779results about "Cerium oxides/hydroxides" patented technology

The invention discloses a method for preparing nano cerium oxide through supergravity reinforcement, which comprises the following steps: 1) completely dissolving cerium chloride hexahydrate serving as a cerium source with deionized water to prepare a cerium chloride solution; (2) inputting the cerium chloride solution into a supergravity reactor through a peristaltic pump at normal temperature, then inputting ammonia water into the supergravity reactor through a constant-flux pump, and carrying out premixing reaction in the supergravity reactor to form mixed slurry; and 3) after the premixing reaction is finished, taking out the mixed slurry, and carrying out suction filtration, washing, drying and high-temperature oxidation calcination to obtain the nano cerium oxide. According to the method, the production efficiency can be improved, the particle size of the prepared nano cerium oxide is small, the particle size distribution is narrowed, and the crystallinity of crystals is improved.

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention relates to cerium oxide-based polishing powder and a preparation method thereof, a polishing solution and application, the cerium oxide-based polishing powder comprises porous secondary particles assembled by a plurality of primary crystal grains, the primary crystal grain aperture is 2-30 nm, the pore volume is 0.10-0.50 cm < 3 > / g, the specific surface area is 10-80 m < 2 > / g, and the content of surface trivalent cerium accounts for 10-40% of the total surface cerium content. The microstructure of the cerium oxide-based polishing powder is porous cerium oxide-based particles assembled by nano primary particles, and the self-assembly structure enables the cerium oxide-based polishing powder to have higher specific surface area while having higher surface trivalent cerium content, so that higher polishing rate can be obtained; due to the submicron particle size, the dispersity of the polishing slurry is improved; the Young modulus of the polishing powder is reduced due to the porous structure, so that the polishing powder is not easy to break in the polishing process, the surface precision of a polished workpiece is improved, and the service life of the polishing powder is prolonged. Therefore, the cerium oxide-based polishing powder provided by the invention has excellent polishing rate and polishing precision at the same time, and has relatively long service life.

The invention discloses a methyl paraoxon pesticide detection test strip based on oxygen vacancy-cerium dioxide and a preparation method of the methyl paraoxon pesticide detection test strip, and belongs to the technical field of biosensors. The test strip is characterized in that a large amount of oxygen vacancy-cerium dioxide is loaded. The oxygen vacancy-cerium dioxide nano enzyme can show simulated phosphatase activity under specific conditions, and the enzyme activity can cut off P-O and P-S bonds of organophosphorus pesticides and promote methyl paraoxon to be hydrolyzed into a yellow product p-nitrophenol. The detection limit of a nano-enzyme system is discussed, so that the portable visual quantitative detection of the paraoxon methyl pesticide is realized. The test strip established on the basis of the principle can quickly detect paraoxon methyl, has the advantages of simplicity and convenience in operation, high sensitivity, low cost and the like, and provides a new method for instant test of paraoxon methyl pesticide.

The invention discloses preparation of a high-uniformity cerium oxide abrasive material and application of the high-uniformity cerium oxide abrasive material in a chemical mechanical polishing solution. According to a method, cerium nitrate or cerium oxalate is used as a cerium source, a cationic or nonionic surfactant is used as a structure-directing agent, and the high-uniformity cerium oxide abrasive material is prepared in a mixed solvent system formed by water and isopropanol or water and diethylene glycol according to a specific volume ratio. The preparation method comprises the following steps: regulating the particle size and the morphology structure through a solvothermal reaction, carrying out cleaning, drying and high-temperature calcination treatment on a reaction product to obtain sphere-like cerium oxide nano-particles with high particle size concentration ratio, moderate surface roughness and good dispersity, adding cerium oxide powder into deionized water, and carrying out ultrasonic dispersion to obtain the spherical cerium oxide nano-particles. And sequentially adding a dispersing agent and amino acid while stirring, uniformly stirring, fixing the volume, and adding a pH regulator to enable the solution to be weakly acidic, thereby obtaining the chemical mechanical polishing solution. The cerium oxide submicron powder which is different in surface appearance, particle size and distribution uniformity is prepared by adjusting the solvent ratio and other reaction conditions.

The invention provides a method for synthesizing octahedral nano cerium oxide with a high Ce < 3 + > ratio and a chemical mechanical polishing solution, the polishing solution takes the synthesized octahedral cerium oxide as a grinding material, and the octahedral cerium oxide is prepared by the following specific steps: dissolving a certain amount of organic ligand and cerous nitrate in deionized water; controlling the ratio of the organic ligand to cerous nitrate to water to be (0.01-0.5): 1: (100-300), and stirring for 1-2 hours in a nitrogen atmosphere; dropwise adding a certain amount of alkali liquor into the solution at a certain speed in a nitrogen atmosphere, carrying out hydrothermal treatment on the mixture, controlling the reaction temperature to be 80-150 DEG C and the synthesis time to be 6-8 hours, centrifuging, drying and calcining the mixture after the reaction, calcining at the calcining temperature to be 400-600 DEG C and calcining for 4-8 hours, thereby obtaining the catalyst. The particle size of the octahedral nano cerium oxide is about 30-50nm, and the Ce < 3 + > ratio of the octahedral nano cerium oxide is high. The polishing solution taking the octahedral nano cerium oxide prepared by the method as the abrasive material has good dispersity and stability, high polishing rate and low surface roughness, and has wide popularization and application values.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the sphere-like cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 8-10, and carrying out sol-gel reaction to obtain sphere-like cerium dioxide sol; and (3) carrying out post-treatment on the sphere-like cerium dioxide sol to obtain the sphere-like cerium dioxide. According to the preparation method of the sphere-like cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the sphere-like cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

The invention relates to a two-dimensional nano heterojunction with space-time antibacterial and anti-inflammatory functions and a preparation method and application thereof, and belongs to the field of biomedical materials. The preparation method comprises the following steps: firstly, generating a BiCuSeO nanosheet, and resuspending the BiCuSeO nanosheet by using deionized water; the preparation method comprises the following steps: adding cerium nitrate hexahydrate into ethylene glycol, mixing with a BiCuSeO nanosheet resuspended by deionized water, and preparing the two-dimensional nano heterojunction with space-time antibacterial and anti-inflammatory functions by taking the BiCuSeO nanosheet as a seed and the cerium nitrate hexahydrate as a raw material through a hydrothermal synthesis method. Compared with the prior art, good photo-thermal performance of the heterojunction can be utilized, near infrared is used as an external field excitation source to regulate and control the temperature difference and excite the thermoelectric performance of the heterojunction, collaborative treatment of the photo-thermal performance and the thermoelectric performance is achieved, the enhanced anti-inflammatory function of the heterojunction is combined, and the heterojunction becomes a potential application material for infectious bone defects. The preparation method is simple, stable in condition and high in repeatability.

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention belongs to the technical field of rare earth thermal spraying, and particularly relates to spherical yttrium oxide powder for thermal spraying and a preparation method of the spherical yttrium oxide powder. The preparation method comprises the following steps: dissolving a yttrium oxide raw material with nitric acid to obtain a yttrium nitrate solution; sequentially carrying out parallel flow reaction, aging, washing and filtering on part of the yttrium nitrate solution and ammonia water to obtain yttrium hydroxide; sequentially carrying out parallel flow reaction, aging, washing and filtering on the residual yttrium nitrate solution and the mixed precipitant to obtain alkaline mixed yttrium; the preparation method comprises the following steps: mixing yttrium hydroxide and alkaline mixed yttrium with water, then adding a dispersing agent and an adhesive step by step, stirring, and carrying out spray granulation to obtain granulated powder; roasting the granulated powder, adding water, carrying out ball milling, then adding the dispersing agent and the adhesive step by step again, and carrying out secondary spray granulation to obtain secondary granulated powder; and sintering the secondary granulation powder at high temperature, and screening. The spherical yttrium oxide powder obtained through the method is high in absolute purity, high in balling rate, good in fluidity, high in apparent density and low in porosity.

The inorganic particle according to the present invention is composed of aggregation of crystalline and amorphous small particles and has a spherical and smooth surface. The spherical appearance, low crystallinity and narrow particle size distribution of inorganic particle are more advantageous in reducing scratch defects in the CMP process. In addition, since the small particles on the surface of the inorganic particle provide more active sites, the inorganic particle has an excellent removal rate, so it is advantageous as a next-generation CMP abrasive.

The invention discloses a preparation method of monodisperse nano cerium oxide, and relates to the technical field of rare earth materials. The preparation method of the nano cerium oxide comprises the following steps: S1, adding hydrogen peroxide and a surfactant into a cerium salt solution, and uniformly stirring and mixing to obtain a pre-solution; s2, the pre-solution is adjusted to be in an alkaline environment through an alkaline solution, stirring is conducted for 0.5-1.5 h at the temperature of 60-90 DEG C, slurry is obtained, then suction filtration, washing, drying and calcination are conducted, and cerium oxide powder is obtained. The prepared nano cerium oxide particles are small in particle size, narrow in particle size distribution range and good in dispersity.

A particulate oxide composition comprising cerium oxide, trivalent dopant, and optional additional metal oxide, other than cerium oxide and trivalent dopant, is beneficial to aid in the removal of biological contaminants, such as bacteria, viruses, fungi, protozoa (e.g., amoebae), yeast and algae. This particulate oxide composition contains more cerium oxide than trivalent dopant and has a unique depth profile in which the average trivalent dopant to Ce ratio at about 0 nm to about 3.5 nm from the surface of the particulate composition is greater than the trivalent dopant to Ce ratio at about 15 nm from the surface of the particulate composition. These trivalent doped cerium oxide compositions can be used to remove these biological contaminants from fluids, including air and water, and from solid surfaces. Also described are methods of using compositions containing these trivalent doped cerium oxide compositions to remove biological contaminants.

The invention relates to sphere-like doped cerium dioxide and a preparation method and application thereof.The preparation method comprises the following steps that cerium salt, doped metal salt, a solvent, an acid reagent and a precipitator are mixed and then subjected to a hydrothermal reaction, precipitates are obtained, the precipitates are calcined, and the sphere-like doped cerium dioxide is obtained. The doped metal salt comprises praseodymium salt and / or neodymium salt. According to the preparation method, cerium salt and praseodymium salt and / or neodymium salt serving as doped metal salt serve as raw materials, through the mixing process of the raw materials, the acidic reagent and the precipitant and the design of the reaction process, preparation of sphere-like doped type cerium dioxide is achieved, the doped type cerium dioxide of nano-scale particles is obtained, and in addition, the preparation method has the advantages that the preparation process is simple, and the preparation cost is low. In addition, the preparation method adopted by the invention is simple and convenient in process and short in reaction time, and can be used for large-scale production.

The invention discloses a nano cerium oxide synthesis method which comprises the following steps: preparing a reaction solution; performing ultrasonic reaction; carrying out aging treatment; centrifugally washing; drying and calcining; the cerium salt solution is prepared from soluble cerium salt, and the concentration of the cerium salt solution is 0.01 mol / L to 1 mol / L; the precipitant solution is one or more of ammonia water, a sodium hydroxide solution, a sodium carbonate solution and a sodium bicarbonate solution, and the concentration of the precipitant solution is 0.2 mol / L-8 mol / L; the ultrasonic power of the ultrasonic microreactor is 10W to 1000W; the calcining temperature ranges from 400 DEG C to 1000 DEG C. The nano cerium oxide with less agglomeration, controllable particle size, uniform size and adjustable morphology is obtained on the basis of super-strong mixing and crystallization promoting capabilities of the ultrasonic microreactor. Meanwhile, the method is simple and convenient to operate, easy to amplify and convenient for industrial production.

The invention discloses an oxide-coated ion-doped sodium ferric sulfate positive electrode material as well as a preparation method and application thereof. The positive electrode material is formed by compounding a sodium ferric sulfate bulk phase material doped with various valence metal cations and anions and coated with carbon similar to a positive temperature coefficient thermosensitive metal oxide. Wherein the metal cations with various valence states are doped on Na or Na / Fe ion sites of the sodium ferric sulfate, the doped anions occupy part of three-dimensional S-O tetrahedron positions, the inorganic carbon in the carbon compound is uniformly distributed in the sodium ferric sulfate bulk phase material, and the organic carbon is uniformly distributed outside the sodium ferric sulfate bulk phase material. The positive electrode plate assembled battery prepared from the positive electrode material has the advantages of high reversible charge-discharge capacity, excellent cycle performance and rate capability and high electron and ion migration rate in a low-temperature environment. The method is low in raw material cost, simple in synthesis method, short in production period and suitable for large-scale continuous production.

The invention discloses a method for preparing metal oxide nano powder by a molten salt quenching method. The method comprises the following steps: firstly, heating a reaction system to enable precursor salt to be in a molten state; adding metal source salt into a reaction system and reacting for a period of time; taking out a reaction system and quenching in liquid; cooling the product to room temperature, centrifugally cleaning, and thoroughly drying to obtain a metal oxide nano powder material; wherein the mass ratio of the precursor salt to the metal source salt is (100-0.5): 1. According to the method disclosed by the invention, the metal oxide nano powder with various morphologies and sizes can be prepared, and the morphologies and the sizes of the metal oxide nano powder can be regulated and controlled through the ratio of precursor salt to metal source salt, the ratio of quenching liquid, the reaction temperature and the reaction time. The prepared metal oxide nano powder is applied to the fields of energy and environment such as catalysis, energy storage, degradation, ion exchange, desulfurization and denitrification and the like, the production process is simple, convenient and feasible, complex special equipment is not needed, and industrial production is easy to realize.

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

The invention relates to the technical field of positive electrode materials, in particular to a preparation method of a cerium-tungsten composite modified core-shell lithium-rich manganese-based positive electrode material, which comprises the following steps: mixing a quaternary manganese-rich precursor and a lithium salt, sintering at a high temperature, cooling, crushing and sieving to obtain a primary sintered matrix; the method comprises the following steps: mixing a sintering matrix with a coating agent, sintering and modifying, and cooling, sieving and demagnetizing to obtain the cerium-tungsten composite modified core-shell lithium-rich manganese-based positive electrode material, the quaternary manganese-rich precursor is of a core-shell structure and is selected from at least one of a manganese-nickel-cobalt-aluminum quaternary precursor, a manganese-nickel-cobalt-tungsten quaternary precursor, a manganese-nickel-cobalt-zirconium quaternary precursor, a manganese-nickel-cobalt-magnesium quaternary precursor and a manganese-nickel-cobalt-titanium quaternary precursor; by adopting the quaternary manganese-rich precursor and adding the coating agent to the primary sintering matrix for modification, the obtained positive electrode material has obviously improved first charge-discharge specific capacity and rate capability, and the preparation process is simple and easy to popularize and implement.

The invention discloses a preparation method of a wear-resistant magnetic composite nano ferroferric oxide material, and belongs to the technical field of nano ferroferric oxide materials.The preparation method comprises the steps that coated modified ferroferric oxide composite powder, silver nitrate and absolute methanol are added into a reaction kettle, stirring and ultrasonic dispersion are conducted, then 2-aminoterephthalic acid is added, stirring and mixing are conducted, and a mixture is obtained; and after the reaction, separating to obtain the wear-resistant magnetic composite nano ferroferric oxide material. The wear-resistant magnetic composite nano ferroferric oxide material prepared by the preparation method disclosed by the invention overcomes the problem that an existing ferrite material is relatively single in electromagnetic loss mechanism in the aspect of nickel-phosphorus plated fabric, and the electromagnetic shielding effectiveness of the fabric is improved; the coated modified ferroferric oxide composite powder has good dispersity, a polydopamine coating layer on the surface of the coated modified ferroferric oxide composite powder improves the anchoring effect on silver MOF particles through a mussel-like adhesion interface, meanwhile, stress is dispersed and crack propagation is reduced through the buffering effect of the polydopamine coating layer, and the mechanical stability of the wear-resistant magnetic composite nano ferroferric oxide material is improved.

The invention discloses an Au (at) CeO2 material based on MOF derivation and a preparation method and application thereof, a Ce-based MOFs material (Ce-UiO-66) which is easy to synthesize, low in cost and high in selectivity and quick in response to H2S gas is designed and synthesized, the Ce-based MOFs material serves as a precursor, Au is loaded on the surface of the Ce-UiO-66 material, then heating treatment is conducted, Ce-UiO-66 is converted into a CeO2 material, and the CeO2 material is prepared. Meanwhile, the MOF is tightly combined with Au nanoparticles, so that the Au-coated CeO2 material derived based on the MOF is obtained. According to the invention, the MOF-derived Au-coated CeO2 material is used as a gas sensitive material for preparing a gas sensor for detecting H2S gas, the gas sensor shows high response speed and relatively high sensitivity, and the detection limit is as low as 5ppb.

The invention discloses a preparation method of polyhedral cerium oxide nanoparticles, which comprises the following steps: preparing a cerium salt solution, preparing a precipitator solution, preparing an additive solution, respectively keeping stirring and bubbling by using gas; uniformly mixing the cerium salt solution, the precipitant solution and the additive solution, keeping stirring and bubbling with gas to obtain a mixed solution; and reacting the mixed solution, centrifuging, washing, drying and roasting to obtain the polyhedral cerium oxide nanoparticles. The invention also provides the polyhedral cerium oxide nanoparticles and application thereof. According to the preparation method of the polyhedral cerium oxide nano-particles, one-step synthesis is performed by adopting a hydrothermal method, the required raw materials are easy to purchase and non-toxic, the preparation process is simple, the production cost is low, and the particle size distribution of the synthesized cerium oxide is uniform and can be controlled to be 100-200nm. The proper particle size is beneficial to keeping high dispersion of the polishing solution and increasing the polishing rate in the polishing process.

The invention provides a functional rare earth growth factor and a preparation method and application thereof, the rare earth growth factor comprises PEG-MoS2 and nano cerium oxide particles CeO2-NPs in a mass ratio of 1: (0.2-5), the PEG-MoS2 is a solid phase material with the surface modified with PEG, and the solid phase material is MoS2. The two materials of PEG-MoS2 and CeO2NPs are compounded, the rare earth growth factor obtained after compounding can effectively remove active oxygen existing in a wound, and the wound healing rate is effectively increased.

The invention discloses pure inorganic stimuli-responsive sol as well as a preparation method and application thereof, inorganic sol with stimuli-responsive performance is prepared from an inorganic nano-material with positive electricity, and the technical problem of conversion from one-dimensional inorganic nano-material sol to gel is solved. Compared with a means of providing positive electricity for the one-dimensional inorganic nano material through a modification means, the one-dimensional inorganic nano material carrying the positive electricity only needs cheap inorganic matters in cost, and the convenience and cost of the one-dimensional inorganic nano material carrying the positive electricity have qualitative changes in further processing and practical application; the adjustment of the acting force between one-dimensional inorganic nano materials can be realized without replacing ligands, and the method has extremely high advantages in the aspect of realizing the sol-gel conversion capability of stimulation response. The method disclosed by the invention is relatively low in cost and simple and convenient to operate, and the prepared hydrogel not only has relatively good mechanical properties, but also has relatively good stimulation response capability, is a material capable of realizing comprehensive application, and is wide in application scene.

The invention provides a doped and coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The doped and coated lithium-rich manganese-based positive electrode material comprises a doped lithium-rich manganese-based core and a cerium oxide coating layer arranged on the surface of the doped lithium-rich manganese-based core, the doped lithium-rich manganese-based inner core comprises a lithium-rich manganese-based main body material and doping elements, and the doping elements comprise a magnesium element, a titanium element and an antimony element. The lithium-rich manganese-based positive electrode material is doped, modified and coated by using a plurality of base metal elements, and the cycle stability, the rate capability and the high-voltage performance of the positive electrode material can be remarkably improved through the synergistic effect of the plurality of elements.

The invention discloses cerium dioxide particles and a preparation method thereof, the preparation method comprises the following steps: 1) cerium salt and fluxing salt are mixed and ground to obtain initial mixed salt; (2) mixing and grinding the initial mixed salt and a surface additive to obtain mixed salt containing the surface additive; 3) roasting the mixed salt containing the surface additive to obtain a roasted product; 4) cleaning the roasted product, and drying the solid obtained after cleaning to obtain cerium dioxide particles; wherein the molar ratio of the cerium salt to the fluxing salt is less than or equal to 1: 3; no additional solvent is added in the step 1), the step 2) and the step 3). According to the preparation method disclosed by the invention, the fluxing salt is adopted as an auxiliary agent for reaction, no extra solvent is added, alkali is not needed to be added for preparing a precursor, and the generation amount of waste liquid can be reduced while the cerium dioxide with good dispersity, narrow particle size distribution and average particle size less than or equal to 130nm can be obtained.

The invention aims to provide a preparation method and application of a catalyst containing vacancy cluster ultrathin CeO2 nanosheets, and belongs to the technical field of catalyst preparation.The preparation method comprises the steps that cerium nitrate hexahydrate is used as a cerium source, pyromellitic acid is used as a ligand, deionized water is used as a solvent, polyvinylpyrrolidone is used as a surface active agent, and the vacancy cluster ultrathin CeO2 nanosheets are prepared; preparing a two-dimensional Ce-MOFs precursor at 70 DEG C by adopting a simple hydrothermal method; secondly, the two-dimensional Ce-MOFs precursor is roasted for 5 h in the air atmosphere, and the vacancy cluster ultrathin CeO2 nanosheet containing catalyst is obtained. The catalyst containing the vacancy cluster ultrathin CeO2 nanosheets has a remarkable influence on the activity of catalyzing CO2 / CH3OH to prepare dimethyl carbonate, and a new research idea is provided for preparation of an efficient cerium-based catalyst and synthesis of dimethyl carbonate.

The invention discloses a preparation method of a nano-porous CeO2 catalyst, and the preparation method of the nano-porous CeO2 catalyst comprises the following steps: S1, adding a cerium source into deionized water, and dissolving to obtain a cerium-containing aqueous solution; s2, adding a mixed solvent into the obtained cerium-containing aqueous solution, and uniformly stirring to obtain a mixed solution; s3, putting the obtained mixed solution into a reaction kettle for hydrothermal reaction, after the reaction is finished, centrifugally washing to obtain a solid substance, and then sequentially drying, conventionally grinding and calcining the obtained solid substance at high temperature to obtain the nano-porous CeO2 catalyst. The invention also provides a nano-porous CeO2 catalyst, and an application of the nano-porous CeO2 catalyst. Compared with the prior art, the preparation method of the nano-porous CeO2 catalyst has the advantages that the operation is simple, and the prepared nano-porous CeO2 catalyst has a good catalytic conversion effect on VOCs (Volatile Organic Compounds) and the like.

The invention discloses zwitterion co-doped CeO2 abrasive particles and a preparation method and application thereof.The preparation method includes the steps that a cerium source and a soluble carbonate precipitator are subjected to an aging reaction to obtain a cerium-based precursor, and the cerium-based precursor, fused salt, metal ions and a fluorinating agent are mixed and then roasted to obtain the zwitterion co-doped CeO2 abrasive particles; the synthesis method is simple, the size is controllable, the particle size distribution is uniform, and the spherical-like zwitterion co-doped CeO2 abrasive particles are obtained; the co-doped CeO2 abrasive particles have excellent photo-assisted chemical mechanical polishing performance; when the polishing solution prepared from the sphere-like co-doped CeO2 abrasive particles synthesized by the method is used for processing the surface of quartz glass, the material removal rate reaches 988.69 nm / min, and a high material removal rate is obtained due to the fact that the co-doped CeO2 abrasive particles synthesized by the two-step method shorten the forbidden bandwidth and have high chemical activity, so that the material removal rate is favorably improved.