17 results about "Sodium metaborate" patented technology

The invention belongs to the technical field of organic synthesis, and particularly relates to a pyroxasulfone preparation method which specifically comprises the following steps: dissolving 3-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5, 5-dimethyl-2-isoxazoline serving as a raw material with a solvent, then adding a boron compound, finally dropwise adding hydrogen peroxide, and reacting at room temperature to obtain the pyroxasulfone. Reacting for several hours to obtain pyroxasulfone; the adopted boron compound is cheap and easy to obtain, so that the use of a transition metal catalyst is avoided, and the raw material cost is reduced; organic acid reagents with heavy odor are not used, waste water and solid waste are less, and the method has great advantages in the aspect of environmental protection; the method is simple to operate, free of complex treatment steps and suitable for industrial production, and when the boron compound is selected from sodium metaborate, sodium perborate or a mixture of borax and sodium metaborate, the yield and purity of the process are higher, and sulfoxide impurities are fewer.

The present invention discloses N + Ion-modified α-PbO porous electrode, preparation method thereof, and application in electrocatalytic synthesis of sodium borohydride. The preparation process of the porous electrode is as follows: β-PbO powder is first ball-milled, and then stirred with a N-containing cationic surfactant solution to form N on the surface of α-PbO. + Modification, mixing with sodium metaborate, conductive powder and paraffin, grinding, tableting, embedding in alumina and sintering, the preparation is completed. + Modification can improve the double electric layer structure of the catalytic electrode surface and promote the reaction of B(OH)4 ‑ At the same time, the modified catalyst surface is easy to form Pb-N-O bonds, which enhances the adsorption of OH and helps activate the reactants on the catalyst surface. + The ion-modified α-PbO porous electrode has high efficiency in the solid-phase electrolysis synthesis of sodium borohydride. The current efficiency of the electroreduction synthesis of sodium borohydride in alkaline sodium metaborate solution can reach above 67.6%.

The invention relates to the technical field of sodium borohydride preparation, in particular to a sodium borohydride preparation method based on concentration and crystallization treatment. Comprising the following steps: adding crude sodium borohydride and deionized water into a high-pressure kettle according to a mass ratio, stirring, and filtering to obtain extract liquor; pumping the extract liquor into a reverse osmosis system, and carrying out membrane concentration; the concentrated solution is transferred to a crystallization kettle, polyethylene glycol-4000 is added, gradient cooling is executed for crystallization, and in the second stage of gradient cooling, sodium borohydride seed crystals are added, and meanwhile ultrasonic waves are applied for auxiliary crystallization; pumping the crystallized slurry into a horizontal centrifugal machine, separating crystals, putting the obtained crystals into a double-cone rotary drying machine, and drying to obtain concentrated sodium borohydride crystals; a traditional evaporation process is replaced by reverse osmosis membrane low-temperature concentration, by-product sodium metaborate impurity pollution is eradicated, the source of the phenomenon that metal ions induce dendritic crystal growth is eliminated, high-purity sodium borohydride crystals can be obtained through single crystallization, and the product yield is increased.

This invention relates to the field of sodium borohydride preparation technology, specifically to a method for preparing sodium borohydride based on concentration and crystallization. The method includes: adding crude sodium borohydride and deionized water to a high-pressure reactor in a specific mass ratio, stirring, and filtering to obtain an extract; pumping the extract into a reverse osmosis system for membrane concentration; transferring the concentrate to a crystallization reactor, adding polyethylene glycol-4000, and performing gradient cooling for crystallization, wherein sodium borohydride seed crystals are added in the second stage of gradient cooling while ultrasound is applied to assist crystallization; pumping the crystallized slurry into a horizontal centrifuge to separate the crystals, and placing the obtained crystals in a double-cone rotary dryer for drying to obtain concentrated sodium borohydride crystals; replacing the traditional evaporation process with low-temperature concentration via reverse osmosis membranes eliminates the byproduct sodium metaborate impurity contamination, removes the root cause of metal ion-induced dendrite growth, and allows for the acquisition of high-purity sodium borohydride crystals in a single crystallization, thus improving product yield.

The invention provides a method for determining the content of precious metal elements in an automobile purification catalyst, and belongs to the technical field of analysis and detection. According to the method, a composite melting system composed of sodium peroxide, anhydrous sodium metaborate and sodium tungstate is constructed, an automobile purification catalyst sample is subjected to efficient melting decomposition, complete leaching of a melt is achieved in combination with a hydrochloric acid and tartaric acid composite acidification system, a tin-tellurium coprecipitation enrichment technology is introduced on the basis, and the purity of the automobile purification catalyst sample is improved. Trace precious metal elements such as platinum, palladium and rhodium are selectively precipitated and effectively enriched, and matrix interference is remarkably reduced; and then adding an indium internal standard solution and carrying out quantitative determination by adopting inductively coupled plasma emission spectrometry, thereby realizing high-sensitivity and high-accuracy analysis of the noble metal element. The method effectively solves the problems of incomplete sample decomposition, low precious metal recovery rate, serious matrix interference, poor detection result stability and the like in the prior art.

The application belongs to the technical field of hydrogen storage material catalytic regeneration, and particularly relates to a PbO-M / copper hydrogen storage catalyst, a preparation method thereof and application of the PbO-M / copper hydrogen storage catalyst in electro-synthesis of sodium borohydride. The PbO active substance with high selectivity for the reaction of synthesizing sodium borohydride by electro-reducing sodium metaborate is synthesized on a copper carrier. The M component (Fe, Co, Ni) is added to the PbO-M / copper hydrogen storage catalyst, and the high hydrogen evolution activity of the M component is used to provide an additional active hydrogen source for the electro-reduction reaction, so that the selectivity of the PbO-M / copper hydrogen storage catalyst for the electro-reduction of sodium metaborate is further improved in a controllable manner, and the reaction rate of synthesizing sodium borohydride by electro-reducing sodium metaborate is improved. The PbO-M / copper hydrogen storage catalyst provided by the application is stable in performance in a long-term electro-catalysis process, and has high electro-reduction selectivity.

The present application relates to the technical field of pseudo-boehmite preparation, and particularly relates to a production method of pseudo-boehmite seed and pseudo-boehmite micro powder, and specifically comprises the following steps: (1) preparing pseudo-boehmite seed: adding water and pseudo-boehmite fine powder into a seed reaction kettle to make a slurry, controlling the flow of sodium metaborate and nitric acid and the reaction temperature, and preparing a pseudo-boehmite seed slurry; (2) preparing pseudo-boehmite micro powder: adding the pseudo-boehmite seed into a synthesis reaction kettle according to a proportion to prepare a pseudo-boehmite micro powder slurry; (3) filtering and washing the pseudo-boehmite slurry: filtering and countercurrent washing the pseudo-boehmite slurry; and (4) drying the product: flash drying the filter cake to obtain the pseudo-boehmite micro powder. The pseudo-boehmite micro powder has the following characteristics: (1) high purity: the purity is greater than or equal to 99%, the sodium oxide is less than or equal to 0.05%, and the iron oxide is less than or equal to 0.03%; (2) fine and uniform particle size: D 50 ≤2 microns, and D 90 ≤4 microns; and (3) the slurry of the pseudo-boehmite is in a mortar state, has good filtering performance, and is easy to be industrialized.

This invention provides a zirconium-doped sodium metaborate-coated cathode material and its preparation method. The preparation method includes the following steps: co-precipitation to prepare a zirconium-doped nickel-cobalt-manganese hydroxide precursor; mixing a lithium source with the zirconium-doped nickel-cobalt-manganese hydroxide precursor and sintering in an oxygen-containing atmosphere to obtain a zirconium-doped nickel-cobalt-manganese cathode material; dispersing the zirconium-doped nickel-cobalt-manganese cathode material in a sodium metaborate precursor solution, evaporating the solvent to allow the sodium metaborate precursor to adhere to the surface of the zirconium-doped nickel-cobalt-manganese cathode material; and heat-treating in an oxygen-containing atmosphere to obtain the zirconium-doped sodium metaborate-coated cathode material. This invention improves the electrochemical performance of the zirconium-doped sodium metaborate-coated cathode material through Zr bulk doping and sodium metaborate surface coating, and the preparation method is simple and easy to scale up for industrial production.

The invention provides a ternary material precursor and a preparation method thereof, a ternary material and a lithium ion battery, and the preparation method comprises the following steps: under a protective atmosphere, a mixed metal salt solution comprising a nickel salt, a cobalt salt and a manganese salt, an additive solution, a precipitator solution and a complexing agent solution are introduced into a base solution in a parallel flow manner, and a co-precipitation reaction is carried out to obtain the ternary material precursor. Preparing to obtain the ternary material precursor; the additive solution comprises a sodium metaborate solution and a sodium tetraborate solution. According to the preparation method disclosed by the invention, the additive solution comprising the sodium metaborate solution and the sodium tetraborate solution is introduced in the coprecipitation process, so that the sulfur content in the prepared ternary material precursor can be effectively reduced, and the reaction stability is improved.

The invention discloses a sodium borohydride hydrolysis hydrogen production device and method, and relates to the technical field of hydrolysis hydrogen production device.The sodium borohydride hydrolysis hydrogen production device comprises a reaction kettle body, a feeding mechanism is arranged in the reaction kettle body, a cleaning mechanism is arranged above the reaction kettle body, and the feeding mechanism can convey a catalyst into the reaction kettle body; the cleaning mechanism comprises a filtering unit, the filtering unit is arranged above the reaction kettle body, the filtering unit can filter crystal substances in the reaction kettle body, the cleaning mechanism comprises a scraping unit, the scraping unit is arranged in an inner cavity of the reaction kettle body, and the scraping unit can scrape down the crystal substances condensed on the inner wall of the reaction kettle body. According to the sodium borohydride hydrolysis hydrogen production device and the sodium borohydride hydrolysis hydrogen production method, by arranging the feeding mechanism, the filtering unit and the scraping unit, the problem that when equipment is used, sodium metaborate generated by chemical reaction in the reaction kettle body can reduce the reaction efficiency can be effectively avoided.

The application relates to the technical field of new materials, and discloses a mesoporous silica material with a hollow polyhedral structure, which has a polyhedral structure, a size of 200-300 nm, a polyhedral structure, and a hollow structure inside; the mesoporous silica material is prepared by carrying out a reaction in an emulsion system, taking hexadecyl trimethyl ammonium bromide as a structure directing agent, taking ethyl silicate as a silicon source, taking sodium hydroxide as a catalyst, taking sodium metaborate as a structure regulating agent, and then carrying out a reaction under heating and stirring conditions and then hydrothermal aging; the mesoporous silica material provided by the application has a particle size of about 200-300 nm, has a polyhedral structure, and has a hollow structure inside. The mesoporous silica material provided by the application has superhigh adsorption performance and excellent biological compatibility, can be used in the fields of daily chemicals and biological medicines, and can be used for substance adsorption, drug carriers and the like.

This invention belongs to the field of catalyst remediation technology, specifically relating to a method for reactivating a deactivated sodium borohydride hydrolysis catalyst for hydrogen production. In this invention, using an alkaline solution as the electrolyte on an electrochemical workstation, constant-voltage DC electrolysis is employed in a three-electrode system to effectively electrolytically reduce sodium metaborate, a hydrolysis byproduct remaining on the surface of the deactivated sodium borohydride hydrolysis catalyst, to water-soluble sodium borohydride. This effectively removes the sodium metaborate, which facilitates the re-exposure of active sites covered by sodium metaborate, thereby restoring the performance of the deactivated sodium borohydride hydrolysis catalyst to a reusable state. The reactivation method of this invention is characterized by mild conditions, minimal disruption to the original structure of the sodium borohydride hydrolysis catalyst, and a stable and controllable process, making it highly suitable for supported deactivated sodium borohydride hydrolysis catalysts.

The invention discloses a biomass-based hard carbon material with a closed-pore structure optimized by a boron-based template agent, a preparation method of the biomass-based hard carbon material and application of the biomass-based hard carbon material in a sodium-ion battery. The preparation method comprises the following steps: (1) carrying out solid-liquid mixing on biomass and an aqueous solution of a boron template agent, and drying; the selected boron template agent comprises at least one of boric acid, borax, triethyl borate, trimethyl borate, metaboric acid, sodium metaborate and potassium borate. And (2) carbonizing the dried mixed material twice, naturally cooling, pickling, and removing the template to leave a rich pore structure. And performing high-temperature re-carbonization on the carbon material, cooling, and sequentially performing crushing, acid pickling, water washing and drying. The obtained biomass-based hard carbon material has a pore structure with a large specific surface area and closed pore volume, the defect density of a graphite structure is reduced to slow down sodium death caused by an SEI film, and more pore-filled sodium storage sites are provided, so that the first coulombic efficiency and sodium storage performance of a battery are improved.

The application discloses a shell structure solid-phase catalytic electrode and a preparation method thereof and application of the shell structure solid-phase catalytic electrode in electrochemical synthesis of sodium borohydride. The shell structure solid-phase catalytic electrode is divided into an electrode inner core and an electrode outer shell body. A coating of the electrode inner core comprises sodium metaborate, a catalyst and a binder. A coating of the electrode outer shell body comprises the catalyst and the binder. The shell structure solid-phase catalytic electrode is prepared by combining the electrode inner core and the electrode outer shell body, and the shell structure solid-phase catalytic electrode solves the problem of low reaction efficiency caused by large migration resistance of anions to a cathode in a liquid-phase electrolysis method. The shell structure solid-phase catalytic electrode is used for electrochemical reduction of sodium metaborate to synthesize sodium borohydride, has low cost and high efficiency, and the current efficiency of the electrochemical reduction of sodium borohydride in an alkaline aqueous solution can reach more than 60%.

The invention belongs to the technical field of catalytic regeneration of hydrogen storage materials, and particularly relates to a PbO-M / copper hydrogen storage catalyst, a preparation method thereof and application of the PbO-M / copper hydrogen storage catalyst in electro-synthesis of sodium borohydride. According to the invention, a PbO active substance with high selectivity on a reaction for synthesizing sodium borohydride by electrically reducing sodium metaborate is synthesized on a copper carrier; according to the PbO-M / copper hydrogen storage catalyst, M components (Fe, Co and Ni) are added into the PbO-M / copper hydrogen storage catalyst, an additional active hydrogen source is provided for an electroreduction reaction by utilizing the high hydrogen evolution activity of the M components, and the selectivity of the PbO-M / copper hydrogen storage catalyst on electroreduction of sodium metaborate is controllably further improved, so that the reaction rate of synthesizing sodium borohydride by electroreduction of sodium metaborate is improved; the PbO-M / copper hydrogen storage catalyst provided by the invention is stable in performance and high in electroreduction selectivity in a long-term electrocatalysis process.

This invention provides a lithium-free low-temperature sintering aid, its preparation method, and its application, belonging to the field of ceramic production technology. First, sodium tetraborate decahydrate, sodium metaborate tetrahydrate, and rare earth oxides are mixed and sintered to prepare a first sintering aid. Then, the first aid is mixed and sintered with raw materials such as quartz to obtain a lithium-free low-temperature sintering aid. The lithium-free low-temperature sintering aid prepared by this invention is used to prepare low-temperature sintered ceramic green bodies. It can promote the reaction, thereby lowering the sintering temperature of the ceramic; simultaneously, it promotes the crystallization of the ceramic, resulting in smaller and more uniform crystal sizes, thus improving the mechanical properties of the ceramic; and it promotes the particle dispersion of the ceramic, resulting in higher sintering density of the ceramic material.

The application provides a system and a process for electrochemically capturing CO2, the system comprising an acid battery, an alkali battery, an electrolyte storage device and a vacuum stripper; the acid battery comprises a PbCl2 positive electrode and a Sb negative electrode, the alkali battery comprises a SbOCl positive electrode and a Pb negative electrode, the electrolyte storage device comprises a CO2 gas inlet, and the vacuum stripper comprises a CO2 gas outlet; the electrolyte storage device is filled with an electrolyte comprising sodium metaborate and choline chloride, and the electrolyte storage device, the acid battery, the vacuum stripper and the alkali battery are connected in series to form a circulation loop; after the electrolyte flows out of the electrolyte storage device, it flows back to the electrolyte storage device after passing through the acid battery, the vacuum stripper and the alkali battery. The application is based on the principle of a primary battery, and can capture CO2 in the atmosphere by using a small potential difference without the need for expensive membranes or chemical addition, is easy to implement, does not cause the formation of by-products, has low energy consumption, high electronic efficiency, and has a good application prospect.