32 results about "Anatase" patented technology

Provided is a titanium oxide powder, wherein the A / BET specific surface area is 2.3×10-5[ms-1 / (m2 / g)] or higher when calculated from the BET specific surface area and the inverse A of the spin-spin relaxation response time T2 measured by performing pulsed NMR on a liquid mixture in which the BET specific surface area measured via the nitrogen adsorption method is at least 80m2 / g and less than 300m2 / g, the anatase content of the crystal phase measured by the powder X-ray diffraction (XRD) method is 90% or more, and the titanium oxide content prepared using ion-exchanged water is 10 mass%.

A glass article comprising a photocatalytic coating including a titanium nitride layer and an outer titanium oxide layer, preferably at least partially in anatase form, said article being configured to impart a blue colour in transmission to a multiple glazing unit in which it constitutes the outer face, said multiple glazing unit further comprising a low-emissivity coating on another face of said multiple glazing unit, in particular face 2 or 3.

The application provides a method for preparing an M-phase VO2 film by a light-assisted spray pyrolysis method and the M-phase VO2 film prepared by the method, and belongs to the field of nanometer materials. The method comprises the following steps: (1) preparing a vanadium dioxide spraying liquid: adding vanadium oxyacetonylacetone into anhydrous methanol, stirring and aging to obtain a vanadium dioxide spraying liquid with ultraviolet photosensitive properties; (2) preparing a vanadium dioxide film: introducing the vanadium dioxide spraying liquid in step (1) into an atomizer and spraying onto a substrate coated with a TiO2 anatase phase under ultraviolet light irradiation to obtain the M-phase VO2 film. The method enables vanadium ions to be chelated in the sol by stirring, and the vanadium dioxide spraying liquid has ultraviolet photosensitive properties. The purity of the VO2(M) film is improved by introducing a titanium dioxide transition layer, and the microstructure of the VO2(M) film is improved by ultraviolet light irradiation, thereby improving the visual transmittance and solar light regulation rate of the VO2(M) film.

This invention provides a titanium dioxide supported catalyst with titanium vacancies, its preparation method, and its application. The preparation method includes the following steps: (1) mixing titanium dioxide raw material with a fluorine-containing etchant and performing etching treatment; separating the resulting mixture into solid and liquid components; and heat-treating the resulting solid to obtain a titanium dioxide support rich in titanium vacancies; (2) mixing an active metal precursor solution with the titanium dioxide support to load the active component; and activating the solid obtained after solid-liquid separation to obtain a titanium dioxide supported catalyst. This invention provides a simple, low-cost, and easily scalable HF etching method for preparing anatase supports rich in titanium vacancies, thereby obtaining a Pd-based catalyst that possesses ultra-high room temperature formaldehyde oxidation activity requiring only room temperature treatment.

The disclosed method for manufacturing barium titanate particles comprises: a process (i) for preparing titanium hydroxide by simultaneously neutralizing an aqueous titanium halide solution and an alkaline substance under predetermined conditions; a process (ii) for preparing a slurry of the titanium hydroxide; a process (iii) for preparing a titanium compound by adding a predetermined amount of inorganic acid and an organic acid to the slurry and then maintaining the slurry at a temperature in the range of 40 to 90°C; and a process (iv) for synthesizing barium titanate particles by hydrothermal synthesis using a raw material containing the titanium compound. The titanium compound contains amorphous titanium hydroxide and anatase-type titanium dioxide. The specific surface area of ​​the titanium compound is 250 m² / g or more.

glass article comprising a photocatalytic coating including a layer of titanium nitride and an external layer of titanium oxide, preferably partially in anatase form, said article being configured to impart a blue color in transmission to a multiple glazing in which it constitutes the front face, said multiple glazing further comprising a low-emissivity coating on another face of said multiple glazing, in particular face 2 or 3.

The application discloses a preparation method and application of high-stability lead-free halide core-shell nanocrystals and belongs to the field of semiconductor material preparation. The nanocrystal core layer is and the shell layer is an in-situ grown anatase phase / amorphous phase. Tetrabutyl titanate is used as a single titanium source, and one-step coating is carried out through precursor solution preparation-titanium source in-situ hydrolysis-anti-solvent induction-post treatment. Optionally, a chelating agent can be introduced to passivate defects, and a polymer+inorganic dense layer double-coating can be used to strengthen the stability. The oxygen-free preparation conditions are optimized, and one or mixed halogen nanocrystals can be prepared by passing nitrogen gas throughout the whole process, so that the problems of poor water oxygen and thermal stability of traditional nanocrystals are solved. In-situ coating forms an interface bonding, and the fluorescence retention rate is greater than or equal to 80% in air for three months, and the Cl / Br phase can reach greater than or equal to 90%. The process is simple and easy to scale, and the material can be widely applied to the fields of photocatalysis, flexible X-ray imaging, LED, photoelectric detection and the like, and has significant academic and industrial application values.

This invention discloses a lanthanum-doped PCN / MXene composite nanofiber, using La as the dopant element. The composite nanofiber is composed of zero-dimensional TiO₂ nanoparticles derived from MXene nanosheets, La-based species, and one-dimensional porous nitrogen-doped carbon (PCN) nanofibers. The TiO₂ nanoparticles contain anatase and rutile phases, forming a biphase TiO₂ heterostructure. The composite nanofiber exhibits a reflection loss value below -10 dB. The preparation method includes the following steps: 1. Preparation of MXene nanosheets; 2. Preparation of lanthanum-doped PCN / MXene composite nanofibers. The mass ratio of lanthanum nitrate hexahydrate to MXene nanosheets is 1:1; the mass ratio of polyacrylonitrile to MXene nanosheets is 4:1. The resulting composite nanofiber, with a matching thickness of 1.95 mm, exhibits a reflection loss value of -61.55 dB and an effective absorption bandwidth of 5.7 GHz (12.3–18.0 GHz).

This invention discloses a Ti-Mn-O composite oxide catalyst, its preparation method, and its application. The catalyst is mainly composed of Ti, Mn, and O, with the main phases including Mn₂O₃ and anatase TiO₂. The preparation method involves preparing a titanium-manganese composite dry gel precursor using a citric acid-assisted sol-gel method, followed by calcination at 350–500°C to obtain the Ti-Mn-O composite oxide catalyst. This invention also discloses the application of this catalyst in hydrogen storage: under a protective atmosphere, 2–8 wt% of the catalyst is ball-milled with MgH₂ to obtain a Ti-Mn-O / MgH₂ composite hydrogen storage material. TPD test results show that the hydrogen release temperature of this composite hydrogen storage material is significantly lower than that of undoped MgH₂, with the main hydrogen release range being 245–310°C and the total hydrogen release being 6.7–7.3 wt%. The catalyst of this invention has a simple preparation process, and the Ti and Mn components are uniformly dispersed. It can effectively improve the dehydrogenation behavior of MgH2 and reduce the hydrogen release temperature, and has good application prospects in the field of magnesium-based solid hydrogen storage materials.

The application belongs to the technical field of photocatalysis, and particularly relates to a substructure-controllable penicillium crustosum template titanium-based composite material and a preparation method and application thereof. The application uses cheap and easily obtained penicillium crustosum with high silicon content as a biological template, and uses potassium fluoride and glycerol as a regulator to realize multi-element step-by-step complex regulation of the substructure of the composite material. The addition of potassium fluoride makes K 1.28 Ti8O 16 , K2Ti6O 13 appear, and form a ternary heterojunction with anatase TiO2, so as to realize the substructure regulation of the penicillium crustosum template titanium-based composite material. The application first proposes the ternary heterojunction, and introduces the penicillium crustosum biological template with high silicon content, so that the adsorption performance and visible light catalytic performance are both optimized, and the complex structure is achieved. The composite material is used as a catalyst to degrade tetracycline under visible light, the method used is simple and convenient, is suitable for expanding the production scale, and has a good application prospect.

The application provides a TiO2 / g-C3N4 S-type heterojunction photocatalyst with a close interface, which is constructed based on a one-step in-situ thermal polymerization strategy and is used for deep purification of antibiotic wastewater under visible light driving. In the application, anatase TiO2 nanoparticles and melamine precursors are ground and uniformly mixed at a mass ratio of 4:9, calcined at 550 DEG C for 2h for in-situ thermal polymerization, a chemical bonding close heterojunction interface is constructed, and the defects of a large charge transfer resistance of a traditional physical mixing interface are solved. The composite material has a developed mesoporous structure, and the internal strong electric field and S-type charge transfer mechanism significantly improve the photocatalytic performance. Tetracycline hydrochloride can be completely degraded within 70 min under visible light, the environmental interference resistance is strong, the cycle stability is excellent, and the degradation rate is still more than 83% after 4 cycles. The method is simple in process, conforms to atomic economy, and provides a new scheme for the development of efficient heterojunction photocatalytic materials.

This invention relates to a low-loss microwave ferrite material for LTCF phase shifters and its preparation method, belonging to the field of electronic ceramic materials technology. The microwave ferrite material comprises a main material and auxiliary materials, with the auxiliary materials accounting for 0.01–2 wt.% of the main material. The main material consists of: Li₂CO₃ 11.65–12.33 mol%, ZnO 17.61–22.18 mol%, TiO₂ 8.22–13.31 mol.%, Mn₃O₄ 1.85–1.96 mol%, Fe₂O₃ 50.93–59.79 mol%, and Bi₂O₃ 0.08–0.09 mol%. The auxiliary material is rutile or anatase TiO₂ with a particle size of 5 nm–50 nm. The low-loss microwave ferrite material for LTCF phase shifters prepared by this invention, in addition to having a low sintering temperature (≤910℃), also has a narrow ferromagnetic resonance linewidth (≤90Oe) and low dielectric loss (<3×10⁻⁶). ‑4 It possesses high saturation magnetization (>3700 Gauss), high remanence ratio (>0.85), and high Curie temperature (>300℃). The fabricated microwave ferrite not only meets the requirements of LTCF process but also possesses excellent magnetic properties required for key substrate materials in microwave devices such as low-loss phase shifters.

The application discloses a preparation method and application of a TiO2 heterojunction composite photocatalytic material based on graphite phase carbon nitride in-situ growth, and belongs to the technical field of functional nanometer material preparation, solar energy utilization and environmental protection. The method directly prepares graphite phase carbon nitride material by using nitrogen-rich precursor as raw material and heat polymerization; then, rutile TiO2 is used as a titanium source, and a g-C3N4 / TiO2 ternary composite material with heterojunction and heterojunction is prepared on the g-C3N4 by using a molten salt method. The rutile / anatase TiO2 heterojunction is grown on the g-C3N4, the carrier separation between the TiO2 heterojunction and the TiO2 and g-C3N4 heterojunction interface is realized, so that the light-generated carrier separation efficiency of the composite material is significantly improved. The method is simple and feasible, the prepared material can be directly applied to photocatalytic purification of pollutants in water under sunlight, and has important application prospect.

The application discloses a method for preparing Yb-doped TiO2 photocatalyst by a high-pressure assisted sol-gel method, and Yb-doped TiO2 photocatalyst is prepared by the high-pressure assisted sol-gel method. The prepared Yb-TiO2 photocatalyst is in an anatase phase crystal form, has good crystallinity and dispersibility, has a larger specific surface area, has more active sites for surface reaction, and has a higher content of hydroxyl groups on the surface of the catalyst than that of intrinsic TiO2, so that the prepared Yb-TiO2 photocatalyst has good photocatalytic activity and stability.

This invention discloses a supported catalyst for the oxidative depolymerization of PET to prepare oxalic acid. Gold nanoparticles are supported on TiO2, which is either anatase or rutile titanium dioxide. The loading amount of gold nanoparticles is 0.1–3.0 wt.%. This invention also discloses a method for converting waste polyethylene terephthalate (PET) into oxalic acid via depolymerization catalytic oxidation. The method includes adding a supported catalyst and waste PET to an alkaline solution, using oxygen as the oxidant, and catalytically oxidizing the PET to obtain oxalic acid. This invention utilizes a supported catalyst to achieve efficient and selective oxidative depolymerization of PET in an oxygen-containing atmosphere and alkaline aqueous solution system, directionally converting it into oxalic acid. It features mild reaction conditions, no need for hydrogen, safe operation, and environmental friendliness, aligning with the development requirements of green chemistry and the circular economy, and possessing broad prospects for industrial application.

The application discloses a method for preparing a La-doped TiO2 photocatalyst by a high-pressure assisted sol-gel method, and the La-doped TiO2 photocatalyst is prepared by a high-pressure assisted sol-gel reaction method. The prepared Yb-TiO2 photocatalyst is in an anatase phase crystal form, has good crystallinity and dispersibility, has a larger specific surface area, has more active sites for surface reaction, and has a higher content of hydroxyl groups on the surface of the catalyst than that of intrinsic TiO2, so that the prepared La-TiO2 photocatalyst has good photocatalytic activity and stability. Through structural analysis of the La-TiO2 photocatalyst, it can be found that the specific surface area of the La-TiO2 is obviously larger than that of the intrinsic TiO2.

This invention relates to a catalyst for photothermal catalytic methane coupling reaction, its preparation method, and its application. The catalyst comprises a titanium dioxide support and metal particles; the titanium dioxide support has anatase phase crystal structure; the metal particles, based on 100% of the total mass of the catalyst, have a mass percentage content greater than 0 and less than or equal to 0.12 wt%; the metal element in the metal particles is selected from Pd or Pt; the metal particles are loaded onto the titanium dioxide support via photodeposition, specifically: under an inert gas atmosphere, using methanol as a sacrificial agent, photogenerated electrons are used to reduce metal ions to zero-valent metal atoms in situ, which are then deposited on reduction sites on the surface of the titanium dioxide support. This invention's catalyst, by controlling the support crystal structure and metal-support interface, achieves efficient conversion of methane to ethane under mild conditions, avoiding over-oxidation, and exhibits excellent catalytic activity and stability.

This application discloses an in-situ doped TiO2 core-shell structure powder with a wide particle size range, its preparation method, and its applications. The powder has a rutile core@anatase shell structure, with dopant elements enriched in the shell through chemical bonding. The preparation method utilizes an integrated "alkali treatment-acid treatment-low-temperature crystallization" process: rutile phase TiO2 is embedded with cation dopant via an alkaline hydrothermal reaction to form an alkali metal titanate shell; then, acid treatment replaces the anion dopant to construct a hydrotitanate shell; finally, low-temperature calcination yields the core-shell structure. This technology utilizes a dynamic surface reconstruction window to simultaneously integrate doping, overcoming particle size limitations (nanometer to centimeter scale). The resulting material exhibits highly efficient photocatalytic degradation performance of organic pollutants in water under visible light, making it suitable for engineering applications. Its innovation lies in simultaneously completing structure construction, doping integration, and crystallization, avoiding the complexity and defects of step-by-step processes, combining technological advancement with practicality.

The application discloses a kind of preparation methods of two-dimensional 1T / 2H mixed phase MoS2 / TiO2 nano composite catalyst for polycyclic aromatic hydrocarbon hydrogenation.The present application comprises the following steps:(1) the preparation of two-dimensional TiO2 nanometer material: after mixing fluorine-containing ionic liquid and water uniformly, it is added dropwise into titanium source solution, and two-dimensional anatase TiO2 nanometer sheet is obtained.(2) the preparation of 1T / 2H mixed phase MoS2 and two-dimensional TiO2 nanometer material: two-dimensional TiO2 nanometer material is dispersed in deionized water, molybdenum source, sulfur source and reducing agent are dissolved in deionized water, and after heat treatment and crystallization, the precipitate is separated out, and 1T and 2H mixed phase two-dimensional MoS2 / TiO2 nano composite catalyst is obtained after sufficient drying.The two-dimensional structure 1T / 2H-MoS2 / TiO2 nanometer material prepared by the synthesis method of the present application has the characteristics of high hydrogenation active site exposure and good high temperature and high pressure stability.

This invention discloses a chlorine-poison-resistant CO oxidation catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The chlorine-poison-resistant CO oxidation catalyst of this invention comprises anatase TiO2 support and active components supported on the support; wherein the active components include Pt, Pd, and Ru. The chlorine-poison-resistant CO oxidation catalyst of this invention achieves a space velocity of 60,000 h⁻¹. ‑1 CO concentration 10000 mg / m³ 3 Under harsh conditions containing 200 ppm HCl or 200 ppm chlorobenzene, complete CO conversion can be achieved at 165 °C, and the catalyst activity retention rate is >95% after 100 h of reaction.

The present application relates to the technical field of optical functional film material, and discloses a self-cleaning antireflection and anti-reflective film with controllable refractive index and a preparation method thereof, the preparation method comprises the following steps: S1, preparation of anatase hollow TiO2 nanoparticles; S2, preparation of a composite sol; S3, film coating and curing.The present application realizes precise controllable preparation of hollow TiO2 nanoparticles, and by controlling the template particle size, combining sol-gel coating and high-temperature calcination process, anatase hollow TiO2 nanoparticles with adjustable particle size are prepared, solving the problems of wide particle size distribution, uneven wall thickness and poor control precision of traditional hollow TiO2, providing a stable material basis for precise control of film refractive index, and the film prepared by light curing has light transmission performance far exceeding that of ordinary glass, and simultaneously has excellent photocatalytic degradation and super-hydrophilic self-cleaning ability, solving the problem of optical performance degradation caused by surface pollution.

The application discloses a method for preparing Yb-La co-doped TiO2 photocatalyst by a high-pressure assisted sol-gel method, and Yb-La co-doped TiO2 photocatalyst is prepared by the high-pressure assisted sol-gel method. The prepared Yb-TiO2 photocatalyst is in an anatase phase crystal form, has good crystallinity and dispersibility, has a larger specific surface area, has more active sites for surface reaction, and has a higher content of hydroxyl groups on the surface of the catalyst than that of intrinsic TiO2, so that the prepared Yb-La-TiO2 photocatalyst has very good photocatalytic activity and stability. Through structure analysis of the Yb-La-TiO2 photocatalyst, it can be found that the specific surface area of the Yb-La-TiO2 is obviously larger than that of the intrinsic TiO2. It can be seen that the larger the specific surface area is, the more the active sites for surface reaction are, and the more favorable the improvement of the photocatalytic performance is.

This invention belongs to the field of infrared radiation materials technology, specifically relating to a modified titanium dioxide-cordierite infrared emitting composite material, its preparation method, and its application. Rutile titanium dioxide powder is selected as the raw material and subjected to high-temperature calcination at 900-1100°C for 2-4 hours, with furnace cooling to allow the material to complete crystal structure rearrangement under thermodynamically stable conditions. This process effectively eliminates lattice defects, improves crystal integrity, and promotes the complete transformation of the residual anatase phase to the rutile phase, thereby obtaining a structurally stable and uniformly composed modified titanium dioxide powder. Based on this, the modified titanium dioxide and cordierite raw material are mixed in a predetermined ratio and uniformly dispersed by ball milling or mechanical stirring. After molding, the mixture is sintered at 1200-1400°C to finally prepare a dense composite ceramic material with good interfacial bonding.