29 results about "Iridium compound" patented technology

The invention provides an iridium / cobaltosic oxide mesoporous monocrystal oxygen evolution catalyst and a preparation method thereof, and relates to the technical field of catalyst preparation, and the preparation method comprises the following steps: S1, preparing a mesoporous monocrystal cobalt hydroxide sheet; s2, dispersing mesoporous monocrystal cobalt hydroxide and an iridium-containing compound in an ethanol-water mixed solution, heating to a certain temperature, stirring to react for a period of time, and then washing and drying a reaction product; and S3, roasting the dried reaction product in an air atmosphere for a period of time to obtain the catalyst. The catalyst disclosed by the invention has high Ir load, extremely low overpotential and ultrahigh stability, and has huge potential in practical application of electrolyzed water.

The invention discloses a mesoporous iridium oxide catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving an iridium-containing compound, nitrate and urea in water, and uniformly stirring and mixing to obtain a mixed solution; carrying out rotary evaporation drying on the mixed solution to obtain a uniform catalyst precursor; calcining the precursor in an air atmosphere to obtain an iridium oxide catalyst; the iridium-containing compound comprises but not limited to one or more of chloroiridic acid, potassium chloroiridate and iridium trichloride, the nitrate comprises but not limited to one or more of sodium nitrate, ammonium nitrate and potassium nitrate, the molar ratio of the urea to the iridium-containing compound in the mixed solution is (1-100): 1, and the molar ratio of the nitrate to the iridium-containing compound is (1-100): 1; the mesoporous iridium oxide prepared by the invention has an ultrahigh specific surface area, is beneficial to exposure of active sites and optimization of mass transfer in a reaction process, and effectively reduces the noble metal loading capacity of a proton exchange membrane electrolyzed water anode catalyst.

The application discloses an iridium complex, a preparation method thereof and application of the iridium complex in synthesis of chiral piperidines, and the preparation method of the iridium complex comprises the following steps: adding an indole compound, an iridium compound and an alkali into a first solvent, heating and stirring at 40-80 DEG C, lowering to room temperature after reaction, filtering, reducing pressure distillation, and separating by silica gel column chromatography to obtain the iridium complex; under the cooperation of the iridium complex as a catalyst and chiral phosphoric acid, 1,5-diol compounds and amine compounds can be directly reacted to obtain a series of chiral piperidine compounds, the method has the advantages of high reaction efficiency, simplicity and high yield, and the enantiomeric excess value of the chiral piperidine prepared by using the iridium catalyst is not less than 83%.

The application relates to a kind of metal iridium complex and its application.The metal iridium compound has the general formula of Ir (La) (Lb) (Lc), wherein La is the structure shown in formula (1), and Lb is the structure shown in formula (2).The compound provided by the application has the advantages of good light and electrical stability, high luminous efficiency, long service life, high color saturation, etc., and can be used in organic light-emitting devices, especially as red light-emitting phosphor materials, and has the possibility of being applied to the AMOLED industry, especially for display, lighting and automobile tail light.

The present application relates to the technical field of hydrogen production catalyst for water electrolysis, in particular to a carbon-coated iridium dioxide hydrogen production catalyst for water electrolysis, a preparation method and application thereof, wherein the preparation method of the carbon-coated iridium dioxide hydrogen production catalyst for water electrolysis comprises the following steps: preparing a carbon-coated iridium dioxide precursor powder by using iridium compounds, carboxyl carbon compounds and an oxidizing agent, then performing a calcination oxidation reaction, immediately performing a rapid cooling treatment after the calcination is completed to obtain an initial catalyst, and finally obtaining the carbon-coated iridium dioxide hydrogen production catalyst for water electrolysis by washing, filtering and heating drying. The prepared catalyst has excellent electrocatalytic activity and stability, and the catalyst crystal has a microporous structure and a high specific surface area. The nano structure with a high specific surface area is beneficial to further improving the catalytic activity, and the catalyst load of Ir is reduced while ensuring the catalytic activity, thereby significantly reducing the cost. The catalyst has a good application prospect in the hydrogen evolution and oxygen evolution reactions of water electrolysis.

A process for the manufacture of a catalyst-coated polymer electrolyte membrane for a water electrolyser comprising an iridium-containing anode layer is provided. The process comprises the steps of: (i) provision of a polymer electrolyte membrane with a first major surface and a second opposed major surface; (ii) plasma treatment of the first major surface of the polymer electrolyte membrane to form an etched polymer electrolyte surface layer; (iii) vapour deposition of an iridium-containing compound onto the etched polymer electrolyte surface layer to form the iridium-containing anode layer.

An oxygen evolution reaction (OER) catalyst material is provided. The OER catalyst material comprises an iridium-containing compound on a particulate catalyst support and has the following characteristics: a BET surface area in the range of and including 35 to 55 m2 / g; an iridium content in the range of and including 25 to 45 wt% with the proviso that if the BET surface area is greater than 45 m2 / g the iridium content is at least 35 wt%; a Tmax in the temperature-programmed reduction profile of the OER catalyst material of less than 135 °C.

The present invention discloses a bifunctional electrocatalyst and a preparation method and application thereof. The bifunctional electrocatalyst comprises a niobium-doped titanium dioxide carrier and iridium nanoparticles loaded on the carrier, wherein the carrier is a niobium-doped titanium dioxide composite. The preparation method comprises: adding a titanium-containing organic matter and a niobium-containing compound to an acidic solution containing polyethyleneimine, stirring, heating for reaction, and drying to obtain the niobium-doped titanium dioxide composite; dripping a solution containing an iridium compound into a dispersion of the niobium-doped titanium dioxide composite, gradient heating for reaction, washing, and drying to obtain the bifunctional electrocatalyst. In the present application, niobium-doped titanium dioxide is used as a carrier to prevent electrochemical oxidative corrosion and improve catalytic stability. At the same time, doping niobium into the carrier improves the conductive properties of the carrier, which is conducive to better dispersion and anchoring of the iridium precious metal, thereby improving the catalytic activity and stability of oxygen evolution reaction (OER) and heat reduction reaction (HER) in an acidic environment.

The present invention discloses an alkylamine iridium complex, a synthesis method and an application thereof, wherein the molecular formula thereof is [Ir III (R3N) n (NH3) 6‑n ]Cl3 or [Ir III (R4R'N2) n (NH3) 6‑2n ]Cl3, where n is an integer from 1 to 6. The preparation method comprises: 1) weighing ammonium chloroiridate and placing it in a sealed container, introducing NH3 (g), and obtaining an off-white hexaammineiridium trichloride through a gas-solid reaction; 2) slowly adding an alcoholic solution of an alkylamine dropwise to a flask containing solid hexaammineiridium chloride, heating and stirring, and obtaining an alkylamineiridium complex after the reaction. Applications include: use in the preparation of iridium nanomaterials, use as a precursor for the preparation of iridium nanomaterials, or use as a raw material for the synthesis of other alkylamineiridium compounds. The method of the present invention solves the problems of difficult to control iridium nanometer size and uneven dispersion in the prior art. Using the designed and synthesized alkylamineiridium complex, a chemical reduction method can achieve controllable preparation of iridium nanomaterials.

Provided is a method for manufacturing an electrolysis electrode having a catalyst with excellent catalytic activity such as low oxygen overvoltage and excellent stability such as reducing the loss of catalyst components such as iridium (Ir). A method for manufacturing an electrolysis electrode includes the following steps: a step of coating a surface of a conductive substrate with a catalyst precursor composition containing an iridium component, etc.; a step of heat-treating the conductive substrate coated with the catalyst precursor composition to obtain a first fired product; and a step of heat-treating the first fired product to form a catalyst layer containing iridium oxide on the surface of the conductive substrate, wherein the iridium component is an iridium compound containing a carboxyl group, and in the catalyst precursor composition, the content of nickel (Ni) is 10 to 35% by mass, the content of cobalt (Co) is 25 to 55% by mass, and the content of iridium (Ir) is 15 to 55% by mass (wherein, Ni + Co + Ir = 100% by mass).

The present invention relates to an oxygen evolution electrode catalyst comprising bismuth (Bi), wherein the bismuth exists together with iridium or an iridium compound to provide improved durability in an oxygen evolution reaction.

Oxygen evolution reaction (OER) catalyst materials are provided comprising an iridium- containing compound on a particulate catalyst support, the OER catalyst material having the following characteristics: (i) a BET surface area in the range of and including 5 to 20 m2 / g; (ii) an iridium content in the range of and including 25 to 50 wt%; and (iii) a Tmax in the temperature-programmed reduction profile of the OER catalyst material is in the range of and including 145 to 180 °C.

There provided a method for producing an electrolysis electrode having excellent catalytic activity such as low oxygen overpotential and including a catalyst having excellent stability such as reducing loss of a catalyst component such as iridium (Ir). The method for producing an electrolysis electrode includes a step of coating a catalyst precursor composition containing an iridium component and the like on a surface of an electrically conductive substrate, a step of obtaining a primary baked product by thermal treating the electrically conductive substrate coated with the catalyst precursor composition, and a step of forming a catalyst layer containing an iridium oxide on the surface of the electrically conductive substrate by thermal treating the primary baked product, wherein the iridium component is an iridium compound containing a carboxy group, and the content of nickel (Ni) is 10 to 35% by mass, the content of cobalt (Co) is 25 to 55% by mass, and the content of iridium (Ir) is 15 to 55% by mass in the catalyst precursor composition, provided that Ni+Co+Ir=100% by mass.

Provided is a method for preparing 1,2-pentanediol, including subjecting 2-hydroxypentanal and hydrogen to hydrogenation reduction under an action of a catalyst to obtain the 1,2-pentanediol; wherein the catalyst is a supported nickel-based catalyst; the supported nickel-based catalyst comprises a carrier and an active component supported on the carrier; the active component comprises a first component and a second component; the first component is a nickel compound; and the second component is one or more selected from the group consisting of a copper compound, a cobalt compound, a platinum compound, an iridium compound, a rhodium compound, and a rhenium compound.

The present invention relates to an organometallic iridium compound and its application. The organometallic iridium compound has the general formula Ir(La)(Lb)(Lc), wherein La has the structure shown in formula (1) and Lb has the structure shown in formula (2). The compound provided by the present invention has advantages such as high optical and electrical stability, low sublimation temperature, narrow emission half-width, high color saturation, high luminous efficiency, and long device life, and can be used in organic electroluminescent devices. In particular, as a red light-emitting dopant, it has potential applications in the AMOLED industry, particularly in displays, lighting, and automotive taillights. #imgabs0#

The invention belongs to the technical field of synergistic extraction, and particularly relates to a method for synergistically and co-extracting platinum and iridium by using a composite extracting agent. According to the method, an amino-containing extraction agent and a phosphorus-containing extraction agent are innovatively compounded to obtain the synergistic extraction agent, and the volume ratio of the amino-containing extraction agent in an organic phase is controlled to be 1-62%, and the volume ratio of the phosphorus-containing extraction agent in the organic phase is controlled to be 1-62%. According to the method, two extractants are used for extracting platinum and iridium, so that the two extractants play a synergistic role to the greatest extent, then the synergistic extractant is used for extracting a solution containing platinum and iridium, finally, the platinum and the iridium are separated from the extractants through reverse extraction, and finally a mixture only containing a platinum compound and an iridium compound is obtained. The platinum and the iridium in the mixture can be subsequently separated according to needs. By adopting the method disclosed by the invention, platinum and iridium can be effectively recovered from a mixture of various substances, and the recovery rate of platinum and iridium is greater than 99.5%.

The invention provides a PtIrZn difunctional electrocatalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalysts.The PtIrZn difunctional electrocatalyst comprises a ZIF-8 carrier and PtIrZn ternary alloy nanoparticles loaded on the ZIF-8 carrier; the preparation method comprises the following steps: adding the carrier ZIF-8 into a solvent, uniformly dispersing, adding a platinum-containing compound, an iridium-containing compound and a zinc-containing compound, uniformly mixing, continuously adding a reducing agent, carrying out ultrasonic reaction, centrifuging, washing and drying to obtain the PtIrZn bifunctional electrocatalyst. According to the invention, ZIF-8 is used as a carrier to load PtIrZn ternary alloy nanoparticles, the catalyst with high specific surface area and ternary metal coordination effect is synthesized, and excellent performance of high current density and high catalytic stability are realized in both oxygen reduction and hydroxide reactions.

The invention relates to a synthetic method of high-purity chloroiridic acid. The synthetic method comprises the following specific operation steps: S1, pretreating an iridium source containing iridium metal; s2, reacting the pretreated iridium source with chlorine in a reaction kettle to generate a chloroiridic acid solution; s3, purifying the chloroiridic acid solution to obtain a chloroiridic acid crystal; and S4, washing and drying the chloroiridic acid crystal to obtain a chloroiridic acid product. The catalyst is adopted to catalyze the reaction of the iridium powder and the chlorine, so that the generation rate and the purity of the chloroiridic acid are improved, and the yield of the chloroiridic acid is improved; the acid solution is used as a solvent of the iridium compound, so that the solubility of the iridium compound is improved, the reaction time is shortened, and the energy consumption is reduced; chloroiridic acid crystals are treated by adopting the steps of washing, drying and the like, so that the purity and the stability of chloroiridic acid products are improved.

This invention provides a method for recovering Pt and Ir from waste water electrolysis membrane electrodes, comprising the following steps: Step S1. Dissolving and separating platinum and iridium: The waste water electrolysis membrane electrode is soaked in an organic solvent and separated to obtain a catalyst mixture residue. The catalyst mixture residue is added to a first reagent and calcined at high temperature to obtain precious metal residue. The precious metal residue is dissolved in hydrochloric acid and filtered to obtain a mixed residue. Then, the mixed residue is dissolved in a solvent and filtered to obtain chloroplatinic acid and iridium residue. The chloroplatinic acid is then reduced and purified to obtain platinum compound or platinum black. Step S2. Separating iridium: The iridium residue is added to a second reagent to oxidize and dissolve the iridium residue into chloroiridium acid and insoluble residue. The chloroiridium acid is oxidized with an oxidant, and then ammonium chloride is added and stirred to precipitate it to obtain ammonium chloroiridate. After purification, iridium compound or iridium black is prepared, and the insoluble residue is dissolved in aqua regia for reuse. This invention adds hydroxide to the precious metal residue during calcination, minimizing mechanical entrainment loss and preventing melt splashing during oxidative calcination.

To provide a method for producing a new cyclopenta-fused polycyclic aromatic hydrocarbon (CP-PAH) compound.SOLUTION: A method for producing a CP-PAH of the present invention comprises obtaining a compound having, as at least a partial structure, the structure represented by formula (2), by subjecting a reaction substrate having, as at least a partial structure, the structure represented by formula (1), to the action of a catalyst comprising at least one selected from the group consisting of a platinum compound, a palladium compound, and an iridium compound under hydrothermal synthesis conditions. The temperature of the hydrothermal synthesis conditions is preferably 150°C or more.SELECTED DRAWING: None

The synthesis method comprises the following steps: by taking an aldehyde group as a guiding group, taking a (hetero) aryl aldehyde compound and a (hetero) aromatic compound as reaction substrates and taking an iridium compound as a catalyst, carrying out reaction on the aldehyde group and the (hetero) aromatic compound under the synergistic effect of an oxidizing agent, an additive, a solvent, temperature and time, so as to obtain the (hetero) aromatic compound. Through a C-H / C-H oxidative coupling mode, the ortho-position aldehyde group substituted di (hetero) aromatic compound is efficiently prepared, and the technical problems that the aldehyde group coordination capacity is weak, side reactions are prone to occurring and the like are solved. Meanwhile, the bis (hetero) aromatic hydrocarbon compound and the derivative thereof can be used as a multicolor fluorescent probe with excellent performance, specific marking and high-resolution imaging of lipid droplets in living cells and mouse fatty liver are realized, and a new tool is provided for diagnosis of metabolic diseases.

The invention relates to the technical field of catalysts for hydrogen production by electrolysis of water, in particular to a carbon-coated iridium dioxide catalyst for hydrogen production by electrolysis of water as well as a preparation method and application of the carbon-coated iridium dioxide catalyst for hydrogen production by electrolysis of water, the preparation method of the carbon-coated iridium dioxide catalyst for hydrogen production by electrolysis of water comprises the following steps: preparing carbon-coated iridium dioxide precursor powder from an iridium compound, a carboxyl carbon compound and an oxidizing agent; the preparation method comprises the following steps: carrying out a calcination oxidation reaction on a carbon-coated iridium dioxide aqueous electrolysis hydrogen production catalyst, immediately carrying out rapid cooling treatment after calcination is finished to prepare an initial catalyst, and carrying out washing, filtering and heating drying to prepare the carbon-coated iridium dioxide aqueous electrolysis hydrogen production catalyst. The prepared catalyst has excellent electrocatalytic activity and stability, the catalyst crystal has a microporous structure and a high specific surface area, the nanostructure with the high specific surface area is beneficial to further improvement of the catalytic activity, and the loading capacity of the catalyst to Ir is reduced while the catalytic activity is ensured, so that the cost is remarkably reduced. The catalyst has a good application prospect in water electrolysis hydrogen evolution and oxygen evolution reactions.