89results about How to "Low hydrogen release temperature" patented technology

The invention relates to liborohydride hydrogen storage material and a preparation method thereof, which is characterized in that the formula of hydrogen storage material is (100-x)LiBH4+XMeO, wherein MeO is a adorning oxide, weight percent of X is 10-80%. After blending LiBH4 and the oxide according to the formula, the mixture is ball milled in protection of inert atmosphere to process surface treatment. The oxide is optional one of TiO2, Fe2O3, ZrO2, V2O5, SiO2, Al2O3, Al2O3-SiO2 or TiO2-SiO2. The intial hydrogen temperature of hydrogen storage material of the invention is lower than 100 DEG C, hydrogen amount is 3-6.5% at lower than 300 DEG C.

The invention relates to a material and technology for storing hydrogen, in particular to a novel metal ammonia borane compound hydrogen storage material and a preparation method thereof. The novel metal ammonia borane compound hydrogen storage material is prepared by taking the mixture of ammonia borane NH3BH3 and metal M or metal hydride NHy as an initial raw material and performing ball milling on the raw material in an inert protective atmosphere or a reactive hydrogen atmosphere. The molecular formula of the novel metal ammonia borane compound hydrogen storage material is MxNH(3-nx)BH3, wherein x is more than 0 and less than or equal to 1, and n is more than or equal to 1 and less than or equal to 3. The mole ratio of NH3BH3 to M or NHy in the phase composition of the raw material is 1-50:1. The preparation method provided by the invention has high efficiency and simple and easy operation. The novel metal ammonia borane compound hydrogen storage material provided by the invention has the advantages of high hydrogen storage capacity, low hydrogen production temperature, fast hydrogen production dynamics, no impurities, no gaseous pollutants and the like and has the application prospective of automobile-mounted hydrogen storage.

The invention relates to a preparation method of an NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material, in particular relates to a hydrogen storage material which improves the hydrogen desorption performance of an LiBH4-LiNH2-CaH2 system through doping NiF2 and a preparation method thereof, and belongs to the technical field of modification. The composite material is prepared by utilizing a mechanical milling method, when the doping amount of NiF2 is 5wt%, the system starts greatly desorbing hydrogen at 47 DEG C, the main hydrogen desorption peak temperature is 234 DEG C, and the hydrogen desorption amount reaches 3.75wt% at 175 DEG C within 5000s; the hydrogen desorption amount reaches 5.03wt% within 5h; the hydrogen desorption amount reaches 6wt% at 200 DEG C within 5000s; the hydrogen desorption amount reaches 6.55wt% at 270 DEG C within 1000s. The composite hydrogen storage material which is prepared by ball milling has good hydrogen storage and desorption performances, and the prepared NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material has good hydrogen desorption performance at low temperatures.

The invention provides a method for improving a hydrogen storage property of lithium borohydride, and belongs to the technical field of hydrogen storage materials. The method comprises the following steps of: mixing the lithium borohydride and alkaline-earth metal alanate according to the molar ratio of 2:1-10:1 under the protection of vacuum or inert gases, and heating mixed powder of the lithium borohydride and the alkaline-earth metal alanate to a certain temperature to ensure that the alkaline-earth metal alanate is decomposed into alkaline-earth metal hydride, aluminum or aluminum alloy in advance. By the method, double effects of in situ and concerted catalysis in the process of discharging and absorbing hydrogen of the lithium borohydride by using the alkaline-earth metal alanate are achieved, so that a hydrogen discharging temperature of the lithium borohydride is greatly reduced, and the hydrogen absorbing and discharging dynamic properties of the lithium borohydride are improved. The method is suitable for storing the hydrogen safely and efficiently and is particularly applied in fields of hydrogen fuel cells and the like.

The invention relates to the field of hydrogen storage material and hydrogen production, in particular to a multi-level ammonia borane compound hydrogen storage material and preparation and composite hydrogen release method thereof. The mixture of ammonia borane NH3BH3 and multi-metal hydride M1Mm2nHx is used as the starting material, and the multi-level ammonia borane compound hydrogen storage material is prepared by ball milling or auxiliary heat treatment in an inertia protection atmosphere or reactive hydrogen atmosphere, wherein the molecular formula of the multi-level ammonia borane compound hydrogen storage material is M1mM2n(NH2BH3)x, wherein 0<m<=4, 0<n<=4 and 1<=x<=10; the starting material comprises the phases of NH3BH3 and M1mM2nHx at a molar ratio of (1-10):1. The multi-level ammonia borane hydrogen storage material provided by the invention has obvious advantages of relatively high hydrogen storage capacity, low hydrogen release temperature, no impurity gas pollutant and the like. The composite hydrogen release technology provided by the invention effectively integrates the synthesis reaction and decomposition reaction of the multi-level ammonia borane so that the hydrogen storage system can realize high-capacity and fast hydrogen release in a proper temperature, and has application prospect in vehicular hydrogen storage.

The invention discloses a transition metal fluoride-doped composite hydrogen storage material. The material is prepared through mixing and mechanically ball-milling LiBH4, LiNH2, MgH2 and transition metal fluoride. The initial hydrogen desorption temperature of the material is 90-100 DEG C, the second-step hydrogen desorption temperature is about 150 DEG C, hydrogen desorption is mainly completedat 180-200 DEG C, and the composite hydrogen storage desorbs 6.5-7.0 wt% of hydrogen when heated to 200 DEG C. A preparation method of the material comprises the following steps: 1, weighing raw materials; and 2, carrying out a ball-milling process to prepare the composite hydrogen storage material. The composite hydrogen storage material has the following advantages: 1, the hydrogen desorption temperature is low, and the amount of hydrogen desorption heat is large; 2, the hydrogen desorption quantity is large; 3, the induction period in a second-step hydrogen desorption process used as the speed control step in the hydrogen desorption process is greatly shortened, the second-step hydrogen desorption temperature is reduced, the hydrogen desorption processes in two steps are coordinated, the hydrogen desorption reaction rate is fast, and the dehydrogenation kinetics performance is good; and 4, the cost of raw materials is low, and the synthesis method has a simple process. The preparation method has a certain application prospect in the field of hydrogen storage materials.

The invention discloses a light solid-state hydrogen storage power system for water reuse of fuel cell exhaust gas. The system is characterized in that hydrogen released from a hydrogen source systementers a hydrogen fuel cell, the exhaust gas generated by the hydrogen fuel cell and a part of the air enter a water vapor cooling device, and the cooling water condensed by the water vapor cooling device is injected into the hydrogen source system through a water outlet pipe and a water inlet pipe. The system is advantaged in that light element hydride (a light element hydride bed) is utilized, the water produced after hydrogen electrochemical reaction is recovered and returned to the hydrogen source system for hydrolysis reaction with the light element hydride to produce hydrogen, the weightof the reactant water is eliminated to increase the mass hydrogen storage amount of the system, under the same hydrogen release effect, the system mass is reduced.

The invention provides high-volume mg-based multiphase hydrogen storage material and a preparation method thereof. A fusion casting and ball milling method is adopted, which comprises the specific steps: (1) under vacuum or argon protection, Mg-Li-Al alloy ingot is melted and cast in an induction furnace; (2) the ingot is milled into fines with a milling machine and is thinning ground in a ball milling machine for 2-20 hours; (3) reaction milling is carried out under hydrogen atmosphere; the hydrogen pressure is 0.1-1 MPa; hydrogen is filled in a ball milling tank to the initial value of the hydrogen pressure at short intervals during the ball milling process; and the way of compulsory cooling is adopted to control the working temperature in the ball milling tank less than 50-60 DEG C; then the mg-based multiphase hydrogen storage material is prepared after argon packaging. The preparation process of the method and modification of the material are accomplished simultaneously. The initial hydrogen desorption peak temperature of the prepared hydrogen storage material is only 62 DEG C and the hydrogen storage amount is as high as 10.6wt percent. The hydrogen storage material is black nano-powder and has large hydrogen storage amount, low temperature and rapid speed for hydrogen desorption. The material can be used for hydrogen fuel vehicles, rechargeable batteries and fuel cells, etc. The method has moderate preparation condition, simple device and convenient operation.

The invention discloses a novel metal amine hydrogen storage material and a preparation method thereof. The material is an amine material, and comprises a compound or mixture prepared through mixing organic amine, partially boron-substituted organic amine or boron-amine or other amine compounds with lithium hydride, magnesium hydride, titanium hydride or other metal hydrides. The preparation method comprises the following steps: uniformly mixing the amine compound with the metal hydride according to a certain quantity ratio, preheating the obtained mixture to carry out a certain degree reaction, and adding a certain amount of a transition metal compound as a catalyst to obtain the hydrogen storage material. The hydrogen storage material prepared in the invention has the advantages of simple preparation method, simple and easily available raw materials, low price, large hydrogen storage capacity, and adjustable and easily-adjusted structure and performances, is very close to or has already reaches hydrogen storage material standards of American DOE, is a very promising hydrogen storage material, is suitable for large-scale production and application in the future, and has wide market prospect.

The invention discloses a high-capacity organic-inorganic composite hydrogen storage material. The organic-inorganic composite hydrogen storage material comprises an inorganic porous material and organic materials uniformly dispersed in pores of the inorganic porous material, wherein the inorganic porous material adopts porous silicon dioxide or aluminum oxide, the aperture is 0.5-20 nm, and the specific surface area is 300-500 m<2>/g; the organic materials comprise polymers serving as main chains and borane ammonia derivatives, and the borane ammonia derivatives are prepared as follows: side chains and/or end groups of the polymers are subjected to amination by polyamine compounds and grafted to the side chains and/or ends of the polymers through reaction with a borohydride. The invention further discloses a preparation method of the high-capacity organic-inorganic composite hydrogen storage material. The high-capacity organic-inorganic composite hydrogen storage material prepared with the method has the following advantages: mutual agglomeration of the polymers can be inhibited effectively, the hydrogen storage and release efficiency is high, little environmental pollution is produced, the material can be regenerated and recycled, and the cost is saved.

A high capacity polymer hydrogen storage material, including a linear high molecular polymer as a main chain. At least one side chain or a terminal group of the linear high molecular polymer is first aminated using a polyamine compound and then reacts with a borohydride to yield an ammonia borane derivative grafted to the side chain or the terminal group of the linear high molecular polymer.

The invention discloses an aluminum hydride hydrogen storage material and a preparation method thereof. The hydrogen storage material is made from aluminum and a hydrogenation catalyst. The catalyst has a general formula of M or MxOy; M represents one or more transition metals selected from Sc, Ti, V, Cr, Mn, Fe, Cu and Nb; x equals to 1 or 2; y equals to 1,2,3,4 or 5; and the molar ratio of the hydride hydrogen and the catalyst is 100:0.1-10. The invention also discloses a preparation method of the aluminum hydride hydrogen storage material. The method is as below: sealing aluminum hydride and the catalyst in a ball milling tank for mechanical milling to obtain the aluminum hydride hydrogen storage material. The aluminum hydride hydrogen storage material modified by the method can reduce hydrogen desorption temperature of the aluminum hydride hydrogen storage material, can release hydrogen at the temperature of 60 DEG C, has high hydrogen desorption amount up to 8.0 wt%, which is higher than that of the aluminum hydride hydrogen storage material modified by the prior art.

The invention discloses a high-capacity reversible hydrogen storage composite material of LiBH4 doped fluoride, and a preparation method thereof. The purpose of the invention is to solve the problems of high hydrogen desorption temperature, slow hydrogen desorption dynamics, strict afresh hydrogen absorption conditions, low generation rate and poor circularity of LiBH4 as a hydrogen storage material. A determination result shows that the hydrogen storage composite material can desorb hydrogen at about 60DEG C, and the hydrogen desorption amount at about 250DEG C can be greater than 4wt%; and the hydrogen desorption amount after multi-time cycle is still higher than 4.4wt%, so the hydrogen storage composite material has good cycle hydrogen desorption ability. The composite material can effectively solve the problems of high hydrogen desorption temperature and poor cycle hydrogen desorption performance of LiBH4, and effectively improves the hydrogen storage performance of LiBH4. The composite material can provide hydrogen for fuel cells and hydrogen-powered cells as a hydrogen source, can be widely used in the fields of electric automobiles, electronic products and military equipment, and can also be used to make mobile and portable power supplies. The preparation method has the advantages of simple process, high efficiency, reliability, and facilitation of industrial batch production.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a composite hydrogen storage material NaBH4@NiCo-NC and a preparation method thereof. The method disclosed by the invention comprises the following steps: preparing a NiCo-MOFs nanosheet; preparing a sheet-shaped carrier NiCo-NC porous carbon material; and preparing the NaBH4@NiCo-NC. Wherein the synthesis of the flaky NiCo-NC template material is controlled by controlling the temperature rise process; the loading capacity of the nano NaBH4 is 20 to 60 percent, and the mass fraction of the NiCo-NC is 80 to 40 percent. NaBH4 serving as a hydrogen storage material is poor in kinetic performance and cyclic reversibility, while by means of the method, NaBH4 in the composite material is completely reversible at the temperature of 400 DEG C, and the hydrogen desorption kinetic performance is obviously improved. Therefore, the prepared material has excellent hydrogen storage performance. The method is simple in process, easy to operate, convenient to synthesize and easy to implement.

The invention discloses a preparation method of an ammonia borane-metal catalyst composite hydrogen storage material. The preparation method comprises that through magnetron sputtering, metal atoms having catalytic effects are uniformly deposited on a mesoporous material base so that catalyst powder is obtained; the catalyst powder and ammonia borane are mixed uniformly in an anhydrous organic solvent; and the organic solvent is volatilized so that the ammonia borane-metal catalyst composite hydrogen storage material is obtained. The catalyst in the ammonia borane-metal catalyst composite hydrogen storage material has good catalytic effects on a thermolysis hydrogen desorption reaction of ammonia borane so that a hydrogen desorption temperature of ammonia borane is reduced and foreign gas escape can be inhibited effectively and hydrogen desorption dynamic features can be improved. The preparation method adopts simple equipment, and has a fast synthesis speed and a low cost. The ammonia borane-metal catalyst composite hydrogen storage material obtained by the preparation method has good product dispersibility, a wide metal selection range and obvious catalysis performances, can be massively produced easily and has a good application prospect.

The invention relates to a high-volume composite hydrogen storage material, and a synthetic method and a hydrogen desorption method thereof. The composite hydrogen storage material is synthesized through interacting a substance containing H<delta-> with a substance containing H<delta+>, wherein the ratio of the substance containing H<delta-> to the substance containing H<delta+> is 20:1-1:20. Dehydrogenation is carried out through mainly utilizing a thermal decomposition or catalytic thermal decomposition method, wherein the temperature of the thermal decomposition or the catalytic heat dehydrogenation decomposition is 0-300DEG C, and the application amount of a catalyst is 0.01-20mol%.

The invention discloses a metal amino borane composite hydrogen storage material, and belongs to the technical field of solid hydrogen storage materials. The metal amino borane composite hydrogen storage material is prepared from an alpha-LiNH2BH3 phase, a LiH phase and a hydrogen storage alloy hydride phase, LiH, NH3BH3 and a hydrogen storage alloy are used as raw materials and subjected to in-situ metallization composite ball milling, and the molar ratio of the NH3BH3 to the LiH to the hydrogen storage alloy is 1: (1.01-1.05): (0.1-0.5). Compared with ammonia borane, the metal ammonia boranecomposite hydrogen storage material has the advantages that the metal ammonia borane can rapidly release hydrogen near the room temperature, the hydrogen release kinetics is faster, no foreign gas isgenerated, the preparation process is simple, the efficiency is high, and the metal ammonia borane composite hydrogen storage material can be used for a high-safety high-density solid hydrogen sourceof a fuel cell.

The invention relates to a metal material hydrogen storage technology, and provides a preparation method of a magnesium-based hydrogen storage material coated by rare earth oxide and nano boron nickel. The preparation method comprises the following steps of dropwise adding sodium borohydride alkali liquor into a mixed solution containing rare earth and nickel, reducing the nickel to form nano amorphous boron-nickel, meanwhile, enabling the pH value of the solution to rise by the alkali liquor to generate rare earth hydroxide colloidal precipitate, then forming nano amorphous boron-nickel doped rare earth hydroxide gel, carrying out vacuum drying treatment on the gel, carrying out high-temperature drying dehydration to obtain a rare earth oxide supported nano boron-nickel composite material, mixing and ball-milling the rare earth oxide supported nano boron-nickel composite material with magnesium hydride, and dehydrogenating the magnesium hydride into magnesium metal, and obtaining the magnesium-based hydrogen storage material. Formation of magnesium-nickel alloy is avoided, and rare earth oxide remains stable, so that performance stability is kept; the hydrogen desorption temperature is reduced, and the hydrogen desorption speed is increased; the hydrogen absorption temperature of rare earth magnesium alloy is reduced and the hydrogen absorption speed is accelerated; the material can be used as a high-capacity hydrogen storage medium for manufacturing a portable power supply for commercial application.