18 results about "Iridium compound" patented technology

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 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.

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.

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 discloses an IrxCo3-xO4 / Ir-Co3O4 heterostructure electrocatalyst as well as a preparation method and application of the IrxCo3-xO4 / Ir-Co3O4 heterostructure electrocatalyst in combination with co-deposition and defect regulation, and belongs to the technical field of catalyst preparation. Comprising the following steps: dissolving an iridium-containing compound and a cobalt-containing compound in deionized water to prepare a precursor solution, and carrying out cathode co-deposition treatment in a three-electrode system; calcining the sample, creating abundant anion and cation vacancies in the material through plasma treatment, and calcining again to eliminate oxygen ion vacancies; the treated sample is soaked in an IrCl3 solution, heat treatment is carried out after the solvent is evaporated to dryness, and the IrxCo < 3-x > O < 4 > / Ir-Co3O4 heterostructure electrocatalyst is prepared. The heterostructure catalyst can effectively improve an electronic structure around an Ir active center, strengthen interaction of a metal-metal oxide carrier, inhibit over-oxidation of atoms in the Ir active center, greatly improve the activity and stability of the catalyst, and improve the catalytic activity of the catalyst. Therefore, the technical problems of low activity, low quality activity and poor stability of a noble metal-based catalyst in the prior art can be effectively solved.

The application discloses a method for preparing platinum group metals from waste materials. The method comprises the following steps: high-temperature calcination of the waste materials with activated carbon and combustion-supporting agents to remove organic matters; high-temperature calcination of the waste materials with zinc powder to activate the waste materials; removal of part of impurities through subsequent oxidation leaching; preparation of a solution and a crystal corresponding to a platinum group metal compound through an oxidation-reduction process; reduction and dissolution of the platinum group metal compound with the aid of a reaction aid; purification of the platinum group metal compound through ammonium sulfide to obtain a pure iridium compound; purification of the pure iridium compound through adsorption resin to obtain a pure rhodium compound crystal; and finally, calcination and reduction to obtain a corresponding high-purity platinum group metal powder.

According to one embodiment, a method of synthesizing an organometallic iridium monomer compound includes obtaining a dimeric iridium compound having a halogenated bridge, refluxing a mixture comprising the dimeric iridium compound, a base, an ancillary ligand, and 1,2-dimethoxyethane for forming a precipitate of an organometallic iridium monomer, and filtering the refluxed mixture to collect the organometallic iridium monomer precipitate.

The present invention relates to an organometallic iridium compound and application thereof. The organometallic iridium compound has a general formula of Ir(La)(Lb)(Lc), where La is a structure as shown in a formula (1), and Lb is a structure as shown in a formula (2). The compound provided in the present invention has the advantages of low sublimation temperature, good optical and electrical stability, high luminous efficiency, long service life, high color saturation and the like, and can be used in an organic light-emitting device. In particular, the compound has the possibility of being applied to the AMOLED industry as a red light-emitting phosphorescent material, especially for display, illumination and vehicle taillights.

Provided is a calcined body that generates photons. The calcined body of the present invention is a calcined body of a composition comprising: (i) alumina; (ii) at least one selected from the group consisting of silica and titanium oxide; (iii) at least one selected from the group consisting of platinum, platinum compounds, palladium, palladium compounds, iridium, iridium compounds, rhodium, and rhodium compounds; and (iv) silicon nitride, in 100 parts by mass of the composition, 5-10 parts by mass of the (iv) silicon nitride is contained.