11 results about "Cerium hydroxide" patented technology

According to the preparation method, cerium hydroxide with positive charges and without charge treatment on the surface is subjected to ultrasonic oscillation, so that a polymer or monomer containing negative charges and cerium hydroxide particles form coordinate bonds, first layer coating on the surface is realized, and surface charges are reversed into negative charges. Coating for the second time, adding a polymer with weak positive charges, polymerizing ion pairs through charge attraction, realizing secondary charge reversal and changing into positive charges. The invention discloses a method for repeatedly coating the surface of a cerium hydroxide particle, the electrical property of the coated cerium hydroxide particle is not changed, and the defect, namely particle adhesion, generated by mechanical force in the polishing process can be greatly reduced, so that the yield of a product is improved.

An object of the present invention is to provide a coating agent composition which forms a coating layer having high transparency, superhydrophilicity, and an antifouling function or an antifogging function even in a low temperature atmosphere. Another object of the present invention is to provide a method for producing the coating agent composition. Still another object of the present invention is to provide a product having a coating layer using the coating agent.SOLUTION: A method for producing a coating agent composition, comprising the steps of: (A) allowing a polymer obtained by polymerizing a silicic acid alkoxide to coexist with cerium hydroxide and / or cerium oxide to obtain an intermediate composition; and (B) allowing the intermediate composition obtained in the step (A) to coexist with acidic colloidal silica to obtain a coating agent composition.SELECTED DRAWING: None

In the present invention, positively charged cerium hydroxide particles without undergoing surface charge treatment are subjected to ultrasonic agitation, so that a negatively charged polymer or monomer and the cerium hydroxide particles form a coordination bond, thereby forming a first surface coating layer and reversing the surface charge into a negative charge; and in a second coating step, a weakly positively charged polymer is added, so that by means of charge attraction, a polymeric ion pair is formed, thereby achieving a second charge reversal to a positive charge. Disclosed in the present invention is a method for multiple surface coatings of cerium hydroxide particles. The coated cerium hydroxide particles do not change the intrinsic electrical properties thereof, and can greatly reduce defects caused by mechanical forces during polishing, such as particle adhesion, thereby improving the product yield.

This invention discloses an online monitoring and intelligent control system for the precipitation reaction process of high-purity cerium hydroxide, belonging to the field of reaction process monitoring and control technology. It includes: a dual-parameter tracing module for the precipitation process, a local oxidation feature capture module, a multi-signal decoupling identification module, and a zoned dynamic compensation execution module. The signals of each module are connected to a PLC control unit. In terms of precise oxidation control, this invention uses the local oxidation feature capture module to monitor dissolved oxygen and ORP values ​​in real time in four high-oxidation-risk areas, including the feeding mixing zone and the eddy shear zone. Combined with the time-series matching algorithm of the multi-signal decoupling identification module, it can accurately distinguish between precipitation disturbances, feeding disturbances, and oxidation disturbances, achieving high accuracy and low false triggering rate. The accompanying zoned dynamic compensation execution module's graded directional pulse deoxygenation strategy reduces inert gas consumption compared to continuous full-reactor aeration, while also avoiding air entrainment problems caused by continuous bubbling.

The application discloses a preparation method of a metal / cerium dioxide monatomic catalyst, which comprises the following steps: mixing an inorganic alkali solution and a cerium nitrate solution to perform hydrolysis, and then performing centrifugation, washing and drying to obtain Ce(OH)3; uniformly dispersing the Ce(OH)3 in a metal salt solution, and then performing stirring, centrifugation, washing and freeze-drying to obtain a metal precursor / cerium hydroxide; and performing a decomposition reaction on the cerium hydroxide under an inert gas to obtain a metal monatomic / cerium dioxide. 3+ The Ce on the surface of the cerium dioxide in the process is subjected to electron transfer with the adsorbed metal ions, and the metal ions are reduced; and then the metal / cerium dioxide monatomic catalyst is obtained by placing in air. The cerium dioxide is used as a carrier precursor, the metal monatomic is in-situ loaded on the cerium dioxide nanostructure through the electron transfer effect between the cerium dioxide and the metal ions, and a reducing agent is not additionally added, so that the preparation process is simple and mild, and the method has good controllability and industrial application prospect.

The application discloses a preparation method of a cerium hydroxide / nickel phosphide heterostructure catalyst for seawater electrolysis, and belongs to the technical fields of catalysts and batteries. Foam nickel is soaked in an aqueous solution containing nickel nitrate, urea and ammonium fluoride to perform a hydrothermal reaction, the foam nickel after the hydrothermal reaction is washed, dried, and Ni(OH)2 is obtained; a phosphorus source and the Ni(OH)2 are subjected to a phosphorization reaction under an inert atmosphere to obtain Ni2P nanometer arrays; the phosphorus source is sodium hypophosphite; cerium nitrate is added to distilled water, stirred and dissolved at normal temperature to obtain an A solution; the Ni2P nanometer arrays are used as a working electrode, soaked in the A solution to perform an electrodeposition reaction, the reaction product is washed with deionized water, dried, and a cerium hydroxide / nickel phosphide nanometer array heterostructure oxygen evolution electrode material for seawater electrolysis is obtained. The application promotes the rearrangement of an electronic structure at a heterojunction, optimizes adsorption energy of an intermediate, and thus improves the water electrolysis catalytic efficiency, has a short preparation cycle, good controllability, and good stability in seawater.

The invention relates to the technical field of waste liquid treatment, in particular to a continuous process method for deeply removing lead from a rare earth chloride solution. The method solves the problems of hydrogen sulfide escape, sulfur ion residue, discontinuous process and the like in the traditional sulfide precipitation method. The method comprises the following steps: adjusting the pH value of a solution to remove thorium, and enabling the solution to sequentially pass through a first fixed bed reaction column filled with a surface activated porous reduced iron filler and a second trapping and polishing column filled with magnetic iron oxide trapping particles and titanium dioxide coating polishing particles under an anoxic condition to realize reduction precipitation and deep removal of lead; then, barium salt precipitation is used for removing radium, and cerium hydroxide wet glue is used for adsorbing co-precipitated residual radioactive elements; the process does not need to introduce sulfides, can realize whole-process continuous operation, and has the advantages of radioactive purification, high rare earth recovery rate and good process stability.

The present disclosure relates to a method for preparing an electrolytic hydrogen production diaphragm, wherein the method comprises: mixing inorganic oxidized particles, metal hydroxide, binder and pore-forming agent to obtain a mixed slurry; coating the mixed slurry on one side or both sides of a porous base film to obtain a nascent film; soaking the nascent film in an extraction liquid and then performing a drying treatment; wherein the porous base film comprises a metal mesh; the metal hydroxide comprises one or more of nickel hydroxide, nickel oxyhydroxide, zirconium hydroxide, cerium hydroxide and yttrium hydroxide. The method provided by the present disclosure effectively improves the temperature resistance and high-temperature dimensional stability of the electrolytic hydrogen production diaphragm prepared by the method, while effectively improving the affinity of the diaphragm to the electrolyte, reducing the diaphragm resistance. Using the electrolytic hydrogen production diaphragm provided by the present disclosure in an alkaline electrolytic hydrogen production device can realize the operation of the electrolytic hydrogen production device at a temperature above 110 DEG C, and effectively improve the electrolysis efficiency.

This invention provides an allergen reducing agent that exhibits excellent allergen reduction effects. [Solution] The allergen reducing agent of the present invention is characterized by containing at least one cerium compound, which is either cerium oxide or cerium hydroxide. Therefore, it exhibits an excellent allergen reducing effect through the action of at least one cerium compound, which is either cerium oxide or cerium hydroxide, and in particular, it exhibits excellent water resistance in its allergen reducing effect. Furthermore, the allergen reducing agent of the present invention exhibits an excellent allergen reducing effect without requiring light irradiation and exhibits an excellent allergen reducing effect even in the dark.

A process for the extraction of cerium from an aqueous solution comprising REE, the process comprising cycles of adjusting the pH of the aqueous solution to 5-5.5 by the addition of NaOH, and then adding H2O2 until a pH of 3-5.5 in order to precipitate Ce(OH)4; wherein the amount of H2O2 in the second and subsequent cycles allows the pH to be maintained in the range of 3-5.5; wherein the cycles are repeated until the total amount of NaOH added to the aqueous solution reaches from 90% to 115% of the stoichiometric amount to convert all the rare earths into their hydroxides; separating by filtration the precipitate comprising Ce(OH)4 to obtain an aqueous solution mainly comprising non-Ce REE; and recovering the non-Ce REE from the aqueous solution. And use of the non-Ce rare earth elements recovered by the process above for the preparation of an article of manufacture.

The invention discloses zirconia biological ceramic with high toughness and high low-temperature aging resistance and a preparation method of the zirconia biological ceramic, and belongs to the technical field of preparation of ceramic-based composite materials. The preparation method of the biological ceramic comprises the following steps: dipping a green body in a mixed solution of aluminum nitrate, cerous nitrate and magnesium nitrate under negative pressure, then taking out and soaking in ammonia water, reacting aluminum nitrate, cerous nitrate and magnesium nitrate with ammonia water to obtain aluminum hydroxide, cerium hydroxide and magnesium hydroxide, then calcining to obtain aluminum oxide, cerium oxide and magnesium oxide, and repeatedly dipping to obtain the biological ceramic. Green bodies with different thicknesses can be obtained; and sintering the green body to obtain the zirconium oxide biological ceramic. By adopting a precursor dipping method, pressure stress is formed on the zirconium oxide surface layer, so that the strength, the fracture toughness and the low-temperature aging resistance of the zirconium oxide ceramic are improved.