37 results about "Desorption kinetics" patented technology

Metal organic framework compositions and methods for O2 gas separations from ambient air and Ar gas stream purifications are provided. The metal-organic framework has the formula of CuX-MFU-4l, where X=2.2-2.7 and MFU=Metal- Organic Framework Ulm #4, large with optimized performance for Cu2.7-MFU-4l, (Cu2.7Zn2.3H0.4Cl0.9(btdd)3). The frameworks adsorb O2 from ambient air in the presence of water with both excellent cyclability and rapid adsorption and desorption kinetics. Differences in the kinetics of O2 and N2 desorption following adsorption allow for isolation of high-purity O2 following desorption, offering high-purity O2 without costly, multi-step separations. The framework Cu2.7-MFU-4l is further able to remove both N2 and O2 impurities from Ar streams.

The application provides a kind of test device and method of gas-liquid competitive adsorption under the simulation reservoir electric field environment, it is related to oil and gas field development experimental simulation technical field, the device includes QCM-D host computer, special electric field flow cavity, high voltage power supply, fluid injection system and signal isolation and shielding system;The method comprises: establishing baseline, monitoring crude oil adsorption kinetics, under the application of high voltage electric field, monitoring displacement gas competitive desorption kinetics, and generating evaluation results based on frequency and dissipation dual parameter changes.The application realizes real-time, in-situ, quantitative monitoring of gas-liquid competitive adsorption microprocess on the surface of QCM-D chip under the environment of kilovolt high voltage electric field for the first time through vertical transmission type non-contact electric field loading cavity and high voltage-weak signal isolation circuit, and can distinguish the different effects of electric field on mass desorption and interface rheological change, providing a reliable experimental tool and analysis method for revealing the micro mechanism of electric field enhanced oil displacement.

The application discloses a kind of catalyst doped magnesium-based hydrogen storage materials and preparation method thereof, belong to hydrogen storage material and its preparation technical field.The application improves the hydrogen absorption and desorption kinetics of existing magnesium-based hydrogen storage material, reduces its hydrogen desorption activation energy, and solves the problem of poor cycle stability.The application uses Cu (NO3) 2·H2O and H3BTC raw materials to prepare catalyst with porous structure, and dopes it in magnesium-based hydrogen storage material by ball milling technology, utilizes the porous structure of catalyst to avoid the agglomeration of active material during hydrogen absorption and desorption process, and the introduced metal can be used as catalytic site to improve the hydrogen absorption and desorption kinetics of magnesium-based hydrogen storage material Mg 85 Ni 10 La 4.5 Y 0.5 Desorption activation energy.

Achieving the selective and reversible adsorption of CO2 from humid, low partial pressures streams such as the flue gas resulting from the combustion of natural gas in combined cycle power plants ( 4% CO2) is challenging due to the need for high thermal, oxidative, and hydrolytic stability as well as moderate regeneration conditions to reduce the energy of adsorption / desorption cycling. Appending cyclic primary, secondary diamines, exemplified by 2-(aminomethyl)piperidine (2-ampd), to the metal-organic frameworks Mg2(dobpdc) (dobpdc4- = 4,4-dioxidobiphenyl-3,3-dicarboxylate), Mg2(dotpdc) (dotpdc4- = 4,4"-dioxido-[1,1':4',1"-terphenyl]-3,3"dicarboxylate) or Mg2(pc-dobpdc) (pc-dobpdc4-- = dioxidobiphenyl-4,4'-dicarboxylate) produces adsorbents of the classes EMM-44, EMM-45, and EMM-46, respectively, that display step-shaped adsorption of CO2 at the partial pressures required for 90% capture from natural gas flue gas at temperatures up to or exceeding 60 °C. Using a cyclic diamine in place of a diamine functionalized with bulky alkyl groups enables fast adsorption / desorption kinetics with sharp CO2 adsorption and desorption steps.

The invention relates to an easy-to-activate AB5 type multi-element doped modified hydrogen storage material and a preparation method and application thereof, the chemical general formula of the hydrogen storage material is LaxCeyNdzNiaFebMnc, x + y + z = 1, x is greater than or equal to 0.5, y is greater than or equal to 0 and less than or equal to 0.5, and z is greater than or equal to 0 and less than or equal to 0.5; a + b + c = 5, a > = 4, 0 < = b < = 1, 0 < = c < = 1, and at least two of y, z, b and c are not equal to 0. Compared with the prior art, the single-phase AB5 type hydrogen storage alloy with a hexagonal crystal form is prepared by synergistically replacing A site (La) by Ce / Nd and replacing B site (Ni) by Fe / Mn according to a specific proportion, the alloy has relatively high hydrogen storage capacity and rapid hydrogen absorption and desorption dynamic performance, the hysteresis of a hydrogen absorption and desorption platform is obviously improved, and rapid hydrogen absorption and the like can be completed without hydrogen absorption and desorption activation.

The invention discloses a molecular dynamics simulation method for electron-induced gas desorption, and belongs to the technical field of molecular simulation. The method comprises the following steps: firstly, constructing an aluminum oxide molecular model, and then simulating adsorption equilibrium of hydrogen on the surface of aluminum oxide at different temperatures and air pressures by adopting a giant regular Monte Carlo method to obtain a stable adsorption configuration; then, based on the configuration, an electron force field is adopted to introduce explicit electron particles to simulate electron beam bombardment, and an electron-induced gas desorption kinetic process is simulated under a molecular dynamics framework; and finally, performing quantitative analysis on the desorption product. Through full-atom molecular dynamics simulation, coherent research from gas adsorption to electron-induced desorption is realized, the limitation that related experimental measurement is difficult and a micromechanism is difficult to reveal under a high-voltage condition is overcome, and an effective simulation tool is provided for deeply understanding a physical mechanism of dielectric surface gas desorption-induced discharge.

The application discloses a preparation method of a metal-catalyzed lithium borohydride composite hydrogen storage material, which comprises the following steps: mixing raw materials including lithium borohydride and a ferrocene salt, and performing ball milling to obtain the metal-catalyzed lithium borohydride composite hydrogen storage material; the ferrocene salt is selected from one or more of nickelocene, chromocene and manganocene. The preparation method disclosed by the application is simple and controllable, is suitable for large-scale industrial production, and more importantly, the prepared composite hydrogen storage material has the advantages of low hydrogen absorption and desorption temperature, good hydrogen absorption and desorption kinetics, high cycle stability and the like without reducing the high theoretical capacity of lithium borohydride.

The present application relates to a kind of dynamic crosslinking hygroscopic hydrogel and its preparation method.The raw materials include hydroxyl-containing water-soluble polymer material, boric acid crosslinking agent and hygroscopic salt material.The preparation method includes the preparation of gel precursor solution, the configuration of crosslinking agent solution, crosslinking reaction process and gelation process in mold.The borate ester bond crosslinking site in hydrogel can occur reversible hydrolysis reaction, and the crosslinking density of dynamic hydrogel is determined by the water content in gel.The dynamic crosslinking hygroscopic hydrogel with this characteristic has higher hygroscopic salt load and hygroscopic capacity than conventional covalent bond crosslinking hygroscopic hydrogel, faster hygroscopic / desorption kinetics performance and easy recycling, easy large-scale production characteristics.The present application also discloses the specific application of the dynamic crosslinking hygroscopic hydrogel, including solar air collection, closed space drying and dehumidification, evaporation heat dissipation and the like.

The invention relates to a magnesium-based hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage alloy materials and preparation thereof. The hydrogen storage material is an Mg-5Ni alloy with Sm powder uniformly distributed on the surface layer and an amorphous / nanocrystalline structure in the interior. The Sm powder is wrapped by the surface layer of the Mg-5Ni alloy to form composite powder of a core-shell structure; the hydrogen storage material is prepared from Mg-5Ni alloy powder and Sm powder as raw materials, and the raw materials are mixed and then subjected to dry ball milling. The hydrogen absorption and desorption kinetics of the existing magnesium-based hydrogen storage material can be effectively improved, the hydrogen desorption activation energy of the magnesium-based hydrogen storage material is reduced, and the problem that a solid additive is difficult to uniformly distribute on the surface is solved.

The invention discloses a high-cycle-stability absorption liquid for capturing carbon dioxide and a preparation method and application thereof, and relates to the technical field of gas separation and purification, the absorption liquid comprises a main absorption component, an auxiliary absorption component, an active component, an additive and a solvent; the additive is 4, 4 '-dihydroxy diphenyl ether and 3-methyl-3H-imidazole methyl [4, 5-b] pyridine-6-carboxylate; the solvent is water. The absorption liquid provided by the invention can be used for capturing carbon dioxide in industrial waste gas, has excellent carbon dioxide absorption and desorption capacity and rapid absorption and desorption kinetics, improves the CO2 absorption load capacity, has excellent absorption and desorption rate and low-temperature capturing performance, and has better stability in long-period operation. In addition, the method solves the problems of cost, energy consumption, environment compatibility and the like, and has a good application prospect.

The invention relates to the use of a lamellar uranium-bearing material intercalated with molecules of an organic compound, which, thanks to this intercalation, is capable of reversibly and permanently absorbing water molecules, with high sorption / desorption kinetics and high energy density, making it a material of choice for thermal energy storage by water sorption. It also relates to a thermal energy storage process using this material, a thermal energy storage device for implementing this process, and a new intercalated lamellar uranium-bearing material. Applications: any field where thermal management needs to be optimized, whether for buildings, industrial structures, or urban heating networks, by recovering thermal energy produced on-site and subsequently redistributing it, according to needs, to that site or any other site.

The invention relates to the technical field of hydrogen storage materials, in particular to a MgH2-containing zirconium carbide-based MOF composite material as well as a preparation method and application thereof. The zirconium carbide-based MOF composite material comprises C / Zr-BTC and MgH2, the C / Zr-BTC is obtained by calcining and carbonizing Zr-BTC, and the specific surface area of the MOF composite material is 1105-1623 m < 2 > / g. The MgH2-C / Zr-BTC composite material is prepared by loading a high-capacity hydrogen storage material MgH2 to channels and surfaces of C / Zr-BTC through a mechanical ball milling method, in the composite material, the high specific surface of Zr-BTC provides rich physical adsorption sites for hydrogen molecules, the channel structure of Zr-BTC effectively limits growth and agglomeration of MgH2 nanoparticles, and the hydrogen absorption and desorption kinetics of MgH2 is remarkably improved; and meanwhile, by introducing MgH2, the total hydrogen storage capacity of the composite material is greatly improved.

The application discloses a kind of pollution adsorbent particle residual adsorption amount determination method and system, it is related to pollution adsorbent particle desorption research technical field.The application constructs improved Lan* desorption kinetics model;Based on origin software and desorption kinetics experimental data, the coefficient in improved Lan* desorption kinetics model is fitted, and residual adsorption amount prediction model of pollution adsorbent particle is obtained;Target desorption time is substituted into residual adsorption amount prediction model of pollution adsorbent particle, and the residual adsorption amount of unit mass pollution adsorbent particle at target desorption time is determined.The application can quickly complete the prediction of the residual adsorption amount of adsorbate of unit mass adsorbent at any desorption time by introducing solid-liquid ratio to construct improved Lan* desorption kinetics model.

This invention provides a method for preparing a multidimensional powdered hydrogen storage material with high mass transfer and high heat transfer, relating to the field of hydrogen storage material preparation technology. The method includes the following steps: selecting hydrogen storage material particles as the initial hydrogen storage material, selecting a metal mesh or foam material as a two-dimensional or three-dimensional framework, and adding a pore-forming agent to an organic solvent containing a high-temperature resistant resin to obtain a binder solution; under the assistance of the binder solution and ultrasonic vibration, uniformly filling the pores of the framework with the hydrogen storage material particles; and heating and curing the filled material under an argon atmosphere to obtain the multidimensional powdered hydrogen storage material with high mass transfer and high heat transfer. Compared to the initial powdered hydrogen storage material, the multidimensional powdered hydrogen storage material prepared by this invention has a thermal conductivity increased by more than 7 times, the time to absorb hydrogen to 90% saturation capacity is shortened by 22% to 54% compared to traditional processes, and the effective hydrogen storage capacity, hydrogen absorption and desorption kinetics, and cycle life of the initial powdered hydrogen storage material are significantly improved.

The invention discloses an atmospheric water collection membrane based on selective swelling and non-solvent induced phase separation and a preparation method thereof. According to the atmospheric water collection membrane, an amphiphilic block copolymer serves as a membrane forming material and is dissolved in an organic solvent, a porous flat membrane with vertical finger-shaped pore channels is prepared through non-solvent induced phase separation, the porous flat membrane is immersed in a mixed swelling agent to be treated, the pore channels are blocked through a hydrophobic block of a selective swelling membrane, and the atmospheric water collection membrane is obtained. The atmospheric water collection membrane has excellent water collection performance and rapid adsorption and desorption kinetics, the preparation method is simple and low in cost, non-solvent induced phase separation and selective swelling are combined, continuous large-scale production of the atmospheric water collection membrane can be achieved, and the atmospheric water collection membrane is easy to amplify and suitable for industrial production.

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.

The invention discloses an AB2 type titanium-manganese alloy composite hydrogen storage material and a preparation method thereof, and relates to the technical field of solid hydrogen storage material preparation. The material comprises an AB2 type titanium-manganese alloy and magnesium hydride which are compounded according to a specific proportion, and the material is prepared through intermittent high-energy ball milling, gradient heat treatment and cold press molding processes. In the preparation process, an interface bicontinuous structure is optimized by regulating and controlling the composite proportion, interface atoms are promoted to be mutually diffused to form a gradient transition phase through gradient heat treatment, grain refinement and lattice defect density are controlled in combination with intermittent ball milling, and hydrogen diffusion channel construction and hydrogen storage active site collaborative optimization are achieved. Through cooperative regulation and control of multiple process parameters, the hydrogen absorption and desorption dynamic performance, the cycling stability and the hydrogen storage capacity of the composite hydrogen storage material are effectively improved, and the composite hydrogen storage material is suitable for efficient hydrogen storage systems and hydrogen energy related fields.

A method for analyzing the impact of leakage rate on water vapor pumping behavior in high vacuum systems is proposed. This method quantifies the external leakage rate of water vapor in the system through static pressure rise experiments and obtains experimental pumping curves under various internal configurations. A three-dimensional finite element model is established based on the actual geometry, incorporating a heterogeneous adsorption-desorption kinetic equation where adsorption energy varies logarithmically with surface coverage. Key parameters such as adhesion coefficient and adsorption site density are calibrated using multiple sets of experimental curves. Finally, after verifying the quasi-static equilibrium condition, the influence of different leakage rates and leak spatial distribution on the pumping process and the spatial uniformity of intracavity pressure is quantitatively simulated based on the calibrated model. This invention solves the problems of traditional models relying on empirical parameters and neglecting the spatial effect of leakage rate, providing accurate quantitative basis for the sealing design, leak diagnosis, and performance optimization of high vacuum systems.

This invention discloses a multi-element Mg-based hydrogen storage alloy and its preparation method, belonging to the field of solid-state hydrogen storage materials technology. The alloy is a pentagonal alloy of Mg-Ni-Ce-Cu-Y, containing, by atomic percentage, 1%–5% Ni, 0.1%–3% Ce, 0.1%–3% Cu, and 0.1%–3% Y, with the balance being Mg and unavoidable impurities. The preparation method employs melting, cutting, low-energy ball milling, and pressing processes, using metal hydrides as ball milling control agents, making it environmentally friendly and safe. This invention utilizes multi-element synergistic catalysis to construct multi-level hydrogen diffusion channels, significantly reducing the hydrogen desorption activation energy and temperature, and improving hydrogen absorption and desorption kinetics. Furthermore, the process is simple, suitable for large-scale production, and can be widely applied in the field of solid-state hydrogen storage.

This invention relates to a high-capacity Mg-RE(Sm,Nd)-Ca-Cu-Zn hydrogen storage composite material catalyzed by K2TiF6+Nb2O5, belonging to the field of solid-state hydrogen storage materials technology. It solves one of the problems of existing magnesium-based hydrogen storage materials, namely, high thermodynamic stability, complex activation process, high hydrogen desorption temperature, and slow hydrogen absorption / desorption kinetics. This invention discloses a Mg-based solid-state composite hydrogen storage material, the composition of which is: Mg... 95‑x‑y Sm x Nd y Ca2Cu 3‑z Zn z +m wt.%(K2TiF6+Nb2O5), where x, y, and z are atomic ratios, and 0.5≤x≤2, 0.5≤y≤2, 0.2≤z≤3, m is the percentage of K2TiF6+Nb2O5 in the alloy, 4≤m≤10, the mass ratio of K2TiF6 to Nb2O5 is 1:1, the preferred atomic ratio is 1.5:1.5:0.8, m=6. This high-capacity Mg-RE(Sm,Nd)-Ca-Cu-Zn-based solid hydrogen storage composite material has high hydrogen absorption and desorption capacity and excellent hydrogen absorption and desorption kinetics; moreover, the preparation process is simple and easy to operate, suitable for large-scale preparation, and can be used as a hydrogen storage / hydrogen supply carrier in various scenarios.

The invention discloses an experimental device for simulating dynamic change of gas concentration in a coal mining process, and belongs to the technical field of coal mine safety. The device comprises a coal seam simulation chamber and a mining space simulation chamber, and a dynamic mining simulation unit composed of a shaft screw conveyor with adjustable rotating speed is arranged between the coal seam simulation chamber and the mining space simulation chamber so as to simulate the coal cutting and gas dynamic desorption process of a coal mining machine. The mining space simulation chamber is provided with a controllable ventilation unit and a multi-point monitoring unit, and comprises a sampling port for simulating a return airway, a working face and an upper corner and a plurality of concentration testing ports. Four-field coupling dynamic simulation of a stress field, a mining field, a seepage field and a concentration field is realized by independently regulating and controlling the coal bed gas pressure, the spiral rotating speed and the ventilation air quantity. According to the method, desorption kinetics and inversion diffusion parameters can be quantitatively analyzed from the collected spatio-temporal data, safety indexes are extracted, a prediction model is constructed, and a reliable experiment and data platform is provided for gas disaster prevention and control.

The application discloses a kind of hierarchical porous carbon calcium chloride composite heat storage materials and preparation method thereof, comprising: multi-walled carbon nanotube is treated to obtain carboxyl functionalized multi-walled carbon nanotube;Thickening agent is dispersed into graphene oxide, carboxyl functionalized multi-walled carbon nanotube is added, and ink is obtained;The ink is formed wet three-dimensional structure by DIW process printing;Wet three-dimensional structure is dried, carbonized, and three-dimensional hierarchical porous carbon skeleton is obtained;Three-dimensional hierarchical porous carbon skeleton is immersed in calcium chloride aqueous solution and heat treated, and hierarchical porous carbon calcium chloride composite heat storage material is obtained.The hierarchical porous carbon calcium chloride composite heat storage material of the application has high salt limit ability, fast water absorption and desorption kinetics, high energy storage density and excellent cycle stability, and still maintains structural integrity after multiple adsorption / desorption cycles, without salt migration, leakage or pore collapse phenomenon, suitable for low-temperature thermochemical energy storage, solar thermal utilization and thermal management system, with significant engineering application prospect.

The invention relates to a high-capacity and easy-to-activate Ti-Zr-La-Mn-Cr-(VFe) series AB2 type hydrogen storage alloy and a preparation method thereof, and belongs to the technical field of solid hydrogen storage alloy materials. The invention relates to a Ti-Zr-La-Mn-Cr-(VFe) series AB2 type hydrogen storage alloy and a preparation method thereof, solves the problems of high activation condition, long activation period, overhigh hydrogen absorption platform pressure, large batch preparation smelting difficulty, low yield, high raw material cost and the like of the traditional Ti-Mn based hydrogen storage alloy in the prior art, and provides the Ti-Zr-La-Mn-Cr-(VFe) series AB2 type hydrogen storage alloy, the specific composition of the alloy is Ti 1.05-x-y ZrxLayMn2-z-mCrz (VFe) m, x, y, z and m in the formula are atomic ratios, x is greater than or equal to 0.10 and less than or equal to 0.35, and y is greater than or equal to 0.20 and less than or equal to 0.30. X is more than or equal to 0.01 and less than or equal to 0.03, z is more than or equal to 0.40 and less than or equal to 0.90, m is more than or equal to 0.10 and less than or equal to 0.30, preferably, the ratio of x to y to z to m is 0.30: 0.02: 0.7: 0.15, and the hydrogen storage alloy has good activation performance, hydrogen absorption and desorption dynamic performance, cycle stability and hydrogen storage capacity gt; %, and hydrogen absorption and hydrogen desorption platform pressure can be adjusted according to application requirements; under the conditions that the temperature is 20 DEG C and the initial hydrogen pressure is 3 MPa, complete activation can be achieved through one-time hydrogen charging and discharging circulation, the circulation stability is good, and after 200-time hydrogen charging and discharging circulation, the capacity retention rate is S200gt; the hydrogen storage material can be widely applied as a solid hydrogen storage material.

This invention relates to a method for preparing spherical carbon-coated FeCo2O4 nanocatalysts and their applications, belonging to the field of hydrogen storage material catalysts. The preparation method involves mixing ferric chloride hexahydrate, cobalt acetate tetrahydrate, nickel acetate tetrahydrate, and terephthalic acid to obtain a mixed aqueous solution. This solution is then placed in a polytetrafluoroethylene-lined high-pressure reactor, heated to 180°C at a rate of 5°C / min, and held at this temperature for 8-12 h for a solvothermal reaction. After cooling, separation, washing, and drying, a light yellow precursor powder is finally obtained. This invention, through the rational proportioning of different raw materials and high-temperature, high-pressure reaction, grinding, calcination, and cooling (calcination temperature 400°C), obtains spherical carbon-coated FeCo2O4 nanocatalysts with excellent catalytic performance, significantly improving the hydrogen absorption and desorption kinetics of MgH2.

This invention discloses a nano-solid-state hydrogen storage material and its preparation method, belonging to the field of new energy materials technology. The nano-solid-state hydrogen storage material has a core-shell structure, comprising a nano-magnesium-based active phase core and a functionalized porous carbon material outer shell; the core contains in-situ grown multi-metal nanocatalyst particles; the outer shell is doped with non-metallic elements and loaded with metal-organic framework derivative nanoparticles; the core-shell structure is dispersed in a three-dimensional interconnected carbon-based network framework. The preparation method includes: preparing a multi-metal-organic framework precursor solution; synthesizing multi-metal-organic framework nanoparticles using a solvothermal method; chemically combining with a magnesium source and a nickel source to obtain a precursor composite; carbonization treatment to obtain a porous carbon-coated multi-metal nanocatalyst@magnesium-based composite material; constructing a three-dimensional network framework by combining with a functionalized carbon source and metal-organic framework derivatives; and high-pressure hydrogenation treatment. The material of this invention exhibits a low hydrogen desorption temperature, rapid hydrogen absorption and desorption kinetics, and excellent cycle stability.

This invention relates to a method for preparing a Mg-based hydrogen storage alloy with Mg2Cu / Mg2Ni dual-phase synergistic catalysis, comprising the following steps: S1: Mg2Cu / Mg2Ni hydrogen storage alloy with atomic percentage of general formula... 40 Ni 10‑x Cu x S2: Weigh the raw materials according to the specified proportions; S3: Place the raw materials in the crucible of the melting furnace and melt them under a protective atmosphere. During the melting process, intermittent electromagnetic stirring is performed. After cooling, a cast alloy ingot is obtained; S4: After surface polishing and cyclic deep cryogenic treatment, the cast alloy ingot is mechanically crushed into particles with a particle size of less than 2 mm; S5: Place the particles in a ball mill jar and perform high-energy ball milling under an inert protective gas. After ball milling, the particles are sieved to obtain a hydrogen storage alloy. This invention forms an interwoven and coupled Mg2Cu / Mg2Ni dual-phase synergistic structure through appropriate doping of Cu, which significantly improves the hydrogen absorption and desorption kinetics while maintaining a high hydrogen storage capacity. The method is process-controllable, has uniform composition, and is suitable for large-scale preparation.

This invention discloses a method for preparing a Mo-doped VO2-catalyzed magnesium hydride hydrogen storage material and its product. The preparation method includes: (1) mixing a vanadium source, a molybdenum source, a reducing agent, and water to obtain a raw material solution, and then preparing a Mo-doped VO2 catalyst through a hydrothermal synthesis reaction; (2) ball milling and mixing the Mo-doped VO2 catalyst prepared in step (1) with magnesium hydride to obtain the Mo-doped VO2-catalyzed magnesium hydride hydrogen storage material. The preparation method disclosed in this invention is simple, controllable, energy-efficient, and easy to implement. The prepared composite hydrogen storage material system greatly improves the hydrogen absorption and desorption kinetics of MgH2, significantly reduces the hydrogen absorption and desorption temperature of MgH2, and improves the cycle stability of the material.

The invention provides a testing device and method for simulating gas-liquid competitive adsorption in a reservoir electric field environment, and relates to the technical field of oil and gas field development experiment simulation, the device comprises a QCM-D host, a special electric field flow cavity, a high-voltage power supply, a fluid injection system and a signal isolation and shielding system; the method comprises the steps of establishing a base line, monitoring crude oil adsorption kinetics, monitoring displacement gas competition desorption kinetics under the condition that a high-voltage electric field is applied, and generating an evaluation result based on frequency and dissipation double-parameter changes. According to the invention, through the vertical transmission type non-contact electric field loading cavity and the high voltage-weak signal isolation circuit, real-time, in-situ and quantitative monitoring of the gas-liquid competitive adsorption microscopic process on the surface of the QCM-D chip in a kilovolt-level high-voltage electric field environment is realized for the first time, and different effects of the electric field on mass desorption and interface rheological property change can be distinguished; and a reliable experimental tool and an analysis method are provided for revealing a microscopic mechanism of electric field enhanced oil displacement.

The application relates to a high-capacity Mg-Y-Al-Sn-based solid-state hydrogen storage composite material and a preparation method thereof, and belongs to the technical field of hydrogen storage materials. The application solves one of the problems in the prior art, such as high thermodynamic stability of a hydrogen storage material, complex activation process, high dissociation temperature, slow hydrogenation / dehydrogenation kinetics and the like. The application discloses a Mg-based solid-state hydrogen storage composite material, which is composed of 100 parts of Mg 94‑x Y x Al 6‑y Sn y , 2-6 parts of AlF3 and Cr2O3 and other inevitable impurities; in the formula, x and y are atomic ratios, and 1<=x<=4 and 0.5<=y<=3. The high-capacity Mg-Y-Al-Sn-based solid-state hydrogen storage composite material has high hydrogen absorption and desorption capacity and excellent hydrogen absorption and desorption kinetics; the preparation process is simple and easy to operate, is suitable for large-scale preparation, and can be widely applied to a hydrogen fuel cell field as a hydrogen storage / hydrogen supply carrier.