182 results about "Lanthanum nitrate" patented technology

The invention belongs to the technical field of heating bodies, and particularly relates to a method for preparing a sheet-shaped heating body. The preparation method comprises the following steps: stirring and dissolving lanthanum nitrate, strontium nitrate, manganese nitrate hexahydrate and a solvent to obtain a metal salt solution; preparing the metal salt solution into a precursor, wherein the precursor is a precursor solution or precursor sol; and carrying out tape casting and drying on the precursor to obtain a biscuit sheet, and carrying out glue removal treatment and sintering on the biscuit sheet to obtain the sheet-shaped heating body. According to the preparation method, a precursor system is optimized, the dispersion stability of the precursor is improved, casting, drying and sintering processes are matched, the problem of powder agglomeration is solved, the defects of green bodies are reduced, the drying shrinkage rate of green body pieces in the preparation process is reduced, the surface roughness is reduced, the stability and heat output uniformity of a heating body are improved, and the compactness is improved.

The invention relates to the technical field of alloys, and discloses a high-strength silver-copper alloy and a preparation method thereof. The acidified carbon nanotubes are subjected to functional modification, methylbenzene-2, 4-diisocyanate reacts with surface active groups of the methylbenzene-2, 4-diisocyanate to introduce-NCO groups, then through hydroxyl reaction of-NCO and 4-hydroxyphthalic acid, a plurality of carboxyl groups are grafted on the surfaces of the carbon nanotubes, the carboxyl groups can firmly adsorb lanthanum nitrate through a coordination effect, and meanwhile, the carboxyl groups can also adsorb lanthanum nitrate through a coordination effect. The rare earth elements are prevented from being separated from the raw materials in the ball milling process, uniform distribution is ensured, the agglomeration tendency of the carbon nanotubes can be reduced, and the dispersity of the carbon nanotubes in the silver-copper alloy is improved; the carbon nanotubes have extremely high axial strength and excellent conductivity, the mechanical and electrical properties of the alloy material can be enhanced through load transfer and a conductive network effect, rare earth lanthanum is segregated at a grain boundary to form a pinning effect to refine grains, the alloy strength is further improved, and finally collaborative improvement of the strength and the conductivity of the silver-copper alloy is achieved.

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 catalyst for preparing trichlorosilane and a catalytic preparation method of trichlorosilane. The catalyst is prepared from the following components in percentage by mass: weighed copper nitrate, zinc nitrate, aluminum nitrate, lanthanum nitrate and the balance of a carrier, the preparation method comprises the following specific steps: S1, filling a catalyst; S2, purifying raw material gas; S3, reacting; and S4, separating and purifying a product, namely discharging a reacted gas product from an outlet of a reactor, and condensing through a condenser. In the prepared catalyst, the activity and selectivity of the catalyst are remarkably improved through the synergistic effect of the copper-zinc-aluminum composite oxide and the rare earth element lanthanum, the electronic structure and the surface acid-base property of the catalyst can be adjusted through doping of lanthanum, the reaction of silicon powder and hydrogen chloride is promoted, meanwhile, side reactions are inhibited, and the service life of the catalyst is prolonged. And the yield of trichlorosilane is improved.

The invention relates to the technical field of anti-corrosion treatment, and provides anti-corrosion molding powder and a radiator anti-corrosion treatment technology.The anti-corrosion molding powder is prepared by taking polyethylene glycol terephthalate as a matrix and cooperating with a TGIC curing agent, phosphoric acid activated bamboo charcoal nanofibers, graphene modified zinc oxide, a lanthanum nitrate and cerous nitrate compound, a silane coupling agent and a functional additive; a composite resin system with a compact nano-structure is prepared through high-speed ball milling pre-activation and a twin-screw gradient extrusion process. The treatment process of the radiator comprises the steps of forming the ceramic substrate layer through micro-arc oxidation, performing dynamic temperature control impregnation with acrylic acid water-based paint, spraying anti-corrosion molding powder, performing microwave infrared gradient curing, and constructing a metal substrate-ceramic layer-organic coating multi-stage protection system. The permeability resistance of the coating is remarkably improved, a continuous and compact composite protection structure is formed, the problems of interface stripping, medium permeation and poor environmental adaptability of a traditional coating are solved, and the coating is suitable for the long-acting anti-corrosion requirement of the radiator under the high-corrosion working condition.

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 invention discloses a high-entropy perovskite oxide, a preparation method thereof and application of the high-entropy perovskite oxide as an electrocatalyst, and belongs to the technical field of high-entropy transition metal oxides. A sol-gel method is adopted, various metal nitrates and lanthanum nitrate are dissolved in water and ethylene glycol in an equimolar mode, and an ammonium citrate complexing agent is added. And then heating at 120 DEG C for 10 hours. And heating the obtained gel precursor to 600 DEG C in a muffle furnace at a heating rate of 10 DEG C / min, maintaining the temperature for 2 hours, and cooling to obtain the high-entropy perovskite oxide LaBxO3. The high-entropy perovskite oxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, and the electrocatalyst can be applied to electrocatalytic nitrate radical reduction and sulfur ion oxidation; and a foundation is laid for developing other high-entropy transition metal oxides as electrocatalysts for synthesizing value-added chemicals by electrocatalyzing nitrate radicals and sulfur-containing wastewater.

The invention relates to the technical field of catalysts, and particularly discloses a Ni-Cu-CeO2 / ZrO catalyst for improving oxidation stability of biodiesel and a preparation method of the Ni-Cu-CeO2 / ZrO catalyst. The invention discloses a Ni-Cu-CeO2 / ZrO catalyst for improving oxidation stability of biodiesel. The Ni-Cu-CeO2 / ZrO catalyst comprises a carrier, an active component and an auxiliary agent, the carrier is a CeO2-ZrO2 composite oxide; the active components are Ni and Cu; ni accounts for 3-5 wt% of the mass of the catalyst, and Cu accounts for 1-3 wt% of the mass of the catalyst; the auxiliary agent is La2O3; the preparation method comprises the following steps: firstly preparing the CeO2-ZrO2 carrier by adopting a coprecipitation method, then impregnating nickel nitrate, copper nitrate and lanthanum nitrate in an isopyknic manner, and then carrying out stepped roasting to obtain the catalyst. The catalyst has high catalytic activity and stability, unsaturated fatty acid ester in biodiesel can be removed, the oxidation stability of the biodiesel is improved, and the cost of the catalyst is lower than that of a noble metal catalyst.

The invention belongs to the technical field of auxiliary preparation, and provides a curing material applied to a flameless combustion process of copper-containing sludge and a preparation method. The preparation method comprises the following steps: firstly, mixing iron nitrate nonahydrate, ferrous sulfate heptahydrate, a manganous nitrate solution and citric acid to prepare a ferrite precursor; further, a rare earth phosphate nano dispersion is synthesized through a hydrothermal method, lanthanum nitrate hexahydrate and cerium nitrate hexahydrate are used as rare earth sources, and ammonium dihydrogen phosphate and ammonium fluoride are introduced to provide phosphate radicals and fluorine ions; meanwhile, multi-element co-doped amorphous powder is prepared through a sol-gel method, tetraethoxysilane serves as a silicon source, zirconium oxychloride octahydrate, tetra-n-butyl titanate and niobium pentachloride are supplemented, a thermally stable amorphous oxide matrix is formed under high-temperature heat treatment, and the high-temperature mechanical property is provided; and finally, mixing kaolin or bentonite mineral powder with the synthesized ferrite precursor, the rare earth phosphate nano dispersion, the multi-element amorphous powder and other auxiliaries to form slurry, and drying to form the curing material.

The invention relates to a continuous casting-continuous extrusion short-process forming process for a large-width copper plate strip, and belongs to the technical field of metal processing. The method comprises the following steps: preheating and drying high-purity cathode copper, melting in a smelting device, covering the surface of molten copper with charcoal and graphite flakes, carrying out on-line degassing, deoxidizing and stirring, upwards leading a copper rod by adopting a traction unit, and extruding between an extrusion wheel and a compaction wheel; a four-high rolling mill is used for rolling; cleaning and passivating the annealed copper plate strip, spraying a lanthanum (III)-containing silane-benzimidazole lubricant solution on the surface of the copper plate strip, and drying; slitting to obtain a large-width copper plate strip; the lanthanum (III)-silane-benzimidazole lubricant is prepared from vinyltriethoxysilane, deionized water, ethanol, benzimidazole and lanthanum nitrate hexahydrate (III), and the lanthanum (III)-silane-benzimidazole lubricant is prepared from the vinyltriethoxysilane, the deionized water, the ethanol, the benzimidazole and the lanthanum nitrate hexahydrate (III); the prepared copper plate strip is high in purity, low in oxygen content, high in conductivity and excellent in mechanical property, and the technical requirements of the high-end field for the high-purity high-conductivity oxygen-free copper plate strip are met.

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 belongs to the technical field of auxiliary agent preparation, and provides a solidified material applied to copper-containing sludge flameless combustion process and a preparation method; firstly, iron nitrate nonahydrate, ferrous sulfate heptahydrate, manganese nitrate solution and citric acid are mixed to prepare ferrite precursor; further, rare earth phosphate nanodispersion is synthesized by a hydrothermal method, lanthanum nitrate hexahydrate and cerium nitrate hexahydrate are used as rare earth sources, ammonium dihydrogen phosphate and ammonium fluoride are introduced to provide phosphate and fluoride ions; meanwhile, multi-component co-doped amorphous powder is prepared by a sol-gel method, tetraethyl orthosilicate is used as a silicon source, zirconium oxychloride octahydrate, titanium acid tetrabutyl ester and niobium pentachloride are used as auxiliary materials, and a thermally stable amorphous oxide matrix is formed under high-temperature heat treatment to provide high-temperature mechanical properties; finally, kaolin or bentonite mineral powder is mixed with the above-synthesized ferrite precursor, rare earth phosphate nanodispersion, multi-component amorphous powder and other auxiliary agents, a slurry is formed, and the slurry is dried and formed into a solidified material.

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 relates to the technical field of hydrogen production through water electrolysis, and provides a lanthanum-doped and boron-modified ferronickel oxide (oxyhydrogen) self-supporting nano catalytic material and electro-catalysis application of the material by utilizing a simple, convenient and industrially compatible liquid-phase synthesis method and an electro-deposition strategy. According to the self-supporting material, commercial foam iron is used as a substrate, a sodium borohydride solution is used as a treatment solution, a sample is taken out after being soaked at low temperature, and the boron-modified ferrite (oxyhydrogen) self-supporting nano catalytic material is obtained after aftertreatment. Then, a mixed solution of nickel nitrate, ferric nitrate and lanthanum nitrate is used as an electrolyte, the boron-modified ferrite (oxyhydrogen) self-supporting nano catalytic material is used as an anode under the configuration of standard three electrodes, the boron-modified ferrite (oxyhydrogen) self-supporting nano catalytic material is treated through an i-t technology (the constant voltage is-1V vs.Hg / HgO), and a final sample is obtained through post-treatment. According to the innovative technology, the cheap commercial metal foam substrate can be quickly and simply converted into the high-activity and high-stability oxygen evolution catalyst. The self-supporting catalytic material not only has excellent oxygen evolution reaction (OER), but also is simple in preparation process (high temperature and high pressure are avoided, and complicated equipment is not needed), and is suitable for industrial large-scale preparation and application.

The application discloses a lead lanthanum zirconium tin-based antiferroelectric film prepared through doping regulation, a preparation method and application thereof, and relates to the technical field of antiferroelectric films. The lead lanthanum zirconium tin-based antiferroelectric film is prepared through the following steps. First, a mixed solution is prepared by mixing lead acetate trihydrate, dibutyl tin diacetate, lanthanum nitrate hexahydrate, manganese acetate tetrahydrate and glacial acetic acid. Then, the mixed solution is heated and stirred and cooled. Subsequently, polyethylene glycol and acetylacetone are added in sequence and stirred at room temperature. Then, zirconium n-propylate, ethylene glycol methyl ether and deionized water are added and stirred at room temperature. Finally, lactic acid is added and stirred at room temperature. After standing, a precursor solution is obtained through filtration. The precursor solution is prepared on a Pt(111) / Ti / SiO2 / Si(004) substrate through spin coating. Then, the precursor solution is subjected to drying treatment and pyrolysis treatment. The thin film of the first layer and the tenth layer is subjected to annealing treatment in an air atmosphere, so that the lead lanthanum zirconium tin-based antiferroelectric film is obtained. While realizing a larger refrigeration temperature change value, the electric refrigerator refrigeration effect is also expanded to a low-temperature region, and the antiferroelectric performance is more excellent.

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 the technical field of anodic oxidation treatment, and discloses an anodic oxidation normal-temperature and high-temperature sealing treatment agent, the sealing treatment agent comprises a normal-temperature treatment agent and a high-temperature treatment agent, each liter of normal-temperature sealing liquid is composed of 1-3 g of nickel fluoride, 5-8 g of potassium sodium tartrate tetrahydrate, 10-15 mL of boehmite sol and 0.05-0.2 g of SrTiO3 / BPQDs heterojunction catalyst; each liter of the high-temperature confining liquid is composed of 3-8 g of lanthanum nitrate, 5-15 g of aluminum citrate, 0.1-1 g of PNIPAM, 0.4 g of PNIPAM and 1-3 g of boric acid. According to the invention, a compact composite film layer can be finally obtained.

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 application relates to the alloy technical field and discloses a high-strength silver-copper alloy and a preparation method. Acidified carbon nanotubes are functionally modified, -NCO groups are introduced by reacting toluene-2,4-diisocyanate with surface active groups, and a plurality of carboxyl groups are grafted on the surface of the carbon nanotubes by reacting the -NCO groups with the hydroxyl groups of 4-hydroxyphthalic acid. The carboxyl groups can firmly adsorb lanthanum nitrate through coordination, avoid the separation of rare earth elements in the ball milling process with raw materials, ensure the uniform distribution, reduce the carbon nanotube agglomeration tendency, and improve the dispersity of the carbon nanotubes in the silver-copper alloy. The carbon nanotubes have extremely high axial strength and excellent conductivity, the load transmission and the conductive network effect can enhance the mechanical and electrical properties of the alloy material, the rare earth lanthanum is segregated at the grain boundary to form a pinning effect to refine the grains, the alloy strength is further improved, and the strength and the conductivity of the silver-copper alloy are synergistically improved.

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 chromium-free passivator for aluminum and aluminum alloy and a preparation method of the chromium-free passivator. The chromium-free passivator comprises the following components: 2.0 to 5.0 g / L of cerium nitrate, 1.0 to 3.0 g / L of lanthanum nitrate, 0.5 to 2.0 g / L of yttrium nitrate, 1.0 to 3.0 g / L of fluorosilane modified nano SiO2, 0.5 to 1.5 g / L of a chelating titanate coupling agent, 3.0 to 8.5 g / L of citric acid, 1.0 to 3.0 mL / L of 30% hydrogen peroxide, 0.5 to 2.0 g / L of potassium fluozirconate, 1.0 to 5.0 mL / L of an amino silane coupling agent, 0.01 to 3.0 mL / L of a pH regulator and the balance of deionized water. The chromium-free passivating agent has high adhesive force and excellent hydrophobicity, is free of corrosion under neutral salt mist for 500 h, can resist copper accelerated acetate mist for 120 h or above, and meets the industrial requirement for surface treatment of aluminum alloy products.

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 relates to a preparation method of a high-temperature-resistant high-space-velocity VOCs catalytic combustion catalyst for acid ester waste gas and the catalyst, and belongs to the field of industrial waste gas treatment. The catalyst takes noble metal, transition metal oxide and rare earth oxide as active components, takes honeycomb ceramic or metal honeycomb as a carrier, and is prepared by adopting a coating process. First, Ce x Zr 0.6‑x La y Pr 0.1‑ y O2 is prepared by using lanthanum nitrate hexahydrate, praseodymium nitrate hexahydrate, cerium nitrate hexahydrate and zirconium nitrate pentahydrate; then, La-Al2O3 is prepared by using lanthanum nitrate hexahydrate and Al2O3 through an equal-volume impregnation method; and finally, the catalyst is prepared by using Ce x Zr 0.6‑x La y Pr 0.1‑ y O2, La-Al2O3 and noble metal. The catalyst has the characteristics of high low-temperature activity, good thermal stability and high purification efficiency for catalytic combustion of volatile organic compounds of acid esters at high space velocity.

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 discloses a catalytic synthesis method of methyl nitrite, belongs to the technical field of methyl nitrite synthesis, and is used for solving the technical problem that the selectivity of catalytic synthesis of methyl nitrite in the prior art needs to be further improved. The catalytic synthesis method specifically comprises the following steps: adding lanthanum nitrate, copper nitrate, palladium chloride and deionized water into a beaker; the preparation method comprises the following steps: adding amino graphene and aluminum silica gel into a reaction kettle, stirring at room temperature for 10-20 minutes, adding ethylene glycol, continuously stirring for 15-30 minutes, adding a composite carrier into a system, adjusting the pH value to 3-4 by using saturated dilute nitric acid, heating to 50 DEG C, reacting for 12-15 hours, and performing post-treatment to obtain the modified catalyst. The reaction conversion rate, selectivity and catalyst stability are improved.