum melting at 1550 DEG C for 45 min and then poured into an aluminum oxide mold shell preheated to 1000 DEG C, and a liquid metal cooling method is adopted to obtain an alloy crude product; and S3, the alloy crude product is subjected to solid solution, cryogenic treatment, aging treatment and surface treatment, and the high-heat-conductivity and high-strength nickel-based alloy is obtained. According to the invention, the stacking fault energy of the alloy can be reduced, the grain boundary plasticity is improved, the brittle fracture trend is relieved, the low-temperature brittleness of the alloy is inhibited, and the fracture problem is avoided.

This invention discloses a fluoride-containing wastewater treatment agent and its preparation method. The preparation method includes the following steps: adding mesoporous silica and lanthanum nitrate solution respectively, reacting in a water bath at 80-90℃, and then activating the modified mesoporous silica at 500-550℃ in an air atmosphere to obtain modified mesoporous silica. The modified silica is then immersed in a sodium alginate mixture and homogenized by ultrasonication in an ice bath at 300-350W. Next, it is sequentially immersed in a calcium chloride solution and a chitosan mixture, and then shaken at room temperature to obtain gel microspheres. A dopamine solution is pre-saturated in an air atmosphere, and then the gel microspheres are added. The mixture is then shaken at 120 times / min in the dark at room temperature to obtain polydopamine-coated microcapsules. The activated microcapsules are then immersed in a carboxybetaine grafting solution and shaken in a water bath at 50-55℃ under nitrogen protection to obtain the fluoride-containing wastewater treatment agent. This results in a fluoride-containing wastewater treatment agent with high adsorption efficiency, easy recycling, and long service life.

The invention discloses a sponge-based defluorination composite material as well as a preparation method and application thereof. The sponge-based defluorination composite material comprises sponge serving as a carrier and metal salt loaded on the sponge, the metal salt comprises iron metal salt, aluminum metal salt and lanthanum metal salt; the iron metal salt is ferric sulfate or ferric chloride, the aluminum metal salt is aluminum chloride, and the lanthanum metal salt is lanthanum chloride or lanthanum nitrate. Compared with other adsorption type defluorination materials, the sponge-based defluorination composite material disclosed by the invention is low in cost, convenient to use and capable of being repeatedly used for many times; meanwhile, the sponge-based defluorination composite material is high in defluorination efficiency and stable in performance, and has remarkable application advantages.

The present application relates to the technical field of catalysts, in particular to a preparation method of a rare earth catalyst for petroleum cracking. The preparation method first forms a stable ternary complex solution by reacting lanthanum nitrate and cerium nitrate with bidentate ligand and functional ionic liquid after dissolution; then the solution is mixed with silica-alumina gel formed by a template agent, a silicon source, an aluminum source and a mineralizer, and the catalyst is prepared through hydrothermal crystallization, programmed temperature calcination and other steps. The preparation method realizes the highly uniform dispersion and stable combination of rare earth elements in the molecular sieve carrier through the coordination and hydrogen bond anchoring synergistic effect. The prepared catalyst shows high heavy oil conversion rate, high low-carbon olefin selectivity, excellent hydrothermal stability, outstanding anti-coking and anti-metal poisoning capacity in the petroleum cracking reaction, and has performance advantages and industrial application economy, and is suitable for large-scale petroleum cracking production scenarios.

The application provides a preparation method of silica-stabilized lanthanum zirconate aerogel, and comprises the following steps: using lanthanum nitrate hexahydrate and zirconium nitrate pentahydrate as precursors, and using propylene oxide as a catalyst to obtain an LZ sol in anhydrous ethanol solvent; using tetraethyl orthosilicate as a precursor, and using hydrochloric acid as a catalyst to carry out hydrolysis in an ethanol and water solvent to obtain an SiO2 sol; dropping the obtained SiO2 sol into the LZ sol drop by drop to obtain a mixed solution, and dropping the mixed solution into propylene oxide gel promoter drop by drop to obtain an LZS sol; the LZS sol is placed in an oven to obtain an LZS gel; and the LZS gel is subjected to aging and supercritical drying to obtain a blocky LZS aerogel. The silica-stabilized lanthanum zirconate aerogel has a unique pyrochlore structure and good thermal stability, and has a very large application prospect in the field of heat preservation and insulation.

The application relates to a low-temperature high-rate graphite negative electrode material and a preparation method thereof, and belongs to the technical field of high polymer materials. The low-temperature high-rate graphite negative electrode material comprises, in terms of weight parts, 25-35 parts of graphite, 1-2 parts of molybdenum disulfide, 0.8-1.2 parts of carbon black, 3-5 parts of nano titanium nitride, 3-5 parts of a low-temperature resistant modifier, 1-3 parts of butadiene styrene rubber emulsion, 1-5 parts of deionized water and 15-25 parts of N-methyl pyrrolidone. A compound is obtained by reacting a precursor prepared from lanthanum nitrate hexahydrate, barium nitrate and graphite powder with lithium fluoride, a pre-product is obtained by reacting the hydroxyl group of the compound with a silane hydrolysis product, and finally, the low-temperature resistant modifier is obtained by reacting the amino group of the pre-product with the double bond of a siloxane chain, the internal resistance is reduced, a gradient conductive network is formed, the volume change is buffered, and the rate performance of the negative electrode material is improved. The low-temperature high-rate graphite negative electrode material prepared by the application not only has good low-temperature resistance, but also has excellent high-rate performance and cycle stability.

The invention discloses a zinc battery positive electrode material, a preparation method and application thereof, and the preparation method comprises the following steps: dissolving vanadium pentoxide, oxalic acid hydrate, lanthanum nitrate hydrate and hydrogen peroxide in a solvent to obtain a mixed solution, transferring the mixed solution to a hydrothermal kettle for heating reaction, separating and washing a solid product to obtain the zinc battery positive electrode material. A one-pot hydrothermal synthesis preparation process is adopted, the process conditions are mild and controllable, raw materials are easy to obtain, the cost is controllable, complex and precise instruments are not needed, the equipment investment is low, the process steps are simple, and continuous large-scale production is easy to achieve.

The present invention relates to the technical field of anti-icing materials, and in particular to a manganese ferrite magnetic nanoparticle, preparation method and application thereof. The manganese ferrite magnetic nanoparticle prepared by the present invention is LaxCaySrzMnO3, wherein X=0.1-0.7, Y=0.1-0.35, and Z=0-0.16; and is prepared from the following materials, comprising, in parts by weight: 10-70 parts of lanthanum nitrate, 10-35 parts of calcium nitrate, 2-10 parts of strontium nitrate, and 30-50 parts of manganese nitrate.

The invention relates to the technical field of molecular sieve preparation, and particularly discloses a modified molecular sieve catalyst and a preparation method thereof. The modified molecular sieve catalyst comprises the following raw materials: 8-12 g of a modified NaY molecular sieve and 1-5 ml of a lanthanum nitrate solution, the modified NaY molecular sieve contains a nitrogen element, and the nitrogen element is modified melamine; the preparation method comprises the following steps: uniformly mixing 8-12g of modified NaY molecular sieve and 1-5ml of lanthanum nitrate solution, and stirring at 75-85 DEG C for 7-9 hours at the rotating speed of 450-550r / min; after stirring is completed, the mixture is transferred to a centrifugal machine, the rotating speed ranges from 4000 r / min to 4400 r / min, the primary centrifugation time ranges from 1 min to 3 min, washing is conducted till the solution conductivity ranges from 450 microseconds to 500 microseconds, the mixture is put into a drying oven to be dried for 7 h to 9 h at the temperature of 100 DEG C to 140 DEG C, then roasting is conducted at the temperature of 550 DEG C to 650 DEG C, and the modified molecular sieve catalyst is obtained. The modified molecular sieve catalyst has the advantage that the defect that the activity of the molecular sieve catalyst is still insufficient can be overcome.