1655 results about "Metallic catalyst" patented technology

Compounds and method of preparation of Si—X and Ge—X compounds (X═N, P, As and Sb) via dehydrogenative coupling between the corresponding unsubstituted silanes and amines (including ammonia) or phosphines catalyzed by metallic catalysts is described. This new approach is based on the catalytic dehydrogenative coupling of a Si—H and a X—H moiety to form a Si—X containing compound and hydrogen gas (X═N, P, As and Sb). The process can be catalyzed by transition metal heterogenous catalysts such as Ru(0) on carbon, Pd(0) on MgO) as well as transition metal organometallic complexes that act as homogeneous catalysts. The —Si—X products produced by dehydrogenative coupling are inherently halogen free. Said compounds can be useful for the deposition of thin films by chemical vapor deposition or atomic layer deposition of Si-containing films.

A polycrystalline diamond compact useful for wear, cutting, drilling, drawing and like applications is provided with a first diamond region remote from the working surface which has a metallic catalyzing material and a second diamond region adjacent to or including the working surface containing a non-metallic catalyst and the method of making such a compact is provided. This compact is particularly useful in high temperature operations, such as hard rock drilling because of the improved thermal stability at the working surface.

The present invention discloses nanowires for use in a fuel cell comprising a metal catalyst deposited on a surface of the nanowires. A membrane electrode assembly for a fuel cell is disclosed which generally comprises a proton exchange membrane, an anode electrode, and a cathode electrode, wherein at least one or more of the anode electrode and cathode electrode comprise an interconnected network of the catalyst supported nanowires. Methods are also disclosed for preparing a membrane electrode assembly and fuel cell based upon an interconnected network of nanowires.

The present invention discloses nanowires for use in a fuel cell comprising a metal catalyst deposited on a surface of the nanowires. A membrane electrode assembly for a fuel cell is disclosed which generally comprises a proton exchange membrane, an anode electrode, and a cathode electrode, wherein at least one or more of the anode electrode and cathode electrode comprise an interconnected network of the catalyst supported nanowires. Methods are also disclosed for preparing a membrane electrode assembly and fuel cell based upon an interconnected network of nanowires.

Disclosed are oxygen-scavenging polymer compositions having high transparency and low haze comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, a copolyamide or a transamidized, homogeneous blend of a least two polyamides, and a metal catalyst. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties.

A method of making a light emitting device is disclosed. The method includes providing a light emitting diode and forming an encapsulant in contact with the light emitting diode; wherein forming the encapsulant includes contacting the light emitting diode with a photopolymerizable composition consisting of a silicon-containing resin and a metal-containing catalyst, wherein the silicon-containing resin consists of silicon-bonded hydrogen and aliphatic unsaturation, and applying actinic radiation having a wavelength of 700 nm or less to initiate hydrosilylation within the silicon-containing resin.

A semiconductor device is provided which is produced from a high-quality and large-area graphene substrate and is capable of fully exhibiting superior electronic properties that graphene inherently has. The semiconductor device is capable of realizing increased operation speed, reduced power consumption, and higher degree of integration, and thus is capable of improving the reliability and productivity. Electrical short circuit between a graphene layer (4) and a metal catalyst layer for growth of graphene is prevented by causing the metal catalyst layer to be absorbed as a compound / alloyed layer 5 at the interface between a substrate (1) and an oxide layer (2).

Thermal interfaces and methods include an array of carbon nanotubes aligned substantively perpendicularly from a substrate. One method includes arranging metal catalyst particles with a particular ligand on a fluid surface of a Langmuir-Blodgett trough. This forms uniformly spaced particles with spacing based on the particular ligand. The uniformly spaced metal catalyst particles are deposited on a substrate and carbon nanotubes are grown on the particles using chemical vapor deposition. A highly efficient thermal interface can be produced with a carbon nanotube packing ratio greater than fifty percent and used in a thermal switch or other device. In some methods, commercially available nanotubes are condensed on a substrate using carbon nanotubes with terminal carboxylic acids in solution and an amine monolayer on the substrate. Pretreatment of the nanotubes in a switch by applying heavy pressure between two surfaces results in good thermal conductivity between those surfaces at smaller operating pressures.

A method for producing a carbon nanotube composite, in which carbon nanotubes are grown on a support substrate and metal catalyst. The carbon nanotubes, support substrate, and catalyst are combined in at least a partially unpurified form with a matrix material.

Disclosed is a process for the preparation of shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles, having high transparency and low haze, and comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce shaped articles having oxygen-scavenging properties.

A potting composition comprising (A) an organopolysiloxane having a vinyl group at an end of its molecular chain, (B) an organohydrogenpolysiloxane, (C) a platinum group metal catalyst, and optionally, (D) an organosilicon compound having a silicon atom-bonded alkoxy group. The cured product of the composition has a refractive index of 1.41-1.56 at 25° C. and 589 nm (sodium D line). The composition is suited for the embedment and protection of light-emitting semiconductor members. A package in which a light-emitting semiconductor member is embedded and protected with the potting composition undergoes little discoloration and maintains a high emission efficiency in heating tests, thus offering a light-emitting semiconductor device featuring a long life and energy saving.

Disclosed are polymer compositions having high transparency and low haze comprising immiscible blends of one or more thermoplastic polymers selected from polyesters, polycarbonates, and polyarylates, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce oxygen-scavenging compositions.

Disclosed are polymer compositions having high transparency and low haze comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce oxygen-scavenging compositions.

Disclosed are transparent, multilayered articles having high transparency and low haze and a process for their preparation. The multilayer articles comprise at least one layer which contains at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a separate layer which contains copolyamide or homogeneous blend of polyamides. The polyester component and the polyamide component have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into one or more of the layers of the article while maintaining high clarity. These articles can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into one or more layers to impart oxygen-scavenging properties.

A new method for preparing a supported catalyst is herein provided. Carbon nanotubes are functionalized by contacting them with an oxidizing agent to form functionalized carbon nanotubes. A metal catalyst is then loaded or deposited onto the functionalized carbon nanotubes. The mixture is then extruded to form the supported catalyst comprising a carbon nanotube structure containing metal catalyst more evenly dispersed within the internal structure of the carbon nanotube structure.

Disclosed are oxygen-scavenging polymer compositions having high transparency and low haze comprising immiscible blends of one or more thermoplastic polymers selected from polyesters, polycarbonates, and polyarylates, a copolyamide or a transamidized, homogeneous blend of a least two polyamides, and a metal catalyst. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties.

A hdyrocatalyst for removing metals from residual oil is composed of a macroreticular aluminium carrier and the Mo and / or W and Co and / or Ni, which are carried by said carrier. It features that said carrier contains aluminium oxide (95-99 wt%) and halogen (1-5) and has lower acidity, resulting in high demetallizing activity and low carbon deposit.

Provided are aligned carbon nanotubes for a fuel cell having a large surface area, a nanocomposite that includes the aligned carbon nanotubes loaded with highly dispersed nanoparticles of a metallic catalyst, methods of producing the carbon nanotubes and the nanocomposite, and a fuel cell including the nanocomposite. In the nanocomposite, nanoparticles of the metallic catalyst are uniformly distributed on external walls of the nanotubes. A fuel cell including the nanocomposite exhibits better performance.

Disclosed are a reactor and a corresponding method for producing electrical energy using a fuel cell by selectively oxidizing CO at room temperature using polyoxometalate compounds and transition metal compounds over metal-containing catalysts, thereby eliminating the water-gas shift reaction and the need to transport and vaporize liquid water in the production of H2 for fuel cells. The reactor also functions to deplete CO from an incoming gas stream.

A method for manufacturing carbon nanotubes with an integrally attached outer graphitic layer is disclosed. The graphitic layer improves the ability to handle and manipulate the nanometer size nanotube device in various applications, such as a probe tip in scanning probe microscopes and optical microscopes, or as an electron emitting device. A thermal chemical vapor deposition reactor is the preferred reaction vessel in which a transition metal catalyst with an inert gas, hydrogen gas and a carbon-containing gas mixture are heated at various temperatures in a range between 500° C. and 1000° C. with gases and temperatures being adjusted periodically during the reaction times required to grow the nanotube core and subsequently grow the desired outer graphitic layer.

Novel metal complexes, particularly chromium complexes, which contain at least one tridentate ligand are disclosed and prepared. Olefins, particularly ethylene, can be reacted to form butene and / or other homo- or co-oligomers and / or polymers with high α-olefin concentrations by contacting a metal catalyst which contains a transition metal, particularly chromium, complexes having per metal atom at least one tridentate ligand with N, O, or N and O coordinating sites.

A catalyst precursor composition and methods for making such catalyst precursor is disclosed. In one embodiment, the catalyst precursor is of the general formula Av[(MP)(OH)x(L)ny]z(MVIBO4), wherein MP is selected from Group VIII, Group IIB, Group IIA, Group IVA and combinations thereof; L is one or more oxygen-containing ligands, and L has a neutral or negative charge n<=0, MVIB is at least a Group VIB metal having an oxidation state of +6; MP:MVIB has an atomic ratio between 100:1 and 1:100; v−2+P*z−x*z+n*y*z=0; and 0≦y≦−P / n; 0≦x≦P; 0≦v≦2; 0≦z. In one embodiment, the catalyst precursor further comprises a cellulose-containing material. In another embodiment, the catalyst precursor further comprises at least a diluent (binder). In one embodiment, the diluent is a magnesium aluminosilicate clay.

A carbon nanosphere has at least one opening. The carbon nanosphere is obtained by preparing a carbon nanosphere and treating it with an acid to form the opening. The carbon nanosphere with at least one opening has higher utilization of a surface area and electrical conductivity and lower mass transfer resistance than a conventional carbon nanotube, thus allowing for higher current density and cell voltage with a smaller amount of metal catalyst per unit area of a fuel cell electrode.

Methods for preparing carbon nanotube layers are disclosed herein. Carbon nanotube layers may be films, ribbons, and sheets. The methods comprise preparing an aligned carbon nanotube array and compressing the array with a roller to create a carbon nanotube layer. Another method disclosed herein comprises preparing a carbon nanotube layer from an aligned carbon nanotube array grown on a grouping of lines of metallic catalyst. A composite material comprising at least one carbon nanotube layer and prepared by the process comprising a) compressing an aligned single-wall carbon nanotube array with a roller, and b) transferring the carbon nanotube layer to a polymer is also disclosed.

A process of forming silicon-based nanowires heats high-surface-oxygen-content silicon powders to initiate vapor-solid reaction to form nanowires. The reaction gas is charged to react with the Si powders to form the silicon-based nanowires such as silicon nanowires or SiC nanowires. With control of the reaction gas, the components of the nanowires can be exactly controlled without the addition of metallic catalysts. Thereby, the nanowires can be made with reduced cost.

Supported metallic catalysts comprised of a Group VIII metal, a Group VIB metal, and an organic additive, and methods for synthesizing supported metallic catalysts are provided. The catalysts are prepared by a method wherein precursors of both metals are mixed and interacted with at least one organic additive, dried, calcined, and sulfided. The catalysts are used for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.

The invention discloses an egg- shell metallic catalyst and the method for preparation and the application. The catalyst is an egg- shell supported metallic catalyst with a carrier of hollow silica dioxide, which is a hollow material of certain wall and bore diameter, and comprises a noble metal of 0.1%- 5.0% and / or a transient metal of 5.0%- 40.0%, a non- noble metallic catalyst promoter of 0- 0.5% and a hollow silica dioxide carrier of 60.0%- 99.0%, with the weight ratio of catalyst as a datum level. The egg- shell metallic catalyst can prepare with immersion method or in- situ supporting method. The catalyst has good metal dispersibility, and the metal particle diameter is minor, dispersing on the external surface, inner surface and in the pore passage. And the egg- shell metallic catalyst can catalyze CO and CO2 to prepare lower carbon number hydrocarbons and alcohol, and it also can catalyze olefin and alkyne selectively.

The invention provides a preparation method of graphene. The method comprises the following steps: (A) pretreating biologic materials to obtain the pretreated biologic materials, wherein the biologic materials comprise one or several kinds of forestry and agricultural residues, tea leaves and seaweed plants; (B) mixing metal catalysts, solvents and the biologic materials pretreated in the step (A) to obtain the biologic materials loaded with the catalysts; (C) mixing pore forming agents and the biologic materials which are obtained in the step (B) and loaded with the catalysts, and heating for 0.5 to 10 hours under the temperature of 700-1200 DEG C to obtain the graphene. The preparation method for the graphene, provided by the invention, has no pollution to environment, the biologic materials are used as carbon sources, the cost of the raw materials of the carbon sources is low, and the raw materials are easy to obtain, so that the problems that the cost of existing carbon sources is high, and existing carbon sources are not beneficial to the large-scale industrialization are solved.

The invention relates to the field of catalysts, and discloses a catalyst carrier, a preparation method thereof and a hydrodemetalation catalyst containing the catalyst carrier. The catalyst carrier is formed by stacking a plurality of nanorod-shaped aluminum oxide monomers and is provided with open ducts. Each nanorod-shaped aluminum oxide monomer has the length of 100-500 nm and the diameter of 10-50 nm. The catalyst carrier has large pore volume and pore aperture and has good pore properties, permeability and metal capacity. The catalyst carrier is simple in preparation method, free of addition of pore forming materials, plasticizer and other various additives, and low in cost; in addition, the hydrodemetalation catalyst is high in metal capacity and high in activity and stability.