30 results about "Transition metal hydride" patented technology

The present invention relates to an advanced preparation method of organic-transition metal hydride used as hydrogen storage materials, the method including: preparing organic-transition metal-aluminum hydride complexes by reacting the organic-transition metal halide with metal aluminum hydride compounds; and preparing the organic-transition metal hydride by reacting the organic-transition metal aluminum hydride complexes with Lewis bases. Since the preparation method of the organic-transition metal hydride according to the present invention does not use catalysts, it has advantages that it does not cause problems due to poisoning and can prepare the organic-transition metal hydride at high yield under less stringent conditions. The hydrogen storage materials containing the organic-transition metal hydride prepared from the preparation method can safely and reversibly store a large amount of hydrogen.

The present invention relates to an advanced preparation method of organic-transition metal hydride used as hydrogen storage materials, the method including: preparing organic-transition metal-aluminum hydride complexes by reacting the organic-transition metal halide with metal aluminum hydride compounds; and preparing the organic-transition metal hydride by reacting the organic-transition metal aluminum hydride complexes with Lewis bases.Since the preparation method of the organic-transition metal hydride according to the present invention does not use catalysts, it has advantages that it does not cause problems due to poisoning and can prepare the organic-transition metal hydride at high yield under less stringent conditions. The hydrogen storage materials containing the organic-transition metal hydride prepared from the preparation method can safely and reversibly store a large amount of hydrogen.

Cyclic esters are polymerized in the presence of a catalytic amount of a Group 4 transition metal hydride. The method is capable of producing high molecular weight polyesters with low polydispersities. These high molecular weight polyesters exhibit improved mechanical properties and are useful in a variety of product applications.

The present invention relates to substances which can be applied to the technical fields of gas storages, polymerization catalysts and optical isomers, their intermediates, and processes for preparing the same, which is characterized in that 1) possible disintegration of structure of the scaffold material (SM) is impeded, and 2) they are prepared by a simple manufacturing system as compared to the substances conventionally suggested in the application field. Specifically, it relates to scaffold material-transition metal hydride complexes comprised of scaffold material (SM) and transition metal hydride (M1H(n-1)) which is chemically bonded to the functional groups formed on the scaffold material, SM-transition metal halide complex and SM-transition metal ligand complex as the precursors, and a process for preparing the same. The SM-transition metal hydride complex according to the present invention is a substance for hydrogen storage which adsorbs hydrogen via Kubas adsorption. The complex according to the invention can store high capacity of hydrogen with safety and reversibility, while disintegration of its structure does not occur even with repeated adsorption-desorption of hydrogen.

Disclosed is a catalyst and process for producing ammonia (NH3). The process includes contacting a gaseous feed mixture comprising nitrogen (N2) and hydrogen (H2) with a metal hydride material under reaction conditions sufficient to produce a product stream comprising NH3.

Cyclic esters are polymerized in the presence of a catalytic amount of a Group 4 transition metal hydride. The method is capable of producing high molecular weight polyesters with low polydispersities. These high molecular weight polyesters exhibit improved mechanical properties and are useful in a variety of product applications.

The present invention relates to an improved preparation method of an organic-transition metal hydride as a hydrogen storage material, especially an improved preparation method of an organic-transition metal hydride containing aryl or alkyl group that facilitates safe and reversible storage of a massive amount of hydrogen. The present invention also relates to a preparation method of an organic-transition metal hydride comprising the steps of: preparing a complex reducing agent composition by reacting alkali metal, alkali earth metal or a mixture thereof and a C10 to C20 aromatic compound in aprotic polar solvent; and preparing the organic-transition metal hydride by reacting the prepared complex reducing agent composition with an organic-transition metal halide in the absence of a hydrogen source. The method has the advantages of minimizing the number and amount of byproducts by using a complex reducing agent and producing an organic-transition metal hydride safely without denaturation under more moderate reaction conditions.

The present invention relates to a more advanced preparation method of organic-transition metal hydride as a hydrogen storage material, precisely a more advanced preparation method of organic-transition metal hydride containing aryl or alkyl group that facilitates safe and reverse storage of massive amount of hydrogen.The present invention relates to a preparation method of an organic-transition metal hydride comprising the steps of preparing a complex reducing agent composition by reacting alkali metal, alkali earth metal or a mixture thereof and (C10˜C20) aromatic compound in aprotic polar solvent; and preparing organic-transition metal hydride by reacting the prepared complex reducing agent composition and organic-transition metal halide.The method of the present invention has advantages of minimizing the numbers and the amounts of byproducts by using a complex reducing agent and producing organic-transition metal hydride safely without denaturation under more moderate reaction conditions.

It is an object of the present invention to provide a method, at least in part, for improving the performance of photocatalysts (semiconductor photocatalysts) by incorporating a metal (for example, a metal ion of a late transition metal, such as Nickel) adheres to the surface of the semiconductor (photocatalyst). More specifically, 1,2-ethanedithiol (EDT) acts as an excellent molecule for adhering a transition metal complex such as nickel (Ni2+ ion) to the surface of a semiconductor material used to form a cadmium sulfide surface linking agent (organic ligand). The photocatalyst has a special role in hydrogen evolution from hydrogen sulfide.

The invention relates to the field of hydrogen storage materials, and discloses a preparation method of a graphene-supported nano-flaky transition metal hydride and a hydrogen storage material. The preparation method of the nano-flaky transition metal hydride includes the following steps: under the protection of an inert gas , mixing transition metal chloride, lithium hydride, graphene and an organic solvent, separating and obtaining a solid substance after heating and reacting, and drying the solid substance to obtain the nanosheet-shaped transition metal hydride, the graphene-loaded transition metal hydride catalyst It can significantly improve the hydrogen absorption and desorption behavior of hydrogen storage materials, reduce the working temperature of hydrogen absorption and desorption, improve cycle performance, and easily remove by-products during the reaction process, while ensuring that transition metal hydrides will not be oxidized.

The invention discloses an amorphous magnesium-aluminum-base composite hydrogen storage material and a preparation method thereof. The amorphous magnesium-aluminum-base composite hydrogen storage material is prepared from an amorphous Mg17Al12 matrix and a transition metal hydride in a mass ratio of 100:(0.5-10), wherein the transition metal hydride is one or more of TiH2, ZrH2 and ScH2. The preparation method comprises the following steps: a) in an inert atmosphere, uniformly mixing raw materials Mg powder and Al powder according to the proportioning of the Mg17Al12, and preparing amorphous Mg17Al12 matrix powder by low-temperature ball milling; and b) carrying out mechanical ball milling on the prepared amorphous Mg17Al12 matrix powder and transition metal hydride powder under the protection of the inert gas to obtain the amorphous magnesium-aluminum-base composite hydrogen storage material. The composite hydrogen storage material has excellent medium / low-temperature hydrogen absorption / desorption properties.

The invention discloses a preparation method of a binary and ternary transition metal hydride catalyst and its application in electrocatalytic hydrogen evolution and fuel cells. The molecular formula of the catalyst is Pt / H x m a R b Y c o 3 , where M, R, Y are three different transition metals, x value is 0.01~1, 0≤a<1, 0≤b<1, 0≤c<1, a+b+c=1, in the catalyst The mass content of Pt is 0.01%-20%. Pt / H for this application x m a R b Y c o 3 As a catalyst for electrolysis of water, its electrochemical performance in acidic electrolytes is comparable to that of commercial carbon-supported platinum catalysts, and the Pt / H x m a R b Y c o 3 It has extremely high stability, and the preparation process is simple and easy to scale up. Therefore, it can be used as a substitute for carbon-supported platinum catalysts to effectively reduce the cost of hydrogen production. Such bifunctional catalysts with electrocatalytic hydrogen evolution and oxygen reduction reactions have never been reported.

The invention discloses a preparation process of transition metal carbide powder and transition metal carbide-nitride composite powder. The present invention uses a ball milling method to mix a transition metal with a certain amount of organic solvent containing carbon or carbon and nitrogen at the same time. After ball milling for a certain period of time, transition metal carbides or transition metal carbides with an average grain size of less than 50nm are obtained. The nitride composite powder contains a certain amount of transition metal hydride nano powder. The prepared powder is heat-treated under vacuum (<1Pa) or argon environment to obtain transition metal carbide or carbide-nitride composite powder, and the transition metal grain size distribution of 50-900nm is prepared by controlling the heating rate and heat treatment time. For metal carbide powders and transition metal carbide-nitride composite powders, the carbon and nitrogen contents varied with the ball milling time and the amount of organic solvent. The invention has simple process and is easy to produce, and can be used for preparing high-performance metal ceramics.