754 results about "Lanthanum" patented technology

The invention relates to the field of anticorrosive paint, in particular to anticorrosive paint containing lanthanum cerium oxide and a preparation method of the anticorrosive paint. The invention relates to an anticorrosive coating containing lanthanum cerium oxide. The anticorrosive coating is prepared from the following raw materials: 28 to 45 parts of ultraviolet stable composite film forming matter, 5 to 10 parts of composite rare earth filler, 6 to 12 parts of supported synergistic antirust agent, 18 to 30 parts of mixed solvent, 0.8 to 2.5 parts of dispersing agent, 2.7 to 5.3 parts of functional additive and 0.5 to 1.2 parts of nano montmorillonite, the composite rare earth filler is lanthanum cerium oxide-hydroxyapatite composite powder with a core-shell structure, wherein lanthanum cerium oxide is used as a core, hydroxyapatite is used as a shell, and the thickness of the shell layer is 10-20 nm; the ultraviolet stable composite film forming substance comprises epoxy resin and ultraviolet grafting modified polyurethane in a weight ratio of 1: (0.6-2.2); the supported synergistic antirust agent is a mixture of mesoporous silica supported benzotriazole and zinc molybdate. And the obtained coating is high in adhesive force and long in service life.

The invention provides an anti-ferroelectric lanthanum ferrite, bismuth ferrite and strontium titanate superlattice film with high energy storage density as well as a preparation method and application thereof. The anti-ferroelectric lanthanum ferrite, bismuth ferrite and strontium titanate superlattice film with high energy storage density comprises a substrate layer, a bottom electrode layer and a plurality of stacked relaxation ferroelectric layers, wherein the bottom electrode layer and the multiple stacked relaxation ferroelectric layers are sequentially arranged on the substrate layer; each relaxor ferroelectric layer sequentially comprises a first functional layer, a second functional layer and a third functional layer from bottom to top; the first functional layer comprises LaFeO3, the second functional layer comprises BiFeO3, and the third functional layer comprises SrTiO3. The anti-ferroelectric lanthanum ferrite, bismuth ferrite and strontium titanate superlattice thin film with the high energy storage density has small electric leakage performance and high polarization value, and more excellent energy storage performance is achieved.

The present application provides an entropy-regulated composite dielectric film, which comprises a polymer matrix; and fillers dispersed in the polymer matrix, wherein the fillers comprise Bi 4‑a M 1a Ti (3‑3b) M 2b O 12 , wherein M1 comprises at least one of lanthanum, neodymium, samarium and praseodymium, M2 comprises at least one of zirconium, hafnium and tin, 0 The entropy-regulated composite dielectric film has high temperature resistance, high breakdown strength, high polarization strength, high energy storage density and good stability.

The invention provides a low-cost high-specific-surface-area cerium-aluminum composite oxide, a preparation method and application thereof, and relates to the technical field of catalysts, the preparation method comprises the following steps: step S1, adding 10-40% of cerium salt, 50-90% of aluminum salt and 0-10% of lanthanum source or zirconium source into deionized water, stirring and mixing, filtering, and washing to be neutral to obtain a cerium-containing solution; step S2, impregnating an alumina carrier in the cerium-containing solution prepared in the step S1, and standing to enable the cerium-containing solution to be impregnated on the alumina carrier, so as to obtain impregnated slurry; and S3, drying the dipping slurry, and then roasting in an inert atmosphere to obtain the cerium-aluminum composite oxide. The stable cerium-aluminum composite material is formed by doping one of lanthanum and zirconium with different masses into aluminum oxide or cerium oxide, the problem that the adsorption capacity of a traditional ammonia trapping method is limited is effectively solved, and the adsorption capacity of the material to ammonia is remarkably improved.

The method comprises the following steps: weighing an oxide precursor of metal indium, an oxide precursor of metal M, an ammonium salt and a lithium salt according to a chemical formula of indium-based halide, fully mixing, and calcining in an inert atmosphere to obtain the indium-based halide solid electrolyte. Forming an indium-based halide solid electrolyte through a solid-phase reaction; wherein M is selected from at least one of magnesium, calcium, strontium, barium, aluminum, gallium, indium, bismuth, scandium, yttrium, zinc, germanium, tin, lanthanum, cerium, samarium, gadolinium, holmium, erbium and ytterbium. The method can greatly simplify the synthesis process, reduce the raw material cost and realize industrial batch preparation.

A component for use in a semiconductor processing chamber is provided. A metal or metal alloy component body has a process-facing surface. An intermediate aluminum oxide coating is disposed on the process-facing surface, the intermediate aluminum oxide coating being at least 99% pure by weight and having a porosity of less than 0.1% by volume, the intermediate aluminum oxide coating having a first thickness. A process-exposed layer is disposed on the intermediate aluminum oxide coating, the process-exposed layer comprising at least one of yttrium, hafnium, zirconium, lanthanum, magnesium, and a lanthanide, the process-exposed layer being at least 99% pure by weight, having a porosity of less than 0.1%, and having a second thickness, the second thickness being less than or equal to the first thickness.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The invention belongs to the technical field of electrochemistry, and particularly provides a lanthanum-cerium double-doped sodium ferric sulfate positive electrode material and a preparation method thereof. The material is composed of a matrix and a carbon coating layer coating the matrix, the matrix has a chemical expression of Na6Fe4-x-yLaxCey (SO4) 7, x is greater than or equal to 0.01 and less than or equal to 0.1, and y is greater than or equal to 0.01 and less than or equal to 0.1. The material is prepared through spray drying and high-temperature sintering treatment in sequence, the particle morphology is regular, and the particle size distribution is uniform; the electronic conductivity and Na < + > diffusion rate of the material are remarkably improved by rare earth doping, so that the material has more excellent low-temperature cycle performance, sodium storage performance and the like.

The invention discloses a preparation process of a rare earth precipitation resistant electrophoretic coating for an automobile body. The preparation process comprises the following steps: S1, preparing a stable solution; s2, preparing a rare earth chelating solution; adding lanthanum lactate into the stable solution for multiple times, and adding ammonium ceric sulfate for multiple times after the lanthanum lactate is completely dissolved; s3, preparing a resin base solution; s4, preparing mixed slurry; s5, adding a solvent and an auxiliary agent; a five-membered ring chelate with thermodynamic stability is formed by carboxyl, hydroxyl and rare earth elements in sodium citrate, rare earth ions can be tightly wrapped through strong coordination bonds, namely, empty orbits of the rare earth ions and lone pair electrons of a chelating agent form coordination bonds, so that the rare earth ions cannot be dissociated in a system, and the rare earth ions are prevented from being dissociated in the system. And a path of generating hydroxide precipitates by free rare earth ions is thoroughly blocked, so that rare earth elements are effectively ensured to be uniformly distributed in the electrophoretic paint, and the surface of a raw material treated by a subsequent electrophoresis process is more uniform.

The hydrogen transmission pipeline steel comprises the following chemical components in percentage by mass: 0.020%-0.045% of C, 0.11%-0.19% of Si, 1.45%-1.65% of Mn, less than or equal to 0.0010% of S, less than or equal to 0.008% of P, 0.015%-0.045% of Al, 0.040%-0.060% of Nb, 0.020%-0.035% of Ti, 0.30%-0.50% of Cr, 0.0040%-0.0080% of RE, less than or equal to 0.004% of N, less than or equal to 0.0015% of O, less than or equal to 0.0001% of H and the balance of Fe and other inevitable impurities, the conditions that the carbon equivalent Ceq = C + Mn / 6 + (Cr) / 5 is less than or equal to 0.35%, the Nb / Ti = the rare earth element is selected from at least one of lanthanum, cerium and neodymium. The invention aims to solve the technical problems that the existing hydrogen transmission pipeline steel is easy to generate hydrogen embrittlement, short in fatigue life and high in production cost in a high-pressure hydrogen environment, and meets the core requirements of hydrogen energy long-distance transmission pipeline engineering on high strength, high hydrogen embrittlement resistance, high fatigue performance and low cost of materials.

The invention belongs to the technical field of tungsten alloy, and particularly discloses a tungsten alloy electrode material and a preparation method thereof.The tungsten alloy electrode material comprises, by weight, 0.1%-0.2% of lanthanum boride, 0.2%-0.5% of zirconium oxide, 0.2%-0.6% of boron carbide, 0.4%-0.8% of cerium oxide, 0.5%-1.2% of tantalum carbide, 1.4%-1.8% of modified carbon nanotubes and the balance tungsten powder. The lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes are added into the tungsten powder, under the combined action of the lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes, the tensile strength and the electrical conductivity are effectively improved, and the high-temperature stability tungsten powder has excellent high-temperature stability and wide application prospects.

The invention relates to a nitrogen-tellurium co-doped carbon-loaded cobalt-lanthanum-gallium triatomic oxygen reduction catalyst as well as a preparation method and application thereof. The catalyst comprises a carbon carrier, doped nitrogen atoms, doped tellurium atoms, supported cobalt atoms, supported lanthanum atoms and supported gallium atoms, wherein the doping proportions of nitrogen atoms and tellurium atoms in the carrier are 3.63 wt%-6.96 wt% and 2.11 wt%-3.83 wt% respectively, the loading capacity of cobalt atoms is 0.86 wt%-1.05 wt%, the loading capacity of lanthanum atoms is 0.38 wt%-0.47 wt%, and the loading capacity of gallium atoms is 0.21 wt%-0.47 wt%; in the preparation method, the nitrogen-tellurium co-doped carbon carrier is fully anchored and coordinated to Co and La atoms through a hydrothermal reaction; and through freeze drying, collapse of a carbon skeleton of the catalyst can be effectively avoided. The obtained catalyst shows good oxygen reduction activity in a solid zinc-air battery, and the peak power density of the catalyst reaches up to 1.68 mW cm <-2 >.

The invention belongs to the technical field of aluminum alloy grain refiners, and particularly relates to a grain refiner and a preparation method and application thereof.The preparation method of the grain refiner comprises the following steps that S1, aluminum powder, vanadium powder, boron powder and lanthanum powder are obtained; s2, after uniform mixing, vacuum ball milling is performed to obtain first powder, and the first powder is sieved to obtain second powder; s3, pressing the second powder to obtain a metal cake; s4, sintering the metal cake in an inert gas atmosphere to obtain a grain refiner; the Al-V-B-La refiner is prepared through a sintering method, the distribution condition of a second phase in the grain refiner and the grain refining effect of the grain refiner are improved through the rare earth element La, the VB2 phase in the grain refiner with the La element added is more uniform in distribution, smaller in size and larger in number density, more second phases can play a role in refining, and the grain refining effect of the grain refiner is improved. And the problem that the refining efficiency is low due to the Si poisoning problem of a traditional grain refiner is solved, and therefore the better aluminum alloy grain refining effect is achieved.

The invention relates to the field of laser cladding powder, in particular to wear-resistant and corrosion-resistant laser cladding powder and a preparation method thereof. The laser cladding powder is used for solving the problem that a cladding layer formed by existing laser cladding powder is poor in abrasion resistance and corrosion resistance. According to the laser cladding powder, the carbon nano tube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder are added, and the carbon nano tube and the lanthanum-yttrium oxide have a synergistic effect to refine grains, so that the corrosion resistance of a cladding layer is improved, and the carbon nano tube has good wear resistance; after the surface of the titanium diboride powder is coated with the copolymer, the dispersity of the titanium diboride is improved, a product decomposed by the copolymer reacts with the titanium diboride under the action of laser to generate titanium carbide, and the wear resistance of a cladding layer is enhanced; the laser cladding powder is suitable for prolonging the service cycle of a mold, can be used for surface strengthening of mine equipment parts, enhances the wear resistance and corrosion resistance of the mine equipment parts, reduces the maintenance frequency of the equipment, and can provide an effective solution for surface strengthening of parts in various industrial fields.

The invention discloses a method for preparing fine-grain copper and copper alloy through pulsed magnetic field and rare earth adding composite regulation and control, and belongs to the technical field of copper and copper alloy material preparation. Graphite mold casting is adopted in the method, and the method comprises the specific steps that electrolytic copper with the purity larger than or equal to 99.95 wt% or a copper alloy with specific components is prepared as a matrix raw material; after smelting, adding pure lanthanum blocks and uniformly stirring; after the melt is poured into a preheating mold, a pulsed magnetic field is applied immediately for treatment, and the parameters of the magnetic field are as follows: the pulse voltage is 180-250 V, the frequency is 4.5-6.5 Hz, and the duration time is 15-20 minutes. According to the method, the heterogeneous nucleation effect of rare earth lanthanum is combined with the melt forced convection and dendritic crystal crushing effect caused by the pulsed magnetic field to synergistically refine a solidification structure and promote columnar crystal orientation equiaxed crystal transformation, so that a cast ingot with fine crystal grains is directly obtained in the casting stage, and the possibility is provided for simplifying the subsequent processing technology.

The invention discloses a copper-based catalyst for catalyzing partial hydrogenation of nitrocyclohexane to prepare cyclohexanone-oxime as well as a preparation method and application of the copper-based catalyst. The catalyst comprises a main active component and an auxiliary active component, the main active component is copper, the auxiliary active component is selected from one or more of titanium, vanadium, chromium, molybdenum, zirconium, cadmium, indium, tin, antimony, niobium, silver, iron, zinc, magnesium, aluminum, bismuth, manganese, lanthanum, gold or lead, the total molar ratio of the copper to the auxiliary active component is (100-1): 1, and the catalyst is prepared by adopting a coprecipitation method or a supported impregnation-coprecipitation method. And the process is simple and green. Under mild conditions, the catalyst can realize the conversion rate gt of nitrocyclohexane; the selectivity of cyclohexanone-oxime is greater than or equal to 99%, and the method is obviously superior to the existing non-noble metal system, and is low in cost, good in stability and suitable for industrial production of green synthesis of caprolactam.

Described herein is a chalcogen-halide solid electrolyte material represented by the following chemical formula: LiAxEyGz, or NaAxEyGz. In embodiments, A denotes one or more elements selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), Lanthanum (La), cerium (Ce), samarium (Sm), and boron (B). In embodiments, E denotes one or more chalcogen elements. In embodiments, G denotes one or more halide elements. In embodiments, the following mathematical formula is satisfied: 0<x<10, 0<y<10, z=nx−2y+1, wherein n=3 when A denotes at least one element selected from the group consisting of La, Ce, Sm, and B, and n=2 when A denotes at least one element selected from the group consisting of Mg, Ca, Sr, and Ba. In embodiments, A is a single element selected from the group consisting of Mg, Ca, Sr, Ba, La, Ce, Sm, or B.

The invention discloses a cerium-zirconium-based high-entropy oxide as well as a preparation method and application thereof. According to the cerium-zirconium-based high-entropy oxide, cerium and zirconium serve as main bodies, and meanwhile rare earth elements (lanthanum, praseodymium, neodymium and samarium) and transition metal elements (manganese, iron, cobalt, nickel, copper and zinc) are introduced to form a high-entropy solid solution with the equal molar ratio and containing 3-8 kinds of metal. In the cerium-zirconium-based high-entropy oxide, the cerium element and the zirconium element respectively account for 20%-40% of the total amount, and the other elements are respectively 10%-30% in an equimolar ratio. The cerium-zirconium-based high-entropy oxide catalyst prepared by the invention has excellent oxygen storage and release capacity and CO oxidation capacity, and the CO complete conversion temperature is 181 DEG C. The method adopts a simple coprecipitation process, is mild in condition and low in cost, and is suitable for large-scale application in the field of tail gas purification.

The invention relates to the technical field of neodymium-iron-boron magnet production, in particular to a sintered neodymium-iron-boron magnet for preparing lanthanum-cerium-yttrium and a method of the sintered neodymium-iron-boron magnet. In the invention, the cerium element is used for replacing a praseodymium-neodymium alloy, meanwhile, the lanthanum and yttrium elements are introduced according to the proportion to generate a synergistic effect to regulate and control the structure of the high-cerium-content sintered neodymium-iron-boron magnet, the yttrium element is used for inhibiting main phase grain coarsening and improving the coercive force, and the lanthanum and yttrium elements can promote the flow of a rare earth-rich liquid phase in the sintering process and improve the diffusivity, so that the high-cerium-content sintered neodymium-iron-boron magnet is obtained. The density is improved.

The application discloses a N2O decomposition catalyst taking waste and old rare earth-based denitration catalyst as raw material and a preparation method thereof, and the catalyst is prepared from the waste and old rare earth-based denitration catalyst, diatomite and kaolin as a N2O decomposition catalyst carrier, and a nickel-lanthanum composite oxide (NiLaO x ) as a catalytically active component. The waste and old rare earth-based denitration catalyst, diatomite and kaolin are prepared into the carrier through crushing, batching and calcining processes, a nickel-lanthanum composite oxide precursor is configured into a colloidal solution, then the carrier is immersed in the nickel-lanthanum composite oxide precursor colloidal solution, and the N2O decomposition catalyst is obtained through drying and calcining. The catalyst not only realizes harmless disposal of the waste and old rare earth-based denitration catalyst, but also uses the waste and old rare earth-based denitration catalyst as a high-value resource for N2O decomposition, and the catalyst has high N2O decomposition activity and strong stability.

The invention belongs to the technical field of thermal insulation materials, and discloses a high temperature resistant Al2O3-SiO2-La2O3 aerogel and a preparation method thereof. The aerogel is composed of Al2O3 doped with two elements of Si and La, wherein the molar ratio of Al to Si to La is 1: (0.01-0.2): (0.01-0.05). The aerogel can resist high temperature, the alpha phase transition temperature is greater than or equal to 1300 DEG C, and the aerogel has high specific surface area retention. The preparation method of the Al2O3-SiO2-La2O3 aerogel comprises the following steps: preparing an aluminum-silicon-lanthanum composite sol, then carrying out gelation and aging, solvent replacement and heating, pressurizing and drying, and carrying out high-temperature heat treatment on an obtained aerogel blank under the condition that the temperature is greater than or equal to 1000 DEG C, so as to obtain the Al2O3-SiO2-La2O3 aerogel. The method has the advantages of low raw material price, simple equipment, low environmental requirements, short time consumption of the whole process flow, and suitableness for industrial production; as a whole, the preparation process is simple, and the cost is low.

An improved method for separating individual and / or groups of rare earth elements from rare earth bearing leach solutions to produce high purity materials for further refinement. According to a first preferred embodiment, the present invention includes a method comprising the steps of: neutralizing a leach solution; introducing ozone into the solution while controlling pH and precipitating cerium oxide; removing the precipitated cerium oxide from the solution; adjusting the pH of the solution in the presence of ozone to precipitate medium / heavy rare earths; removing the precipitated rare earth concentrate from the solution; treating the remaining solution with a precipitating agent to produce a high purity lanthanum precipitate; and removing the solids from the solution.

A process for producing amines by reductive amination, the process includes introducing a feed stream, the feed stream comprising an amino alcohol and a reducing agent, and hydrogen in a reaction zone of a reactor, and contacting the feed stream with a catalyst in the reaction zone. A hydrogen flow rate into the reaction zone is adjusted, and a product stream comprising ethyleneamines is extracted. The catalyst includes a carrier component selected from alumina, silica, and combinations thereof; and an active component having a first metal, a second metal, and a third metal. The first metal is selected from cobalt, nickel, and copper, the second metal is selected from rhenium, ruthenium, chromium, zinc, sodium, calcium, magnesium, strontium, lithium, potassium, barium, cesium, lanthanum, tungsten, iron, silver, titanium, manganese, aluminum, rhodium, platinum, palladium, iridium, and combinations thereof, and the third metal is niobium.

The application discloses a preparation method of a lanthanum-cerium-added neodymium-iron-boron magnet, and belongs to the field of magnet preparation. According to a certain element proportion, R1 and R2 alloys are prepared by using a vacuum spinning belt furnace. After the two kinds of alloys are subjected to hydrogen treatment, two kinds of powders with different particle sizes are respectively obtained, the two kinds of powders are mixed according to a certain proportion, and the magnet is obtained through the processes of forming and orientation, cold isostatic pressing, sintering and aging. The magnet prepared by the method has high performance.

The present application relates to the technical field of extracting rare earth, and particularly relates to an extraction rare earth separation process method. Fluorine-carbon cerium ore crude ore is treated to obtain activated ore powder. The activated ore powder is subjected to alkali pressure boiling oxidation, roasting transformation and optimal dissolution leaching to obtain a purified liquid. The purified liquid is then subjected to barium chloride sulfuric acid removal, lead removal by sulfurized lead, pH adjustment and the like to obtain a low-impurity chlorinated rare earth liquid. The chlorinated rare earth liquid is subjected to multi-stage extraction to obtain a neodymium chloride solution, a praseodymium-neodymium chloride solution and a lanthanum-cerium chloride solution. The solutions are subjected to oxalic acid precipitation and calcination to obtain a rare earth oxide product. The present application adopts fine pretreatment, multi-stage differential extraction and purification processes to achieve efficient separation of lanthanum-cerium, praseodymium-neodymium and neodymium in fluorine-carbon cerium ore and improve product purity.

The invention belongs to the technical field of castable, and relates to a refractory castable and a preparation method thereof. The invention provides a refractory castable taking a rare earth compound as a base material. The refractory castable comprises a first composite refractory material, a second composite refractory material, a binding agent, a water reducing agent and water, the first composite refractory material is composed of a first refractory framework and a first auxiliary agent; the first fireproof framework comprises rare earth compound powder; the second composite refractory material is composed of a second refractory framework and a second auxiliary agent; the second fireproof framework comprises rare earth compound powder; the rare earth compound powder is selected from one or more of cerium oxide, lanthanum oxide, neodymium oxide and yttrium oxide; the stability and corrosion resistance of the high-temperature industrial equipment can be improved.

The embodiment of the invention discloses a donor-receptor complementary co-doped hafnium oxide-based ferroelectric film material and a preparation method thereof. The method comprises the following steps: according to the composition of the donor-receptor complementary co-doped hafnium oxide-based ceramic target material, mixing raw material powder to obtain mixed raw material powder; calcining the mixed raw material powder under a preset condition; pressing and molding the calcined product into a target material green body; and sintering the target material green body to obtain the donor-receptor complementary co-doped hafnium oxide-based ceramic target material. Wherein the composition of the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material is expressed as AxByHf (1-x-y) O2, A is a donor and comprises elements niobium and tan, and B is an acceptor and comprises elements yttrium and lanthanum; x is more than 0.01 and less than 0.05, and y is more than 0.01 and less than 0.05; the raw material powder containing the donor comprises niobium oxide and tantalum oxide, and the raw material powder containing the acceptor comprises yttrium oxide and lanthanum oxide; and taking the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material as a sputtering target, and obtaining the donor-acceptor complementary co-doped hafnium oxide-based ferroelectric material film by using a pulse laser deposition method.

This invention belongs to the field of permanent magnet materials technology, specifically relating to a high-lanthanum-cerium NdFeB sintered permanent magnet and its preparation method. The raw materials for preparing this high-lanthanum-cerium NdFeB sintered permanent magnet include alloy one and alloy two. The chemical formula of alloy one is [(PrNd)]. 1‑x (RL) x ] a (TM) b (HM) c B d Fe 100‑a‑b‑c‑d Given the following conditions: 0.3 ≤ x < 1, 29.5 ≤ a ≤ 32.5, 0 < b ≤ 5, 0 < c ≤ 0.8, 0.85 ≤ d ≤ 1.1, the chemical formula of the alloy component II is (PrNd). a1 Ga b1 Fe 100‑a1‑b1 70≤a1≤90, 0<b1≤20. By combining alloy one and alloy two, and combining them with appropriate sintering and aging processes, high lanthanum-cerium NdFeB sintered permanent magnets are obtained, achieving surface magnetic hardening of high lanthanum-cerium main phase grains.

This invention discloses a transition metal phosphide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The process includes: firstly, dissolving nickel salt, lanthanum salt, urea, and ammonium fluoride in deionized water to synthesize a nickel-lanthanum layered hydroxide nanosheet precursor via a hydrothermal method; secondly, preparing a lanthanum-doped nickel phosphide catalyst using a phosphating reaction; and thirdly, utilizing a lanthanum doping strategy to modulate the electronic structure of nickel phosphide and improve its electrocatalytic reaction performance. This lanthanum-doped nickel phosphide material exhibits good catalytic activity when used to catalyze hydrogen evolution and sulfide ion oxidation reactions. In an integrated two-electrode electrolyzer for sulfide ion oxidation-assisted hydrogen production, it outputs 10 mA cm⁻¹. ‑2 This invention achieves the goal of producing hydrogen and high-value-added sulfur products with low energy consumption by requiring a relatively low voltage of 0.525 V at a current density. It has advantages such as simple preparation process, controllable operating conditions, and low raw material costs, possessing the potential for large-scale production and serving as a high-performance catalyst for electrocatalytic hydrogen production and sulfur ion oxidation reactions.

The invention provides a lanthanum modified magnetic nano carbon adsorbent as well as a preparation method and application thereof, and belongs to the technical field of water treatment. The method comprises the following steps: performing catalytic pyrolysis on biomass by Fe < 3 + > to form hierarchical porous biochar; epitaxially growing a Fe3O4 magnetic layer by a hydrothermal method; carrying out free radical polymerization grafting on poly (1-vinyl imidazole); and La < 3 + > coordination loading and alkali activation. When 0.03 g / L (pH is 3-4) of the obtained adsorbent is added into phosphorus-containing wastewater, the 30-min phosphate removal rate is larger than or equal to 94%, the Langmuir adsorption capacity is larger than or equal to 117.32 mg P / g, and the adsorption retention rate is larger than or equal to 90% and the La dissolution rate is smaller than or equal to 0.2% after five times of circulation. According to the lanthanum modified magnetic nano-carbon adsorbent as well as the preparation method and the application thereof, lanthanum modification is performed on the magnetic nano-carbon, so that the obtained lanthanum modified magnetic nano-carbon adsorbent has the advantages of high adsorption capacity on phosphate in a water body, good selectivity, high removal rate, easiness in separation and recovery, small mass loss, no dissolution, no secondary pollution problem and the like.