802 results about "Hydride" patented technology

The invention relates to the technical field of hydrogen preparation, and provides a hydrogen storage device based on a solid hydrogen storage material and a hydrogen production method thereof.The device comprises a fuel tank internally provided with a reaction cavity used for containing an aluminum hydride material and mixed powder; the heater is arranged on the outer side of the fuel tank; the first end of the water recycling assembly is communicated with the reaction cavity, and the second end of the water recycling assembly is communicated with the fuel cell system so as to recycle water generated by the fuel cell system to the reaction cavity; the first end of the hydrogen discharging assembly is communicated with the reaction cavity, and the second end is communicated with a fuel cell system. According to the hydrogen storage device provided by the invention, through the application of the high-specific-energy solid hydrogen storage material aluminum hydride which can be stored at normal pressure and release hydrogen at a relatively low temperature, the thermal decomposition process of the metal hydride in the fuel tank and the coupling reaction process of the metal hydride and water are optimized, and the hydrogen is produced by utilizing the hydrolysis reaction of the aluminum hydride thermal decomposition reactant simple substance aluminum and the water; meanwhile, thermal decomposition of aluminum hydride is promoted through heat released by hydrolysis reaction, hydrogen release is coupled, and effective utilization of heat is achieved.

The invention relates to the technical field of solid electrolyte, and discloses a double-layer solid electrolyte membrane, a preparation method thereof and an all-solid-state battery. The double-layer solid-state electrolyte membrane comprises a first solid-state electrolyte layer and a second solid-state electrolyte layer which are overlapped with each other, the first solid-state electrolyte layer comprises hydride solid-state electrolyte, and the second solid-state electrolyte layer comprises halide solid-state electrolyte; the hydride solid electrolyte comprises Li < 7-a > P (BH4) S < 6-a > and / or Li < 7-a-b > P (BH4) S < 6-a-b > X , a < = 2, 0lt; blt; 2. The interface between the double-layer solid-state electrolyte membrane and the positive electrode and the interface between the double-layer solid-state electrolyte membrane and the negative electrode have good interface stability, and the interface side reaction between the two solid-state electrolyte layers is less, so that the solid-state battery has high coulombic efficiency and cycling stability.

The invention relates to a hydrogen storage pellet enabling the production of compact, modular, safe and energy-efficient hydrogen reservoirs. The pellet according to the invention comprises a peripheral ring (4) having an outer diameter of expanded natural graphite (ENG) of a determined height, surrounding a wafer of a metal hydride (5) in the form of compacted powder.

The invention belongs to the technical field of hydrogen production, and particularly relates to a double-tank metal hydride hydrogen purification device which comprises a first tank body, a second tank body, a primary exhaust pipe, a gas communicating pipe, a first liquid passing bathroom, a second liquid passing bathroom, a circulating liquid bath chamber and a liquid communicating pipe. A first perforated pipe and a first metal hydride are arranged in the first tank body; and a second perforated pipe and a second metal hydride are arranged in the second tank body. The primary exhaust pipe is communicated with the first perforated pipe, and the gas communication pipe is communicated with the primary exhaust pipe and the second perforated pipe. And the first tank body and the second tank body are coated with the first liquid passing bathroom and the second liquid passing bathroom respectively. And the first liquid passing bathroom, the circulating liquid bath chamber, the second liquid passing bathroom and the liquid communicating pipe are communicated in sequence to form a liquid pipeline. Through the design of the circulating liquid bath chamber and the liquid communicating pipe, the hydrogen absorption and heat release process and the hydrogen desorption and heat absorption process are mutually compensated, the heat utilization efficiency is improved, the external heating and cooling requirements are reduced, and the energy consumption in the hydrogen purification process is reduced.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention relates to the technical field of hydrogen storage, and provides a double-storage and double-release system based on hydrogen storage and phase change heat storage and a heat regulation and control method thereof.The double-storage and double-release system comprises a metal hydride hydrogen storage unit, a phase change heat storage unit and a heat regulation unit; a hydrogen storage heat conduction pipe is arranged in the metal hydride hydrogen storage unit, a heat storage heat conduction pipe is arranged in the phase change heat storage unit, and temperature sensors are arranged on the metal hydride hydrogen storage unit and the phase change heat storage unit. A heat exchange fluid medium is placed in the heat adjusting unit, and the heat adjusting unit is communicated with an inlet and an outlet of the hydrogen storage heat conduction pipe and an inlet and an outlet of the heat storage heat conduction pipe through a heat exchange medium conveying pipeline to form a closed pipeline. An electromagnetic valve is arranged on the heat exchange medium conveying pipeline, and the opening degree of the electromagnetic valve is adjusted according to the temperature detected by the temperature sensor so as to regulate and control the flow of the heat exchange fluid medium. The efficiency of thermal management in the hydrogen storage and release process is remarkably improved, and the applicability of the hydrogen storage and release device in different scenes is further enhanced.

The invention relates to the technical field of hydrogen energy solid hydrogen storage, and discloses a metal hydride hydrogen storage tank and a circulating hydrogen charging and discharging method.The metal hydride hydrogen storage tank comprises a tank body, the top end of the tank body is communicated with a gas inlet pipe, and the bottom end of the gas inlet pipe extends into the tank body and is rotationally provided with a connecting pipe through a rotating connector; a plurality of circular heat dissipation fins are fixedly connected between the inner walls of the tank body, the bottom end of the connecting pipe penetrates through the heat dissipation fins to be rotationally connected with the bottom end of the tank body, and a plurality of air holes are formed in the surface of each heat dissipation fin; four telescopic rods are fixedly connected to the top wall of the interior of the tank body, the hydrogen storage tank drives the transmission assembly to drive the connecting pipe and the stirring plate to rotate through movement of the piston, metal hydride is prevented from caking, hydrogen is dispersed more evenly through inclined air outlet holes, and the hydrogen storage efficiency is improved; the circular heat dissipation fins are provided with air holes, so that heat dissipation is achieved, and circulation of hydrogen is not blocked.

The invention discloses a preparation method of niobium-tungsten alloy spherical powder and a 3D printing method of the niobium-tungsten alloy spherical powder, and belongs to the technical field of refractory metal material preparation.The preparation method comprises the steps that niobium, tungsten, molybdenum and zirconium refractory metal raw materials are smelted to obtain cast ingots with uniform components, and hydride powder is formed after hydrotreating and mechanical crushing; spherical powder is prepared by adopting a plasma spheroidizing technology, then dehydrogenation is performed for 1-3 hours at the temperature of 450-750 DEG C, magnesium powder is added, treatment is performed for 2-5 hours in an inert atmosphere at the temperature of 800-1100 DEG C, and finally the low-oxygen niobium-tungsten alloy spherical powder with the oxygen content lower than 120 ppm is obtained. Compared with a traditional process, the spheroidizing treatment is innovatively carried out before the dehydrogenation and oxygen reduction process, the deoxidation efficiency is improved through the relatively small specific surface area of spherical powder, and oxygen content control is achieved in combination with magnesium powder heat treatment. The problems of high oxygen content and low powder yield in a traditional process are solved, and material support is provided for high-performance niobium-tungsten alloy components in the fields of aerospace, nuclear power and the like.

The magnesium-based metal hydride hydrogen storage system with the energy recovery function comprises an energy recovery device and a hydrogen storage tank, a first heat exchange pipe is installed in the energy recovery device, and the energy recovery device is filled with phase change heat storage materials; the hydrogen storage tank is filled with a magnesium-based hydrogen storage material, a second heat exchange pipe is arranged in the hydrogen storage tank, and heat conduction oil is filled in the second heat exchange pipe; an oil outlet of the second heat exchange pipe is connected with an oil inlet of the heating module through a first pipe set, an oil outlet of the heating module is connected with an oil inlet of the second heat exchange pipe through a second pipe set, and a circulating pump is installed on the second pipe set. The first pipe group is connected with an oil inlet of the first heat exchange pipe through a first branch pipe; the second pipe set is connected with an oil outlet of the first heat exchange pipe through a second branch pipe. By arranging the energy recovery device, energy released in the hydrogen absorption process can be recovered, energy is provided in the hydrogen desorption process, energy-saving and efficient hydrogen storage are achieved, and the operation stability of the hydrogen storage system is guaranteed.

A dehydrogenation reaction device includes a chemical hydride storage unit including a chemical hydride storage tank, a reaction unit including an acid aqueous solution storage tank, and a dehydrogenation reactor configured to generate hydrogen by reacting a chemical hydride with an acid aqueous solution, and a hydrogen storage unit including a hydrogen storage tank configured to store the hydrogen produced in the dehydrogenation reactor. The dehydrogenation reactor includes a body portion made of a metal and a reinforcement portion surrounding the outer surface of the body portion and including fiber reinforced plastic (FRP).

The invention provides an ammonia synthesis method with high activity under mild conditions, ammonia is synthesized through photo-thermal catalysis, a photo-thermal catalyst is a transition metal composite metal hydride, the metal hydride is an alkali metal hydride or an alkaline earth metal hydride and has high catalytic activity, and a high ammonia synthesis rate can be obtained. When the transition metal composite metal hydride is loaded on the carrier, the ammonia synthesis rate can be further improved, and the catalyst has a good application prospect.

The invention belongs to the technical field of catalysts, and particularly relates to a ruthenium-based supported catalyst as well as a preparation method and application thereof. The ruthenium-based supported catalyst provided by the invention comprises a composite carrier and ruthenium supported on the composite carrier, the composite carrier is one or more of a perovskite type metal oxide and an alkali metal oxide, an alkali metal hydroxide, an alkaline earth metal oxide and an alkaline earth metal hydroxide which are dispersed on the surface of the perovskite type metal oxide; the preparation method of the composite carrier comprises the following steps: mixing a perovskite type oxide with an alkali metal hydride and / or an alkaline earth metal hydride, and carrying out first calcination; soaking the first calcined product in a solvent to obtain a composite carrier; the perovskite type oxide comprises one or two of MgTiO3 (magnesium titanate), SrTiO5 (strontium titanate), BaTiO3 (barium titanate) and CaTiO3 (calcium titanate); the solvent comprises an alcohol solvent and / or water. The catalyst provided by the invention can catalyze an ammonia synthesis reaction under a relatively low pressure.

The invention discloses a method for improving the quality of a laser cladding refractory high-entropy alloy coating, and belongs to the technical field of alloy coatings. The refractory high-entropy alloy coating is composed of WMoTaNb and hydride of Ti or V, the refractory high-entropy alloy coating is a single BCC phase, and the refractory high-entropy alloy coating is prepared through coaxial powder feeding laser cladding. The laser cladding refractory high-entropy alloy coating prepared through an introduction method (solid solution strengthening and in-situ deoxidation) has excellent wear resistance and high-temperature oxidation resistance, the quality and performance of the refractory high-entropy alloy coating are improved through additional powder, and the microhardness of the section of the refractory high-entropy alloy coating reaches up to 674.52 HV0. 2. The coating can be applied to the fields of aerospace, nuclear reactors and the like.

The present application provides a solid-state hydrogen storage material and a preparation method and application thereof. Specifically, the preparation method comprises the following steps: (1) ball-milling a magnesium-based alloy powder, a light metal hydride, a nano-carbon material, a composite catalyst powder and an interface modifier to obtain a mixed powder; and (2) sintering the mixed powder under vacuum at 200-350 DEG C for 2-5 hours to obtain a sintered body, wherein: the magnesium-based alloy powder is a Mg-Mn-Al alloy powder; the light metal hydride is a mixture of LiAlH4 and NaBH4; the nano-carbon material is selected from one or more of graphene and carbon nanotubes; the composite catalyst powder is a mixture of TiO2, Fe3O4, CeO2 and La2O3; and the interface modifier is selected from one or more of a silane coupling agent and a titanate coupling agent. The solid-state hydrogen storage material has high hydrogen storage capacity, fast hydrogen absorption and desorption rate and good cycle stability.

The invention provides a feeding control method and device for an arsenic hydride reaction kettle, equipment and a storage medium, and belongs to the technical field of arsenic hydride reaction, and the method comprises the following steps: determining an initial feeding mode of raw materials at the initial reaction stage based on the volume of the reaction kettle and an expected reaction molar ratio; the raw materials comprise zinc arsenide and dilute sulphuric acid; the desired reaction molar ratio is the desired molar ratio between zinc arsenide and dilute sulphuric acid; in response to the situation that the pressure change rate in the reaction kettle is smaller than a preset change rate value, the initial feeding mode is switched into a constant-speed feeding mode of raw materials in the middle stage of reaction; in response to the condition that the generation rate of the arsenic hydride is lower than a preset generation rate value, switching the constant-speed feeding mode into a final feeding mode of raw materials at the end of the reaction; according to the arsenic hydride reaction kettle feeding control method and device, the equipment and the storage medium provided by the invention, the feeding opportunity and the feeding speed of the reaction kettle can be accurately grasped.

A device for compressing a medium is equipped with a compressor unit (2) for compressing a drive medium and with a pressure intensifier (13) operatively connected to the compressor unit, in which a drive piston (15) driven by the drive medium and a high-pressure piston (18a, 18b) cooperating with the drive piston (15) for compressing the medium to be compressed is arranged. According to the invention, hydrogen is used as the drive medium, and the compressor unit (2) comprises a hydrogen storage system (3a, 3b) which has a pressure vessel (4a, 4b) equipped with a metal hydride storage medium (7a, 7b) with at least one supply line (5a, 5b, 6a, 6b) for supplying and / or removing hydrogen into or from the pressure vessel (4a, 4b) and a heating device (8a, 8b) for heating the metal hydride storage medium (7a, 7b) in the pressure vessel (4a, 4b).

The invention provides a method for growing an aluminum nitride thick film through a hydride vapor phase epitaxy method, and belongs to the technical field of third-generation semiconductor material preparation. According to the method, an aluminum source area in HVPE equipment is improved, supply of a multi-partition independent control aluminum source is provided, a periodic etching control strategy of an HCl gas channel is introduced, and a nested collaborative epitaxy method of outer-layer aluminum source rotation and inner-layer growth cycle embedded etching is formed. The problems of aluminum source degradation, nozzle blockage and stress accumulation in existing HVPE growth can be effectively solved, and long-time continuous operation of epitaxial AlN of the HVPE equipment is achieved; interruption and replacement operations caused by degradation of the aluminum source in long-time growth are avoided; nozzle area deposition is effectively removed, and the flow field stability is maintained; the stress is dynamically released, the crack occurrence rate is reduced, the film layer integrity is improved, and the method is suitable for HVPE equipment transformation and upgrading.

The invention provides an alkyne selective hydrogenation catalyst with high activity and high selectivity and a preparation method thereof. The catalyst is a compound of metallic nickel and alkali metal hydride and is marked as nickel-alkali metal hydride, high catalytic reaction activity and high olefin selectivity can be both considered by regulating and controlling the proportion of the nickel elementary substance and the alkali metal hydride, and compared with the metallic nickel and the alkali metal hydride as the catalyst, the catalyst has the advantages that the catalytic activity is high; the catalytic activity and the olefin selectivity are greatly improved. The nickel-alkali metal hydride catalyst is suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure fixed bed gas phase reaction system, is also suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure reaction kettle liquid-solid phase reaction system, and has a good application prospect.

A process for the preparation of a curable thermally conductive composition and the process comprises the steps of: (I) preparing an admixture comprising the following components (A), (B1), (C), (D) and (E): (A) 3 wt% to 10 wt% of a Q-branched alkenyl functional polyorganosiloxane having at least three terminal alkenyl groups per molecule, and having a viscosity of from 25 mPa * s to 2000 mPa * s as determined at 25 DEG C according to ASTM D445-21 using a viscometer of the glass capillary Cannon-Finsky type; and a method for preparing the same, wherein the viscosity is from 25 mPa * s to 2000 mPa * s as determined at 25 DEG C using a viscometer of the glass capillary Cannon-Finsky type; (B1) a silyl-hydride functional polysiloxane crosslinker containing at least two silyl-hydride groups per molecule, and present in a concentration that provides a molar ratio of silicon-bonded hydrogen atoms in (B1) to alkenyl groups in the Q-branched alkenyl functional polyorganosiloxanes in the range of 0.2 to 0.35; (C) 90 wt% or more of a thermally conductive filler; (D) a filler treatment agent; and (E) a platinum-based hydrosilylation reaction catalyst; (II) curing the admixture obtained from step (I) by heat, thereby forming a pre-cured composite material; and (III) mixing the pre-cured composite material obtained from step (II) with (B2) a silyl-hydride functional polysiloxane cross-linking agent containing at least two silyl-hydride groups per molecule; thereby obtaining a curable thermally conductive composition; wherein the molar ratio of the total silicon bonded hydrogen atoms in the silyl-hydride functional polysiloxane crosslinkers (B1) and (B2) to the alkenyl groups in the Q-branched alkenyl functional polyorganosiloxane (A) is greater than 0.45; and wherein the weight percentages are relative to the weight of the curable thermally conductive composition.

The invention relates to the technical field of ferrous metallurgy and solid waste treatment, in particular to an efficient utilization production process of iron-containing ore powder and slag powder, which comprises the following steps: preheating the iron-containing ore powder ground by a grinder by a preheater, and feeding the iron-containing ore powder into a reduction furnace; a fan provides aerodynamic force, high-temperature gas obtained after air is preheated by a hot-blast stove and hydrocarbon such as pulverized coal sprayed from a pulverized coal feeding port are combusted, and generated reducing gas such as CO and H2 enters a reduction furnace through an annular exhaust outlet of a hearth and is subjected to a reduction reaction with iron-containing ore powder entering the reduction furnace and the high-temperature gas such as CO and H2 at high temperature; and reducing into metal iron powder and slag. Iron ore powder does not need to be made into prefabricated lump ores such as pellets and sinter, and dependence of a blast furnace on metallurgical coking coal is avoided; iron ore powder can be directly used for producing metal iron powder, water is saved, and the risk that high-temperature molten iron explodes when encountering water is eliminated; green hydrogen can be used as a reducing agent, and the method is a preferable scheme in the ferrous metallurgy industry.

The embodiment of the invention discloses a composite shielding plate and a preparation method thereof, and the composite shielding plate comprises a cladding which is provided with an accommodation space, and the accommodation space is in a vacuum state; the shielding material is arranged in the accommodating space; wherein the shielding material comprises a neutron moderation base material, and the cladding is made of a boron-containing metal material; or the shielding material comprises a neutron moderation base material and a neutron absorption base material, the cladding is made of a metal material, the neutron moderation base material comprises rare earth hydride, and the neutron absorption base material comprises boron-containing ceramic. The composite shielding plate provided by the embodiment of the invention not only comprises the neutron moderation base material which is high in hydrogen content and excellent in temperature resistance so as to effectively moderate fast neutrons, but also is combined with the neutron absorption base material containing boron atoms so as to efficiently absorb thermal neutrons, so that the complete neutron moderation-absorption integrated shielding performance of the composite shielding plate is realized; and stable shielding performance can be provided at the temperature of 300-1000 DEG C.

The invention belongs to the technical field of heat storage, and provides a paired metal hydride storage tank heat storage system and method for solar power generation. Wherein the paired metal hydride storage tank heat storage system is respectively communicated with the solar concentrating system and the electric power system through a heat exchange medium pipeline; the paired metal hydride storage tank heat storage system is configured in a multi-stage tandem mode, and at least two stages of heat storage systems are sequentially arranged in the flowing direction of heat exchange fluid in the heat output process. Under the operation requirement higher than the threshold load, all levels of heat storage systems are in an activated state, heat exchange fluid flows through each level of system according to a preset path, and heat released by each level of heat storage system is absorbed step by step; and under the condition that the load is lower than the threshold value for operation or the set working condition requirement, at least one stage of heat storage system bypass directly obtains the needed heat from other stages of heat storage systems.

The invention discloses a self-adaptive fixing structure for a nickel-hydrogen battery, and belongs to the technical field of batteries. The upper clamping mechanism is fixed at the top end of the inner wall of the shell; the lower clamping mechanism is fixed at the bottom end of the inner wall of the shell; the plurality of battery pieces are stacked and fixed between the upper clamping mechanism and the lower clamping mechanism; and the spring penetrates through the plurality of battery pieces and is detachably connected between the upper clamping mechanism and the lower clamping mechanism. According to the battery fixing structure, the spring is arranged between the telescopic upper clamping mechanism and the telescopic lower clamping mechanism, and battery pieces can be stacked between the upper clamping mechanism and the lower clamping mechanism according to actual requirements, so that the battery capacity is adjusted, the adaptive capacity of the battery fixing structure is improved, and meanwhile, certain buffering and damping effects are considered.

The invention provides a method for growing a (310) oriented beta-Ga2O3 single crystal thick film on a sapphire substrate. The method comprises the following steps: cleaning the sapphire substrate and then carrying out annealing treatment; and with hydrogen chloride gas, gallium metal and oxygen as reaction sources, epitaxially growing a (310) oriented beta-Ga2O3 single crystal thick film on the treated sapphire substrate by using a hydride vapor phase epitaxy method. According to the method for growing the (310) oriented beta-Ga2O3 single crystal thick film on the sapphire substrate, the process is simple, operation is easy, controllability is high, the obtained (310) oriented beta-Ga2O3 single crystal thick film is smooth in surface, compact and uniform in thickness, the crystallinity of the single crystal film layer is high, and the growth requirement of a single crystal epitaxial film layer of tens of micrometers can be met; in addition, the method provided by the invention can realize large-batch and large-scale production of the (310) oriented beta-Ga2O3 single crystal thick film, and meets the device preparation requirements.

The invention relates to the field of catalytic reaction equipment, and discloses a catalyst coating body, a reactor, application of the catalyst coating body and an organic hydride dehydrogenation method.The catalyst coating body comprises a shell and a cavity formed by the shell in a surrounding mode, a heating body is arranged in the cavity, the surface of the shell is coated with a catalyst in the length direction, the shell is a non-uniform-section body, and the heating body is arranged in the cavity. The shell comprises small-section sections at the two ends and a large-section section arranged between the small-section sections at the two ends. The reactor has the advantages of being good in heat transfer effect, uniform in temperature distribution, capable of avoiding quick loss of active substances and suitable for large-scale industrial production.

The invention relates to a lanthanum oxide catalyzed high-capacity hydrogen storage alloy and a preparation method thereof, the hydrogen storage alloy comprises the following components: Mg < 85-x > Zr < x > Sm < 12-y > Nd < y > N < i < 5-z-m > Cu < z > Zn < m + n > wt.% La2O3, in the formula, x, y, z and m are atomic ratios, and 0 lt; x is less than or equal to 5, 0lt; y < = 3, 0lt; z < = 2, 0lt; m is less than or equal to 2, n is the percentage of La2O3 in the alloy, and n is more than or equal to 4 and less than or equal to 12. Preferably, the atomic ratio x: y: z: m is 3: 2: 1: 1, and n is equal to 7. The preparation method comprises the following steps: smelting by induction heating under the protection of inert gas, pouring a liquid alloy into a tundish, and continuously spraying the liquid alloy on the surface of a rotating water-cooled copper roller through a BN nozzle at the bottom of the tundish to obtain a rapidly quenched alloy with a nanocrystalline structure; and the rapidly quenched alloy is mechanically crushed and sieved, the sieved alloy powder and a certain amount of catalyst La2O3 are subjected to ball milling in an all-dimensional planetary high-energy ball mill under the protection of protective gas, and alloy powder with ultra-fine grains (nanoscale) is obtained. Through component design, microstructure regulation and control and addition of a catalyst, the thermal stability of alloy hydride is reduced, and the hydrogen absorption and desorption thermodynamic and dynamic performance of the alloy is improved.

A solid material comprising or, alternatively, consisting of: (i) at least one metal selected from among Fe, Co, Ni, Mo, Ru, V, Mn; (ii) at least a support for said at least one metal (i), said support being an oxide of Ti, Si, Ce, Al, Zr, La, Eu, Pr or Nb; (iii) at least a hydride of an alcali metal or an alcali-earth metal; (iv) at least a nitride. A use of said solid material as a catalyst, and a process for the preparation of a solid material are also disclosed.

A method of obtaining a purified rare earth metal deposit from a rare earth metal halide salt, by: (i) producing a rare earth metal borohydride salt by the following reaction:n·ABH4+m·(RE)X3→RE(BH4)3+n·AXwherein the variables are defined as follows: A is an alkali metal cation; RE represents one or more rare earth metal cations; X represents a halide selected from chloride, bromide, and iodide; n is the molar amount of ABH4; and m is the molar amount of (RE)X3; wherein the ratio of n:m is 3:1 to 5:1; (ii) mixing RE(BH4)3 and AX with a halogen-free organic solvent to form a solution containing the RE(BH4)3 salt dissolved therein and with AX undissolved and precipitated; and (iii) contacting the solution from step (ii) with an anode and cathode in electrical communication, and electrically charging the anode and cathode to electroplate the rare earth metal onto the cathode.

The invention discloses a preparation method of an R-T-B rare earth permanent magnet, and the method comprises the following steps: 1, coating with a coating: coating an S1 region on the surface of a permanent magnet substrate with a first coating to obtain a first coating region S1, and coating an S2 region on the surface of the permanent magnet substrate with a second coating to obtain a second coating region S2; the first coating area S1 is smaller than or equal to S, the second coating area S2 is smaller than or equal to S, S is the magnet surface area where the coating face is located, and the first coating and the second coating are composed of one or more components of pure metal containing Dy and / or Tb, hydride, fluoride and oxide; and 2, carrying out grain boundary diffusion treatment on the magnet obtained in the step 1, and carrying out aging treatment after cooling to obtain the R-T-B rare earth permanent magnet. The method has the advantages that diffusion of heavy rare earth in a grain main phase can be reduced, the use amount of the heavy rare earth is reduced, and the coercive force of a selected area can be further enhanced.

The invention provides a multi-gas mixed supply type metal hydride hydrogen storage PCT testing device and method, and belongs to the technical field of hydrogen storage material performance detection. In the device, a hydrogen source and a carbon monoxide gas source in a gas mixed supply system respectively pass through a pressure reducing valve and a mass flow controller corresponding to the hydrogen source and the carbon monoxide gas source, and then pass through a first valve, a deoxidizing agent device and a dehydrating agent device to be connected with a main pipeline; the argon source is connected into the main pipeline through the pressure reducing valve and the second valve and used for calibrating the volume; the large gas supply tank is connected into the main pipeline through a third valve, and the small gas supply tank is connected into the main pipeline through a quick connector and a fourth valve; the vacuum pump is connected to the main pipeline through a fifth valve; a hydrogen storage alloy is placed in the sample chamber which is connected with the main pipeline through a sixth valve; a temperature control device is arranged outside the sample chamber; and the monitoring and control system is used for detecting and recording the gas pressure change and controlling and monitoring the temperature of the sample chamber. The device can accurately evaluate the hydrogen storage performance change of the hydrogen storage alloy under different poisoning conditions.