15 results about "Lanthanum phosphate" patented technology

The invention provides a phosphorus-fixing lanthanum-based nano composite material as well as a preparation method and application thereof, and relates to the field of novel nano composite materials. According to the material, lysozyme protein fibers are taken as a structural template, a confinement space is constructed by utilizing the ultrahigh length-diameter ratio of the lysozyme protein fibers, and controllable synthesis of the sub-5nm high-dispersion lanthanum oxide nanoparticles is realized. Functional groups in a protein chain can be enriched and nucleation sites can be provided through electrostatic attraction and key coordination synergistic effect, so that the lanthanum-based protein fiber nano composite material is formed. When the material is used for treating phosphorus wastewater, efficient phosphorus removal and long-term phosphorus fixation are realized through an enrichment-conversion synergistic mechanism: phosphate ions are enriched through electrostatic adsorption, and thermodynamically stable lanthanum phosphate is generated in situ at lanthanum active sites. According to the method, gt is still kept in the presence of high-concentration equal competitive ions; the phosphorus removal rate is 90%, the generated lanthanum phosphate can be used as a slow-release phosphate fertilizer or an industrial phosphorus chemical raw material, and closed-loop conversion from pollution purification to resource utilization is realized.

The application provides a lithium phosphate-lanthanum phosphate composite coated lithium-rich manganese-based positive electrode material, and a method of adopting an ethanol-water mixed solvent evaporation drying combined with low-temperature sintering to uniformly construct a composite coating layer composed of ion conduction type lithium phosphate and inert stable type lanthanum phosphate on the surface of the lithium-rich manganese-based positive electrode material. The complementary function and the synergistic distribution in space of the lithium phosphate and the lanthanum phosphate together realize the comprehensive modification effect of "no reduction of ion transmission and effective inhibition of side reaction", effectively solve the key technical problems of low first coulomb efficiency, serious voltage attenuation in the cycle process and transition metal dissolution of the lithium-rich manganese-based positive electrode material, and meet the pursuit of people on the comprehensive performance of the high-energy-density lithium ion battery positive electrode material.

The application discloses a preparation method of quartz fiber reinforced quartz composite material containing a lanthanum phosphate interface phase, and the method comprises the following steps: vacuum impregnating a quartz fiber fabric from which an impregnant is removed in a lanthanum phosphate precursor solution, and obtaining the quartz fiber fabric containing the lanthanum phosphate interface phase after high-temperature sintering; vacuum impregnating the quartz fiber fabric in a silica sol, and repeating impregnation-drying until densification after drying; and high-temperature sintering the quartz fiber reinforced quartz composite material blank, and continuing to repeat the impregnation-drying-sintering process for multiple cycles after sintering, so as to finally obtain the dense and uniform quartz fiber reinforced quartz composite material containing the lanthanum phosphate interface phase. Since the lanthanum phosphate interface phase exists, the quartz fiber reinforced quartz composite material prepared has good denseness, improved material toughness and enhanced mechanical properties.

The invention relates to the technical field of battery materials, and discloses a lanthanum metaphosphate coated lithium cobalt oxide composite material and a preparation method thereof. The preparation method comprises the following steps: taking trivalent metal lanthanum salt and phosphate as raw materials, obtaining high-purity lanthanum metaphosphate through a solid phase method, then dispersing the lanthanum metaphosphate into a solvent, adding lithium cobalt oxide, and carrying out wet coating, so as to obtain the lithium cobalt oxide material coated with a lanthanum metaphosphate shell. The lanthanum metaphosphate coated lithium cobalt oxide composite material provided by the invention has excellent conductivity, rate capability and cycle performance.

The invention discloses a synthetic ammonia catalyst with good stability and a preparation method thereof, and belongs to the technical field of catalyst preparation. The invention discloses a synthetic ammonia catalyst with good stability. The synthetic ammonia catalyst is prepared from the following raw materials: ferric nitrate, ammonium molybdate, manganous nitrate, deionized water, sodium polyacrylate, neodymium nitrate, yttrium nitrate, lanthanum phosphate and a MgAl2O4-TiO2-BN composite carrier. The MgAl2O4-TiO2-BN composite carrier is prepared from the following raw materials in parts by weight: 14 to 16.5 parts of magnesium nitrate, 85 to 90 parts of aluminum nitrate, 25 to 29 parts of modified TiO2-BN nanosheets, 46 to 51 parts of citric acid and 400 to 450 parts of water; the modified TiO2-BN nanosheet is prepared from the following raw materials: h-BN powder, tetrabutyl titanate, absolute ethyl alcohol, a dilute nitric acid solution and a hydrogen peroxide solution. The synthetic ammonia catalyst has strong anti-sintering and anti-poisoning capabilities.

The invention belongs to the technical field of polytetrafluoroethylene tube preparation, and particularly relates to a modified polytetrafluoroethylene tube and a preparation method thereof. The modified polytetrafluoroethylene tube is prepared from the following raw materials in percentage by mass: 74-76% of polytetrafluoroethylene resin, 4-5% of modified red mud, 3.0-4.0% of a mixture of modified nano lanthanum phosphate and magnesium borate whiskers and 16-18% of an extrusion aid. According to the modified polytetrafluoroethylene tube, the polytetrafluoroethylene resin is used as matrix resin, the mixture of the modified red mud and the modified nano lanthanum phosphate and magnesium borate whiskers is used as filler, and the raw materials have a synergistic effect, so that the prepared modified polytetrafluoroethylene tube has relatively high tensile strength and relatively low water vapor permeability.

The invention discloses environment-friendly antibacterial polyurethane sponge for an automobile and a preparation method of the environment-friendly antibacterial polyurethane sponge, and belongs to the field of polyurethane sponge preparation, and the method comprises the following steps: acquiring a vehicle seat skin material and sweat permeability data thereof, and classifying the vehicle seat skin material according to low permeability, medium permeability and high permeability; raw materials are prepared and composed of bio-based polyol, modified MDI, a pore opening agent, a catalyst, deionized water, a flame retardant, a reinforcing filler, a lanthanum polyphosphate carrier, silver nitrate, zinc nitrate, a reducing agent and a dispersing agent, and the raw materials are pretreated; silver nitrate, zinc nitrate and part of the raw materials are premixed to prepare a group A solution, and a composite antibacterial agent is prepared; according to the preparation method, the skin of the automobile seat is graded according to the sweat permeability, and the composite antibacterial agent containing the silver-zinc heterogeneous nanoparticles is prepared, so that an efficient and lasting antibacterial effect can be realized, resource waste is avoided, the cost and the performance are balanced, and the environmental protection property and the practicability of the automobile seat sponge are improved.

The invention relates to the technical field of catalysis, in particular to application of a metal phosphate solid acid catalyst in a reaction for synthesizing cyclopentadiene by dehydrating 1, 3-cyclopentanediol. The metal phosphate solid acid catalyst is one or a mixture of more than two of lanthanum phosphate, cerous phosphate, aluminum phosphate, zirconium phosphate, titanium phosphate and tin phosphate. The invention provides a catalyst for selective synthesis of renewable cyclopentadiene by dehydration of a biomass derivate 1, 3-cyclopentanediol and an application method thereof, the catalyst has high catalytic efficiency and good stability, and can efficiently catalyze dehydration of 1, 3-cyclopentanediol under mild conditions to selectively synthesize cyclopentadiene. The catalyst is easy to prepare and low in cost, a simple coprecipitation method is adopted, and industrialization is easy to achieve.

The application provides a high-density preparation method of an alumina fiber reinforced alumina ceramic matrix composite material and a low-temperature preparation method thereof. The method comprises the following steps: pretreating and degumming an alumina fiber preform; preparing a lanthanum phosphate interface solution; vacuum impregnating the pretreated alumina fiber preform in the lanthanum phosphate interface solution, and then taking out the preform to be placed and dried at low temperature, pre-sintered at low temperature, and cycled for multiple times until the interface layer reaches a set thickness, so that a preform containing a lanthanum phosphate interface layer is obtained; preparing an aluminum sol containing lithium fluoride; vacuum impregnating the preform containing the lanthanum phosphate interface layer in the aluminum sol containing lithium fluoride, and then taking out the preform to be placed and dried at low temperature, pre-sintered at low temperature, and cycled for multiple times until the weight gain is less than 1 wt%, and then performing normal pressure sintering in an air atmosphere, so that the alumina fiber reinforced alumina ceramic matrix composite material containing the lanthanum phosphate interface layer is obtained.

The invention provides a crucible for calcining high-purity zirconia powder and a preparation method of the crucible, and belongs to the technical field of crucibles. The preparation method comprises the following steps: mixing fused quartz, alumina-based sintered mullite, alumina micro-powder, micron-sized zirconium dioxide micro-powder, nano-sized zirconium dioxide micro-powder, polycrystalline mullite short fibers, a plasticizer, a binding agent, nano organic resin microspheres, acrylic fibers, carbon fibers, lanthanum phosphate, a stabilizer, lanthanum oxide and scandium oxide, pressing, and sintering to obtain a finished product. Natural gas chemical vapor deposition carbon densification, siliconizing and zirconium permeation are carried out, then graphitization is carried out, the crucible for high-purity zirconia powder calcination is prepared, and the crucible has the advantages of being high in purity, good in thermal shock resistance and smooth in surface and has wide application prospects.

This invention discloses a yttrium-doped lithium lanthanum phosphate (LLPO) solid electrolyte and its preparation method, belonging to the field of solid electrolyte technology. The technical problem this invention aims to solve is the low ionic conductivity and uneven distribution of doping elements in existing LLPO solid electrolytes. The method of this invention includes: first preparing a electrolyte with the chemical formula Na3La... 1‑ x Y x A yttrium-doped sodium lanthanum phosphate precursor (PO4)2, wherein 0.01 ≤ x ≤ 0.10, is then subjected to an ion exchange reaction with a lithium salt to obtain Li3La 1‑x Y x This invention presents a yttrium-doped lanthanum phosphate lithium oxide solid electrolyte (LLPO)₂. Through a "doping followed by exchange" preparation route, this invention achieves uniform and stable yttrium doping in the LLPO lattice, effectively increasing lithium-ion migration channels and significantly improving the ionic conductivity and electrochemical stability of the solid electrolyte. Simultaneously, it simplifies the preparation process and reduces energy consumption. The solid electrolyte of this invention can be used in all-solid-state lithium batteries.

The invention belongs to the technical field of pigments and fillers, and particularly relates to a preparation method of a barium lanthanum phosphate pigment and filler and application of the barium lanthanum phosphate pigment and filler in a coating. The preparation method comprises the following steps: fully grinding a barium source compound, a rare earth lanthanide compound and a phosphorus source compound in proportion, calcining at a high temperature in an air atmosphere, and then fully grinding again to obtain a mixture; and performing high-temperature calcination on the mixture in the air atmosphere again, and fully grinding the product obtained by calcination to obtain the barium lanthanum phosphate pigment filler. The barium lanthanum phosphate pigment filler prepared by the invention is applied to a coating, the corrosion resistance, weather resistance, impact resistance, wear resistance and hardness of the coating can be improved, and the preparation process is simple and convenient and is easy for large-scale production.

The application discloses a synthetic ammonia catalyst with good stability and a preparation method thereof, and belongs to the technical field of catalyst preparation. The synthetic ammonia catalyst with good stability is prepared from the following raw materials: iron nitrate, ammonium molybdate, manganese nitrate, deionized water, sodium polyacrylate, neodymium nitrate, yttrium nitrate, lanthanum phosphate and a MgAl2O4-TiO2-BN composite carrier. The MgAl2O4-TiO2-BN composite carrier is prepared from the following raw materials in parts by weight: 14-16.5 parts of magnesium nitrate, 85-90 parts of aluminum nitrate, 25-29 parts of modified TiO2-BN nanosheets, 46-51 parts of citric acid and 400-450 parts of water. The modified TiO2-BN nanosheet is prepared from the following raw materials: h-BN powder, tetrabutyl titanate, anhydrous ethanol, a dilute nitric acid solution and a hydrogen peroxide solution. The synthetic ammonia catalyst has high sintering resistance and high resistance to poisoning.

The application relates to a coating prolonging the high-temperature service life of a metal component and application, in particular to a coating which is composed of a high-entropy alloy intermediate layer, an oxidation-resistant layer, an oxygen-blocking layer and a heat-insulating layer in sequence, the high-entropy alloy intermediate layer is composed of seven or more elements and has an ordered L12 crystal structure, the oxidation-resistant layer is composed of a Pt-containing metal parent phase with an ordered L12 crystal structure and a small amount of alumina nanoparticles, the oxygen-blocking layer is alumina, and the heat-insulating layer is composed of nano lanthanum phosphate and nano yttria-stabilized zirconia. The coating is applied to the heated surface of a component, including but not limited to the surface of components such as an aero-engine combustion chamber, a turbine and a nozzle, and plays the roles of oxidation resistance, heat insulation, ablation resistance, high-temperature corrosion resistance and erosion resistance. The application has the advantages that the allowable temperature of a part can be increased to 1500 DEG C, the high-temperature creep life of the protected part is not damaged, the heat insulation temperature is increased by more than one time compared with common thermal barrier coatings, and the service life is increased by more than 20 times.

This invention relates to a supported catalyst, its preparation method, and its application in the preparation of methyl glyoxylate. The catalyst consists of a support and an active metal component supported on the surface of the support; the support is lanthanum phosphate, and the active metal component is vanadium oxide and molybdenum oxide; wherein the mass percentage of vanadium oxide and molybdenum oxide in the supported catalyst is 20-40%. This catalyst exhibits excellent performance in the oxidative dehydrogenation reaction of methyl glycolate, with high feed conversion rate and target selectivity, and has broad application prospects.