14 results about "Rhenium oxide" patented technology

The application discloses a method for preparing high-purity ammonium rhenate by separating molybdenum and rhenium, which comprises a reaction device and a reaction process. The reaction device is a T-shaped quartz tube, which is divided into four temperature zones. The first, second and third temperature zones are located in the horizontal tube section of the T-shaped quartz tube, and the fourth temperature zone is the vertical tube section of the T-shaped quartz tube. Oxide raw materials containing molybdenum and rhenium are placed in the first temperature zone. Under the oxygen atmosphere, the high-valence molybdenum and rhenium oxides are separated in the horizontal straight tube by the temperature difference between the temperature zones. The gaseous high-valence rhenium is condensed in the fourth temperature zone to generate high-purity rhenium heptoxide. Under the assistance of high-purity ammonia water, high-purity ammonium rhenate is prepared by cooling and crystallization. The quality of the ammonium rhenate can reach 4N or above.

This invention belongs to the field of metal ingot preparation technology, specifically relating to a high-purity rhenium ingot and its preparation method. Using ammonium perrhenate solution as raw material, this invention directly generates elemental rhenium and rhenium oxides of different valence states through electrodeposition without complex pretreatment. The mixture is then crushed and fed into a transferred arc hydrogen plasma reaction zone, where the rhenium oxides of different valence states are rapidly reduced to rhenium powder under the high temperature and high energy environment of the hydrogen plasma. The rhenium powder and elemental rhenium fall into a water-cooled copper crucible, where they are continuously heated and melted by the transferred arc hydrogen plasma to form liquid rhenium. Unreacted rhenium oxides continue to be reduced in the liquid rhenium pool to ensure complete reduction. Finally, the liquid rhenium is cooled and solidified to obtain a high-purity rhenium ingot. This invention integrates the reduction and melting processes, resulting in a simple and efficient process that effectively avoids the introduction of impurities. The prepared rhenium ingot has a purity ≥99.99%, high density, and uniform composition, making it widely applicable in high-end fields such as aerospace, nuclear energy, and electronics.

A method for synthesis of Lorazepam in a continuous flow using continuous flow reactor, in which method comprises five steps including N-acylation, diazepine ring closure, imine N-oxidation, Polonovski-type rearrangement, and ester hydrolysis; a green reagent comprising a peroxide reagent and rhenium oxide catalyst for N-oxidation of delorazepam; and an ammonium source combination for the synthesis of delorazepam.

This invention belongs to the field of tungsten-based alloy powder preparation technology, specifically relating to a spherical tungsten-rhenium alloy powder and its preparation method. The preparation method includes the following steps: mixing ammonium tungstate, ammonium rhenium oxide, yttrium hafnium oxide, and a forming agent in water, followed by spray drying to obtain a mixed crystalline powder; subjecting the mixed crystalline powder to reduction treatment in a hydrogen atmosphere to obtain tungsten-rhenium alloy powder; and subjecting the tungsten-rhenium alloy powder to plasma spheroidization treatment under argon conditions to obtain the spherical tungsten-rhenium alloy powder. This invention significantly improves the density of the sintered blank and enhances the room-temperature and high-temperature mechanical properties of the tungsten-rhenium alloy by adding yttrium hafnium oxide and a forming agent composed of polyethylene glycol, polyvinyl alcohol, and molybdenum disulfide to the tungsten-rhenium alloy powder.

This invention provides active materials, electrodes, secondary batteries, battery packs, and vehicles for secondary batteries that achieve excellent fast charge / discharge performance and cycle life. It provides an active material comprising a composite oxide having a crystal structure comprising a rhenium oxide-type bulk structure containing an octahedral structure composed of oxygen and metal elements, and formed by the common vertices of the octahedral structure. The composite oxide is in the form of the general formula Li. a M b NbMo c O d M is selected from any one or more of Ti, V, Ta, Fe, Co, Mn, Ni, Bi, Sb, As, P, Cr, W, B, Na, K, Mg, Al, Ca, Y, and Si, where 0 ≤ a ≤ b + 2 + 3c, 0 ≤ b ≤ 1.5, 0 ≤ c ≤ 0.5, and 2.33 ≤ d / (1 + b + c) ≤ 2.50. In the micro Raman spectrophotometer of the composite oxide at an excitation wavelength of 532 nm, the value is located at 640 ± 10 cm⁻¹. ‑1 The displacement S1 of the Raman peak P1 originating from the Mo-O bond is located at 920±20cm. ‑1 The difference in displacement S2 of the Raman peak P2 originating from the Nb-O bond is 285 cm. ‑1 above.

The invention provides superfine high-uniformity W-based solid solution powder and a preparation method thereof, and relates to the technical field of powder metallurgy, the preparation method of the superfine high-uniformity W-based solid solution powder comprises the following steps: (a) mixing a tungsten-containing oxide, a rhenium-containing oxide and / or molybdenum-containing oxide and a reducing agent to obtain a mixed raw material; (b) carrying out reduction treatment on the mixed raw material to obtain the superfine high-uniformity W-based solid solution powder, wherein the reduction treatment comprises a first stage and a second stage, and the treatment temperature of the second stage is higher than that of the first stage. According to the method, the superfine W-based solid solution powder with the particle size of 100-500 nm is finally obtained by combining low-cost raw materials with a short-process reduction process. According to the method, on the basis of ensuring that the powder with the superfine particle size and uniform components is obtained, the energy consumption is remarkably reduced, and the method is particularly suitable for large-scale production of the W-Re and W-Mo solid solution powder.

The invention discloses a preparation method of rhenium trioxide and rhenium dioxide, which comprises the following steps of: 1, dissolving ammonium perrhenate in deionized water to prepare an ammonium perrhenate solution, and enabling the ammonium perrhenate solution to flow through an exchange column filled with H + type C160 cationic resin to obtain a perrhenic acid solution; 2, ammonium perrhenate is subjected to hydrogen reduction, and active rhenium powder is obtained; 3, mixing and drying the perrhenic acid solution and the active rhenium powder to obtain a rhenium oxide precursor; and 4, thermally decomposing the rhenium oxide precursor in an inert atmosphere to obtain a rhenium trioxide or rhenium dioxide solid. According to the method, ammonium perrhenate is subjected to cationic resin ion exchange and hydrogen reduction treatment to obtain a perrhenic acid solution and active rhenium powder respectively, then the perrhenic acid solution and the active rhenium powder are evenly mixed, dried and subjected to thermal decomposition, and cubic-crystal-form rhenium trioxide or orthorhombic-crystal-form rhenium dioxide solids are obtained; the crystal form of rhenium dioxide is effectively controlled, the raw materials are easier to obtain and store, the difficulty of the preparation process is reduced, and the method is suitable for large-scale production.

The application belongs to the technical field of metal powder preparation, and particularly relates to high-purity rhenium powder and a preparation method thereof. The high volatility of rhenium oxide is utilized, efficient volatilization of rhenium oxide is realized under vacuum conditions, and the high activity of hydrogen radio frequency plasma is utilized to rapidly and completely reduce the rhenium oxide vapor into high-purity rhenium powder, so that the reduction reaction efficiency is significantly improved, efficient and clean preparation of rhenium powder is realized, the problem of impurity introduction in the traditional reduction method can be avoided, and the product purity and particle size can meet the application requirement of high-end fields.

Embodiments of the present application relate to an active material, an electrode, a secondary battery, a battery pack, and a vehicle. Provided are an active material and an electrode that enable a secondary battery with high capacity, a secondary battery and a battery pack with high capacity, and a vehicle equipped with the battery pack. According to the embodiments, an active material including a composite oxide including a plurality of rhenium oxide type blocks having different sizes and sharing at least an octahedral edge without having a periodically connected structure is provided. The rhenium oxide type blocks include an octahedral structure composed of oxygen and a metal element and are composed by sharing vertices of the octahedral structures. The composite oxide is represented by a general formula Li a M b NbMo c O d wherein M is one or more selected from the group consisting of Ti, V, Ta, Fe, Co, Mn, Ni, Bi, Sb, As, P, Cr, W, B, Na, K, Mg, Al, Ca, Y, and Si, 0≤a≤b+2+3c, 0≤b≤1.5, 0≤c≤0.5, and 2.33≤d / (1+b+c)≤2.50.

The present invention relates to the use of a catalyst made of rhenium oxide supported by cerium oxide, with formula ReOx / CeO2 (I), for catalyzing the deoxydehydration of glycerol to allyl alcohol, the reaction being carried out under heterogeneous conditions in the presence of at least one aliphatic alcohol; and to a method for producing allyl alcohol from glycerol in the presence of the catalyst.

The invention discloses an ultra-small-size ruthenium-rhenium-oxygen solid solution particle water electrolysis catalyst and a preparation method thereof. Ruthenium-rhenium alloy grows on the surface of rhenium trioxide through a solvothermal method to obtain a ruthenium-rhenium-oxygen solid solution, XPS characterization proves that the product contains multivalent ruthenium and rhenium components and a rhenium trioxide carrier, the particle size of ruthenium-rhenium nanoparticles on the carrier is 1-3 nm, and the utilization rate of ruthenium is greatly increased. An electrochemical test shows that the mass activity, the stability and the cost performance of the catalyst in a pure seawater electrolytic reaction are higher than those of commercial platinum. The catalyst has great significance on commercialization of a direct seawater electrolysis hydrogen production technology.

The present invention relates to a catalyst for preparing vinyl acetate and a preparation method therefor, and the use thereof. The preparation method comprises the following steps: kneading, drying, and shaping an ultrafine silica gel powder, ultrafine diatomaceous earth, a silica sol, and a boron compound at a weight ratio of 100: (5-20): (10-60): (0.1-1), followed by calcination at 150-650ºC for 1-6 h to prepare a boron-doped composite SiO2 carrier; subjecting the carrier to incipient wetness impregnation with rolling with a solution of palladium and gold compounds at a Pd / (Au+Pd) molar ratio of 0.76-0.93 and a loading amount of 0.5%-1% relative to the carrier mass, followed by drying; treatment with an alkaline solution for 0.5-30 h, then drying, and reduction at 300-650ºC in a nitrogen-hydrogen atmosphere for 1-6 h, and washing same with water until chlorine-free, followed by drying; preparing a dilute sol by mixing copper acetate and cesium oxide at a Cu / (Re+Cu) molar ratio of 0.93-0.97 and a loading amount of 0.3%-1% with 0.5%-3% aluminum phosphate, followed by dip coating and drying; impregnating with a potassium acetate solution at a loading amount of 0.2%-7.5%, and performing a heat treatment at a negative pressure at 60-200ºC for 1-6 h, to obtain a highly stable, long-life catalyst, which has high strength and few by-products.

The application relates to a high-strength and high-conductivity rhenium and / or rhenium oxide dispersion strengthened copper alloy and a preparation method thereof, and belongs to the technical field of metal matrix composites. The alloy takes rhenium (Re) and rhenium oxide (ReO x ) as a dispersion strengthening phase and is prepared through a gas flow crushing-cold isostatic pressing-hydrogen reduction-discharge plasma sintering-hot extrusion composite process. The application utilizes the intrinsic conductivity and 'rhenium effect' of rhenium and / or rhenium oxide, effectively overcomes the problem of the decrease of the conductivity and the thermal conductivity caused by the traditional Al2O3 dispersion phase, and significantly improves the strength of the alloy. The obtained alloy has a density of not less than 99.5%, a tensile strength of more than 500 MPa, a conductivity of more than 90% IACS, and a thermal conductivity of more than 350 W / (m*K), and has the properties of high strength, high conductivity and high thermal conductivity. The application is suitable for high-temperature and high-conductivity scenes such as lead frames, resistance welding electrodes and heat sink materials.

The invention discloses a method for preparing rhenium dioxide based on sodium formate reduction of perrhenate radicals, and belongs to the technical field of metal material powder metallurgy preparation. The method comprises the following steps: adding perrhenate radicals into an aqueous solution containing sodium formate, taking ionizing radiation such as a < 60 > Co source and an electron accelerator as an energy source, and carrying out irradiation under the ionizing radiation to reduce precipitation to prepare rhenium dioxide. At present, perrhenate radicals can only be reduced to rhenium trioxide through a photoelectrocatalysis method, but the perrhenate radicals can be reduced to rhenium dioxide in a lower valence state through a radiation method; compared with a radiation method using alcohol as a sacrificial agent, the method has the advantages that rhenium dioxide precipitates instead of rhenium dioxide colloids can be directly generated by using sodium formate as the sacrificial agent, so that product separation is facilitated, and the yield is higher. More importantly, the usable radiation source is a commercial electron accelerator with an extensible scale, and the industrial prospect is achieved.