14 results about "Desorption kinetics" patented technology

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.

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.

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.

The application discloses a biomass carbon material loaded with iron oxide and a preparation method and application thereof, and belongs to the technical field of carbon capture and catalysis. The biomass carbon material is prepared by taking natural biomass as raw material, pretreating, drying, crushing and carbonizing; fumaric acid and soluble iron salt are prepared into a precursor solution, the biomass carbon is dispersed in the solution, iron-based organic framework material is in-situ grown on the surface of the carbon carrier through a hydrothermal reaction, and then washing, drying and high-temperature pyrolysis under an inert atmosphere are carried out to obtain the biomass carbon material loaded with iron oxide nanoparticles. The material has the characteristics of large specific surface area, uniformly dispersed active sites and stable structure, and can be used for catalyzing the desorption process of carbon dioxide in alcohol amine rich solution, effectively strengthening the desorption kinetics and reducing the regeneration energy consumption. The application has the advantages of wide raw material source, simple process, green environmental protection and excellent catalytic effect, and provides a new and efficient solution for low-carbon emission reduction and carbon capture technology upgrading.

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 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.

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.

This invention provides a humidity-fluctuation-resistant nanofiber hygroscopic hydrogel, its preparation method, and its applications. Through electrospinning and sequential ion exchange strategies, a nanofiber hygroscopic hydrogel with a hierarchical three-dimensional nanofiber network structure is prepared using sodium alginate nanofiber membranes. A dual spatial constraint mechanism is constructed, consisting of gel swelling confinement within the fibers and capillary channel confinement between fibers. This hydrogel maintains high moisture absorption capacity, fast adsorption / desorption kinetics, and good structural stability over a wide humidity range, especially in high-humidity environments and under humidity fluctuation conditions. It exhibits significant humidity fluctuation resistance and is suitable for efficient atmospheric water collection in all weather conditions and multiple climate zones. This invention fills the application gap of existing adsorption-based atmospheric water collection technologies in dynamic humidity environments and provides a material basis for the stable operation of adsorbents in practical environments, demonstrating significant application value.

This invention relates to hydrogen energy, specifically to the development of composite materials based on boron nitride (BN) with alloying additives for efficient hydrogen storage. The invention proposes a method for producing hydride materials based on boron nitrides with alloying components, pertaining to the storage of hydrogen in solid materials produced using spark plasma sintering technology. The objective of the proposed technical solution is to develop a method for producing hydride composite materials based on boron nitride with alloying additives, ensuring high hydrogen storage capacity and stability during cyclic use. The technical result of using the invention is to increase the material's hydrogen absorption capacity and improve its thermodynamic properties through the optimal selection of alloying elements and synthesis conditions. The essence of the invention lies in the development of a method for producing hydride composite materials based on boron nitrides (BN) with alloying additives (C, Al, Ti), as well as with a combination of methods of high-energy processing of a powder mixture (mechanical activation and heat treatment in an inert environment) providing optimal structural and thermodynamic properties of materials for the efficient storage of hydrogen. A method for producing a composite material for storing hydrogen based on the BN-C-Al-Ti system is proposed, which includes grinding a powder mixture followed by mechanical activation in a ball mill and heat treatment, characterized in that that mechanochemical activation in a planetary mill at a speed of 300-500 rpm for 8-12 hours with a mass ratio of balls to powder of 20:1 is carried out for each powder, followed by heat treatment in an inert environment at 900-1100°C for 2-4 hours at a pressure of 0.1-0.5 MPa, grinding of the cooled components to a particle size of <10 μm and obtaining a composite material with increased hydrogen capacity of >6 wt.% H₂, improved sorption / desorption kinetics and stable resource durability without degradation of properties after 500 cycles.

The present invention relates to the interdisciplinary fields of new energy materials and thermochemical energy storage technology. Disclosed are a thermochemical energy storage composite material with a bionic ordered structure and a preparation method therefor. By means of an optimization strategy of the coordination of a "geometry-internal channel-surface effect", efficient adsorption / desorption kinetics and solar energy direct drive heat storage are realized. The thermochemical energy storage composite material comprises a matrix with a bionic multi-scale mass transfer structure and a hygroscopic inorganic salt, which is uniformly loaded inside the matrix, wherein the matrix is activated by KOH and is then loaded with the hygroscopic inorganic salt. The appearance of the matrix imitates that of a red blood cell, and the matrix has the shape of a single concave disc; and the inside of the matrix has a layered directional vein network imitating the shape of leaf veins. The present invention solves the problems of moisture absorption and caking, slow mass transfer and the low photothermal conversion efficiency of a traditional hydrated salt material, and provides a new solution for the efficient storage of renewable energy sources.

This invention relates to a high-capacity solid-solution magnesium-based hydrogen storage alloy for low-temperature hydrogen absorption and its preparation method. The purpose of this invention is to solve the problems of slow kinetics and unstable cycle performance in magnesium-based hydrogen storage alloys. The solid-solution magnesium-based hydrogen storage alloy is Mg... 100‑x Sc x Cast alloy. The preparation method is as follows: raw materials are weighed according to atomic ratio, then vacuum dried, and then melted at a temperature of 750-850℃. After uniform stirring, the mixture is cast into a mold to obtain a cast alloy. This invention adds the rare earth element Sc, which causes a change in the Mg lattice by the addition of solid solution element Sc, thus disrupting the stability of MgH2. Simultaneously, Sc has stronger metallic properties than Mg, preferentially forming the ScH2 catalytic phase, thereby improving the hydrogen absorption and desorption kinetics rate. This invention is applied in the field of solid-state hydrogen storage.