170 results about "Cobalt catalyst" patented technology

The invention provides a catalyst, a preparation method and application thereof, and a method for preparing primary amine by catalyzing nitrile compound hydrogenation, and particularly relates to the technical field of catalyst synthesis. The catalyst comprises a nickel / cobalt-based catalyst and a metal salt; wherein the nickel / cobalt-based catalyst is selected from any one of a supported nickel / cobalt-based catalyst, a Raney nickel / cobalt catalyst or a nickel / cobalt nanocrystal; the metal salt comprises any one or a combination of at least two of tungsten salt, molybdenum salt, vanadium salt, aluminum salt and cerium salt. The metal salt and the nickel / cobalt main catalyst have a synergistic effect: the surface electron density is adjusted through electron transfer, the hydrogen dissociation and cyano adsorption activation capacities are enhanced, the hydrogenation activity is improved, and the mild condition reaction is assisted; the surface chemical environment is changed or steric hindrance is borrowed, the primary amine selectivity is improved, and byproducts are inhibited; aluminum salt, cerium salt and the like inhibit nickel / cobalt agglomeration, increase active sites, enhance stability, prolong the service life and reduce the dosage.

The invention provides a hollow cobalt phosphide catalyst for oxidation of 5-hydroxymethylfurfural and preparation of the hollow cobalt phosphide catalyst. A preparation method comprises the following steps: (1) dispersing ZIF-67 in an ethanol-water solution for reflux heating etching; and (2) carrying out low-temperature phosphorization on the ZIF-67 (at) Co (OH) 2 to obtain the hollow cobalt phosphide catalyst. The MOF-derived hollow cobalt phosphide catalyst disclosed by the invention is used for electrocatalytic oxidation of 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid, has a hollow structure, fully exposes Co sites, induces conversion to Co < 3 + > and Co < 4 + > to a greater extent, remarkably improves catalytic activity and promotes reaction kinetics. The synthesis method disclosed by the invention is simple, convenient, green and environment-friendly, solves the problem that the whole catalytic efficiency is limited due to the fact that phase change only occurs at Co sites on the surface and the interior is not fully utilized due to a compact microstructure of a traditional cobalt-based nano material, and has a good application prospect.

The invention discloses a low-defect molecular sieve supported cobalt catalyst for propane dehydrogenation and a preparation method thereof. The cobalt-based molecular sieve catalyst comprises a low-defect molecular sieve (L-Zeoliite) carrier and an active component cobalt loaded on the molecular sieve carrier. The preparation method of the Co / L-Zeoliite catalyst comprises the following steps: repairing defects of the defective molecular sieve carrier, and loading the active component cobalt on the low-defect molecular sieve. According to the method, various commodities or self-made molecular sieves are adopted, the low-defect molecular sieve carrier is synthesized through innovative alkali liquor repairing, monatomic Co or ultra-small CoO clusters can be limited to the low-defect molecular sieve through the method, and the activity of the molecular sieve catalyst is far higher than that of a conventional defect (silicon hydroxyl nest) limited Co molecular sieve catalyst and is higher than that of most noble metal-based catalysts. In addition, the invention further provides a process for synthesizing the catalyst through a one-pot method, the dosage of active metal is greatly reduced, the synthesis process is simplified, the applicability to raw materials and carriers is high, and the application prospect is good.

The invention discloses a catalytic filter material loaded with a Mn-CoOx composite metal oxide, a preparation method of the catalytic filter material and a regeneration method after sulfur poisoning, and belongs to the technical field of industrial tail gas denitration. According to the catalytic filter material prepared by the invention, through a complete technical route of surface functional modification of polydopamine, hydrothermal in-situ growth of a manganese-cobalt catalyst and activation by dipping in hydrogen peroxide, the dust removal function of the catalytic filter material used as the filter material is reserved, and the originally inert polymer fiber surface is activated, so that the catalyst is uniformly dispersed on the surface of the filter material and is firmly loaded on the surface of the filter material. The catalytic filter material which is poisoned and inactivated by sulfur dioxide is soaked in the hydrogen peroxide solution, so that the catalyst is regenerated, the method has the advantages of greenness, simplicity, convenience, low cost and the like, and the service life of the catalytic filter material is effectively prolonged. In conclusion, the catalytic filter material prepared by the invention is high in denitration rate, strong in combination firmness, good in stability, renewable after inactivation, green and low in cost, and has important application value in the technical field of dust removal and denitration.

The invention relates to a zeolite-based cobalt catalyst and a preparation method and application thereof, and belongs to the technical field of advanced oxidation of persulfate. The preparation method comprises the following steps: mixing zeolite and cobalt salt in water for ion exchange, and then filtering and drying to obtain precursor powder; and carrying out ball milling on the precursor powder to obtain the zeolite-based cobalt catalyst, and activating PMS to degrade organic pollutants by using the zeolite-based cobalt catalyst. The zeolite-based cobalt catalyst increases the utilization rate of a metal active center by confining part of metal active sites, creates a nanoscale heterogeneous reaction space, shortens the internal diffusion distance, and realizes a more efficient and faster catalytic oxidation process.

The invention provides a modified cobalt catalyst and a preparation method and application thereof. The invention provides a modified cobalt catalyst which comprises a cobalt element, an aluminum element, a transition metal element, other metal elements of the group IIIA except the aluminum element, an alkali metal element, an alkaline earth metal element and a boron element, and the boron element exists in the form of a B-O-Al bond. The modified cobalt catalyst has the characteristics of high activity and high selectivity when used for reducing nitrile compounds.

The present disclosure relates generally to a supported Fischer-Tropsch catalysts and Fischer-Tropsch synthesis processes for preparing hydrocarbons using the same. The catalyst materials described herein include a support material; cobalt, present in an amount in the range of 5 to 25 wt%, based on the total weight of the catalyst material; and gallium, present in an amount in the range of 0.1 to 10 wt%, based on the total weight of the catalyst material.

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 invention relates to the technical field of precious metal recovery and water treatment, in particular to application of cobalt catalytic activation persulfate in recovery of gold in thiosulfate leachate. The invention provides application of cobalt catalytic activation persulfate in recovery of gold in thiosulfate leachate. The method comprises the following steps: blending a cobalt catalyst, persulfate and a thiosulfate leaching solution containing Au (S2O3) 2 < 3->, and carrying out complex breaking reduction to obtain a gold elementary substance. The CoNC / persulfate technology provided by the invention is proved to be a catalytic system based on singlet oxygen species, has high oxidation capacity and strong complex breaking selectivity, shows remarkable solution acid-base property adaptation and coexisting cation / anion interference resistance, and has ultrahigh recovery selectivity.

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 invention relates to the technical field of organic synthetic chemistry, and discloses a preparation method of alkenyl gem-diborate. According to the preparation method of the alkenyl gem-diborate, a cobalt catalyst serves as a core, a high-activity cobalt complex is formed under the combined action of a specific ionic N-heterocyclic carbene ligand and alkali, the complex can be reduced into a catalytic activity intermediate by a boron test, regeneration of the cobalt catalyst is achieved, and the next round of reaction continues to be catalyzed. The adopted cobalt catalyst is rich in reserves, low in price, easy to obtain and environment-friendly; reaction conditions are mild, and high efficiency and high selectivity are achieved; the reaction substrate functional group tolerance is high, the substrate source is wide, the method is suitable for aromatic alkyne, and aliphatic alkyne and alkyne with large steric hindrance can also be adopted; the reaction can be amplified to a gram scale for preparation; the yield, the selectivity and the purity of the product are improved; the invention provides a new synthesis route and method for alkenyl gem-diborates, and can provide alkenyl gem-diborates with various structures for synthesis of polysubstituted olefins, natural products or pharmaceutical molecules.

The application provides a carbide-supported cobalt catalyst and a preparation method and application thereof, and the obtained carbide-supported cobalt catalyst has high catalytic activity. In the application, MAX is used as raw material, and a cobalt catalyst is anchored on an MXene carrier in the process of etching MXene by molten salt. The carbide-supported cobalt catalyst has a special flower-shaped or accordion-shaped structure, so that the specific surface area is large and more catalyst loading sites are provided, which is beneficial to the activation of PMS by cobalt and the degradation of organic pollutants.

The invention discloses a silylene ligand supported metal cobalt catalyst and a preparation method and application thereof, and belongs to the technical field of metal organic catalyst.The preparation method comprises the steps that indole and n-butyllithium serve as raw materials and are subjected to a deprotonation reaction in a tetrahydrofuran solvent at the room temperature, 2-lithium indole is obtained, a tetrahydrofuran solution of chlorosilylene is added at the low temperature, and the 2-lithium indole is obtained; and carrying out nucleophilic substitution reaction at room temperature, and substituting Li in 2-lithium indole with silicon in chlorosilylene to obtain the silylene ligand. The preparation method comprises the following steps: taking a silylene ligand and a cobalt complex as raw materials, carrying out ligand substitution reaction at room temperature in a tetrahydrofuran solvent, and substituting a ligand in the cobalt complex with the silylene ligand to obtain the metal cobalt catalyst supported by the silylene ligand. The prepared metal cobalt catalyst supported by the silylene ligand is used for catalyzing olefin hydrosilylation reaction, ultrahigh catalytic activity is shown, complete conversion of olefin is achieved, Markov products are obtained with excellent selectivity, and therefore the problems of cost and product selectivity in industrial production are solved.

The invention discloses a cascade bifunctional catalyst, a preparation method thereof and application of the cascade bifunctional catalyst in CO2 high value-added catalytic conversion, and belongs to the technical field of chemical catalysis. The cascade bifunctional catalyst is formed by compounding a sodium-iron-cobalt catalyst, a potassium-copper-zinc-aluminum catalyst and a molecular sieve, and the catalyst can realize high-selectivity preparation of aromatic hydrocarbon by hydrogenation of carbon dioxide (CO2) through an ethanol-coupled olefin conversion route. A new reaction path provided by the constructed cascade bifunctional catalyst can effectively regulate and control front-section reaction product distribution, the mass transfer and heat transfer performance of the catalyst is remarkably optimized, and then the selectivity and reaction efficiency of a target product are improved.

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.

The invention discloses a phosphorized cobalt vanadate catalyst for electrosynthesis of urea and a preparation method of the phosphorized cobalt vanadate catalyst, and belongs to the technical field of electrocatalysis. The problems of low Faraday efficiency and yield in the existing electro-catalytic urea synthesis reaction process are solved. The bimetallic catalyst P-CoVO-NF for synthesizing urea through efficient electro-catalysis of co-reduction of nitrate and carbon dioxide is constructed by taking Co and V as bimetallic active sites, and the bimetallic catalyst is of a nanosheet structure, uniform in element distribution, good in stability and excellent in charge transfer capacity. And when nitrate is subjected to electro-catalysis reduction, excellent Faraday efficiency and yield are shown. A test result shows that the urea yield of the P-CoVO-NF catalyst reaches up to 124.9 umol.h <-1 >. Cm <-2 > in a mixed solution of KNO3 and KHCO3 at-0.6 V vs.RHE, and the urea yield is kept stable after 10 cycle periods.

The invention provides a method for synthesizing a 3-alkylated quinoxaline-2 (1H)-ketone compound through visible light catalysis and application of the 3-alkylated quinoxaline-2 (1H)-ketone compound, and belongs to the technical field of catalytic synthesis. The method comprises the following steps: under visible light, a quinoxaline-2 (1H)-ketone derivative is excited by light to reach an excited state and then reacts with an alkylating reagent to obtain an alkyl carbon free radical; further, the quinoxaline-2 (1H)-ketone is attacked, so that the synthesis of the 3-alkylated quinoxaline-2 (1H)-ketone derivative is realized; according to the method, the quinoxaline-2 (1H)-ketone derivative is directly excited under the visible light condition, no extra photocatalyst is needed, the application of an equivalent oxidant is avoided due to the use of a catalytic amount of cobalt catalyst, and particularly, the method also has the advantages of simple reaction raw materials, high product yield and mild reaction conditions.

The invention discloses a reaction method for preparing an olefin by deacylation of a ketone induced by visible light, comprising: (1) dissolving a ketone and 2-pyridylhydrazoneamide in a solvent, adding an activation additive, and heating under an inert gas atmosphere for an activation reaction to obtain a dihydrotriazole aromatization precursor; and (2) mixing the product of step (1) with an olefin with or without purification, and performing a photocatalytic reaction under a photocatalyst, a cobalt catalyst, a base, an additive, a solvent, and illumination conditions to obtain a deacylated olefin product of the ketone. The reaction method for preparing an olefin by deacylation of a ketone of the present invention has the advantages of simple and readily available raw materials, mild reaction conditions, and wide substrate applicability, and meets the requirements for developing green and environmentally friendly chemistry.

The invention belongs to the technical field of synthesis of fine chemical intermediates, and particularly relates to a continuous flow synthesis method and device of 2-methylbenzoquinone. The method comprises the following steps: a) dissolving 2-methylphenol and a Schiff base cobalt catalyst in an organic solvent to prepare a raw material solution; b) conveying the raw material liquid to a microreactor by using a pump, mixing the raw material liquid with oxygen or air in the conveying process, and then carrying out continuous oxidation reaction under certain reaction conditions to generate 2-methylbenzoquinone; and c) separating and purifying the reaction product to obtain the 2-methylbenzoquinone product.The micro-channel reactor is adopted to strengthen mass transfer and reduce the safety risk, the Schiff base cobalt is used as the catalyst, air or oxygen is used as the oxidizing agent, the reaction efficiency and yield are improved, pollution is reduced, and efficient, green and safe production is achieved.

According to the method, an enamine intermediate (2Z)-4-oxo-4-[3-(trifluoromethyl)-5, 6-dihydro-[1, 2, 4] triazolo [4, 3-a] pyrazine-7 (8H)-yl]-1-(2, 4, 5-trifluorophenyl) butyl-2-ene-2-amine is used as an initial raw material, and the Sitagliptin is synthesized through synergistic catalysis asymmetric hydrogenation of a cobalt catalyst and a chiral ligand. The R-configuration sitagliptin is prepared by one step, the reaction yield and stereoselectivity are high, the catalytic reaction effect is good, the cost is low, and the method is suitable for industrial large-scale production.

The invention provides a nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production as well as a preparation method and application of the nickel-iron-cobalt catalyst. The preparation method of the nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production comprises the following steps: S1, dissolving nickel salt in water to obtain a nickel-containing solution, dissolving iron salt in water to obtain an iron-containing solution, dissolving cobalt salt in water to obtain a cobalt-containing solution, and dissolving sodium borohydride in water to obtain a sodium borohydride solution; s2, uniformly mixing the nickel-containing solution, the iron-containing solution and the cobalt-containing solution to obtain a mixed solution; s3, mixing and stirring the mixed solution and a sodium borohydride solution to generate a large amount of precipitate, and further cleaning, drying and grinding the precipitate to obtain the nickel-cobalt-iron oxygen evolution catalyst. The nickel-iron-cobalt catalyst provided by the invention can replace an iridium oxide (ruthenium) catalyst. The catalyst has low overpotential when applied to AEM water electrolysis hydrogen production, long-time effective electrolytic reaction can be guaranteed, and meanwhile the cost of an AEM electrolytic cell is remarkably reduced.

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.

There are many benefits to organometallic catalysis, especially in homogeneous catalysis for C(sp2)-H bond activation and new C-C bond formation reactions. These catalysts, which are mainly transition metal complexes with organic ligands, are very reactive and selective, which increases the range and effectiveness of different synthetic transformations. Their capacity to activate C-H bonds under mild reaction conditions is a key advantage as it allows for the direct C-H alkylation of aryl ketones without the need for transient functional groups. This reduces utilization of chemicals, cost and energy used in addition to streamlining synthetic routes. Furthermore, complex molecular architectures with high stereo- and regioselectivity may be formed with the help of organometallic homogenous catalysts, making precise synthesis of complex molecules possible. The present catalyst is easy to use, industrially scalable, recyclable, and provides excellent yields of C-H alkylated products from nonactivated alkyl halides. The reported methods need the use of excess (2-6 equivalent) of alkyl halides but this catalyst performs the catalytic reaction in the stoichiometric quantities of aryl ketone and alkyl halides.

The application provides a cobalt phosphide water electrolysis catalyst and a preparation method thereof, and the preparation method comprises the following steps: (1) soaking foam nickel in a polyvinylpyrrolidone solution, and obtaining modified foam nickel after reaction; (2) mixing a cobalt nitrate hexahydrate solution and a 2-methylimidazole solution to obtain a mixed solution, adding the modified foam nickel into the mixed solution, and obtaining a metal organic framework ZIF-67@foam nickel material after reaction; (3) carrying out a separated gas phosphorization reaction on the metal organic framework ZIF-67@foam nickel material under a nitrogen atmosphere, and obtaining the cobalt phosphide water electrolysis catalyst. The cobalt phosphide catalyst prepared in the application has a high specific surface area and porosity, is beneficial to the exposure of active sites, and has excellent water electrolysis catalytic performance.

The application provides a method for constructing a planar chiral [2,2] paracyclophane by cobalt-catalyzed asymmetric carbon-hydrogen bond activation-kinetic resolution, which comprises the following steps: under the condition of direct current electrolysis, using a cobalt catalyst, a chiral ligand and an additive, taking a graphite felt electrode as an anode and a platinum electrode as a cathode, and allowing a racemic [2,2] paracyclophane formamide to undergo asymmetric carbon-hydrogen bond dehydrogenation coupling / kinetic resolution with an aryl acid, and after the reaction is completed, corresponding post-treatment is performed to obtain a planar chiral [2,2] paracyclophane formamide and a planar chiral oxo para-[2,2] paracyclophane. The application realizes electrochemical synthesis of the planar chiral oxo para-[2,2] paracyclophane by the method of crust-abundant transition metal catalyzed asymmetric carbon-hydrogen bond activation, the reaction substrate has wide universality, the stereoselectivity is excellent, and the product and the split-recovered raw material have excellent ee value (up to >99% ee) and a split factor (up to 1057).

The present invention relates to a zinc-air battery catalyst, a preparation method, and a recyclable, pulverization-resistant air electrode structure, belonging to the technical field of zinc-air battery electrode materials. The present invention relates to a process for adsorbing a magnetic metal-doped catalyst with a magnetic binder. The magnet-controlled zinc-air battery can achieve a long cycle life and address the issue of electrode pulverization. Furthermore, magnetic separation technology can be used to recover spent cobalt catalyst. The recovered catalyst can continue to operate stably in a cycle.

The invention relates to a method for preparing ester compounds with large steric hindrance based on a hydrocarbonylation reaction of olefin. Comprising the following steps: in an inert gas atmosphere, mixing a cobalt catalyst, a photosensitizer, Bronsted acid, olefin, alcohol or phenol and a solvent, putting the mixture into a high-pressure reaction kettle with a visible glass window, then carrying out light irradiation reaction in a carbon monoxide gas atmosphere, and carrying out column chromatography purification to obtain the large-steric-hindrance ester compound. The raw materials used in the method are cheap and easy to obtain, the experimental steps are easy to operate, the reaction conditions are mild, the method has good functional group compatibility and high regioselectivity, an efficient method is provided for synthesis of large-steric-hindrance ester compounds, and the method has wide industrial application prospects.

TITLE: Cobalt-containing catalyst composition for the synthesis of carbon nanotubes The present invention relates to an enhanced activity catalyst composition for the synthesis of carbon nanotubes and processes for obtaining these catalysts, as well as the carbon nanotubes obtained by the use of these catalysts.