15 results about "Cerium phosphate" patented technology

The invention belongs to the technical field of lithium ion batteries, and relates to a high-mechanical-strength porous carbon-based silicon-carbon negative electrode material and a preparation method thereof. In a Raman spectrum of the high-mechanical-strength porous carbon, the high-mechanical-strength porous carbon has a T peak at 1165 + / -35 cm <-1 >. The preparation method comprises the following steps: thermoplastic phenolic resin is subjected to cross-linking curing, carbonization, activation and chambering in sequence, and a porous carbon precursor is obtained; carrying out heat treatment on the porous carbon precursor by using a boron-containing compound and cerous phosphate in an inert atmosphere to obtain high-mechanical-strength porous carbon; and carrying out silicon deposition and carbon coating to obtain the porous carbon-based silicon-carbon negative electrode material with high mechanical strength. The porous carbon is modified by the boron-containing compound and the cerous phosphate according to a specific ratio, so that the sp3 / sp2 ratio in the porous carbon is regulated and controlled, the high-mechanical-strength porous carbon and the silicon-carbon negative electrode material containing the high-mechanical-strength porous carbon are obtained, the electrochemical performance of the lithium ion battery is obviously improved, particularly, the capacity fading rate under high pressure is greatly reduced, and the service life of the lithium ion battery is prolonged. And the cycle performance is obviously improved.

This invention discloses a method for preparing high specific surface area cerium phosphate nanoparticles. The modified corn starch in this invention exhibits good water solubility, resulting in a solution with good suspension and stability after dissolving in water. This suspension stability provides a spatial carrier for the formation of cerium phosphate nanoparticles. A network structure is formed through hydrogen bonding between the molecular weight chains of the modified corn starch, allowing control over the uniformity of cerium phosphate particle size. Different specific surface area values ​​of cerium phosphate can be controlled by adjusting the concentration of the modified corn starch. The modified corn starch can be removed through subsequent high-temperature sintering and washing, ultimately yielding high-purity cerium phosphate nanoparticles. These nanoparticles possess uniformity and high specific surface area, making them suitable for applications in electrode materials, adsorbent materials, luminescent materials, and polymer nanofillers.

This invention discloses a method for precipitation separation and ceramic solidification of divalent strontium and tetravalent uranium in radioactive waste liquid, relating to the field of radioactive waste liquid treatment and disposal. U in high-level radioactive waste liquid is in the form of hexavalent uranyl (UO2). 2+ U exists in the form of hydrogenation catalytic reduction, and the present invention uses hydrogenation catalytic reduction to prepare U. 4+ Sr 2+ and U 4+ ionic radius and Ln 3+ Due to the significant differences, CePO4·0.667H2O cerium phosphate, which has a stronger nuclide-containing capacity, was selected as the co-precipitation enrichment agent for Sr. 2+ and U 4+ Separation precipitant. Inexpensive raw materials such as UO2(NO3)2·6H2O, Sr(C2H3O2)2, NH4H2PO4, and Ce(NO3)3·6H2O are selected. By controlling the Sr... 2+ :U 4+ Ion ratio, reaction time, temperature, pH, and preparation of well-developed Sr crystals 2+ / U 4+ The precipitate of cerium phosphate solid solution with high solid content is avoided by using spark plasma solid-state sintering technology to prevent grain agglomeration and adhesion during high-temperature dehydration and crystal transformation of cerium phosphate. Furthermore, pressure sintering can promote further growth of nanocrystals and promote U... 4+ and Sr 2+ Homogenization within the monazite ceramic solidified body enables a one-step preparation of monazite ceramic solidified body from a lanthanite solid solution.

This invention provides a lithium cobalt oxide cathode material coated with a lithium aluminum titanium phosphate composite, which has a core-shell structure, comprising a doped lithium cobalt oxide core material inside the core-shell structure and a coating layer formed on the surface of the doped lithium cobalt oxide core material; the chemical formula of the doped lithium cobalt oxide core material is: LiCo 1‑a‑b‑c Mg a Al b Ce c The coating layer comprises lithium aluminum titanium phosphate, cerium titanate, lithium cerium phosphate oxide, and lithium cerium phosphate. This invention's lithium aluminum titanium phosphate composite coating modified lithium cobalt oxide cathode material overcomes the defect of a sharp performance drop under high temperature and high pressure applications when lithium aluminum titanium phosphate is coated alone. The oxygen vacancies and coating structure provided by the composite coating layer of lithium aluminum titanium phosphate, cerium titanate, lithium cerium phosphate oxide, and lithium cerium phosphate enhance the structural continuity between the bulk phase and the coating layer, as well as the conductivity of the fast ion conductor, thereby enabling the material to maintain good cycle retention and capacity characteristics under high temperature and high pressure.

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.

This invention belongs to the field of special ceramics preparation technology, specifically relating to a high-temperature resistant special ceramic and its preparation method. The high-temperature resistant special ceramic, by weight, comprises the following raw materials: 22-24 parts calcined kaolin, 20-22 parts andalusite, 30-32 parts tabular corundum, 2.5-4.5 parts calcite, 1.3-2.3 parts cerium phosphate, 15-17 parts calcium zirconate, 3.7-4.7 parts yttrium oxide, 2-3 parts titanium diboride, and 1.2-2.2 parts gadolinium trioxide. The high-temperature resistant special ceramic of this invention uses tabular corundum, calcined kaolin, and andalusite as main raw materials, calcite and cerium phosphate as sintering aids, and calcium zirconate, yttrium oxide, titanium diboride, and gadolinium trioxide as fillers, ensuring that the prepared special ceramic exhibits excellent flexural strength and fracture toughness at high temperatures.

The invention discloses a dressing for repairing a skin defect wound as well as a preparation method and application of the dressing, and belongs to the field of dressing application materials. The dressing prepared by the invention is a film embedded with cerous phosphate nanorods and loaded with polyphenol drugs, and the method comprises the following steps: uniformly dispersing the prepared cerous phosphate and the drugs in a certain proportion in absolute ethyl alcohol by utilizing ultrasound, then adding polymer polyvinylpyrrolidone to be completely dissolved, and preparing the dressing. The prepared precursor solution is added into a used electrospinning device or a spray gun, and parameters in the process are adjusted so that the dressing can be deposited in situ at a wound. As the material has good hydrophilicity, can quickly absorb wound exudate, has good biocompatibility and active oxygen scavenging ability, can adapt to the requirements of irregular wounds, and is suitable for treating chronic inflammation skin wounds caused by acute full-thickness skin defect wounds or diabetes and the like.

The present invention discloses a corundum sagger for high-temperature sintering of high-purity alumina ceramics and a preparation method thereof. The specific steps of the present invention are as follows: step S1, mixing sintered corundum particles and premixed fine powder in a certain mass ratio to obtain a premix; the premixed fine powder includes sintered corundum fine powder, fused zirconium corundum fine powder, rare earth composite yttrium zirconium ceramic powder, cerium phosphate powder and amorphous alumina fine powder; step S2, adding a certain mass of potato starch and ρ-alumina colloidal solution to the premix in sequence, and mixing them evenly to obtain a mixture; step S3, sealing the mixture to obtain a plastic material; step S4, demolding the plastic material after molding to obtain a green body; step S5, hot-pressing and sintering the green body to obtain a corundum sagger for high-purity alumina ceramics. The corundum sagger for high-temperature sintering of high-purity alumina ceramics prepared by the present invention has a high service temperature, good sintering performance, high strength, high load softening temperature and good thermal shock resistance.

The invention provides a lithium aluminum titanium phosphate compound coated modified lithium cobalt oxide positive electrode material which is of a core-shell structure and comprises a doped lithium cobalt oxide core material in the core-shell structure and a coating layer formed on the surface of the doped lithium cobalt oxide core material, the chemical formula of the doped lithium cobalt oxide nuclear material is LiCo < 1-a-b-c > Mg Al CecO < 2 >, and the coating layer comprises lithium titanium aluminum phosphate, cerium titanate, oxidized lithium cerium phosphate and lithium cerium phosphate. The lithium titanium aluminum phosphate compound coated modified lithium cobalt oxide positive electrode material overcomes the defect that the performance of the material is suddenly reduced under the application of high temperature and high pressure when the lithium titanium aluminum phosphate material is independently coated. An oxygen vacancy and a coating structure provided by a composite coating layer of lithium aluminum titanium phosphate, cerium titanate, oxidized lithium cerium phosphate and lithium cerium phosphate can enhance the structural continuity between a bulk phase and the coating layer and the conductivity of a fast ion conductor, so that the material has a good cycle retention rate at high temperature and high pressure, and the capacity characteristic of the material is maintained.

The invention belongs to the technical field of special ceramic preparation, and particularly relates to high-temperature-resistant special ceramic and a preparation method thereof. The high-temperature-resistant special ceramic is prepared from the following raw materials in parts by weight: 22 to 24 parts of calcined kaolin, 20 to 22 parts of andalusite, 30 to 32 parts of tabular corundum, 2.5 to 4.5 parts of calcite, 1.3 to 2.3 parts of cerous phosphate, 15 to 17 parts of calcium zirconate, 3.7 to 4.7 parts of yttrium oxide, 2 to 3 parts of titanium diboride and 1.2 to 2.2 parts of gadolinium trioxide. According to the high-temperature-resistant special ceramic disclosed by the invention, the tabular corundum, the calcined kaolin and the andalusite are taken as main raw materials, the calcite and the cerous phosphate are taken as sintering aids, and the calcium zirconate, the yttrium oxide, the titanium diboride and the gadolinium oxide are added as fillers, so that the prepared special ceramic has excellent bending strength and fracture toughness at a high temperature.

This invention provides a method for the deep treatment and resource utilization of polycarbonate brine. The method includes the following steps: preparing a modified support for PO / SM tar-coal slag; preparing a cobalt and / or cerium phosphate ester complex metal; dissolving the phosphate ester complex metal to obtain a solution; impregnating the modified support; drying; and calcining to obtain a catalytic oxidation catalyst. The catalyst comprises a support and an active component; the support is a modified support for the co-production of styrene (PO / SM) tar from propylene oxide, and the active component is the phosphate ester complex metal. The catalyst of this invention can effectively remove organic matter, reduce ion-exchange membrane voltage, and realize the resource utilization of waste brine.

The invention relates to the technical field of fiber preparation, in particular to an ultraviolet-proof flame-retardant fiber and a preparation method and application thereof.The ultraviolet-proof flame-retardant fiber is prepared from, by mass, 1.5-9% of flame-retardant cerium-magnesium-aluminum compound functional powder and the balance fiber forming polymer; the flame-retardant cerium-magnesium-aluminum compound functional powder is prepared from the following raw materials: cerium-magnesium-aluminum compound functional powder, an organic flame retardant and an organic solvent, the cerium-magnesium-aluminum compound functional powder is prepared by blending and calcining cerium dioxide, cerous phosphate and magnesium-aluminum hydrotalcite, can be used for preparing a fabric for a medical partition curtain, and solves the problems of insufficient ultraviolet protection capability, short service life, potential safety hazard of promoting fire behavior and the like of a common partition curtain in an extreme ultraviolet disinfection environment. And the practical application requirements are better met.

The application discloses a sulfur-tolerant ammonia selective catalytic oxidation catalyst suitable for escape ammonia control and a preparation method and application thereof. The catalyst has a core-shell structure with a chromium-cerium composite oxide as a core and cerium phosphate as a shell. The preparation method comprises the following steps: firstly, preparing the chromium-cerium composite oxide core by using a coprecipitation method; and then mixing the core with a small amount of CePO4 crystal seeds and growing the CePO4 shell by using a hydrothermal method. The catalyst has excellent characteristics such as a wide temperature window, high activity, high water-sulfur stability and the like, can realize low-cost removal of escape ammonia in an SCR section, and overcomes the problems of poor temperature window matching and poor water-sulfur stability of a current NH3-SCO catalyst.

The application discloses a catalyst for treating catalytic combustion of CVOCs and a preparation method and application thereof. The preparation method comprises the following steps: (1) impregnating cerium nitrate and trimethyl phosphate on a carrier, drying, and calcining at 600-800 DEG C to form a modified carrier containing a cerium phosphate crystal phase; and (2) impregnating active metal ruthenium on the modified carrier, drying, and calcining to obtain the catalyst for treating catalytic combustion of CVOCs. The catalyst can be used for catalytic combustion degradation of dichloromethane, chlorobenzene, chloroethylene, dichloroethane, dichloroethylene, oxygen-containing chloropropane and other CVOCs. For catalytic combustion degradation of CVOCs, the catalyst can exhibit high activity, high chlorine resistance, low selectivity of polychlorinated by-products and high thermal stability, and has certain industrial application prospect.

The application discloses a catalyst for preparing propylene glycol monoethyl ether acetate and a preparation method and application thereof. The catalyst is prepared by adopting a grinding method and a supercritical oxygen crystallization method. The supercritical oxygen has high solubility and high diffusivity, so that the solid-phase reaction mixture obtained by grinding is fully contacted with oxygen and quickly dissolved in a crystallization kettle, the crystallization time is short, and the nano molybdenum cerium phosphate with small crystal grain size and high crystallinity is beneficial to be formed, and the yield is high. The nano molybdenum cerium phosphate has a large number of exposed acidic active sites on the surface and rich acid. Under the action of the catalyst, the yield of the propylene glycol monoethyl ether acetate is high.