57 results about "Ammonium hexafluorophosphate" patented technology

The invention relates to a method for preparing an electrochemically assisted nitrogen and phosphorus double-doped carbon-based air electrode, belonging to the technical field of air electrodes. Pyrrole or the like is used as an electropolymerization nitrogen source, tetrabutylammonium hexafluorophosphate or the like is used as a phosphorus source and a supporting electrolyte, and the polymerization is carried out on a pretreated conductive carbon substrate through an electrochemical method. Finally, the nitrogen and phosphorus double-doped carbon-based air electrode is obtained through a subsequent calcination process. Nitrogen (one of sources) is uniformly distributed in a polymer form while phosphorus is impregnated in situ. The integrated electrode has a high specific surface area andgood catalytic performance and stability and can be used as a cathode catalyst applied in a metal air battery and has a wide range of practical applications.

The invention provides a preparation method of ammonium hexafluorophosphate. The preparation method includes: sequentially adding solid ammonium bifluoride, anhydrous hydrogen fluoride and phosphorusoxychloride into a reaction kettle to obtain primary reaction liquid, adding a certain amount of methanol into the reaction kettle to obtain secondary reaction liquid, dropwise adding ammonia water into the reaction kettle to obtain tertiary reaction liquid after sufficient reaction, performing solid-liquid separation on the tertiary reaction liquid to obtain precipitates and quaternary reaction liquid, transferring the quaternary reaction liquid into a concentrating kettle to perform vacuum concentration to obtain methanol gas and ammonium hexafluorophosphate mother liquor, and transferring the ammonium hexafluorophosphate mother liquor into a crystallizing kettle to perform cooling crystallization to obtain the finished-product ammonium hexafluorophosphate. The preparation method has theadvantages that the ammonium hexafluorophosphate is prepared by dissolving the ammonium bifluoride into the anhydrous hydrogen fluoride and dropwise adding the phosphorus oxychloride, the reaction iseasy to control, mild, gentle in speed and safe, operation difficulty is lowered, production cost is lowered at the same time, and production cycle is also shortened.

The invention discloses a surface-modified nano boron fiber / Mo-Zn-S-F composite material. A preparation method of the surface-modified nano boron fiber / Mo-Zn-S-F composite material comprises the following steps: S1, putting molybdenum chloride, zinc chloride, ammonium sulfide and ammonium hexafluorophosphate into a water bath reaction kettle, adding a reaction solvent, performing hydrothermal reaction at 180-220 DEG C for 15-20 hours, cooling to room temperature, performing suction filtration, washing with benzene for 3-5 times, then washing with water for 4-7 times, then washing with ethanolfor 5-8 times, drying the obtained product in a vacuum drying oven at the temperature of 60-80 DEG C for 6-8 hours, grinding, and sieving with a 200-300-mesh sieve to obtain Mo-Zn-S-F; S2, dispersingthe Mo-Zn-S-F and the nano boron fibers prepared in the step S1 into a high-boiling-point solvent, then adding polymethyltriethoxysilane modified epoxy resin into the high-boiling-point solvent, carrying out stirring reaction for 6-8 hours at the temperature of 60-80 DEG C, then carrying out precipitation and suction filtration in water, and washing for 3-5 times by using ethanol so as to obtain the surface modified nano boron fiber / Mo-Zn-S-F composite material. The wear-resistant packing prepared from the composite material has the advantages of mechanical property, wear resistance, high temperature resistance, good chemical stability and excellent sealing property.