32 results about "Cobalt catalyst" patented technology

The application relates to a chiral NSiN ligand based on a phenyloxazoline skeleton, a preparation method and application thereof, wherein the chiral NSiN ligand is prepared from a chiral phenyloxazoline bromide with R or S configuration through lithiation and silylation. The chiral NSiN ligand can be used in transition metal catalyzed asymmetric synthesis, and is used in catalyzing an allylic sulfonylation reaction with a cobalt catalyst, and shows high reaction activity and high stereoselectivity.

The application discloses a kind of using cobalt catalyst by unreported double migration coupling strategy, realizes migration asymmetric nitrogen hetero Nozaki-Hiyama-Kishi (aza-NHK) reaction, and the selective preparation α-chiral (E)-allyl amine starting from simple and easy to obtain ortho halogen phenyl ethylene or corresponding E / Z-alkyl bromide or its mixture belongs to the field of organic chemistry and medicinal chemistry.The application under the action of metal cobalt source, ligand, organic additive, inorganic additive etc., makes cyclic sulfonamide and ortho alkenyl substituted aryl halide or alkenyl halide react in organic solvent, to obtain a series of polysubstituted olefins with excellent regioselectivity, stereoselectivity and good yield, which can be used as active drug molecules and important synthetic intermediates.The application uses cheap transition metal cobalt as catalyst, and uses ortho alkenyl substituted aryl iodine and cyclic sulfonamide as raw material, and the reaction condition is warm, simple operation, and good functional group compatibility.

The application discloses a preparation method of a non-conjugated functionalized olefin compound, and the method is carried out in a cobalt / photocatalysis dual catalytic system which is composed of a cobalt catalyst, a ligand, a photocatalyst, a hydrogen source, a base and a solvent. β The target product is efficiently and selectively synthesized through reaction of an ethylenic compound or a halogenated compound or an electron-deficient olefin represented by formula (2) with acetylene as a C2 synthetic unit. The application adopts a cobalt / photocatalysis dual catalytic synergistic mechanism, has mild conditions (normal temperature and pressure, visible light driving), uses water as a green hydrogen source, uses acetylene as a cheap C2 source, has high atom economy, has good substrate universality, and the compound represented by formula (1) is easy to be prepared through Friedel-Crafts acylation or is commercially available, and the compound represented by formula (1) is easy to generate the compound (III) represented by formula (2) under the action of a base. The obtained non-conjugated olefin is a key intermediate for synthesizing high-value-added fine chemicals such as fragrances and insect pheromones, and has wide application prospects.

This invention discloses a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid, its preparation method, and its application. The preparation method includes: S1, pretreating nickel foam (NF); S2, dissolving disodium hydrogen phosphate dodecahydrate and hexadecyltrimethylammonium bromide in a mixture of water and ethylene glycol, adding cobalt nitrate and stirring to obtain a precursor; S3, immersing the nickel foam in the precursor solution and refrigerating it overnight at low temperature; S4, transferring it to a reaction vessel and hydrothermally heating it at 160 °C for 10 hours to obtain cobalt phosphate (CoPO / NF); S5, using CoPO / NF as the working electrode, electrochemically depositing platinum in an H2PtCl6 and KOH electrolyte using cyclic voltammetry; S6, washing and vacuum drying to obtain the final product. This invention is the first to prepare a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid at 100 mA cm⁻¹. ‑2 With a working potential of only 0.67 V at current density (relative to RHE) and a Faraday efficiency of 100% for glycolic acid, it has significant advantages and application potential in the highly selective production of glycolic acid in the electro-oxidation reaction of ethylene glycol.

The application discloses a catalyst for preparing beta-lactone by epoxide carbonylation and a preparation method and application thereof. The catalyst is composed of a homogeneous metal complex and a heterogeneous supported cobalt catalyst. The homogeneous metal complex is one of a porphyrin metal complex and a Schiff base metal complex. The heterogeneous supported cobalt catalyst is composed of a metal center and an organic phosphine ligand polymer connected with the metal center through a coordination bond. The metal center is cobalt, and the organic phosphine ligand polymer is a cross-linked polymer containing a repeating phosphine ligand unit. The metal center is connected with P atoms in the organic phosphine ligand polymer through a coordination bond. The cobalt center forms a stable coordination structure through a ligand, and the coordination layer of cobalt satisfies an electronic saturation state. The cobalt catalyst has high stability, is suitable for a fixed bed or a slurry bed reactor, is favorable for realizing continuous and stable operation of an epoxide carbonylation reaction, and has good industrial amplification potential.

This invention discloses a nitrogen-doped carbon-based supported cobalt catalyst and its application in the degradation of hydroxyl-containing aromatic pollutants. Targeting hydroxyl-containing aromatic pollutants, this invention uses specific conditions to prepare a nitrogen-doped carbon-based supported cobalt catalyst for activating persulfate and degrading specific organic pollutant systems. It establishes a coordination anchoring effect between cobalt and nitrogen-containing sites, improving carbon framework defects and electron transport capabilities, while reducing the risk of metal leaching. This effectively improves catalytic performance and selectivity, achieving efficient activation of persulfate under near-neutral conditions to achieve efficient degradation of hydroxyl-containing aromatic pollutants.

This invention belongs to the field of catalyst preparation and battery energy storage technology, and relates to a cobalt / molecular sieve catalyst. The preparation method of the cobalt / molecular sieve catalyst of this invention includes the following steps: S1: Dissolving the molecular sieve, then impregnating it in a cobalt-containing metal salt solution, sonicating, washing, and drying to obtain a precursor; S2: Grinding the precursor obtained in step S1, and calcining it at 300℃-600℃ for 2-5 hours under an inert gas atmosphere; subsequently, adding the calcined product and dopamine hydrochloride together to a citric acid buffer solution, sonicating, stirring, washing, and drying; S3: Grinding the dried product from step S2, and then using a high-temperature reduction process to confine the metallic cobalt through the pore structure of the molecular sieve, to obtain a molecular sieve-supported cobalt catalyst. This invention prepares a molecular sieve-supported cobalt catalyst and applies it to the membrane layer of a modified lithium-sulfur battery, resulting in excellent rate performance and stable cycle life for the lithium-sulfur battery.

The application discloses a preparation method of a tricobalt tetraoxide catalyst and application thereof, and relates to a preparation method of a tricobalt tetraoxide catalyst, which comprises the following steps: mixing positive electrode powder of a waste lithium cobalt oxide battery with a purified reagent, laying the mixture in a reaction device, and performing oxidation roasting treatment to obtain the tricobalt tetraoxide catalyst. The tricobalt tetraoxide catalyst is prepared by fully utilizing waste lithium ion battery materials on the market, the extraction rate and selectivity of cobalt elements are improved by improving the preparation conditions, the prepared tricobalt tetraoxide catalyst has equivalent catalytic performance as a commercial tricobalt tetraoxide catalyst, and can be used as a catalyst for degradation of organic wastewater. In addition, the method directly utilizes waste positive electrode materials to prepare high-efficiency catalysts, avoids use of expensive high-purity metal salts, realizes additional value utilization of waste, realizes low-cost preparation of high-value-added catalysts, and has important economic and social benefits.

The present invention relates to a method for the continuous hydroformylation of olefins with synthesis gas in the presence of a cobalt catalyst, wherein the method is automated by the use of APC control with at least three controlled variables A, B and C.

This invention relates to a method for synthesizing aromatic carbon-10 sulfur-containing compounds from isoprene. Specifically, using disulfide, isoprene, and 2-methyl-1-buten-3-yne as raw materials, aromatic carbon-10 sulfur-containing compounds are constructed under cobalt catalyst and iodine tandem catalysis. This invention has the following advantages: the raw materials are simple and readily available, the synthesis is simple, it is environmentally friendly, the conditions are mild, and it has high atom economy. The compounds obtained from the bulk chemical isoprene have structures similar to natural terpenes and represent an important class of terpenes.

The invention relates to a method for the selective electro-oxidative fragmentation of lignin using an electrochemical system, comprising the following steps: (i) synthesis of a nickel-cobalt electrocatalyst; (ii) obtaining an anode coated with the electrocatalyst; and (iii) selective fragmentation and oxidation of solubilised lignin in an electrochemical reactor comprising said anode, in which vanillic acid and syringic acid are obtained as preferred products.

This invention provides a method for preparing compound (II) sulfonylpyrazol, comprising the following steps: reacting compound (I) with hydrogen peroxide in the presence of a composite metal catalyst to prepare compound (III); wherein the composite metal catalyst is a combination of a tungsten catalyst and a cobalt catalyst. This invention uses a composite metal catalyst, which can reduce the amount of hydrogen peroxide used, thereby greatly reducing the reaction risk. It has the advantages of high catalytic efficiency and high yield, and the process provided by this invention is more suitable for industrial production.

The application provides a cobalt acetate crystal preparation method based on waste cobalt residue and the cobalt acetate crystal. The preparation method comprises the following steps: S1, hydrogen reduction is performed on the waste cobalt residue to obtain a reduction product; S2, the reduction product is added into an inorganic acid solution, and a cobalt salt product is obtained through first stirring; S3, the cobalt salt product is added into an inorganic alkali solution, and a precipitation product and a residual liquid are obtained through second stirring; S4, the precipitation product is mixed with acetic acid, and the cobalt acetate crystal is obtained after reaction; the waste cobalt residue is a cobalt-containing waste catalyst generated in the oxidation reaction of trimethylphenol to trimethylbenzoquinone by using a supported cobalt catalyst. Through the design and optimization of the reduction, dissolution, precipitation and reaction steps of the waste cobalt residue, the waste cobalt residue is effectively utilized, the recycling of resources is realized, the cobalt acetate crystal prepared has high purity, low impurity content and good application performance.

The present disclosure provides a method for catalytic hydrogenation of trisubstituted acetate or tertiary alkyl ester, comprising the following steps: performing a hydrogenation reaction by using a trisubstituted acetate or tertiary alkyl ester as a substrate in the presence of hydrogen and a manganese catalyst or a manganese catalytic system; the manganese catalyst is selected from compounds represented by formula (1): According to the present disclosure, a metallic manganese catalyst is used to achieve hydrogenation reduction of trisubstituted acetate or tertiary alkyl ester, which, compared to precious metal ruthenium catalysts, has advantages of low costs, easy availability, and low toxicity; and compared to existing inexpensive metal copper or cobalt catalysts, has advantages such as broad substrate applicability, mild reaction conditions, and high yield of target products.

The application relates to a water oxidation electrocatalyst for a proton exchange membrane electrolysis cell anode, in particular to a SnO2-loaded amorphous IrCoO x Anode electrocatalyst and preparation method and application thereof x @The SnO2 proton exchange membrane electrolysis water anode electrocatalyst comprises SnO2 nanoparticles and amorphous IrCoO x nanoparticles, 1.5<= x <=1.9, wherein the mass content of the SnO2 nanoparticles is 16%-42%, the mass content of the IrCoO x nanoparticles is 58%-84%. The application overcomes the defects that the existing OER catalysts cannot simultaneously consider high activity and long-term stability, and thus are not suitable for large-scale commercial application.

The application discloses a mineral-based cobalt catalyst and a preparation method and application thereof. The mineral-based cobalt catalyst is prepared by using dolomite and a cobalt salt as raw materials, using anhydrous ethanol or deionized water as a solvent, and through simple water bath and temperature control calcination methods, and has high catalytic activity and low cobalt ion leaching. The mineral-based cobalt catalyst has the characteristics of low cobalt ion leaching and high catalytic activity, and has a good application prospect in the degradation of organic pollutants by activating persulfate (PMS).

The application discloses a kind of polydifluoroalkylation derivatives of terpene olefin and preparation method thereof, the preparation method includes under inert gas protection, terpene olefin, photosensitizer, cobalt catalyst, organic reducing agent, base, fluorine reagent and organic solvent are sequentially loaded into reaction container, and the reaction system is obtained;Under inert gas protection, the reaction system is reacted at 40~60 ℃ under light condition;After reaction, the system is filtered, rotary evaporated and chromatographically purified, and the polydifluoroalkylation of terpene olefin is completed.The method of the application can efficiently, high selectivity and high yield realize the polydifluoroalkylation reaction of terpene olefin, without using precious metal catalyst, with good functional group compatibility, high yield, and the highest yield can reach 93%.

This invention provides a method for synthesizing γ / δ-heteroaryl-substituted alkyl sulfone derivatives. Under an inert gas atmosphere, an unactivated olefin containing a heteroaryl group (as shown in Formula 1), an electrophilic reagent EX, a photocatalyst, a cobalt catalyst, a proton source, and a basic substance are dissolved in an organic solvent. The reaction is stirred under light irradiation at 420–450 nm. The resulting reaction solution is post-treated to obtain the γ / δ-heteroaryl-substituted alkyl sulfone derivative (as shown in Formula 3). The method exhibits high yield, high regioselectivity, mild reaction conditions, and uses simple, readily available, inexpensive, stable, odorless, and environmentally friendly raw materials, making it a promising candidate for practical applications.

The application provides a preparation method of co-production of 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester, comprising the following steps: S1, carrying out halogenation reaction on a first material containing terephthalic acid ethylene glycol ester, a halogen-containing compound and an acidic catalyst to obtain halogenated terephthalic acid ethylene glycol ester; S2, carrying out a first reaction on a second material containing the halogenated terephthalic acid ethylene glycol ester, a cobalt catalyst, a ligand and an alkaline additive in the presence of carbon monoxide to obtain 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester. The application can realize high-value conversion of terephthalic acid ethylene glycol ester, and simultaneously efficiently co-produce 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester.

The present invention relates to a calixarene-based ligand, a cobalt catalyst comprising such ligand and its use in hydroformylation processes. The Applicant surprisingly found that the calixarene compound is suitable for forming cobalt catalysts, which have good solubility, catalytic performance, recovery performance, and reuse performance.

The application discloses a method for photocatalytic synthesis of aryl alkyl ketone and beta-deuterated aryl alkyl ketone compounds, and belongs to the field of organic synthesis. The method comprises the following steps: under the condition of a composite catalytic system of a photocatalyst, a cobalt catalyst and a ligand, aryl carbinol and olefin are subjected to hydrogen transfer and coupling reaction in an inert gas atmosphere and an organic solvent to obtain aryl alkyl ketone compounds. The application provides a new method for photocatalytic synthesis of dialkyl ketone. The application uses aryl carbinol olefin and hydrocarbon as starting materials, utilizes a catalytic system of a photocatalyst / cobalt catalyst, and realizes rapid construction of aryl alkyl ketone compounds through hydrogen transfer and coupling reaction of aryl carbinol and olefin. The method has the advantages of mild conditions, high economic efficiency of steps, good regioselectivity and wide substrate range.

The invention provides a method for catalytically hydrogenating trisubstituted acetate or tertiary alkyl ester, which comprises the following step: in the presence of hydrogen and a manganese catalyst or a manganese catalytic system, carrying out hydrogenation reaction by taking trisubstituted acetate or tertiary alkyl ester as a substrate, wherein the manganese catalyst is selected from a compound as shown in the following formula (1), hydrogenation reduction of trisubstituted acetate or tertiary alkyl ester is achieved by adopting the metal manganese catalyst, and compared with a noble metal ruthenium catalyst, the metal manganese catalyst has the advantages of being low in price, easy to obtain and low in toxicity; compared with the existing cheap metal copper catalyst or cobalt catalyst, the method has the advantages of wide substrate practicability, mild reaction conditions, high target product yield and the like.

The application discloses a preparation method and device of a praseodymium monatomic supported tricobalt tetraoxide catalyst for water electrolysis oxygen evolution, and belongs to the technical field of electrochemical catalytic materials, in particular to the following: a precursor solution is obtained by mixing and dissolving cobalt nitrate and praseodymium nitrate, is coated on the surface of a conductive substrate, is subjected to vacuum drying treatment to form a precursor film layer, is placed in an air atmosphere, is calcined at 300 DEG C to 400 DEG C for 1 to 3 hours, and is cooled to obtain a praseodymium monatomic supported tricobalt tetraoxide catalyst for water electrolysis oxygen evolution. In the absence of noble metals, the application realizes high activity and high stability comparable to noble metal catalysts, and provides a promising material system and solution for the low-cost and large-scale commercial application of proton exchange membrane water electrolysis technology.

The application relates to the technical field of chemical catalyst application, and provides application of a cobalt catalyst in a CO2 hydrogenation reaction for preparing carbon nanotubes, which is obtained by controlling a precursor morphology / exposed crystal surface in-situ reconstruction process to obtain the application of the cobalt catalyst in the CO2 hydrogenation reaction for preparing carbon nanotubes, wherein the precursor of the cobalt catalyst is a Co3O4 octahedron mainly exposing a {111} crystal surface, and the in-situ reconstruction process is a CO2 hydrogenation reaction condition; the catalytic performance of the cobalt catalyst is superior to that of cobalt catalysts obtained by in-situ reconstruction of Co3O4 cubes mainly exposing a {100} crystal surface and Co3O4 nanorods mainly exposing a {110} crystal surface. Compared with an existing catalytic process, the carbon nanotube yield is high, the preparation process is simple, the catalytic reaction condition is mild, and the application is suitable for popularization and application.

This invention discloses a method for preparing 5-chlorofuronic acid, comprising the following steps: 1) preparing sodium hydroxide solution and 5-chlorofuraldehyde solution in two beakers respectively; 2) adding the sodium hydroxide solution prepared in step 1) to the beaker containing the 5-chlorofuraldehyde solution, and then stirring. After stirring evenly, adding a copper-cobalt catalyst, and then adding an oxidant solution dropwise while stirring. After the addition is complete, stirring is continued. After the reaction is complete, hydrochloric acid is added to adjust the pH value of the reaction system. When the pH value is 2-3.5, most of the solvent is removed by vacuum distillation, and a solid precipitates out. The reacted material is filtered to obtain the filtered solid, which is dried to obtain a light yellow solid, which is the 5-chlorofuronic acid to be prepared. The preparation process of this invention is simple, and the raw materials and solvents used are all green and environmentally friendly, and the yield of the prepared 5-chlorofuronic acid is high.

The application discloses a carbon nitride / kaolin supported monatomic cobalt catalyst and a preparation method and application thereof, relates to the technical field of mineral-based catalysts, and the preparation method comprises the following steps: after kaolin, melamine and cobalt (III) acetylacetonate are fully ground, the mixture is calcined under an inert atmosphere, and the cobalt-carbon nitride / kaolin catalyst is obtained after cooling, washing and drying. During the calcination process, the layered kaolin induces the carbon nitride to generate cyano defects, provides an anchoring space for the monatomic cobalt, the metal cobalt is highly dispersed in the form of monatomic cobalt, and the nitrogen atom forms Co-N coordination. The catalyst is used for visible light synergistic activation of peroxymonosulfate to degrade organic pollutants, the degradation rate of orange II reaches more than 90% within 3 min, the degradation rate reaches more than 95% within 5 min, and the excellent degradation performance is still maintained after the catalyst is used for 5 cycles. The preparation method has the advantages of simple process, short period and low cost, the obtained catalyst has high activity and good stability, and has a wide application prospect in the field of water environment remediation.

The application discloses a high-performance cobalt-based catalyst for synthesizing dimethyl carbonate by methanol carbonylation oxidation and a matching reaction system thereof. 0 @Co 3+ ‑N x The active center with a core-shell structure is precisely constructed by using a defective carbon nitride containing a high-density nitrogen vacancy as a carrier through an integrated strategy of defect regulation, interface assembly and phase reconstruction. The structure realizes a dimethyl carbonate selectivity of greater than or equal to 99% in the reaction through a spatially separated oxidation-reduction synergistic mechanism, significantly improves the deactivation resistance of the catalyst by virtue of a stable coordination structure, and is completely free of chlorine, thereby fundamentally solving the equipment corrosion problem caused by the chlorine contained in the catalyst in a traditional process. The matching reaction system adopts a multi-stage gas-lifting reactor and a cross-flow separator, realizes efficient and mild separation and continuous circulation of the catalyst, and thereby jointly ensures efficient, stable and long-period operation of the whole process.

The application discloses a method for synthesizing vinylsilane by acetylene and hydrogen silane hydrosilication; the method is prepared by heating reaction under the action of a solvent, a cobalt catalyst and a ligand, or under the action of the solvent, the cobalt catalyst, the ligand and an additive, and the raw materials are acetylene and hydrogen silane; wherein m is an integer of 1-3, n is 4-m; y is an integer of 1-m, and x is m-y; R is independently selected from C1-C18 alkyl, substituted C1-C6 alkyl, benzofuranyl, benzothiophenyl, thiophenyl, benzyl or C1-C6 alkoxy. The raw material source of the preparation method is simple, the substrate range is wide, the operation is simple, the condition is mild, the production can be scaled up, and the demand of research and development and production in the fields of organic, chemical, medicine, material and the like can be met.