4 results about "Cerium hydroxide" patented technology

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 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.