46 results about "Cerium phosphate" patented technology

The present invention relates to a new type of green luminophore composed of mixed rare-earth phosphates, and a method of preparation of these new luminophores from precursors comprising particles having a mean diameter of between 1.5 and 15 microns, these particles comprising an inorganic core and a shell composed of a mixed lanthanum and/or cerium phosphate, optionally doped with terbium, evenly covering the inorganic core with a thickness greater than or equal to 300 nm.

The invention provides a preparation method of cerium phosphate nano-wires. The preparation method comprises the following steps: respectively preparing a Ce<3+> salt solution and a PO4<3-> salt solution; adding the PO4<3-> salt solution to the Ce<3+> salt solution under continuous stirring to obtain a mixed solution I; stirring the mixed solution I, and adjusting the pH value of the mixed solution I to 0.5-10.0 to obtain a mixed solution II; and ageing the mixed solution II at 4-89DEG C under an environmental pressure for above 1h to obtain the cerium phosphate nano-wires. The preparation method can be implemented through adopting simple and cheap equipment under the environmental pressure, so it is convenient for realizing the industrialized production; and there is no need to add a template in the preparation process, so the environmental influence possibly brought by a waste liquid is avoided.

This invention discloses a UV-luminescent sodium cerium phosphate crystal material, which has the crystal form of orthorhombic system, and the space group of Pnma; a = 8.6202, b = 5.2907, c = 12.6800, alpha = beta = gamma = 90degree, and V = 578.305. The crystal is synthesized by: completely grinding the raw materials, mixing uniformly in a Pt crucible, placing in a carbinet furnace, heating for synthesis, keeping temperature at the highest point, and cooling slowly to room temperature to obtain sodium cerium phosphate monocrystal. The crystal material can be used in small-scale and high-power solid lasers.

The invention relates to a wide temperature range type phosphorus-containing cerium-based denitration catalyst and a preparation method thereof. The catalyst is mainly prepared from cerium phosphate (CePO4) and manganese oxide Mn2O3 according to the molar ratio of 1:0.5-3. The wide temperature range type phosphorus-containing cerium-based denitration catalyst has the nitrogen oxide removal temperature interval of 150-500 DEG C and has high denitration stability and N2 selectivity. In particular, the nitrogen oxide removal effects of the phosphorus-containing cerium-based denitration catalyst in low-medium temperature intervals (150-350 DEG C) are good, and the nitrogen oxide conversion rates are both above 90%.

The invention aims to provide a hexagonal crystal phase nanometer spherical CePO4 granular material with regular morphology, high crystal phase purity and obvious light-emitting performances and a preparation method of a rare-earth doped hexagonal crystal phase nanometer spherical CePO4 granular material serving as an activating agent. The hexagonal crystal phase nanometer spherical CePO4 granular material is characterized by being synthesized by regarding quadrivalent cerium salts as a cerium source and adopting a solvent thermal crystallization method. The preparation method comprises the steps of precipitation, crystallization, washing and drying, to be specific: mixing quadrivalent cerium salts with rare-earth ion solution serving as an activating agent; adding a water-soluble organic alcohol and/or water-soluble polymer and mixing uniformly; adding a phosphoric acid or phosphate precipitator solution to generate cerous phosphate and the activating agent rare-earth doped cerous phosphate intermediate phase precursor; and then sealing the cerous phosphate and the activating agent rare-earth doped cerous phosphate intermediate phase precursor into a kettle for a solvent thermal crystallization reaction so as to prepare the hexagonal crystal phase nanometer spherical CePO4 and rare-earth doped CePO4 particles. According to the invention, addition amounts of the water-soluble organic alcohol and the water-soluble polymer in a solvent heat system are changed, and the particle size of the product can be controlled.

The invention relates to a cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and a preparation method thereof. The method comprises the steps: (1) alternatively preparing a cerium phosphate interface layer and a silicon carbide interface layer on the surface of silicon carbide fiber preforms until the predetermined thickness or the predetermined number of layers is reached, and thus preparing modified silicon carbide fiber preforms; (2) impregnating the modified silicon carbide fiber preforms with a carbon precursor solution, and then solidifying andsplitting the impregnated modified silicon carbide fiber preforms in turn; (3) repeating the step (2) at least once, and thus preparing porous silicon carbide fiber preforms; and (4) carrying out liquid silicon melt-infiltration reaction of the prepared porous silicon carbide fiber preforms, and thus preparing the cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material. The prepared cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material has the advantages of excellent oxidation resistance, temperature resistance andthermal shock resistance, excellent comprehensive performance at high temperature and long service life.

The invention, which belongs to the environment-friendly monitoring method field, relates to a method for preparing a water body phosphate oxygen isotope sample through in-situ enrichment. The methodcomprises the following steps: immersing a Zr-Oxide gel film into a water body, fishing out the Zr-Oxide gel film after a period of time, putting the Zr-Oxide gel film into a sodium hydroxide solution, carryin gout oscillating for 24 hours, and carrying out filtering to obtain a phosphorus-containing eluent; adjusting the pH value of the eluent to 5.8 and adding a cerous nitrate solution to adjustthe pH value to 5.5; adding nitric acid into a cerium phosphate precipitate, adding cation exchange resin after dissolving of the cerium phosphate precipitate, and carrying out oscillation for 12h; filtering the solution after cation exchange resin processing into a black centrifuge tube, adjusting the pH value to 8.5 by using ammonia water, adding a silver nitrate solution, carrying out centrifuging to obtain a silver phosphate precipitate; washing the silver phosphate precipitate with pure water, adding hydrogen peroxide to react for more than 3 hours, carrying out centrifuging to retain the precipitate, washing the centrifugal precipitate with pure water, and carrying out freezing and drying. Therefore, large-volume sampling can be avoided effectively; and the difficulty or steps of filtration and impurity removal can be reduced or simplified obviously. The method is a novel method for preparing a water body phosphate oxygen isotope sample.

The invention belongs to the technical field of titanium dioxide production, and particularly relates to a surface treatment technology of special titanium dioxide for papermaking. The technology comprises the following steps: adding a dispersant into a sanded titanium dioxide slurry, performing stirring for dispersing, sieving to obtain a slurry with the TiO2 content of 200-400 g/L, coating the surfaces of titanium dioxide particles with cerium phosphate, silicon dioxide and phosphorus pentoxide, finally coating the surfaces of the titanium dioxide particles with aluminum oxide by parallel flow of alkaline aluminum and acidic aluminum, carrying out solid-liquid separation, and processing the obtained solid to obtain the finished product. The cerium salt and silicate are used for coating the titanium dioxide particles at the same time, so that the sun-proof property of titanium dioxide in a papermaking system is greatly enhanced, and the service life of titanium dioxide is prolonged; and the alkaline aluminum and acidic aluminum parallel flow coating of the aluminum oxide greatly saves the space of a coating tank, so the coating amount of titanium dioxide by one coating tank is increased, the yield is increased within the same time, and the economic benefit can be well improved.

The invention discloses a polymer emulsion interfacial agent for treating a building wall and a preparation method of the polymer emulsion interfacial agent. The polymer emulsion interfacial agent comprises a component A and a component B, which are mixed at the weight ratio of 1:1 during use, wherein the component A comprises the concrete components as follows: hydroxyethyl cellulose, a dispersing agent, quartz powder, a styrene-acrylate polymer emulsion, rare-earth nanometer Ce-ATO modified acrylic resin, an anticorrosive agent, a mildewproof agent, a multifunctional additive, a thickening agent, a defoaming agent and a coalescing agent, water and unsaturated polyester resin; and the component B comprises the following components: wollastonite powder, quartz powder, quartz sand, cerium phosphate, a titanate coupling agent, cobalt naphthenate and methyl ethyl ketone peroxide. The polymer emulsion interfacial agent has the characteristics of simple preparation process, high adhesive force, wear resistance, good sealing property and the like and can be well used on a smooth-surface substrate.

The invention discloses a coating material applied for improving the thermal stability of green fluorescent powder of (La1-x-yCexTby) PO4 and a preparation method thereof. The invention includes the following steps: 1. lanthanum chloride and diammonium phosphate are prepared into a dilute solution with equal volume and equal concentration by secondary de-ionized water and heated for maintaining the temperature between 60 and 90 DEG C; 2. lanthanum phosphate, cerium phosphate and terbium phosphate are co-settled in a container, added with the secondary de-ionized water, heated for maintaining the temperature between 60 and 90 DEG C and stirred at a constant speed of 20 to 50 r/min; 3. the two liquids are slowly dripped into a suspension liquid in step 2 at an equal speed and stirred at a constant speed; after the dropping is finished, stirring is stopped and diluted acid or weak base is used for regulating the pH value of the suspension liquid to be between 4.0 and 6.0; then the suspension liquid stands for 2 to 3h; 4. the suspension liquid in step 3 is filtered and dried; a fluxing agent is added and uniformly mixed with the suspension liquid; and high temperature iglossing is carried out in a weak reduction atmosphere; and 5. a sinter is cooled to the room temperature in the reduction atmosphere, cracked to the needed granularity and washed by pure hot water, thus obtaining the green fluorescent powder of (La1-x-yCexTby) PO4 with good thermal stability; the thermal stability of the green fluorescent powder of (La1-x-yCexTby) PO4 obtained by the preparation method is good; the brightness attenuation after a technique procedure of tube baking is small; the initial optical communication of the green fluorescent powder after being prepared into a light is high; moreover, the light decay is less and the service life is long; and the invention is an excellent green fluorescent material in the backlight cold cathode lamp of an LCD.

The invention relates to the technical field of lithium battery positive electrode materials, and provides a bismuth phosphate/cerium phosphate composite lithium battery positive electrode material and a preparation method. According to the method, a hydrophobic graphene aerogel is firstly prepared through a reduction method; then, bismuth nitrate pentahydrate and cerium nitrate hexahydrate are added to a graphene aerogel dispersion, precipitates produced by bismuth salt and cerium salt hydrolysis are adsorbed in micropores of the graphene aerogel, a diammonium hydrogen phosphate solution is then added and a hydrothermal reaction is carried out, and a graphene aerogel-loaded bismuth phosphate/cerium phosphate composite material is prepared. According to the preparation method provided in the invention, the cycle performance of the bismuth phosphate positive electrode material is improved through doping of cerium phosphate, and through load of the graphene aerogel, the conductivity of the bismuth phosphate positive electrode material is improved.

The invention provides an acid-resistant Ce-P-Co catalyst and a preparation method thereof, and an application for the acid-resistant Ce-P-Co catalyst in synthesis of gamma-valerolactone. The catalystis a composite material composed of two components namely cerium phosphate and dicobalt phosphide in a molar ratio of 0.02 to 0.50. The preparation method comprises the following steps: preparing a mixed solution of cobalt salt and cerium salt, placing the mixed solution into a stirrer until the mixed solution is uniformly mixed, dropping a prepared monohydrogen phosphate solution B into the mixed solution, continuing stirring for 1 h, then transferring an obtained mixed solution into a polytetrafluoroethylene hydrothermal reaction kettle, and carrying out a reaction at 200 DEG C for 24 h; and after the reaction is completed, carrying out centrifuging so as to filter out a solid matter, carrying out washing, then carrying out drying at 75 DEG C, and carrying out high-temperature programmed treatment for 3 h in a hydrogen atmosphere at 800 DEG C. The acid-resistant Ce-P-Co catalyst provided by the invention has the advantages of low cost, simple synthetic method, environmentally-friendly process, and convenience in scale preparation and application. According to the invention, levulinic acid is converted into the gamma-valerolactone by hydrogenation, so the rate catalysis is rapid;conditions are relatively mild; the yield of the gamma-valerolactone can be up to 98%; and the catalyst is acid-resistant and can be recycled and stably used.

The invention discloses a preparation method of a high-elasticity flame-retarding wood-plastic packaging material. The preparation method comprises the following steps: crushing plant fibers and carbon fibers into powder, and carrying out surface organic modification; mixing aluminum silicate, polyvinyl chloride, polypropylene, polybutylene succinate and tributyl phosphate, adding into a blending machine and stirring and reacting for 20min to 40min; extruding an obtained mixture through an extruder, and granulating in a granulating machine; adding cerium phosphate, linalool and polyphenylene sulfide fibers, and carrying out ultrasonic reaction for 30min to 40min; filtering and drying to obtain grains; putting the grains into a mold, and carrying out film pressing and molding to obtain the high-elasticity flame-retarding wood-plastic packaging material.

The invention discloses a long-acting tailing passivator capable of being cured at normal temperature as well as a preparation method and application of the long-acting tailing passivator. According to the invention, epoxy silane is taken as a main body, aliphatic polyamine is taken as a curing agent, organic cerous phosphate is taken as a repairing agent, the surface of pyrite is coated and passivated through an impregnation method, curing is carried out at normal temperature, and a passive film can inhibit tailing oxidation for a long time. Normal-temperature curing of the passive film is achieved through chemical reaction curing, and the operation and cost problems caused by high-temperature curing in the industry are avoided; the repairing agent with a simple preparation process can repair a locally damaged passivation film under the stimulation of acid and alkali, endows the passivation film with a self-repairing function, improves the effect, reduces the cost, enhances the long-acting passivation performance, and reduces the application frequency of the passivator. The tailing passivator disclosed by the invention has the characteristics of good passivation performance, good long-term effect and the like, avoids the defects of complex preparation, high-temperature curing and the like, is convenient for large-scale industrial production and application of tailing pollution treatment, and can be applied to the field of metal mine tailing passivation.

The invention discloses a method for synthesizing monopalmitoyl glyceride. The method comprises the following steps: 1) adding palm oil and glycerol into a first reactor, fully and uniformly stirring,and preheating to the temperature of 100-120 DEG C to obtain a first mixture; 2) adding a catalyst and a phase transfer agent, heating to the temperature of 200-220 DEG C, and stirring and reacting to obtain a second mixture; 3) adjusting the pH value of the second mixture, cooling, and centrifuging and layering to obtain an upper-layer monopalmitoyl glyceride crude product; and 4) distilling themonopalmitoyl glyceride crude product to obtain the monopalmitoyl glyceride. According to the method for synthesizing the monopalmitoyl glyceride, cerium phosphate and antimony trioxide cooperativelyserve as the catalyst, tetrabutylammonium bromide and cyclodextrin are used as the phase transfer agent, the reaction conversion rate of the prepared monopalmitoyl glyceride is remarkably improved, the product purity is high, the product purity reaches 94.2% or above, the conversion rate reaches 64.2% or above, and the method has a good industrial application prospect.

The invention relates to a magnesium-calcium material and a preparation method thereof. The preparation method comprises the following steps: mixing 60-70 wt% of magnesia-calcia particles, 20-30 wt% of magnesia-calcia fine powder, 2-5 wt% of cerium phosphate and 3-6 wt% of phosphotitanate, uniformly stirring, carrying out compression molding, and naturally drying for 20-30 h; and drying for 8-16 hat the temperature of 110 DEG C, firing for 2-5 h at the temperature of 1500-1700 DEG C, and cooling to obtain the magnesium-calcium material, wherein the MgO content of the magnesia-calcia is greater than or equal to 40 wt%, the particle size of magnesia-calcia particles is 0.2-11 mm, and the particle size of the magnesia-calcia fine powder is 3-200 [mu]m; the particle size of the cerium phosphate is 3-200 [mu]m; and the content of P2O5 in the phosphotitanateis greater than or equal to 1wt%, and the content of TiO2 in the phosphotitanate is greater than or equal to 1 wt%. The method is simple in process, low in cost and environmentally friendly, and the prepared magnesium-calcium material is excellent in hydration resistance, remarkable in metal melt purification effect and suitable forpurifying refractory materials for smelting.

The invention provides a praseodymium-doped cerium phosphate up-conversion luminescent material. The material has the chemical formula of Ce1-xPO4: xPr<3+>, wherein x is in a range of 0.002 to 0.03. According to the photoluminescence spectrum of the praseodymium-doped cerium phosphate up-conversion luminescent material, the excitation wavelength of the material is 578 nm, transition radiation of Pr3+ ions from 3P0 to 3H4 in the region of 483-nm wavelength leads to formation of luminescent peaks, so the material can be used as a blue-light emitting material. The invention also provides a preparation method for the praseodymium-doped cerium phosphate up-conversion luminescent material and an organic light emitting diode using the praseodymium-doped cerium phosphate up-conversion luminescent material.

The invention discloses a preparation method of a high-temperature-resistant fireproof bushing for a cable. The preparation method comprises the following steps: modifying illite mineral powder with asilane coupling agent KH-590 to obtain a material A; carrying out a reaction by using 2-propenylphenol, 5-fluoro-2-benzidine, paraformaldehyde and 1,4-dioxane as raw materials to obtain a material B;uniformly mixing the material A, the material B and tetrahydrofuran, adding benzoin dimethyl ether, and reacting under ultraviolet light to obtain a material C; spraying a samarium nitrate aqueous solution on the surface of the material C to obtain modified illite mineral powder; preparing a coating material from a polyurethane prepolymer, aldehyde ketone resin, dimethyl silicone oil, epoxy resin, a chain extender, a cross-linking agent, glass fibers, silica micro-powder, cerium phosphate, nano titanium dioxide, modified illite powder, a flame retardant and an auxiliary agent; coating a silicone rubber tube with the coating material to form a first coating layer; weaving glass fibers on the first coating layer to form a glass fiber weaving layer; and coating the glass fiber weaving layerwith the coating material to form a second coating layer.

The invention relates to a preparation method of high-purity nano cerium phosphate powder, which comprises the following steps: (1) taking cerium carbonate, basic cerium carbonate or cerium hydroxide,adding into deionized water or deionized water containing a dispersing agent, and stirring to obtain a cerium-containing suspension, (2) preparing a phosphoric acid solution, adding nitric acid or hydrochloric acid into the phosphoric acid solution, and adding hydrogen peroxide or ascorbic acid to obtain a phosphoric acid solution containing hydrogen peroxide or ascorbic acid, and (3) adding thecerium-containing suspension into a phosphoric acid solution containing hydrogen peroxide or ascorbic acid for reaction, and after the reaction is finished, filtering, washing and drying precipitatesto obtain cerium phosphate powder. The purity of the high-purity nano cerium phosphate prepared by the method is greater than 99.995%, the dispersity is good, and the primary particle size of the high-purity nano cerium phosphate is spherical-like powder of 100nm-500nm.

The invention provides a LaPO ₄ The invention relates to a Ce-coated calcium strontium aluminum europium composite luminescent material and a preparation method and application thereof, belonging to the technical field of luminescent materials. LaPO of the present invention ₄ :Ce coated calcium strontium aluminum europium composite luminescent material including Ca _0.49 Sr _0.49 Al ₂ o ₄ :Eu _0.02 and coated on the Ca _0.49 Sr _0.49 Al ₂ o ₄ :Eu _0.02 Lanthanum cerium phosphate complexes on the surface. The present invention uses lanthanum cerium phosphate complex to coat Ca _0.49 Sr _0.49 Al ₂ o ₄ :Eu _0.02 , LaPO ₄ : The composite material after Ce doping can absorb ultraviolet light, and can _0.49 Sr _0.49 Al ₂ o ₄ :Eu _0.02 The corresponding spectrum is emitted in the absorption spectrum range, so as to achieve the effect of spectrum adjustment.