26 results about "Transition metal" patented technology

The invention relates to the technical field of photocatalytic materials, and relates to a preparation method and an application of bimetallic photocatalytic functional POM/MOFs. Bimetallic photocatalytic functional POM/MOF target materials with a porous structure are prepared through a hydrothermal synthesis technology or a layered diffusion technology with polyoxometalate POM as a functional group, L as a connection ligand and Cu<2+>, Co<2+> or Fe<2+> in a transition metal salt Tm as nodes, and the target materials POM/MOFs are applied in a functional photocatalytic carbon- carbon coupling reaction. The preparation method has the advantages of simple synthetic steps, easy operation, low energy consumption and high yield, and the obtained functional materials have the advantages of stable chemical properties, and easy large-area popularization and application. The MOF photocatalytic materials have a large specific surface area, have a very good conversion rate and reusability under the irritation of a 18W energy saving lamp when the use amount is 6/1000 of the amount of a substrate, and are suitable for the needs of large-scale industrial production.

An electrode comprises a conductor and an electrode coating, said electrode coating comprising as electronically active material a transition metal (T) oxidenitride of formula Li_xT^I_mT^II_nN_yO_z form of nanoparticles, wherein x=0-3, y+z=2-4, y>0, z>=0.25, m+n=1, m=0-1, n=0-1, T^I and T^II both being transition metals of the groups IVB, VB, VIB and VIIB, and periods 3d, 4d and 5d, in particular transition metals selected from Zr, Nb, Mo, Ti, V, Cr, W, Mn, Ni, Co, Fe and Cu. Dependent on the kind of transition metal, its oxidation state and the Li content, such materials may be used as anode materials or as cathode materials, respectively.

The invention discloses a high water-solubility ruthenium metal complex singlet oxygen fluorescent probe, a preparation method thereof, and an application thereof. According to the invention, a transition metal ruthenium is adopted as a central ion of the ruthenium complex; and anthracene nucleus derivatives with sodium (or potassium) sulfonate groups are adopted as ligands. The ruthenium complex has properties of a singlet oxygen fluorescent probe and a better water-solubility than existing anthracene nucleus derivative ligand ruthenium complexes. The ruthenium complex is suitable for quantitative or qualitative determinations of <1>O2 in neutral or basic system solutions.

The invention discloses a lithium air battery catalyst based on metal organic frameworks (MOFs), and a method for preparing the lithium air battery catalyst. The catalyst consists of a transition metal complex and MOFs carriers, wherein the transition metal complex is obtained by reacting cobalt salt or manganese salt with a nitrogen-containing ligand. After being applied to a lithium air battery, the catalyst is high in catalytic activity and high in stability. By using the low-cost nitrogen-containing ligand as a raw material, the catalyst has the advantages of simple preparation process, low preparation cost and the like.

The invention relates to a layered lithium-rich manganese oxide positive electrode material suppressing capacity/voltage attenuation during a circulation process effectively and a preparation method therefor and an application thereof. The preparation method of the layered lithium-rich manganese oxide positive electrode material comprises the following steps of: during a preparation process of a precursor of the layered lithium-rich manganese oxide positive electrode material of a lithium ion battery, adding the raw material precursor of LiNiO2; and performing high temperature heat treatment to obtain a layered lithium-rich manganese oxide composite positive electrode material. The Ni element in the layered lithium-rich manganese oxide positive electrode material can effectively suppress the migration of transitional metal elements during the circulation of the layered lithium-rich manganese positive electrode material and suppress the formation of a spinel phase, thereby effectively suppressing the capacity/voltage attenuation during the circulation process. The positive electrode and the lithium ion battery that use the material belong to the technical field of energy materials and energy conversion. The material used as the positive electrode material of the lithium ion battery has the advantages of high energy density, cycling stability, and good rate capability.

The invention discloses a method for synthesizing primary alcohol, which utilizes transition metal catalysis and uses isopropanol as a hydrogen source to synthesize the primary alcohol. The reaction not only uses inexpensive and environmentally friendly isopropanol as the hydrogen source and a solvent, but also has the advantages of high yield, environmental protection, and the like, and thereforethe reaction has broad development prospects.

The invention relates to a preparation method and application of a wafer-level absolute single-layer transition metal chalcogenide. The preparation method comprises the following steps that (1) first annealing treatment is carried out on a sapphire substrate to obtain a sapphire substrate with an atomic-scale flat surface; (2) a transition metal salt solution is loaded on the atomic-scale flat surface of the sapphire substrate obtained in the step (1), and secondary annealing treatment is carried out to obtain a sapphire substrate loaded with a monodisperse transition metal source; and (3) the transition metal chalcogenide is grown on the sapphire substrate loaded with the monodisperse transition metal source through a chemical vapor deposition method. A two-dimensional material prepared by the method is an absolute single layer, batch preparation on wafer-level (two inches, four inches, eight inches and twelve inches) sapphire substrates can be realized, the crystal quality is high, the single crystal size is large, the operation is simple, the cost is low, and industrialization is easy.

The invention discloses a preparation method of a sodium ion transition metal oxide positive electrode material, which comprises the following steps: S1, mixing: taking out stoichiometric sodium acetate trihydrate, manganese acetate tetrahydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate, magnesium acetate, zinc acetate dihydrate and citric acid, and conducting uniform dissolving inquantitative water, then fully conducting stirring and dissolving, transferring the solution into a water bath kettle, and continuously conducting stirring to a gel state. According to a prepared sodium ion positive plate, the Zn element is doped in the sodium ion positive plate, so that the Jahn-Teller effect of Mn<3+> ions can be effectively weakened, and the structural stability of the positive electrode material in the circulation process is better improved, so that the cycle life of the prepared material and improving the rate capability of the prepared material is effectively prolonged,the Zn doping amount can be further increased, the cycling stability of the material can be continuously improved, the material has excellent cycling performance and rate capability in use, the positive electrode material can effectively promote the practical application of the sodium ion battery, and the practicability is relatively high.

The present invention provides a non-metallocene catalyst comprising a complex having one or more ligands coordinated a transition metal. The catalyst contains substituents bonded to the transition metal through a heteroatom such as oxygen or sulfur. Furthermore, the complex includes a Group 3 to 10 transition or lanthanide metal and one or more anionic or neutral ligands in an amount that satisfies the valency of the metal such that the complex has a net zero charge. The present invention also discloses a method for preparing the catalyst and polymerizing olefins utilizing the catalyst of the present invention.

The invention provides a three-dimensional bi-continuous porous-carbon-based transition metal porous material and a preparation method thereof. The porous material comprises porous carbon and a three-dimensional bi-continuous transition metal porous material. The preparation method comprises the following steps of pickling zinc powder to remove an oxide film, fine-grinding and screening through aball mill, washing and drying to obtain micron-millimeter-level zinc powder; mixing and grinding the zinc powder and the transition metal powder to obtain zinc-containing transition metal alloy powder, spreading a layer of porous carbon powder on the middle part of the zinc-containing transition metal alloy powder layer, and rolling by a hydraulic press under a room-temperature condition to obtainporous carbon intercalated transition metal/zinc alloy of a sheet layer; and putting the porous carbon intercalated transition metal/zinc alloy of the sheet layer in a vacuum heating system, and evaporating zinc by heating at the high temperature, thereby obtaining the three-dimensional bi-continuous porous-carbon-based transition metal porous material. The three-dimensional bi-continuous porous-carbon-based transition metal porous material adopts room-temperature rolling and vacuum heating to control hole diameters and distribution of holes, has a great specific surface area and high heat conductivity and electrical conductivity, and is wide in range of application.

The invention discloses a composite filter plant for a fresh air fan. The composite filter plant for the fresh air fan comprises a primary filter screen, an efficient air filter screen, an electrostatic dust removal filter screen and a photocatalyst filter screen. The electrostatic dust removal filter screen and the photocatalyst filter screen are arranged between the primary filter screen and the efficient air filter screen, the photocatalyst filter screen is a thin film filter screen, nanometer titanium dioxide and tolyltriazole are mixed with each other to manufacture the thin film filter screen, and transition metal complexes are coated on the surfaces of the photocatalyst filter screen; the electrostatic dust removal filter screen is made of polypropylene treated by electrostatic electrets. The composite filter plant for the fresh air fan has the advantages that sterilization effects can be realized by the photocatalyst filter screen without perpendicular incidence of ultraviolet light, dust removal effects of electric fields can be realized by the electrostatic dust removal filter screen without being powered on, and accordingly energy consumption can be reduced; the composite filter plant can be washed, and the filter screens are convenient to clean.

The invention belongs to the technical field of catalysts, and discloses a photocatalyst transition metal halide molten salt preparation method and application, a low-valence compound stable to air and water is used as a Ti source, transition metal halide is used as molten salt, the Ti source and the molten salt are mixed and ground according to a molar ratio, and a photocatalyst transition metal halide molten salt is obtained; and heating the transition metal halide in an air atmosphere until the temperature is not lower than the melting point of the molten salt, enabling the transition metal halide to be in a molten state, preserving heat, washing with water, and separating to obtain the reduction-state TiO2-x photocatalyst which is rich in Ti < 3 + > and Ov and has excellent visible light response capability. The obtained product has excellent visible light response performance, and the defects that multiple steps are needed for traditional defect-state titanium dioxide preparation, and flammable and explosive reducing gas or other dangerous reducing agents or oxidizing agents are used are overcome; and the adopted Ti source is stable to air and water, so that the defects of adopting an organic solvent and other easily-hydrolyzed Ti sources are completely avoided, and industrialization is facilitated.

The invention discloses a precious metal anti-cancer nano material and a preparation method and application thereof.The preparation method comprises the steps that a chloroauric acid aqueous solution, a chloroplatinic acid aqueous solution and a copper chloride aqueous solution are evenly mixed, an ascorbic acid aqueous solution is added, heating is conducted for 1-4 h at the temperature of 30-60 DEG C, a product is centrifugally washed, and the precious metal anti-cancer nano material is obtained. The precious metal anti-cancer nano material with the face-centered cubic structure can be obtained. According to the preparation method of the precious metal anti-cancer nano material, the problem that in the prior art, the preparation conditions for preparing the precious metal-transition metal alloy nano material are harsh and tedious is solved. And the reaction is carried out in a water phase without adding an organic solvent or a surfactant, so that the prepared precious metal anticancer nano material can be prevented from being polluted by reagents.

The present disclosure belongs to the technical field of sensors, relates to a graphene resonant gas sensor, and in particular, to a graphene resonant gas sensor based on doped metal atoms and a preparation process therefor. In the present disclosure, the metal atoms are embedded in a graphene resonant beam, and a transition metal layer may use the doped metal atoms as anchor points to be tightly adsorbed to the surface of the graphene resonant beam, so that the quality of surface contact between the transition metal layer and the graphene resonant beam is improved, and the problems such as low quality and low sensitivity of conventional resonant gas sensors are effectively solved.

The invention discloses a cobalt-based Fischer Tropsch synthesis catalyst; the catalyst contains 70%-95%, preferably 85% above by weight of a composite metal oxide, and a metal additive; the composite metal oxide shows a cubic crystal form and has a structure formula of ABO3-y, wherein A is an alkaline earth metal, B is transition metals at least comprising cobalt, the mole content of the cobalt in the transition metals is higher than 75%, preferably higher than 80% , y is the mole number of oxygen vacancies existing in the composite oxide. The catalyst can improve a diesel fraction proportion in a liquid hydrocarbon product and reduce methane selectivity.

The invention relates to a method for preparing a tetrahydrobenzo[b][1,8]naphthyridine derivative. Specifically, the invention provides the method for preparing the tetrahydrobenzo[b][1,8]naphthyridine derivative from an o-azidobenzaldehyde derivative and an aza 1,6-eneyne derivative under the catalysis of metal and acid. By adopting the method provided by the invention, a transition metal catalyst is used and the tetrahydrobenzo[b][1,8]naphthyridine derivative, which is difficult to obtain by other methods and has a multiplex-ring structure, is obtained by adopting simple and easy-to-obtain raw materials through simple operation steps.

An electronically active glass has the composition (T_xO_y)_z-(M_uO_v)_w—(Na/LiBO₂)_t wherein

• • T is a transition metal selected from V and Mo,
  • M is a metal selected from Ni, Co, Na, Al, Mn, Cr, Cu, Fe, Ti and mixtures thereof,
  • x, y, u, and v are the stoichiometric coefficients resulting in a neutral compound, i.e. x=2y/(oxidation state of T) and u=2v/(oxidation state of M),
  • z, w and t are weight-%, wherein
  • z is 70-80,
  • w is 0-20
  • t is 10-30, and
  • the sum of z, w and t is 100 weight-%, in particular V₂O₅—LiBO₂ and V₂O₅—NiO—LiBO₂.