229 results about "Transition metal atoms" patented technology

Polymer blends are disclosed that comprise one or more unsaturated olefinic homopolymers or copolymers having at least one functionality capable of entering into condensation reactions; one or more polyamide homopolymers or copolymers; one or more polyethylene terephthalate homopolymers or copolymers obtained using a catalyst system comprising antimony atoms; and one or more transition metal atoms. The inventive blends are useful for packaging, and exhibit improved oxygen-scavenging activity and lower haze compared with blends made using polyethylene terephthalate polymers prepared with antimony catalyst and either the olefinic or the polyamide homopolymers or copolymers, individually.

A method of using a metal complex as an n-dopant for doping an organic semiconducting matrix material in order to alter the latter's electrical characteristics is provided. In order to provide n-doped organic semiconductors with matrix materials having a low reduction potential, while achieving high conductivities, the n-dopant is a neutral electron-rich metal complex with a neutral or charged transition metal atom as a central atom and having at least 16 valence electrons. The complex can be polynuclear and can possess at least one metal-metal bond. At least one ligand can form a π complex with the central atom, which can be a bridge ligand, or it can contain at least one carbanion-carbon atom or a divalent atom. Methods for providing the novel n-dopants are provided.

A semiconductor structure and method of forming the same, comprising forming a uniform buffer layer of diffusion-controlling stable material on top of a base gate dielectric layer, and then forming a uniform layer which contains a source of transitional metal atoms, and then annealing the structure to diffuse the transitional metal atoms from their source through the diffusion-controlling material and into the base gate dielectric layer.

The present invention provides an olefin polymer having a narrow molecular weight distribution and a specific molecular weight, an olefin polymer having a functional group introduced at the terminal, a tapered polymer containing a segment wherein monomer composition continuously changes in the polymer chain, an olefin polymer having different segments which are bonded to each other, and a process for preparing these polymers. The olefin polymers of the invention are polymers of olefins of 2 to 20 carbon atoms and have a number-average molecular weight of not less than 500 and Mw/Mn of not more than 1.5. In the process for preparing an olefin polymer, an olefin of 2 to 20 carbon atoms is polymerized in the presence of an olefin polymerization catalyst comprising a transition metal compound represented by, for example, the following formula (I):

L_mMX_n  (I)

wherein M is a transition metal atom of Group 3 to Group 11 of the periodic table, m is 1 to 5, n is a number satisfying a valence of M, L is a ligand coordinated to the central metal M and is a ligand containing a heteroatom having no direct bond to the central metal, and X is a halogen atom, a hydrocarbon group or the like.

An electrocatalyst based on a highly electroconducting polymer and a transition metal, in which transition metal atoms are covalently bonded to heteroatoms of the backbone monomers of the polymer. The covalently bonded transition metal atoms are nucleation sites for catalytically active transition metal particles. The complex is prepared by complexing a highly electroconducting polymer with transition metal coordination ions and then reducing the transition metal ions to neutral atoms. An electrode for a fuel cell is made by impregnating an electrically conducting sheet with the catalytic complex and drying the impregnated sheet. The scope of the present invention includes such electrodes and the fuel cells that incorporate these electrodes.

The invention discloses a method for preparing a lithium battery anode material lithium transition metal composite oxide, which comprises the following steps of: uniformly mixing transition metal mixed M salt and metal doped M' salt in accordance with a stoichiometric proportion in a mechanical mode; calcining at high temperature to form the transition metal composite oxide; performing secondary mechanical mixing on the transition metal composite oxide and the lithium salt; and calcining at high temperature to prepare the lithium transition metal composite oxide. By adopting a secondary mechanical mixing-solid-phase sintering process, the method solves the problems that a pure-phase quaternary lithium transition metal composite oxide cannot be synthesized by the traditional dry mixing solid-phase sintering process, and the improved wet mixing-solid-phase sintering method cannot make lithium and transition metal atoms uniformly and sequentially arranged; the lithium battery anode material lithium transition metal composite oxide has the advantages of no impurity phase, and uniform average grain diameter and excellent cycle performance of the product; and the preparation method has the advantages of simpleness, low production cost and suitability for industrial production.

The invention discloses a quaternary sulfide semiconductor material, and a preparation method and application thereof. An alkali metal compound, metallic copper, binary solid solution solid solution and elemental sulfur are used as raw materials, hydrazine hydrate and polyethylene glycol are used as solvents, and a reaction is carried out in a baking oven with a temperature of 120 to 190 DEG C for 4 to 9 d so as to prepare the quaternary sulfide semiconductor material. The chemical composition of the quaternary sulfide semiconductor material is A<x>Cu<y>Sb<z>S<x+y+3z>/2, wherein A is alkali metal atoms of a balanced anion skeleton, x represents the molar weight of the alkali metal atoms, y is the molar weight of transition metal atoms composing the skeleton and z is the molar weight of atoms composing the skeleton. The preparation method has the advantages of simple operation process, low cost of raw materials, mild reaction conditions, low synthesis temperatures, etc. Quaternary sulfide prepared by using the method has yield of 60 to 90%, a crystal grain size of 150 to 300 [mu]m and high chemical purity and can be used for preparing optical semiconductor devices.

A semiconductor device and a fabrication method of the semiconductor device, the semiconductor device including: a substrate; a nitride based compound semiconductor layer placed on the substrate and doped with a first transition metal atom; an aluminum gallium nitride layer (Al_xGa_1-xN) (where 0.1<=x<=1) placed on the nitride based compound semiconductor layer; a nitride based compound semiconductor layer placed on the aluminum gallium nitride layer (Al_xGa_1-xN) (where 0.1<=x<=1) and doped with a second transition metal atom; an aluminum gallium nitride layer (Al_yGa_1-yN) (where 0.1<=y<=1) placed on the nitride based compound semiconductor layer doped with the second transition metal atom; and a gate electrode, a source electrode, and a drain electrode which are placed on the aluminum gallium nitride layer (Al_yGa_1-yN) (where 0.1<=y<=1). Accordingly, piezo charge is inactivated, leakage current and current collapse are reduced, high frequency characteristics can be improved by obtaining a high resistivity semiconductor layer, and stable high frequency performance can be obtained.

The present disclosure is directed to new photoluminescent metal-organic frameworks (MOFs). The newly developed MOFs include either non rare earth element (REE) transition metal atoms or limited concentrations of REE atoms, including: Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Ru, Ag, Cd, Sn, Sb, Ir, Pb, Bi, that are located in the MOF framework in site isolated locations, and have emission colors ranging from white to red, depending on the metal concentration levels and/or choice of ligand.

A Pd/C catalyst for preparing alcohol ether carboxylate consists of the following components by weight percentages: 1-10% of palladium, 1-10% of alkaline earth metals, 1-10% of transition metals and 70-97% of active carbon. The Pd/C catalyst has the advantages that alkaline earth metal atoms and transition metal atoms are added to a palladium carbon catalyst, the used amount of the precious metal palladium is reduced, the catalyst property is improved, the catalytic activity is good and selectivity is high, and the catalyst can increase the yield of the alcohol ether carboxylate by 10-20%.

This invention relates to a transition metal compound represented by the formula:

wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; E is: 1) a substituted or unsubstituted indenyl ligand that is bonded to Y through the four, five, six or seven position of the indenyl ring, or 2) a substituted or unsubstituted heteroindenyl ligand that is bonded to Y through the four, five or six position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom, or 3) a substituted or unsubstituted fluorenyl ligand that is bonded to Y through the one, two, three, four, five, six, seven or eight position of the fluorenyl ring, or 4) a substituted or unsubstituted heterofluorenyl ligand that is bonded to Y through the one, two, three, four, five or six position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom; A is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted fluorenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or other mono-anionic ligand; Y is a Group 15 or 16 bridging heteroatom substituent that is bonded via the heteroatom to E and A; and X are, independently, univalent anionic ligands, or both X are joined and bound to the metal atom to form a metallocycle ring, or both X join to form a chelating ligand, a diene ligand, or an alkylidene ligand. This invention further relates to catalyst systems comprising the above transiotioon metal compounds, activators and optional supports and their use to polymerize or oligomerize olefins.

The invention provides the alkene polymerization catalyst which possesses high polymerization activity and the method of preparing alkene polar monomer copolymer by using the said catalyst. The catalyst comprises (A) and (B). The (A) comprises transition metal compound whose general formula is (I), and the (B) comprises the metal organic compound or organic aluminoxane compound or ionized ionic compound. In the transition metal compound of general formula (I), the M is at the ó¾B or ó¶B in the periodic table of elements, m is a integer between 1 and 3, R1 is alkene, R2 - R5 are H, halogen, hydrocarbon radical and so on, R6 is halogen or hydrocarbon radical and so on, and X is halogen or hydrocarbon radical and so on. The alkene used in combined polymerization comprises the all alkene which can coordinate and polymerize, the polar monomer comprises the ª‡-alkene polar monomer which can coordinate and polymerize and includes NíóOíóPíóSíóBíóSi, halogen and so on.

Polymer blends are disclosed that comprise one or more polybutadiene homopolymers or copolymers having at least one functionality capable of entering into condensation reactions; one or more polyethylene terephthalate homopolymers or copolymers obtained using a catalyst system comprising aluminum atoms and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues, optionally obtained by a melt-phase polymerization process; and one or more transition metal atoms. The blends are useful for packaging, and exhibit improved oxygen-scavenging activity compared with blends made using many conventional polyethylene terephthalate polymers prepared with conventional catalyst systems.

A process for preparing the catalyst containing the S and the atom cluster compound of transition metal (Mo or W) and used for hydrodesulfurizing is disclosed. Said atom cluster compound of Mo or W is prepared from its oxide through electrolyzing in acid solution, sulfurizing, oxidizing, concentrating, separation and chemical reaction. Its advantage is high hydrodesulfurizing performance.

The invention discloses a nitrogen-doped graphdiyne riveted transition metal monatomic catalyst as well as a preparation method and application thereof. According to the catalyst, nitrogen atoms are doped in a novel carbon material graphdiyne carrier, transition metal single atoms are riveted on the surface of nitrogen-doped graphdiyne through the covalent effect between the transition metal single atoms and N and C atoms, and thus transition metal is uniformly dispersed on the surface of the nitrogen-doped graphdiyne in a single atom form to form the catalyst. Transition metal atoms in the catalyst are uniformly dispersed on the surface of the nitrogen-graphdiyne-based catalyst in a single atom state, a large number of active sites are provided for oxidation-reduction reaction, graphdiyneis adopted as a carbon substrate and has excellent morphological characteristics, formation of catalytic active sites is facilitated, and catalytic advantages of single atoms are brought into play. The catalyst disclosed by the invention has high electrocatalytic activity on oxygen reduction under an alkaline condition, is simple and effective in preparation process, low in cost and easy to popularize and put into production, and has important significance in the field of fuel cell development and application.

Described herein are methods comprising contacting one or more olefins with a catalyst system in a polymerization reactor at conditions sufficient to produce a polyolefin, wherein the catalyst system comprises a first metallocene catalyst compound comprising a first transition metal atom, two cyclopentadienyl ligands bound to the first transition metal atom, and two leaving groups bound to the first transition metal atom, wherein at least one leaving group is selected from the group consisting of a halo-phenoxy and a halo-alkoxy; wherein the first metallocene catalyst compound has a catalyst productivity that is at least 20% greater than a comparative metallocene catalyst compound used to produce the same polyolefin, wherein the comparative metallocene catalyst compound is the same as the first metallocene catalyst compound except neither leaving group is a halo-phenoxy or a halo-alkoxy.

The invention belongs to the technical field of the immobilization of metalloporphyrin on a carrier, and in particular relates to a method for immobilizing metalloporphyrin by crosslinked polystyrene microspheres, which solves the problems of low immobilized amount, complex process and inconvenient operation in the conventional method for immobilizing the metalloporphyrin. The method comprises the following steps of: adding chloromethylated crosslinked polystyrene microspheres into dimethyl sulfoxide, adding NaHCO3 and KI for reaction, and drying to obtain AL-CPS; swelling the AL-CPS in a solvent, adding benzaldehyde and a catalyst, raising the temperature, dripping the solvent dissolved with pyrrole for reaction, and drying to obtain crosslinked polystyrene microspheres immobilized with porphyrin; adding the crosslinked polystyrene microspheres immobilized with the porphyrin into N,N-dimethylformamide, adding metal salts or oxides formed by transition metal atoms or lanthanide series metal atoms for reaction, and drying to obtain the crosslinked polystyrene microspheres immobilized with metalloporphyrin. The method is novel and quick; and the prepared material has high stability and can be repeatedly used.

A nonaqueous electrolyte solution for a secondary battery, including an electrolyte, a solvent and an additive, and a nonaqueous electrolyte secondary battery including the nonaqueous electrolyte solution. The additive contains a compound represented by the following formula (I):

wherein n represents an integer of 1 to 4, in the case of n=1, R¹ represents a halogen atom or the like, in the case of n=2, R¹ represents an alkaline earth metal atom or the like, in the case of n=3, R¹ represents a trivalent transition metal atom or the like, in the case of n=4, R¹ represents a tetravalent transition metal atom or the like, and R² represents an alkylene group of 1 to 6 carbon atoms or an alkenylene group of 2 to 6 carbon atoms.

The invention discloses a preparation method for precious metal and transition metal nanowires and a nano reticular material, and belongs to the field of nanomaterial preparation. The preparation method comprises the following steps that firstly, a Cu-Zr-Al-Ag non-crystal alloy thin belt is prepared by adopting a solution fast quenching method; then a suitable corrosive liquid is selected, chemical de-alloying processing is conducted, Zr and Al elements are removed, and a nanoporous copper silver composite material is obtained; after the end of the corrosion process, the nanoporous copper silver composite material is washed repeatedly through distilled water and absolute ethyl alcohol, after the nanoporous copper silver composite material is dried by air, precious metal or transition metal atom clusters are sputtered onto the surface of the nanoporous copper silver composite material through ion sputtering equipment, the precious metal or transition metal nanowires grow out, the diameter of the nanowires is 10-100 nm, and the nanowires grow continuously in a staggered mode to form the nano reticular material. The preparation method is simple and convenient in technology, economical and controllable in process, a prepared precious metal nanonet shows the good performance such as surface enhanced raman scattering (SERS), the broad application prospects in optics, electricity, catalysis, biology and other areas are achieved.

A pyridine type metal complex having a partial structure represented by the formula (I) or (I′):

wherein,

M is a transition metal atom; Ds, which may be the same or different, respectively represent specific conjugated chains; Rs, which may be the same or different, respectively represent a halogen atom, a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an alkenyl or alkynyl group having 2 to 10 carbon atoms, an aryl or heteroaryl group having 6 to 10 carbon atoms or an arylalkyl or heteroarylalkyl group having 7 to 13 carbon atoms which may have a substituent group.