7 results about "Sodium metaborate" patented technology

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 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 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 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 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.