30 results about "Inorganic chemist" patented technology

The invention discloses a preparation method of lithium aluminum deuteride and application of the lithium aluminum deuteride in drug synthesis, and belongs to the technical field of inorganic chemistry. The method comprises the following steps: suspending lithium aluminum hydride in an anhydrous organic solvent under the protection of inert gas, slowly dropwise adding a deuterated methanol solution at the low temperature of-10 DEG C to 0 DEG C, and reacting for 1-2 hours; and carrying out heating reaction, filtration, concentration, seed crystal induced low-temperature crystallization, precooling washing and drying to obtain the high-purity lithium aluminum deuteride. The method is mild in reaction condition, safe to operate and high in deuteration efficiency, the purity of the obtained product is greater than or equal to 98%, and the abundance of deuterium atoms is greater than or equal to 99.8%; the invention also discloses application of the lithium aluminum deuteride in synthesis of a key intermediate of a deuterated drug, and provides a high-quality deuterium source reducing agent and an effective synthesis path for research and development of the deuterated drug.

The present invention relates to a process for producing a solid Ziegler-Natta catalyst component in the form of solid particles having a median particle size (D50vol) of 5 to 500 μm and the process comprising steps I. providing a solution of a Group 2 metal dihalide (IUPAC, Nomenclature of Inorganic Chemistry, 2005) by dissolving a solid Group 2 metal dihalide in an alcohol mixture comprising at least a monohydric alcohol (A1) of formula ROM, where R is selected from a hydrocarbyl group of 3 to 16 C atoms and an alcohol (A2) comprising in addition to the hydroxyl group another oxygen containing functional group not being a hydroxyl group, contacting the solution of the Group 2 metal dihalide of step I with a compound in a liquid form of a transition metal of Group 4 to 10, or of a lanthanide or actinide, preferably a transition metal of Group 4 to 6 of Periodic Table (IUPAC, Nomenclature of Inorganic Chemistry, 2005), and III. recovering the solid catalyst component, wherein the amount of Group 2 metal originating from Group 2 metal dihalide constitutes 100% of the whole amount of the Group 2 metal used in the process for producing the solid Ziegler-Natta catalyst component.

The present disclosure is generally related to the fields of biology, inorganic chemistry, organic chemistry, molecular biology, enzymology, chlorinated water treatment processes and the like. More particularly, certain embodiments are related to reducing cyanuric acid concentrations in aqueous liquids, such as chlorinated swimming pool water, chlorinated hot tub water and the like.

The invention discloses a preparation process and application of ferric trichloride, and relates to the field of inorganic chemistry. In the preparation process of the ferric trichloride, the steel pickling waste liquid is firstly filtered, the pH value is adjusted, then the steel pickling waste liquid reacts with iron powder, then biochemical oxidation is carried out through a fixed bed, in-situ electrochemical chlorine circulation is carried out, and finally concentration, impurity removal and compounding with a stabilizer are carried out, so that the liquid ferric trichloride is prepared. The preparation process of the ferric trichloride has the characteristics of low energy consumption, greenness, high purity and difficulty in devitrification and hydrolysis.

The present application relates to the technical field of inorganic chemistry, and particularly relates to a method for comprehensive utilization of sodium borolite mineral resources, which comprises the following steps: taking sodium borolite as raw material, and obtaining boric acid, calcium sulfate hemihydrate and sodium nitrate through a series of coupled processing procedures in a production system, wherein the boric acid meets the quality index of superior product of the national standard boric acid product standard, the purity of the calcium sulfate hemihydrate reaches more than 99%, and the sodium nitrate meets the national standard sodium nitrate product standard. The method has the beneficial effect that the method for comprehensive utilization of sodium borolite mineral resources makes the elements such as boron, calcium, sodium and magnesium in the sodium borolite and the raw materials such as sulfuric acid, sulfate and nitric acid used in the processing enter the products as much as possible, not only makes the sodium borolite mineral resources be fully utilized, but also greatly reduces the discharge of "three wastes" in the production process.

The invention discloses a method for realizing a pure-phase doped cobaltosic oxide rapid reaction based on a cobalt chloride system, and relates to the technical field of inorganic chemistry and material chemistry, and the method comprises the following steps: uniformly distributing low-light mark arrays on the inner wall of a reaction cavity for recording the migration trend of a cobalt ion group in real time, and generating a continuous crystal phase interface drift distribution zone; and according to the spatial form of a crystal phase interface drift distribution zone, a nanotexture cracking development process is executed, lattice slippage traces are developed point by point on an ion migration path, the starting position and the ending position of lattice staggered layers are marked, and a complete staggered layer distribution diagram is constructed. According to the method, accurate regulation and control and defect self-healing of the highly-doped cobaltosic oxide structure are achieved through multi-dimensional linkage means such as low-light tracking, developing positioning, coordination blocking, slow-release repairing, thermal control rearrangement and interface traction, the phase purity, doping uniformity and electrochemical performance are remarkably improved, and the method is superior to a traditional annealing repairing method.

The present application relates to a kind of visible light catalytic adjacent wood reaction palladium / perovskite material and preparation method and application.The present application belongs to the cross field of inorganic chemistry, organic chemistry, material chemistry.The palladium / perovskite material prepared in the present application has the chemical formula Pd / CsPbBr3, wherein the particle size of CsPbBr3 is 40-300nm, the size of palladium nanoparticle is 2-5nm, the visible light absorption range of palladium / perovskite material for visible light catalytic adjacent wood reaction can be extended to 532nm, photo-generated charge is generated by visible light excitation, and visible light catalytic suzuki reaction is carried out, to produce a series of biphenyl compounds connected with different substituents.The method of the present application is simple to operate, cost-saving, and mild reaction conditions, which has important significance in the field of visible light catalytic suzuki reaction technology.

The application discloses a kind of twin ZSM-5 molecular sieve and synthesis method thereof, belong to inorganic chemistry technical field.The twin ZSM-5 molecular sieve is covered by the (010) crystal surface of one coffin-shaped ZSM-5 to the (100) crystal surface of another coffin-shaped ZSM-5, so that the molecular sieve surface has higher straight channel exposure ratio.Preparation process includes: (i) water, sodium hydroxide, aluminum source, template agent, silicon source are mixed and stirred to obtain synthesis gel A;(ii) three kinds of molecular sieves MCM-35, MOR, MCM-22 are added to alkaline environment according to the ratio of 1:2:4, and alkaline heat treatment is carried out to obtain mixture B containing "mfi, mor, mel" three kinds of structural units;(iii) A, B are mixed according to the water content of 1:1, and ZSM-5 molecular sieve product is obtained by hydrothermal crystallization.For the "primary aromatic hydrocarbon mixture" obtained after benzene, toluene, p-xylene are separated from the aromatic hydrocarbon mixture obtained by petroleum and non-petroleum route, twin ZSM-5 molecular sieve shows enhanced selectivity to o-xylene and m-xylene due to higher "straight channel exposure ratio" on the surface.

FIELD: inorganic chemistry.SUBSTANCE: invention can be used in magnetic, optical, magneto-optical, X-ray and resonance studies, as well as in new generation synchrotron technologies. A charge is prepared comprising, by wt.%: (Fe2O3 + Ga2O3) 4.9; B2O3 58.3; PbO 25.0; PbF2 11.8. The prepared charge is melted in small portions into a platinum crucible at 870 °C, which is then placed in the gradient-free zone of the growth furnace and heated for melting to 900 °C for 4 hours. A platinum crystal holder is lowered into the resulting melt solution, rotating it at a speed of 20-60 rpm, and homogenized at this temperature, holding for 20-24 hours. After this, temperature surges are carried out cyclically, consisting of rapid cooling with holding and heating with holding. During the first and second cycles of temperature surges, the temperature is sharply reduced to 800-820 °C for 20 minutes and maintain at this temperature for 2-4 hours, then heat to 900 °C for 20 minutes and maintained at this temperature for 4-12 hours. In the third cycle, the temperature is sharply reduced to 800-810 °C for 20 minutes and kept at this temperature for 2-3 hours, then heated to 830-835 °C in 20 minutes and maintained at this temperature for 3-4 hours. After the specified temperature changes, the temperature is sharply reduced in 15 minutes to 805-810 °C and isothermal holding is carried out for 0.5-1 hour, during which the rotation of the crystal holder is turned off. Then smooth cooling is carried out at a rate of 0.1-0.3 °C / h up to 780 °C, the synthesized crystals are released from the crucible by smoothly removing the crystal holder from it at a speed of 0.5 cm / min. Final cooling of the furnace is carried out for 4-6 hours to a temperature of 500 °C with subsequent shutdown. The invention makes it possible to grow single crystals of Fe1-xGaxBO3, where 0≤x<0.2, in the form of plates up to 5 mm in diameter.EFFECT: improved performance.1 cl, 2 dwg, 3 ex

The invention discloses a method and a system for preparing high-purity lithium sulfide based on a mechanochemistry principle, and belongs to the field of inorganic chemistry and battery materials. According to the method, mechanical force is applied to lithium hydride, a sulfur source and a lithium source compound, and self-propagating exothermic reaction is triggered and maintained to generate lithium sulfide; the system comprises a reaction cavity, a mechanical force generation mechanism, a control module and an integrated gas treatment device. The core of the method is that through systematic integration and cooperation of three technical dimensions of mechanical force triggering, closed-loop control and in-situ purification, fundamental reconstruction from an energy utilization mode to a product purification path is realized. Compared with the prior art, the method has the advantages that the production energy consumption and the purification cost are expected to be greatly reduced, the raw material adaptability is wide, and a subversive technical path is provided for low-cost and large-scale production of the ultra-high-purity lithium sulfide.

The present invention proposes a compound monohydrate monoboric acid dihydroxy decaborate dilead nonlinear optical crystal and its preparation method and application, belonging to the field of inorganic chemistry technology. The chemical formula of the crystal is Pb2B 10 O 16 (OH)2·B(OH)3·H2O, with a molecular weight of 892.35, belongs to the monoclinic crystal system, P21, and is grown in a closed system using a hydrothermal method or in an open system using a room temperature solution method. During the preparation process, the crystals grow easily and become transparent and unwrapped, with the advantages of fast growth rate, low cost, and easy acquisition of large-sized crystals. The obtained crystals have the advantages of light transmission band reaching the deep ultraviolet region, stable physical and chemical properties, non-deliquescent, easy processing and storage, and can be further used to prepare frequency doubling generators, up or down frequency converters, and optical parametric oscillators.

The application belongs to the technical field of inorganic chemistry, material chemistry and photoresist, and particularly relates to a kind of heterojunction type crystalline metal oxygen cluster patterning material and its preparation method and application, the patterning material is molecular heterojunction, the molecular heterojunction contains metal ions with radiation sensitive ligand, the metal ions are radiation sensitive elements, and the radiation sensitive ligand refers to a structure containing double bond, triple bond, epoxy propane or halogenated hydrocarbon.The resolution of the pattern formed by the coating formed by the spin coating of the patterning material dissolved in solvent and subjected to exposure and development can reach 100 nm, or even 50 nm.

The invention belongs to the field of inorganic chemistry and the field of nonlinear optical materials, particularly provides a niobium oxytellurite sulfate second-order nonlinear optical crystal and a preparation method thereof, and aims to solve the problem that an existing tetrahedron-based nonlinear optical crystal material is small in birefringence and / or relatively weak in nonlinear optical response. The chemical formula of niobium oxytellurite sulfate is Nb2O2 (TeO3) 2 (SO4), the crystal structure is a non-centrosymmetric structure and belongs to a monoclinic system, and the space group is Cc; the crystal material has a moderate frequency-doubled effect and can realize phase matching; meanwhile, the material shows a remarkable birefringence characteristic, has a relatively wide ultraviolet transmission window and relatively high stability, and has a wide application prospect in the fields of laser frequency conversion, photoelectric modulation, laser signal holographic storage and the like; in addition, the niobium oxytellurite sulfate crystal material can be prepared by a hydrothermal method, and is simple in process, mild in preparation condition and easy to implement.

1. Name of the designed product: chemical balance (inorganic chemistry). 2. Use of the designed product: weighing of chemical supplies during experiments. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The invention provides a metal organic framework material with a function of separating and purifying ethylene from a propylene-ethylene mixture as well as a preparation method and application of the metal organic framework material, and relates to the scientific field of material chemistry and inorganic chemistry. The chemical formula of the metal organic framework material is [Zn5 (mu3-OH) (TPHC) 1.5 (H2O) 4], in the formula, TPHC is a deprotonated (1, 1 ': 3', 1 ''-terphenyl) 3, 3 ', 4', 5, 5 ', 6'-hexacarboxylic acid ligand, and mu3-OH represents a hydroxyl ligand bridged over one another. The invention also discloses a preparation method of the metal organic framework material and application of the metal organic framework material in separation and purification of a propylene-ethylene mixture. The method has the advantages of easily available raw materials, simple synthesis steps, low equipment requirements and short material synthesis time. The prepared metal organic framework is a three-dimensional porous framework material containing a cage structure, the porosity is 52.1%, and the Langmuir specific surface area is 392.1 m < 2 > g <-1 >. The adsorption capacity and the adsorption acting force of the metal organic framework material to ethylene are obviously lower than those of propylene, so that the metal organic framework material has a potential application prospect in the aspect of efficient adsorption separation of a propylene-ethylene mixture.

The present application relates to inorganic chemistry and catalytic chemistry technical fields, disclose a kind of tin titanium silicon molecular sieve supported gold nanoparticle catalyst and preparation method and propylene gas phase epoxidation method.The catalyst includes tin titanium silicon molecular sieve and gold nanoparticle supported on the tin titanium silicon molecular sieve;Wherein, with the total weight of the catalyst as benchmark, the content of the gold nanoparticle is 0.01-1 weight%;Wherein, with Au element, the proportion of 0 valence Au in the gold nanoparticle is >90%, and is obtained by XPS detection and calculation;Wherein, in the catalyst, titanium silicon molar ratio is 0.005-0.04:1, and tin silicon molar ratio is 0.005-0.04:1.The catalyst provided by the present application has higher catalytic activity when catalyzing propylene gas phase epoxidation reaction, and propylene conversion rate is increased to 10-16%, and the selectivity of propylene oxide can reach 85-95%.

The invention discloses a method for preparing a pure-phase doped ternary precursor by a spray pyrolysis method based on a chlorate system, and relates to the technical field of inorganic chemistry and material science, and the method comprises the following steps: in a spray pyrolysis temperature rise stage, continuously sampling an ion flux field containing a plurality of metal ions in the chlorate system, and establishing a metal ion migration asynchronous analysis baseline, and generating a migration-diffusion difference graph for representing the relative deviation of the metal ion migration rate. According to the method, by constructing a diffusion difference graph and a stress density spectrum and combining an electric static force field and acoustic flow regulation and control, doping and main metal migration synchronization is achieved; and through cooperation of chlorate structure reconstruction and magnetic heat, electroacoustic and photo-thermal three-field cooperative control, a reverse diffusion trap is eliminated, doping clamping is stabilized, and the phase purity and the structure consistency of the ternary precursor are improved.

The invention discloses a low-field magnetic resonance method for researching solid-liquid equilibrium, and belongs to the technical field of rare earth resource development and environmental protection, physical chemistry, inorganic chemistry and analytical testing. The method comprises the following steps: testing a paramagnetic ion solution to obtain transverse relaxation time of paramagnetic ions under different concentrations; the transverse relaxation rate is calculated; obtaining a relational graph of the paramagnetic ion concentration and the transverse relaxation rate; constructing an adsorption system, a desorption system, a dissolution system and a precipitation system; and measuring the transverse relaxation time of the four systems at different time and concentrations, quantitatively measuring the concentration of ions, and judging the adsorption-desorption relationship and the precipitation-dissolution relationship of the solid-liquid surface. According to the method, paramagnetic ions are taken as probe ions, an adsorption-desorption solid-liquid two-phase dispersion system, a precipitation-dissolution solid-liquid two-phase dispersion system and a solid-liquid interface surface are respectively constructed, a solid-liquid interface ion migration process mechanism and a distribution rule during balance are disclosed, and adsorption-desorption efficiency, a solubility product constant of precipitation and process kinetic parameters are calculated.

The application relates to the technical field of inorganic chemistry and catalytic chemistry, and discloses a titanium-silicon molecular sieve, a preparation method and application thereof, wherein the method comprises the following steps: (1) mixing a silicon source, an alkaline template agent, a titanium source and water to obtain a titanium-silicon precursor; (2) mixing the titanium-silicon precursor with an organic silicon compound shown in formula (I) to obtain a mixture; (3) microwave heating the mixture to crystallize the mixture, separating a solid from a crystallization product, and then drying and calcining the solid. In the preparation method, the titanium-silicon precursor is treated by using a specific organic silicon compound, and a microwave heating synthesis condition is used, so that a titanium-silicon molecular sieve in which almost all titanium atoms in raw materials are inserted into a molecular sieve skeleton is prepared, the selectivity and catalytic activity of the titanium-silicon molecular sieve in a catalytic reaction are improved, and the titanium-silicon molecular sieve has high selectivity and high catalytic activity.

The invention belongs to the technical field of biological inorganic chemistry, and particularly relates to an imidazolyl Schiff base acylhydrazone ligand, a preparation method of the imidazolyl Schiff base acylhydrazone ligand, an imidazolyl Schiff base acylhydrazone metal drug and application. The invention provides a brand new imidazolyl Schiff base acylhydrazone ligand, the imidazolyl Schiff base acylhydrazone ligand is N '-(5-bromo-2-hydroxybenzylidene)-4-(1-imidazole) benzoyl hydrazine, then the imidazolyl Schiff base acylhydrazone ligand is coordinated with zinc nitrate or europium nitrate, and the imidazolyl Schiff base acylhydrazone metal drug is obtained. A new ligand is obtained by adopting the method disclosed by the invention, a new drug with a clear structure, low toxicity and anticancer activity is prepared by adopting the ligand, and the technical defects of metal drugs and Schiff base drugs in the prior art are overcome.

The application discloses a preparation process of metal sulfide and application thereof, and belongs to the technical field of inorganic chemistry. The preparation process of the metal sulfide comprises the following steps: placing a sulfate raw material and a carbon powder material in a crucible, then placing the crucible in a closed reactor, replacing air in the reactor with inert gas, heating, opening a microwave generating device, gradiently increasing power, and cooling after reaction, wherein the gradiently increased power changes in a range of 4-28 kW, and the gradient interval is 6-8 kW. The preparation process of the metal sulfide has high production efficiency, mild reaction condition, small safety risk and environmental friendliness, and the prepared metal sulfide has high purity.

The invention discloses a preparation method of palladium nanoparticle-loaded mesoporous titanium dioxide with a sonodynamic effect, which is a novel nanoparticle material taking inorganic chemistry as a synthesis basis and is used for tumor treatment by utilizing the efficient catalytic activity of the palladium nanoparticle-loaded mesoporous titanium dioxide in a tumor microenvironment. Particle synthesis mainly comprises preparation of mesoporous titanium dioxide and in-situ synthesis of palladium nanoparticles, and finally a novel nanoparticle complex is formed. The specific preparation method of the nano particles comprises the following steps: 1) preparing hollow mesoporous titanium dioxide nano particles with a sonodynamic effect; (2) palladium nanoparticles are synthesized on the surfaces of the hollow mesoporous titanium dioxide nanoparticles in situ, and the finally obtained nanoparticle complex has good biocompatibility, biological safety, sonodynamic effect and excellent tumor treatment effect.

The invention belongs to the field of biological inorganic chemistry, discloses a platinum porphyrin compound PtTSPP as well as a preparation method and application thereof, and aims to solve the technical problems of poor water solubility, short emission wavelength, small Stokes shift, insufficient tumor hypoxia environment response capability and the like of the existing porphyrin compound in tumor diagnosis and treatment. The structural formula of the platinum porphyrin compound PtTSPP is shown in the specification. Porphyrin has strong hydrophilicity, fluorescence enhancement to a tumor hypoxia environment and high < 1 > O2 quantum yield. Meanwhile, good biocompatibility and photocytotoxicity to Hela cells are achieved, and excellent cell imaging capacity is achieved.

The present application relates to the technical field of inorganic chemistry and catalytic chemistry, and discloses a mixed molecular sieve supported gold nanoparticle catalyst, a preparation method thereof and a propylene gas phase epoxidation method.The catalyst comprises a carrier and gold nanoparticles supported on the carrier, and the carrier is a mixed carrier containing titanium silicalite and tin silicalite; wherein the content of the gold nanoparticles is 0.01-1% by weight based on the total weight of the catalyst; wherein the proportion of 0-valence Au in the gold nanoparticles is > 85% based on Au element; and wherein the titanium silicate molar ratio in the catalyst is 0.005-0.04:1, and the tin silicate molar ratio is 0.005-0.04:1.The catalyst provided by the present application has high catalytic activity when catalyzing the propylene gas phase epoxidation reaction, the propylene conversion rate is increased to 8-16%, and the propylene oxide selectivity can reach 85-95%.

The invention discloses a salicylaldoxime ligand modified organic tin oxygen cluster compound and a preparation method and application thereof. The salicylaldoxime ligand modified organic tin oxygen cluster compound is a zero-dimensional cluster, and a peripheral ligand of the cluster compound can be replaced by salicylaldoxime ligands with different substituent groups; the chemical general formula of the salicylaldoxime ligand modified organic tin oxygen cluster compound is [(R1Sn) 5 (mu3-O) 2 (R2O) 3L4], wherein R1 is selected from one of methyl, ethyl, propyl, butyl, phenyl or octyl; r2 is selected from one of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, phenyl or methylallyl; l is salicylaldoxime ligands with different substituent groups, and mu3 means that a coordination atom is connected with three metal atoms.

The invention relates to the technical field of inorganic chemistry and gas separation, in particular to a pyridine-carboxylic Co-MOF material as well as a preparation method and application thereof, the chemical formula of the material is Co5 (PTO) 2 (dpa) 4Co5 (PTO) 2 (dpa) 4. NS, PTO is deprotonated 4, 4 ', 4'-phosphoryl tribenzoic acid, dpa is 4, 4 '-bipyridylamine, S represents a removable solvent molecule in a pore channel, and n is a positive integer. The material has a five-core Co cluster secondary construction unit, forms a three-dimensional network structure with PTO and dpa ligands, and forms two quadrilateral microporous channels in the a-axis direction, shows high-selectivity separation capacity for CH / COmixed gas in gas adsorption separation, especially has IAST selectivity of 5.86 for equimolar mixed gas under 298K, and has the advantages that the IAST selectivity of the material to the equimolar mixed gas under 298K can reach 5.86, and the IAST selectivity of the material to the equimolar mixed gas under 298K can reach 5.86. And the method has excellent industrial application prospects.

The application relates to the technical field of inorganic chemistry and catalytic chemistry, and discloses a shaped titanium-silicon molecular sieve, a shaping method and application thereof. The method comprises the following steps: mixing a pore former and a silica sol to form a mixed solution, then mixing mixed powder of a titanium-silicon molecular sieve and an additive with the mixed solution to obtain a suspension; dropping the suspension into liquid nitrogen to obtain solid small balls, and then drying and calcining the solid small balls to obtain the shaped titanium-silicon molecular sieve. The titanium-silicon molecular sieve has both mechanical properties and catalytic activity, the anti-crushing strength is 20-100 N / cm, and the titanium-silicon molecular sieve has relatively high propylene epoxidation reaction activity; when the spherical shaped titanium-silicon molecular sieve is applied to catalyze a propylene gas phase epoxidation reaction, the propylene conversion rate is > 3%, and the propylene oxide selectivity is > 78%.

The invention discloses a method for preparing anhydrous iron phosphate by an iron method, and relates to the field of inorganic chemistry. The method comprises the steps of raw material preparation, iron melting, oxidation, hydrolysis, filtering and washing, dehydration and calcination. Specifically, an iron source reacts with phosphoric acid to generate a reaction solution containing Fe (H2PO4) 2, then ferric phosphate is formed through oxidation of hydrogen peroxide, ferric phosphate crystals are generated through hydrolysis, washing and neutralization treatment are performed, and finally dehydration and calcination are performed at high temperature to obtain anhydrous ferric phosphate. The method has the characteristics of stable process, high product purity and wide application range.

This invention relates to the fields of inorganic chemistry and catalytic chemistry, and discloses a supported catalyst and its preparation method, as well as a method for the gas-phase epoxidation of propylene. The catalyst comprises a titanium-silicon molecular sieve and gold-tin alloy nanoparticles supported on the titanium-silicon molecular sieve; wherein, based on the total weight of the catalyst, the gold content is 0.01-1 wt%, and the tin content is 0.01-1 wt%; wherein, the proportion of 0-valent Au in the gold element is >95%. The catalyst provided by this invention exhibits high catalytic activity in the gas-phase epoxidation of propylene, with a propylene conversion rate as high as 12-18% and a propylene oxide selectivity of 85-95%.

The invention belongs to the technical field of inorganic chemistry, and discloses a preparation method of high-purity nano titanium dioxide, which comprises the following steps: respectively filtering a reaction raw material TiCl4 and reaction gas, and mixing in a reactor; igniting the obtained mixture, and carrying out combustion reaction in a reaction furnace to obtain a reaction product; the obtained reaction product is input into a deacidification device, deacidification auxiliary gas which is sequentially heated and filtered is input into the deacidification device, the deacidification auxiliary gas and the reaction product are subjected to mutual hedging in the deacidification device for deacidification, and nanometer titanium dioxide is obtained; the temperature of the deacidification auxiliary gas is 450-600 DEG C; and introducing the obtained nano titanium dioxide into a demagnetizer to demagnetize, thereby obtaining the high-purity nano titanium dioxide. According to the preparation method, the content of chlorine, iron, sodium, calcium, copper, zinc, cadmium, chromium, lead and magnetic foreign matters in the nano titanium dioxide product can be effectively controlled while the nano titanium dioxide product with the anatase type crystal proportion higher than 80% is obtained.