688results about "Ruthenium/rhodium/palladium/osmium/iridium/platinum compounds" patented technology

An organometallic complex is provided by which favorable red-color light emission can be obtained. Further, an organometallic complex having a peak of light emission at about 620 nm is provided because the wavelength of light which is perceived as excellent red-color light is about 620 nm. Furthermore, an organometallic complex is provided by which red-color light emission with high luminous efficiency (cd/A) can be obtained. An organometallic complex represented by the following general formula (G2) and a light-emitting element, a light-emitting device, and an electronic device including the organometallic complex represented by the following general formula (G2) are provided.

Nanoparticle compositions of noble metals, and methods of making them, are described. The nanoparticle compositions are made by reacting a salt or complex of a noble metal, such as Au, Ag, Cu or Pt, with a weak ligand, and a reducing agent, in a single liquid phase. The noble metal is typically provided as a halide or carboxylate. The ligand is preferably a fatty acid or aliphatic amine. The reducing agent is preferably a borohydride reagent, hydrazine, or a mixture thereof. Nanocrystals in the size range of 1 nm to 20 nm are produced, and can be made in substantially monodisperse form.

A process for leaching a value metal from a base metal sulfide ore, comprising the step of leaching the ore with a lixiviant comprising a chloride, an oxidant and hydrochloric acid is disclosed. The leaching is controlled, by use of low concentrations of hydrochloric acid and a redox potential, to effect formation of hydrogen sulfide from the base metal sulfide ore. The hydrogen sulfide is stripped from the leach solution, thereby reducing the amount of sulfate generated in the leach to very low levels. The leaching may also be conducted to limit the co-dissolution of platinum group metals and gold with the base value metals. The leach forms a value metal-rich leachate and a solids residue. The solids residue may be subsequently leached to recover the platinum group metals and gold. The value metal-rich leachate can be is oxidized and neutralized to recover the value base metals. In an embodiment, the chloride is magnesium chloride and lixiviant solution is regenerated.

Intercalation compositions having spinel structures with crystallites of metal oxides (M2O3) dispersed throughout the structure are provided having the general formula Li1+xMyMn2-x-yO4. Methods of producing the intercalation compositions and rechargeable lithium batteries containing the compositions are also provided.

An excellent positive electrode material for a lithium secondary battery is provided that can increase low-temperature load characteristics of the battery as well as improving coatability. When measured by mercury intrusion porosimetry, the material meets Condition (A) and at least either Condition (B) or Condition (C).

Condition (A) : on a mercury intrusion curve, the mercury intrusion volume from 50 MPa to 150 MPa is 0.02 cm³/g or smaller.

Condition (B): on the mercury intrusion curve, the mercury intrusion volume from 50 MPa to 150 MPa is 0.01 cm³/g or larger. Condition (C): the average pore radius is within 10-100 nm, and the pore-size distribution curve has a main peak (with peak top at a pore radius of within 0.5-50 μm) and a sub peak (with peak top at a pore radius of within 80-300 nm).

This invention provides a method for preparing cerium oxide nanoparticles with a narrow size distribution. The cerium oxide nanoparticles obtained by the method of the invention are nearly all crystalline. The method comprises providing a first aqueous solution comprising cerium nitrate and providing a second aqueous solution comprising hexamethylenetetramine. The first and second aqueous solutions are mixed to form a mixture, and the mixture is maintained at a temperature no higher than about 320° K to form nanoparticles. The nanoparticles that are formed are then separated from the mixture. A further aspect of the present invention is an apparatus for preparing cerium oxide nanoparticles. The apparatus comprises a mixing vessel having a first compartment for holding a first aqueous solution comprising cerium nitrate and a second compartment for holding a second aqueous solution comprising hexamethylenetetramine. The mixing vessel has a retractable partition separating the first and second compartments. When the retractable partition is retracted, rapid mixing of the first aqueous solution with the second aqueous solution takes place to form a mixture, and the mixture is maintained at a temperature no higher than about 320° K to form nanoparticles therein.

Compounds are expressed by general formula of AxBC2-y where 0<=x<=2 and 0<=y<1, and have CdI2 analogous layer structures; A-site is occupied by at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Ir, Pt, Au, Sc, rare earth elements containing Y, B, Al, Ga, In, Tl, Sn, Pb and Bi; B-site is occupied by at least one element selected from the group consisting of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W, Ir, and Sn; C-site is occupied by at least one element selected from the group consisting of S, Se and Te; the compounds exhibit large figure of merit so as to be preferable for thermoelectric generator/refrigerator.

A multi-phase catalyst for the simultaneous conversion of oxides of nitrogen, carbon monoxide, and hydrocarbons is provided. A catalyst composition comprising the multi-phase catalyst and methods of making the catalyst composition are also provided. The multi-phase catalyst may be represented by the general formula of Ce_yLn_1-xA_x+sMO_Z, wherein Ln is a mixture of elements originally in the form of single-phase mixed lanthanides collected from natural ores, a single lanthanide, or a mixture of lanthanides; A is an element selected from a group consisting of Mg, Ca, Sr, Ba, Li, Na, K, Cs, Rb, or any combination thereof; and M is an element selected from the group consisting of Fe, Mn, Cr, Ni, Co, Cu, V, Zr, Pt, Pd, Rh, Ru, Ag, Au, Al, Ga, Mo, W, Ti, or any combination thereof; x is a number defined by 0≦x<1.0; y is a number defined by 0≦y<10; s is a number defined by 0≦s<10; where s=0 only when y>0 and y=0 only when s>0. The multi-phase catalyst can have an overlayer of an oxide having the fluorite structure with a combination of platinum and/or rhodium.

A novel nanocarbon composite structure is provided having trapped ruthenium oxide. By using Ketjen black, and through chemical-mechanical effect utilizing an ultracentrifugal reaction field, both the specific surface area of ruthenium oxide and space of electrode material are expanded to have nanoparticles of ruthenium oxide highly dispersed in a graphene layer. This nanocarbon composite structure having trapped ruthenium oxide exhibits high electrochemical activity and is suitable for use as an electrical energy storing device, such as a large-capacity capacitor.

This invention relates to the recovery of platinum group metals and, more particularly, to the recovery of platinum group metals from various sources by roasting the source material with one or more of sulfuric acid, a sulfate and/or a bi-sulfate and with one or more halogen salt. The roasted product is put in contact with a leaching solution to dissolve at least a portion of the platinum group metals, which then may be separated and recovered.

A general, reproducible, and simple synthetic method that employs readily available chemicals permits control of the size, shape, and size distribution of metal oxide nanocrystals. The synthesis entails reacting a metal fatty acid salt, the corresponding fatty acid, and a hydrocarbon solvent, with the reaction product being pyrolyzed to the metal oxide. Nearly monodisperse oxide nanocrystals of Fe₃O₄, Cr₂O₃, MnO, Co₃O₄, NiO, ZnO, SnO₂, and In₂O₃, in a large size range (3-50 nm), are described. Size and shape control of the nanocrystals is achieved by varying the reactivity and concentration of the precursors.

The present invention provides a precious metal—metal oxide composite cluster, wherein said cluster is formed as a single particle by combining a precious metal portion comprising a single atom or an aggregate of a plurality of atoms consisting of one or more precious metals, and a metal oxide portion comprising a single molecule or an aggregate of a plurality of molecules consisting of one or more metal oxides, and wherein said particle has a particle size between 1 and 100 nm.

Disclosed are a method for fabricating nanopowders, nano ink containing the nanopowders and micro rods, and nanopowders containing nanoparticles, nano clusters or mixture thereof, milled from nano fiber composed of at least one kind of nanoparticles selected from a group consisting of metal, nonmetal, metal oxide, metal compound, nonmetal compound and composite metal oxide, nano ink containing the nanopowders and microrods, the method comprising spinning a spinning solution containing at least one kind of precursor capable of composing at least one kind selected from a group consisting of metal, nonmetal, metal oxide, metal compound, nonmetal compound and composite metal oxide, crystallizing or amorphizing the spun precursor to produce nano fiber containing at least one kind of nanoparticles selected from a group consisting of metal, nonmetal, metal oxide, metal compound, nonmetal compound and composite metal oxide, and milling the nano fiber to fabricate nanopowders containing nanoparticles, nano clusters or mixture thereof.

The invention provides a process for the selective recovery of aluminium, cobalt and platinum, and compounds thereof, from a catalyst composition including aluminium, cobalt and platinum, said proscess including the steps of treating the catalyst composition to selectively get ions of substantially only one of the aluminium. cobalt and platinum into solution, recovering, in separate process steps, the thus treated aluminium, cobalt, or platinum in salt or metal form, and repeating the treating and recovering steps for each of the aluminium, cobalt and platinum. The treating steps may include process steps such as leaching, washing, dissolving, stripping, and the like. The recovery steps may include filtration, precipitation, separation, flocculation, and the like.

A process for recovering a precious metal from a sulfidic material comprises the steps of preparing an acidic aqueous halide solution having an oxidation potential sufficient to oxidise the sulfidic material and render the precious metal soluble in the solution, adding the material to the acidic aqueous halide solution so that the sulfidic material is oxidised and the precious metal is solubilised and separating the precious metal from the oxidised sulfidic material. In addition, a process for removing a contaminant from a contaminated sulfidic material comprises the steps of mixing the material in an aqueous solution wherein a multi-valent species of a relatively high oxidation state oxidises the contaminant to render it soluble in the solution, produces a contaminant refined material, and is reduced to a relatively lower oxidation state; and removing the contaminant from the solution whilst regenerating the multi-valent species to its relatively high oxidation state.

A recovering process for the activated carbon carried Ru catalyst not containing the compound of alkali metal or alkali-earth metal includes such steps as calcining at 600-1000 deg.C for 2-20 hr to obtain gray mixture, mixing it with KOH and KNO3, holding the temp at 300-950 deg.C for 105 hr, cooling, dissolving in hot water at 50-90 deg.C to obtain K2RuO4 solution, adding sodium hypochlorite and concentrated sulfuric acid, distilling to generate RuO4 gas, absorbing it by strong acid solution, and distilling to obtain Ru salt.

There is provided a high-purity ruthenium sputtering target with a low impurity content, in particular producing extremely few particles, which is suitable for applications such as the formation of semiconductor thin films. The high-purity ruthenium sputtering target is manufactured by feeding crude ruthenium powder into a sodium hydroxide solution; blowing an ozone-containing gas while or after blowing chlorine gas into the solution to form ruthenium tetroxide; absorbing the ruthenium tetroxide in a hydrochloric acid solution or a mixed solution of hydrochloric acid and ammonium chloride, and evaporating the solution to dryness; sintering the resultant ruthenium salt in a hydrogen atmosphere to form high-purity ruthenium powder; and hot-pressing the ruthenium powder into a sputtering target.

A process for the recovery of one or more metal values from a metal ore material comprising those of one or more values and a matrix material having a sulfur content wherein the sulfur is present in an oxidation-reduction state of zero or less comprisinga. forming particulates from particles of said ore and an inoculate comprising bacteria capable of at least partially oxidizing the sulfur content;b. forming a heap of said particulates;c. biooxidizing the sulfur content andd. recovering those one or more metal values.

Perovskite-type structure compounds having the general empirical formula ABO3 are prepared by a process comprising subjecting a mixture of starting powders formulated to contain the components represented by A and B in the formula to a high energy milling sufficient to induce chemical reaction of the components and thereby synthesize a mechanically-alloyed powder comprising the perovskite in the form of nanostructural particles. The process according to the present invention is simple, efficient, not expensive and does not require any heating step for producing a perovskite that may easily show a very high specific surface area. Another advantage is that the perovskite obtained according to the present invention also has a high density of lattice defects thereby showing a higher catalytic activity, a characteristic which is highly desirable in their eventual application as catalysts and electronic conductors.