108 results about "Ate complex" patented technology

The invention discloses a preparation method and an application of an S and N co-doped small-nano-size high-entropy intermetallic compound. 2, 2 '-bithiophene is simultaneously used as a metal ligand and a sulfur source to be applied to synthesis of the high-entropy intermetallic compound, and sulfur atoms in the substance can form a complex with metal ions, so that a metal precursor can be uniformly and firmly distributed on the surface of a commercial carbon carrier, and formation of the high-entropy intermetallic compound in the subsequent annealing process is facilitated; the S and N co-doped high-entropy alloy intermetallic compound catalyst synthesized by the invention has excellent electrochemical performance in a fuel cell, and particularly has remarkable performance in the aspect of stability; wherein the mass activity of the S and N co-doped high-entropy alloy intermetallic compound PtCuNiCoFe / C-SN (PCNCF-SN) catalyst under the condition of 0.9 V (vs.RHE) reaches 2.7 A * mg <-1 > Pt, which is more than 12.3 times of that of commercial Pt / C; and in the aspect of stability, the mass activity can still be kept at 65% or above after 100000 circles of accelerated durability.

Disclosed is a method for removing heavy metal ions from a phosphoric acid containing stream, the method may include: adding a diluted solution of a dialkyldithiophosphate compound having an alkyl chain length ranging from 8 to 12 carbon atoms to the phosphoric acid containing stream to form a heavy metal ion complex; and separating the heavy metal ion complexes from the phosphoric acid containing stream.

The invention discloses a heat storage unit and an assembling method and application thereof. The heat storage unit comprises a metal heat storage shell and a phase change layer, a heat storage space in the metal heat storage shell is filled with the phase change layer, and a phase change material of the phase change layer comprises the following components: 85.0 wt.%-95.0 wt.% of a phase change base material, 1.0 wt.%-3.0 wt.% of a nucleating agent, 2.0 wt.%-4.0 wt.% of a thickening agent and 0.5 wt.%-2.0 wt.% of a corrosion inhibitor; the phase-change base material comprises one of saturated fatty acid, an alcohol compound or an inorganic phase-change base material; the corrosion inhibitor comprises at least one of a nitrogen-containing heterocyclic compound, an oxygen-containing heterocyclic compound, molybdate, chromate and tungstate. A phase change base material and a corrosion inhibitor are selected for combined use, the corrosion inhibitor dissociates and forms substances with negative charges such as BTA <->, MnO4 < 2-> and CrO4 < 2->, a metal shell is in contact with the phase change material to lose electrons to form metal ions with positive charges, and the metal ions are combined with the substances with negative charges such as BTA <->, MnO4 < 2-> and CrO4 < 2-> to generate a compact long-chain complex. Further contact between other corrosion ions and metal is inhibited, so that the purpose of corrosion prevention is achieved.

Some embodiments relate to precursors, including intermediate precursors, and related methods. To produce the intermediate precursor, a mixture of bis(arene) metal complexes is combined with a first arene. The mixture of bis(arene) metal complexes first arene is heated and then cooled. Upon cooling, the bis(first arene) metal complexes precipitate out of solution to produce the high purity intermediate precursor. To produce the precursor, the bis(first arene) metal complexes are contacted with a second arene to produce the high purity precursor.

The invention is suitable for the application field of electrolyte acidity determination, and provides a method for determining the acidity of an all-vanadium electrolyte based on a complexing mass difference method, and the method comprises the following steps: taking the all-vanadium electrolyte, and diluting the all-vanadium electrolyte into a pretreated all-vanadium electrolyte with the concentration of 0.05-0.1 mol / L; adding 1.5-2mL of a complexing masking reagent with the molar concentration of 1.5-2mol / L, weighing, and recording as M1; stirring and titrating, weighing and recording as M2; a quantitative determination method of mass difference is used for calculation, and the formula is {(M2-M1)-0.05} / A * C. In conclusion, a mass difference quantitative determination method is adopted, the vanadium complexing masking reagent is added, the adding amount and the pH value of the vanadium complexing masking reagent are controlled, a stable complex is formed through the complexing masking reagent, vanadium ions and impurity ions, the oxidation-reduction reaction and the precipitation reaction of the complex and sodium hydroxide are inhibited, and the accuracy of the acidity value of the all-vanadium electrolyte is improved.

The invention aims to provide a method for preparing micron-sized zinc metastannate by wet recovery of tin and zinc in electronic wastes and a synthetic method of 4-hydroxy-1-indanone, and belongs to the technical field of metal recycling. According to the method, amino coordination and carboxylic acid chelation are utilized, tin and zinc in the electronic waste are selectively leached out under the mild acidic condition, impurity metals such as iron and copper are retained in residues due to the difference of complexing constants, and metal ion grade separation (selectivity gt and 99%) is achieved. And then, through evaporation-crystallization regulation and control, the Sn-Zn complex is directionally reconstructed into micron-sized zinc metastannate. In indanone synthesis, micron-sized zinc metastannate forms a local protonic acid environment by adsorbing trace moisture in a reaction system, synchronously activates a C = N bond (Lewis acid site catalysis) of an imine substrate and stabilizes a cyclization transition state (hydrogen bond guiding effect), so that the activation energy of [4 + 1] cycloaddition reaction is reduced, reaction equilibrium is driven to move towards a product end, and the yield of indanone is increased. And quantitative conversion of indanone under mild conditions (the yield is 60%) is realized.

The present invention relates to a disulfonate compound, a preparation method thereof, an electrolyte, and an energy storage device. The disulfonate compound has an #imgabs0# structure and is applied as an additive to an energy storage device, so that a stable SEI film can be formed on the negative electrode surface of the energy storage device, which can inhibit the decomposition of the solvent in the electrolyte. Since a stable SEI film can be formed on the negative electrode surface, the insertion and deintercalation of lithium ions at low temperatures become smooth, thereby improving the low-temperature performance of the energy storage device. On the other hand, the sulfonate group in the disulfonate compound can coordinate with transition metal ions to form a complex, passivating the positive electrode surface, inhibiting the dissolution of positive electrode metal ions, and reducing the decomposition effect of high-oxidation active substances on the solvent, thereby improving the electrochemical performance of the energy storage device under high-temperature conditions. In the energy storage device, the disulfonate compound can inhibit the increase of DC internal resistance, thereby improving the high-temperature performance and low-temperature performance of the energy storage device.

The invention relates to a synthesis method of 5, 5-disubstituted 2-isoxazoline, according to the method, oxime of a formula (II) and a carbonyl compound of a formula (I) react in the presence of a boron trifluoride complex and in the presence of an optional organic solvent or no solvent, the reaction conditions are mild, and the product yield is high.

The invention discloses an SERS (Surface Enhanced Raman Scattering) probe for monitoring a redox reaction as well as a preparation method and application of the SERS probe. A metal complex TEPE-Au is prepared firstly, and the chemical structural formula of the metal complex TEPE-Au is shown as a formula I; the TEPE-Au complex has an obvious Raman characteristic peak in a silent zone, shows high sensitivity and high resolution, and can be used as a silent zone reporter molecule. After being prepared into an SERS probe, the SERS probe is combined with an SERS detection technology, so that the SERS probe can be used for monitoring redox reaction, can also be used for detecting the concentration or content of alkaline phosphatase, and has a good application prospect in the fields of biological detection, chemical detection or medical diagnosis and the like. And the formula I of the # imgabs0 # is shown in the specification.

The invention relates to a method for preparing a methyl propionate palladium complex through free coordination cage effect stabilization ethylene hydrogen esterification, which aims at the problem that central metal of the palladium complex for preparing methyl propionate through ethylene methyl esterification is easy to gather and inactivate, and utilizes the cage effect of a stabilizer to construct a cage network around the palladium complex; meanwhile, the free coordination effect is utilized to cooperate with a bidentate phosphine ligand, so that the formation of palladium black inactivation of an active component palladium is effectively slowed down, the stabilization time is maximally prolonged by 360 hours, the TOF value is as high as 20000 h <-1 >, and the selectivity is 100%. The hydrogen esterification reaction system comprises ethylene, CO, methanol, a stabilizer and a palladium complex catalyst; the palladium complex catalyst comprises palladium acetate, 1, 2-bis (di-tert-butylphosphinomethyl) benzene and an acid accelerant. According to the method, the stability of the palladium complex is greatly improved while high catalytic activity and selectivity of the reaction are guaranteed, the reaction condition is mild, the atom utilization rate is high, and the method has a good application prospect in the reaction for synthesizing methyl propionate through ethylene hydrogen esterification.

[Problem to be Solved] An object of the present invention is to provide a method of purifying a phosphorus compound, which method is capable of reducing the generation of a by-product during distillation.[Solution to Problem] The method of method of purifying a phosphorus compound according to the present invention includes the steps of: obtaining a mixture containing a specific phosphorus compound, a specific alkenyl phosphorus compound and a transition metal complex; and subjecting the resulting mixture to distillation after adding a Lewis acid to the mixture, to obtain a first distillate containing the specific phosphorus compound.

The invention provides a plating bath for preparing a titanium-based lead dioxide electrode through electro-deposition and a preparation method of the plating bath, and relates to the field of plating baths, and the plating bath comprises lead p-toluenesulfonate, p-toluenesulfonic acid, fluoride of alkali metal and a dopant. The titanium-based lead dioxide electrode plating bath selects lead p-toluenesulfonate as a main salt and p-toluenesulfonic acid as an acid source, on one hand, the p-toluenesulfonic acid has a weak complexing effect and can form a complex with lead ions in the plating bath, the polarization effect of electro-deposition is increased, the compactness of a lead dioxide electro-deposition layer is improved, and the electrode stability is improved; on the other hand, p-toluenesulfonic acid serving as a hydrophilic organic molecule containing a large-pi conjugated system can be adsorbed on the surface of a lead dioxide crystal, growth of the lead dioxide crystal is regulated and controlled, electrodeposition distortion and internal stress of a lead dioxide active layer are reduced, and the accelerated life of an electrode is prolonged; and meanwhile, the p-toluenesulfonic acid can promote the dominant growth of beta-PbO2 with high catalytic activity, and is beneficial to improving the electrocatalytic activity of the titanium-based lead dioxide electrode.

The present invention relates to catalyst composition for cyclic carbonate production from CO2 and epoxides under mild conditions, which can effectively catalyze the cyclic carbonate synthesis and provides good selectivity to cyclic carbonate, wherein said catalyst composition comprising:a) the metal complex as shown in structure (I):wherein,M represents transition metal atom;R1, R2, and R3 represent independent group selected from hydrogen atom, halogen atom, alkyl group, alkenyl group, alkynyl group, alkoxy group, amine group, phenyl group, benzyl group, cyclic hydrocarbon group comprising hetero atom, perfluoroalkyl group, or nitro group;R4 represents group selected from alkylene group, cycloalkylene group, or phenylene group;X represents group selected from hydrogen atom, acetate group, or triflate group; andb) the organic compound as the co-catalyst selected from compound containing nitrogen, compound of quaternary ammonium salts, or compound of iminium salts.

Metal complex containing a metal M and a ligand L coordinated to the metal M a , where L a exhibits a structure represented by formula 1a: where in Formula 1a The metal M is selected from a metal with a relative atomic mass of more than 40; Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different in each occurrence, selected from CR x ; Y1 to Y4, the same or different in each occurrence, are selected from CR y ; R x and R y, the same or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, a cyano group and combinations thereof; at least one of the X3 to X8 CR x is and R x Cyano is; at least one of Y2 and Y3 CR y is and R y F is; and neighboring substituents R x and R y They may be connected to form a ring.

The application provides a high-capacity long-cycle high-nickel positive electrode material and a preparation method thereof. The high-nickel positive electrode material is a compound shown in the following general formula: Li a Ni x Co y Mn z M 1‑x‑y‑z O2, M is selected from one or more of V, Ta, Nb, Sr, Mo, Mg, Al, Zr, Ti, Ca, La and W, 0.80<=a<=1.20, 0.6<=x<=1.0. The material can form an ion complex with lithium ions. When the compound is added to an aqueous solution, lithium ions can be complexed and then attached to the surface of the high-nickel positive electrode material, so that the excessive escape of lithium ions is prevented, the structural lithium loss of the material in the water washing process is minimized, and the high-nickel positive electrode material with the high-capacity characteristic is prepared.

This invention provides a novel powder and method for its use for the extraction and complexation of gold from sources containing this metal. The powder comprises an optimized combination of borax, sodium bicarbonate, and glycine as a triple buffer system, iodide ion as a leaching agent, a complementary combination of potassium persulfate and potassium monopersulfate (Oxone®) as an oxidant, and a copper salt as a catalyst for the oxidation-reduction cycle. In the proposed method, the powder is contacted with a solid gold-containing feed under mild alkaline conditions and ambient temperature to form a stable iodide-gold complex. This complex can be recovered to pure metallic gold through chemical or electrochemical reduction, and the leaching solution can be reused after recovery without loss of yield.

To provide a double fluoride composite capable of producing a dense molded article without using an auxiliary agent.SOLUTION: The complex fluoride composite has a core-shell structure of a core of a crystalline component or an amorphous component of a complex fluoride containing fluorine, an alkali metal element and a second metal element different from the alkali metal element, and a shell of an amorphous component or a crystalline component of a complex fluoride covering a part of the core, wherein the second metal element is at least one metal element selected from the group consisting of an alkaline earth metal element, aluminum, gallium, indium, zinc and yttrium.SELECTED DRAWING: Figure 1

The present invention discloses an SBA molecular sieve encapsulated with nano-metal atoms, its preparation method, and its application in the direct vapor-phase epoxidation of propylene. The preparation method comprises the following steps: 1) mixing SBA molecular sieve raw powder with a passivating agent for a first reaction, then mixing with an alkaline solution for a second reaction, filtering, washing, and mixing with a metal complex solution to obtain solution A, wherein the metal complex is selected from at least one of haloauric acid, haloauric acid salt, haloplatinic acid, haloplatinic acid salt, sodium chloropalladate, palladium trifluoroacetate, and sodium tetrabromopalladate; 2) mixing an organic template, water, an acid, and a silicon source to form a gel to obtain solution B; 3) mixing solutions A and B and performing hydrothermal crystallization, filtering, washing, drying, and calcining. In the molecular sieve prepared by this method, the nanoparticles are all located in the molecular sieve pores, thereby improving the catalytic performance of the catalyst. During the direct vapor-phase epoxidation of propylene, the catalyst exhibits excellent propylene oxide selectivity.

The invention belongs to the technical field of fuel cell cathode reaction oxygen reduction electrocatalysts, and particularly relates to a preparation method and application of an Agx / Co3-xO4 compound. Cobalt salt and silver salt are used as metal sources, citric acid is used as a complexing agent, a rheological phase reaction is adopted, a precursor complex is prepared through the steps of drying, foaming and the like, and then the electrocatalyst is prepared through muffle furnace heat treatment. A rheological phase method is used for promoting complexing of metal salt and citric acid. A small amount of reducing carbon generated during high-temperature pyrolysis of citric acid enables Ag < + > which should be doped in Co position in Co3O4 to be synchronously reduced into elemental Ag instead of being doped in crystal lattices, so that the Agx / Co3-xO4 compound with a special structure is obtained. Compared with a uniform mixture of common elementary substance Ag and Co3O4, the Agx / Co3-xO4 compound similar to in-situ growth prepared by the method has better ORR catalytic activity, and is expected to provide a new thought for preparing other metal element compounds, so that the requirement of energy equipment on a high-performance ORR electrocatalyst is met.

High purity precursor compositions and related methods are provided herein. The method includes obtaining a metal complex and a reagent. The method includes contacting the metal complex and the reagent to form a reaction product. The reaction product has a purity of at least 85% as determined by a thermogravimetric analysis (TGA) residue at 300° C. The reaction product can be used as a deposition precursor.

Disclosed is a biphenol metal complex. The structure thereof is as represented by formula I, wherein R1 and R1′ are each independently selected from hydrogen and a substituted or unsubstituted C1-C20 hydrocarbyl; R3-R7, R3′-R7′ are each independently selected from hydrogen and a substituted or unsubstituted C1-C20 hydrocarbyl, any two adjacent groups of R3-R7 are optionally linked to form a ring, and any two adjacent groups of R3′-R7′ are also optionally linked to form a ring; M and M′ are each independently selected from the Group 4 metals; each X is independently selected from the group consisting of a hydrocarbyl having 1 to 20 carbon atoms, hydride, amido, alkoxide, alkyl sulfide, alkyl phosphide, halide, diene, amine, phosphine, ether, and combinations thereof; m and n are independently an integer of from 1 to 4; and L is a divalent linking group.

The purpose of the present invention is to provide a metal complex with which a target gas, especially carbon dioxide, can be separated and recovered from a mixed gas with higher energy efficiency than conventional materials. The metal complex is composed of: a dianion of an aromatic 1,3-dicarboxylic acid compound; a metal dication selected from magnesium, calcium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, copper, zinc and cadmium; and an organic bidentate ligand having a bispyridylethylene structure, and has a structure including two-dimensional sheets stacked in mutual engagement.

The present invention discloses a doped and modified lithium nickel cobalt manganese oxide single crystal positive electrode material and a preparation method thereof, the preparation method comprising: preparing an alkaline solution containing a doped ion compound as a base liquid for preparing a precursor and placing it in a reaction device, then adding a solution containing nickel salt, cobalt salt, manganese salt, an ammonia solution and a precipitant solution into a continuously stirred reaction device for chemical coprecipitation reaction, and after the reaction is completed, aging, centrifuging, washing and drying to obtain a doped nickel cobalt manganese oxide precursor; wherein the doped ion compound is a complex formed by citric acid and doped ions, a complex formed by sulfonic acid and doped ions, or a mixture of one or two, and the doped ion compound used is a nano-sized compound; the doped nickel cobalt manganese oxide precursor is mixed with a lithium salt, ball milled and sintered to obtain the doped and modified lithium nickel cobalt manganese oxide single crystal positive electrode material. The preparation method of the present invention can reduce costs, increase production capacity, and the prepared positive electrode material has high capacity and good cycle performance.

The invention discloses a soil treatment process which comprises the following treatment steps: (1) putting soil into a reaction tank I, introducing an EDTA (Ethylene Diamine Tetraacetic Acid) aqueous solution into the reaction tank I, and carrying out complexation reaction on heavy metal ions in the soil and EDTA to generate an EDTA heavy metal complex; (2) after the soil and the EDTA aqueous solution are stirred, the soil and the EDTA aqueous solution are discharged into a filter tank together; (3) discharging the EDTA aqueous solution from the filter tank to a liquid accumulation tank; (4) introducing a sodium sulfide solution into the liquid accumulation tank, reacting sodium sulfide with the EDTA heavy metal complex to generate a precipitate of heavy metal sulfide, and separating EDTA from heavy metal ions; (5) introducing reactants in the liquid accumulation pool into a container tank, and separating the precipitate of the heavy metal sulfide from the liquid by the container tank through filtration; (6) introducing the liquid in the step (5) into a reaction tank II, adding hydrochloric acid and hydrogen peroxide into the reaction tank II, and reacting to remove excessive sodium sulfide; and (7) introducing the DETA aqueous solution in the reaction tank II into the reaction tank I through a pipeline. According to the soil treatment process provided by the invention, the EDTA solution is recycled, and the process cost is reduced.

The present invention provides a reaction method for enhancing the removal of heavy metal complexes and the directional recovery of heavy metals in wastewater through pulsed voltage, belonging to the field of electrochemical technology. The reaction method comprises the following steps: The reaction method uses two electrochemical workstations and a reactor containing a first cathode, a second cathode, an anode, and a reference electrode; when one electrochemical workstation provides a pulsed voltage to the first cathode or the second cathode, the other electrochemical workstation provides a constant voltage to the remaining cathode; during the reaction process, air or oxygen is continuously introduced into the reaction solution in the reactor. The dual-cathode electro-Fenton-like system proposed by the present invention does not require the addition of Fe 2+ or any chemical reagent, and the oxidant H2O2 is in-situ generated by the reduction of dissolved oxygen at the cathode, and the activation of H2O2 is induced by the intermediate products electro-oxidized and degraded at the anode - low coordination number heavy metal complexes or ionic heavy metals.

The present invention relates to the field of rare earth production, and specifically discloses a method for producing crystalline cerium oxyfluoride by leaching bastnaesite, comprising the following steps: (1) taking oxidatively roasted bastnaesite and leaching it with an acid low-temperature wet method to obtain a rare earth leaching solution containing tetravalent cerium and a fluorine complex; (2) adding clean water to the rare earth leaching solution obtained in step (1) to dilute the rare earth leaching solution, so that Ce 4+ With F ‑ The formed complex hydrolyzes to form Ce(OH) x F y The crystalline cerium fluoride oxide is obtained by crystal precipitation, solid-liquid separation and calcination. The invention can make the rare earth leaching rate reach more than 92%, the yield of valuable elements praseodymium and neodymium is more than 95%, and the CeO2 / REO in cerium fluoride oxide is more than 95%; the method of the invention is simple, the consumption of chemical materials is low, and the fluorine, praseodymium and neodymium and cerium fluoride products in fluorocarbon cerium ore can be recovered at low cost, with significant economic and environmental benefits, and the method is more in line with market demand and enterprise needs.

Provided is an immobilized zinc complex comprising at least: a compound represented by general formula (1) (where R1 and R2 each represent a monovalent hydrocarbon group, R3 represents a divalent hydrocarbon group, R4 to R7 each represent a hydrogen atom or monovalent hydrocarbon group, R4 and R5, R6 and R7, or R4 and R6 may be combined with each other to form a ring, and n represents an integer of 0-2); a zinc halide represented by general formula (2) ZnX2 (where X represents a halogen atom); and an inorganic carrier, wherein silicon atoms, in the zinc complex having a guanidine ligand, in which a nitrogen atom in the compound represented by general formula (1) and a zinc atom in the zinc halide are bonded via a coordinate bond, are immobilized via covalent bonds with oxygen atoms on the surface of the inorganic carrier. The immobilized zinc complex can provide a cyclic carbonate compound at a good yield under mild conditions such as ambient pressure and / or room temperature conditions, and can be easily recovered and reused after the reaction.

The invention discloses a preparation method of a carboxamide triazole intermediate, which comprises the following steps: reacting (4-bromo-3, 5-dichlorophenyl) oxy) (tert-butyl) dimethylsilane with p-chlorobenzoyl chloride under the catalysis of a metal organic magnesium lithium complex, and removing a hydroxyl protecting group to obtain the carboxamide triazole intermediate. The activity of the metal organic magnesium lithium complex is far lower than that of the butyl lithium, the safety is higher, the whole reaction does not need to be carried out at an ultralow temperature, and the activity of the metal organic magnesium lithium complex is lower, so that small impurities generated by coupling are much less than those generated by using the butyl lithium; and when hydrochloric acid is used for deprotection, the purity of the product in the reaction liquid is increased by nearly 10%, the purification difficulty is greatly reduced, and the product yield is increased. The (4-bromo-3, 5-dichlorophenyl) oxy) (tert-butyl) dimethylsilane can also be obtained through self-preparation, the whole process route is simple, the reaction raw materials are easy to obtain, the synthesis cost is low, the reaction conditions are mild, and the safety is high.

The invention discloses a rare earth doped aluminate nanocrystal capable of emitting light in a near-infrared second region through ultrasonic excitation as well as a preparation method and application of the rare earth doped aluminate nanocrystal. The preparation method comprises the following steps: mixing an alkaline earth metal ion compound, an aluminum ion compound, a rare earth ion compound and a polydentate ligand in water for complex reaction to prepare a metal ion chelate precursor; performing high-temperature solid-phase thermal decomposition reaction on the metal ion chelate precursor, performing surface fat-soluble molecular modification in a thermal solvent, and performing surface hydrophilization modification by adopting an amphiphilic polymer to prepare the rare earth doped aluminate nanocrystal capable of emitting near-infrared second region by ultrasonic excitation. The rare earth doped aluminate nanocrystal is prepared by adopting an amorphous complex high-temperature solid-phase thermal decomposition method, the reaction condition is controllable, the operation is simple, the repeatability is good, the used reagent is cheap and easy to obtain, the rare earth doped aluminate nanocrystal has the property of ultrasonic excitation near-infrared second-region luminescence, and the wavelength can be adjusted within 900-2500 nm.