45results about "Multiple metal hydrides" patented technology

The invention discloses a silicon tetrafluoride reduction process and application of sodium aluminum hydride wrapped by linear polymer resin to isolate outside air in the silicon tetrafluoride reduction process. The silicon tetrafluoride reduction process comprises the following steps: preparing a sodium aluminum hydride solution: measuring a required amount of sodium aluminum hydride which is wrapped by linear polymer resin to isolate outside air, and dissolving the sodium aluminum hydride in an organic solvent to obtain the sodium aluminum hydride solution; and reacting silicon tetrafluoride with the sodium aluminum hydride solution. The feeding safety of the sodium aluminum hydride can be guaranteed, the sodium aluminum hydride is prevented from being in contact with air to cause failure, the required sodium aluminum hydride can be accurately measured according to the designed amount, and the accuracy of the feeding ratio of the reaction raw materials in the silicon tetrafluoride reduction process is guaranteed.

This invention belongs to the field of compound synthesis technology and provides a method for preparing lithium aluminum hydride. The method includes the following steps: mixing an organic solution of aluminum trichloride and an organic solution of lithium hydride to perform a displacement reaction, obtaining a mixture of lithium aluminum hydride; mixing the lithium aluminum hydride mixture with a hydrocarbon solvent and performing solid-liquid separation to obtain lithium aluminum hydride. Lithium aluminum hydride is insoluble in hydrocarbon solvents and precipitates out, further improving the yield of lithium aluminum hydride; simultaneously, unreacted aluminum trichloride dissolves in the hydrocarbon solvent, thereby increasing the main content of lithium aluminum hydride. The preparation process of this invention has high yield, stable product content, and is easy to implement and industrialize.

The present invention discloses a LiAlH4-based composite hydrogen storage material and a solid-phase preparation method thereof. The method first prepares a lithium aluminum alloy by smelting in an inert atmosphere, then prepares a LiAl alloy by low-temperature freezing ball milling under liquid nitrogen cooling conditions, refines the grains and particle size of the lithium aluminum alloy, and finally obtains a coordinated aluminum-based composite hydrogen storage material by ball milling through a hydrogenation reaction in a hydrogen atmosphere. The present invention adopts a solid-phase preparation method, and can prepare LiAlH4 without using a catalyst, while avoiding the use of an organic solvent, eliminating the subsequent solvent removal process, and directly preparing LiAlH4 without passing through an intermediate phase Li3AlH6. The prepared LiAlH4-based composite hydrogen storage material does not contain Li3AlH6, has a low hydrogen release temperature, and a fast hydrogen release rate, and can realize the large-scale preparation and application of LiAlH4.

Metal-based hydrogen storage fibers capable of selectively absorbing and desorbing / releasing hydrogen gas, and hydrogen storage vessels comprising the fibers, wherein the fibers are preferably arranged in a fabric. The fabric is a porous structure with a large surface area, which is well suited for hydrogen storage and transport. A hydrogen storage system is provided with attractive properties. Hydrogen storage in metal hydride fibers provides a compact and safe method of hydrogen storage, wherein hydrogen molecules in the gas phase can be adsorbed on the surface of the fibers, thereby forming metal hydrides, or dissociated into individual hydrogen atoms, which can further diffuse into the bulk of the metal hydride fiber and occupy sites in the metal hydride fiber matrix.

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 invention discloses a lithium aluminum hydride preparation method and device. The method comprises the following steps: heating and distilling a lithium aluminum hydride diethyl ether solution to recover diethyl ether to obtain a concentrated lithium aluminum hydride diethyl ether solution; carrying out reduced pressure crystallization on the concentrated lithium aluminum hydride diethyl ether solution to obtain dried lithium aluminum hydride crystals; in the decompression crystallization process, the crystallization time of the lithium aluminum hydride crystals is controlled within a specified time range by controlling the crystallization temperature and the crystallization pressure; the crystallization time of the lithium aluminum hydride crystal is positively correlated with the hydrogen release time of the lithium aluminum hydride crystal; and crushing and screening the dried lithium aluminum hydride crystals to obtain lithium aluminum hydride powder of which the particle size is within a specified range. The lithium aluminum hydride prepared through the preparation method is high in effective hydrogen storage density and is a high-density hydrogen storage material suitable for hydrolysis hydrogen production, the hydrogen storage material can control the reaction rate and adjust the hydrogen release rate in an aqueous solution, the hydrogen release rate is stable, and the pressure on a hydrogen supply system is small.

The invention discloses a hydrogen-based superconducting material Na2GaCuH6 with a double perovskite structure under normal pressure and a preparation method of the hydrogen-based superconducting material Na2GaCuH6. The material has an Fm-3m space group, the lattice constant is calculated and predicted through the first principle, and the material has the superconducting transition temperature of 42.04 K under the normal pressure condition. The material is composed of four common elements of Na, Ga, Cu and H, and the cost is low; the double perovskite structure is stable in thermodynamics and dynamics under normal pressure; the electro-acoustic coupling constant lambda is approximately equal to 0.98, and medium-intensity electro-acoustic coupling is achieved. Compared with an existing high-voltage hydride superconductor, the material can work without high-voltage equipment, and the preparation and application cost is greatly reduced; compared with a traditional normal-pressure superconductor, the superconductor has a higher Tc value. The material can be applied to the fields of low-temperature superconducting devices, superconducting magnets, quantum computing and the like, and has important scientific research value and application prospect.

The invention discloses a graphite phase carbon nitride-based titanium dioxide doped lithium aluminum hydride hydrogen storage material, with dicyandiamide and titanyl sulfate as raw materials, dicyandiamide as carbon source and nitrogen source, and titanyl sulfate as titanium source; calcined after grinding and mixing, and then ball-milled with lithium aluminum hydride with a doping amount of TiO2@g-C3N4 of 3-10wt%; wherein the micromorphology of g-C3N4 is a porous structure, the micromorphology of TiO2 is a nanoparticle structure, the particle size of TiO2 nanoparticles is 8-9nm, and the micromorphology of TiO2@g-C3N4 is that TiO2 is uniformly loaded on the surface of g-C3N4. Its preparation method includes: 1, pretreatment of raw materials; 2, preparation of graphite phase carbon nitride-based titanium dioxide; 3, preparation of graphite phase carbon nitride-based titanium dioxide doped lithium aluminum hydride hydrogen storage material. As a hydrogen storage material, the initial dehydrogenation temperature is 72-82.3℃, the dehydrogenation amount is 6.6-7.3wt%, and the dehydrogenation rate is 69.8-71.7%. It has the advantages of reducing process difficulty, reducing production costs, and improving product consistency.

A method of forming an actinide-yttrium hydride includes introducing an yttrium feedstock and an actinide feedstock to a milling / mixing unit. The yttrium and actinide feedstocks are milled and mixed to form a milled mixture. The milled mixture is consolidated in a consolidation unit at a consolidation temperature to form a high-density bulk solid material. The high-density bulk solid material is exposed to hydrogen at a hydriding temperature and a hydriding pressure to form the actinide-yttrium hydride. A composition and system is also disclosed.

The utility model discloses a temperature control device for lithium aluminum deuteride production, which comprises a fixed rack, a stirring drum is fixedly connected to the fixed rack, a structure communication housing is fixedly connected to the upper part of the stirring drum, a temperature control pipe penetrates through one side of the structure communication housing, and the temperature control device further comprises a constant-speed feeding unit; the constant-speed feeding unit comprises a feeding machine shell which is arranged on the other side of the cover shell in a penetrating structure communicating mode, a driving motor penetrates through the side face of the feeding machine shell, a rotating shaft is fixedly connected to the output end of the driving motor, and a spiral feeding component is fixedly connected to the rotating shaft. The utility model belongs to the technical field of lithium aluminum deuteride production, and effectively solves the problem that in the lithium aluminum deuteride production process, the temperature control effect is influenced due to the fact that the addition amount of raw materials does not have a control function.

To provide a hydrogen storage material with reduced cost for absorbing or releasing hydrogen.SOLUTION: A hydrogen storage material according to one aspect of the present invention contains a hydride represented by a composition formula AlxMn1-xHy where x is 0.1 or more and 0.5 or less.SELECTED DRAWING: None

Disclosed is a preparation method for a nano magnesium hydride-loaded composite material, comprising the following steps: adding a cationic surfactant into an aqueous dispersion of a two-dimensional transition metal carbide, such that two-dimensional transition metal carbide nanosheets wrinkle, avoiding re-stacking, and then washing and drying same; packing the dried product into a sealed container, vacuumizing same and then raising the temperature to a high temperature, maintaining the temperature for a period of time, then filling the sealed container with high-pressure hydrogen, and maintaining the temperature for a period of time; and finally, adding the product that is subjected to heat treatment and dibutyl magnesium into an organic solvent to obtain a mixture and carrying out ultrasonic dispersion on same, stirring and heating for 12-48 hours under conditions that the hydrogen pressure is 3-6 MPa and the temperature is 180-220°C, and carrying out centrifugal drying to then obtain a nano magnesium hydride-loaded composite material. The two-dimensional transition metal carbide nano magnesium hydride-loaded composite material prepared in the present invention has advantages such as high hydrogen storage density, rapid hydrogen absorption and desorption dynamic performance and excellent cycle stability.

A hydride ion conductor is represented by a general formula:         MAMBH4-xFx     Formula (1) , where MA is selected from the group consisting of Ca, Sr, and Ba, MB is selected from the group consisting of Mg and Ca, and is different from MA, and x is 0 < x < 4.

The application discloses a preparation method of a superhigh-nickel high-cycle cobalt-free positive electrode material, and comprises the following steps: S1, a nickel source, a manganese source, a complexing agent and a precipitant are prepared into a reaction solution to perform a coprecipitation reaction, so that slurry is obtained; and centrifugation, washing and drying are performed to obtain nickel-manganese hydroxide; S2, the nickel-manganese hydroxide is uniformly mixed with a lithium source and a dopant to obtain a mixture, and first sintering is performed; the oxygen concentration in a sintering atmosphere is 86%-88%, and the sintering temperature is 650 DEG C-800 DEG C; S3, the sintered material is crushed, pickled and dried; and S4, the dried material is uniformly mixed with a coating agent, and second sintering is performed. The application adjusts the cationic disordering of the material and controls the cationic disordering degree within a certain range; the internal and external lattice distortions are relatively uniform; the cycle performance is good; the capacity attenuation is more uniform; and therefore, the cycle performance of the positive electrode material is optimal.

The invention discloses a monatomic catalyst for catalytic synthesis of sodium aluminum hydride, a composite hydrogen storage system containing the monatomic catalyst and a preparation method, two-dimensional layered Ti3CN is used as a carrier, an active component monatomic zirconium is loaded, the catalyst Zr (SA) / Ti3CN is prepared, Zr stably exists on the surface of the Ti3CN carrier in an atomic-scale dispersion form, and the composite hydrogen storage system is used for catalytic synthesis of sodium aluminum hydride. According to the present invention, by using the single atom catalyst, the near 100% utilization rate of Zr atoms is achieved, the rich N atoms in the Ti3CN carrier and Zr form the strong coordination bond (Zr-N), the single atoms are effectively anchored, the migration and agglomeration of the single atoms are prevented, the initial hydrogen desorption temperature of the composite hydrogen storage system (containing 7 wt% (1 wt% Zr (SA)) / Ti3CN) prepared by using the single atom catalyst is significantly reduced to about 86 DEG C, and the hydrogen desorption amount at 300 DEG C is as high as 5.1 wt%.

The invention belongs to the field of hydrogen storage materials, and provides a planetary shear mixing method of metal hydride powder. According to the invention, a planetary shear mixer is adopted to carry out pulse-type shear mixing on a metal hydride main phase, Ti-MgH2 core-shell intermediate powder, a catalytic doping agent, a heat-conducting and anti-agglomeration auxiliary agent, lithium hydride and a lubricating and coating auxiliary agent in the same direction of revolution and rotation in an inert atmosphere; by accurately controlling revolution speed, autorotation speed ratio and unit mass specific energy input, highly uniform dispersion and interface modification of the powder are realized, and particle size distribution uniformity, specific surface area, compact density and effective hydrogen storage capacity retention rate of the mixed powder are remarkably improved. The technical problems of high compaction density and hydrogen absorption and desorption dynamic coupling, strong shear dispersion and core-shell structure stability balance, contradiction between carbon-based network construction and effective hydrogen storage density and the like of an existing hydrogen storage system are solved, and wide hydrogen storage application value is achieved.

Metal-based hydrogen storage fibers that are capable of selectively absorbing and desorbing or releasing hydrogen gas, as well as hydrogen storage vessels including the fibers, which preferably are arranged in the form of a fabric. The fabric is a porous structure having a large surface area well suited for hydrogen storage and transportation. Hydrogen storage systems possessing attractive attributes are provided. Hydrogen storage in metal hydride fibers provides a compact and safe method for hydrogen storage, wherein the hydrogen molecules in the gas phase can be absorbed physically on the surface of the fibers forming a metal hydride and also dissociate into individual hydrogen atoms which can further defuse into the bulk fiber and occupy sites of the metal hydride fiber matrix.

To provide a hydride ion conductor that has high conduction properties at room temperature and a method for producing the same, and an all-solid-state battery that includes the hydride ion conductor and can operate at room temperature.SOLUTION: A hydride ion conductor has a composition represented by the general formula M1xM2yM3zHαOβ (where M1 represents a trivalent rare earth element, M2 represents at least one Group 2 element selected from the group consisting of Mg, Ca, Sr and Ba, and M3 represents at least one Group 1 element selected from alkali metals, with 0.4≤x<1, 0≤y≤0.6, 0≤z≤0.5, 0.7<x+y+z≤1, 0<y+z≤0.6, 2<α<3, 0≤β<0.3, 3x+2y+z=α+2β).SELECTED DRAWING: Figure 1

The invention relates to a process for producing lithium aluminum hydride, LiAlH4, by splitting lithium aluminum hexahydride, Li3AlH6, in an aprotic solvent or an aprotic solvent mixture, wherein the solvent or solvent mixture contains at least one cyclic ether and / or at least one polyfunctional ether.

The hydride ion conductor has the general formula represented by formula (1): Ba2-x-mAxMg1-y-nByH6-x-y-2m-2n where A and B are each selected from at least one or more species in the group consisting of Li, Na, K, Rb, and Cs, and 0 ≤ x ≤ 1, 0 ≤ y ≤ 1, 0 ≤ m ≤ 0.2, and 0 ≤ n ≤ 0.2, with the proviso that x = y = m = n = 0 is excluded.

A method for storing hydrogen in a metallic base material is disclosed along with material which can be obtained according to the method, and to the use of said material for providing hydrogen by releasing the hydrogen from the material. The method prevents disadvantages of conventional methods for storing H2. This is achieved in that hydrogen is stored by means of direct hydrogen enrichment of a metallic base material provided in the liquid or gaseous state and subsequent rapid solidification. An Al—Mg alloy or Al or Mg is used as the metallic base material. The material enriched with hydrogen contains hydrogen in the form of metal hydrides as well as in the dissolved form and as pores.

This invention provides a method for preparing a modified magnesium-based hydrogen storage material, comprising the following steps: mixing a certain amount of magnesium-based hydrogen storage material precursor with a certain amount of dispersion at room temperature and stirring until homogeneous; adding a certain amount of acid etchant dropwise under continuous stirring; reacting for 1-3 hours; then separating the solid phase material and drying it under vacuum to obtain the modified magnesium-based hydrogen storage material. The modified magnesium-based hydrogen storage material of this invention is obtained through a simple acid etching process, which can effectively improve the catalytic activity of the material in the hydrogenation reaction of organic liquids, thereby solving the problem of low hydrogenation activity and high energy consumption caused by long reaction times of existing catalysts.

The invention discloses a lithium aluminum hydride diethyl ether solution filtering and impurity removing method and device. The method comprises the following steps: enabling a lithium aluminum hydride diethyl ether solution needing to be filtered for impurity removal to flow through a plate-and-frame filter; the plate-and-frame filter is used for filtering lithium chloride particles in the lithium aluminum hydride diethyl ether solution based on the pore size and the material of the plate-and-frame filter; enabling the lithium aluminum hydride diethyl ether solution passing through the plate frame filter to flow through a precision filter; the precision filter is used for filtering insoluble substance lithium chloride small particles in the lithium aluminum hydride diethyl ether solution; and collecting the lithium aluminum hydride diethyl ether solution passing through the precision filter to obtain filtered and impurity-removed clear liquid. The method provided by the invention is used for filtering and impurity removal of lithium chloride in the lithium aluminum hydride diethyl ether solution produced on a large scale, and the method is simple to operate, low in cost and suitable for large-scale production.

The invention discloses a preparation method of a metal hydride block, the block obtained through the preparation method and hydrogen storage equipment, and relates to the field of hydrogen storage and transportation and medium preparation. The preparation method of the metal hydride block comprises the following steps: uniformly mixing powder or filaments of crushed hydrogen storage metal / metal alloy and heat-conducting metal and / or nonmetal, and carrying out cold pressing in a preset mold to obtain a block; and carrying out high-temperature hydrogenation on the pressed and molded block in a hydrogenation reactor to obtain the metal hydride block. According to the method, hydrogenation is conducted after pressing, the problems that in an existing magnesium powder hydrogenation process, powder particles are prone to agglomeration and sintering, the safety risk is large, and heat and mass transfer is slow are solved, the method has better heat conductivity and higher porosity, and safe and efficient large-scale metal hydride preparation is better achieved.

A hydride ion conductor, the general formula of which is represented by formula (1), MAMBH 4－x F x (1), wherein MA is selected from Ca, Sr and Ba, MB is selected from Mg and Ca and is different from MA, and 0 < x < 4.

The invention provides an electrochemical preparation method of a coordination hydride, which comprises the following steps: mixing a simple hydride AaHb of a metal A with a metal B or an alloy containing the metal B to obtain a mixture; using the mixture as a working electrode, using an A < + >-containing ion conductor as an electrolyte, and using a material capable of reversibly storing A ions as a counter electrode to assemble an electrochemical battery; voltage or current is applied, so that external circuit electrons flow from the counter electrode to the working electrode, meanwhile, A < + > flows from the working electrode to the counter electrode through the electrolyte, and the coordination hydride AXBYHZ is generated through in-situ electrochemical oxidation. The method is simple in process, mild in condition and low in cost, the ion / electron conductivity, the reaction kinetics and the cycling stability of the material can be effectively improved, the electrochemical performance and the hydrogen storage performance of the material can be effectively improved, and a new material system is expanded.

The invention belongs to the field of preparation of sodium aluminum hydride, and particularly relates to a method for reducing spontaneous combustion of sodium aluminum hydride and a sodium aluminum hydride tablet. The method comprises the following steps: pressing powdery sodium aluminum hydride into tablets to obtain the sodium aluminum hydride tablets. The powdery sodium aluminum hydride is pressed into the compact sheet shape, the spontaneous combustion property of the sodium aluminum hydride in the air can be effectively reduced through verification, the spontaneous combustion time of the sodium aluminum hydride in the air is prolonged from several minutes to 1 h or above, and safe storage, transportation and use of the sodium aluminum hydride solid are facilitated; and the reaction activity of the sodium aluminum hydride solid is not influenced due to compression molding by a physical means.

The application discloses a process method for preparing a nano-limited NaAlH4 hydrogen storage material capable of low-pressure circulation with low energy consumption, and comprises the following preparation steps: (1) pretreating selected two-dimensional carrier materials; (2) placing aluminum powder, sodium, triethylaluminum and an organic solvent into a high-pressure reaction kettle in an argon-filled glove box; (3) dispersing the pretreated two-dimensional carrier materials in the organic solvent, and sealing the reaction kettle; (4) placing the reaction kettle in an ultrasonic machine for ultrasonic mixing and dispersion; (5) vacuumizing the reaction kettle, filling hydrogen into the reaction kettle, heating the reaction kettle at a certain heating rate, and keeping for a period of time; (6) after the reaction is completed, cooling the reaction kettle to room temperature, and discharging the remaining hydrogen pressure; (7) placing the mixture under dynamic vacuum for solvent removal and drying, and obtaining the nano-limited NaAlH4. Through the above method, the pressure and temperature of the loading process are effectively reduced, and the synthesis of NaAlH4 and nano-loading are combined.

A method of treating an at least partially unconsumed hydrogen generator cartridge including water and a metal hydride includes treating the at least partially unconsumed hydrogen generator cartridge to form a treated hydrogen generator cartridge. When subjected to testing conditions the treated hydrogen generator cartridge produces no hydrogen gas or produces hydrogen gas at a lower rate than the at least partially unconsumed hydrogen generator cartridge subjected to the testing conditions. The testing conditions include heating at less than or equal to 300° C., agitation, exposing the metal hydride to a protic solvent, or a combination thereof.