4results about How to "Skeleton structure is stable" patented technology

The invention relates to the technical field of catalyst preparation and discloses a skeleton type iron-based molecular sieve as well as a preparation method and application thereof. The method comprises the following steps: (1) in the presence of a solvent, pre-reacting an Fe source, an M source and a zeolite molecular sieve, and drying to obtain a precursor; (2) calcining the precursor at the temperature of 500 DEG C or above for the first time, and then performing thermal modification in a hydrogen-containing atmosphere to obtain Fe / M seed crystal; and (3) mixing the Fe / M seed crystal with a silicon source, an aluminum source and a template agent, carrying out hydrothermal treatment, separating, drying, and carrying out secondary calcination at 500 DEG C or above to obtain the skeleton type iron-based molecular sieve. Through the synergistic effect of a hydrogen reduction seed crystal method and specific auxiliary metal, the skeleton type iron-based molecular sieve catalyst which has the denitration efficiency of 87% or above at the high temperature of 650 DEG C and has excellent cycle stability and high-temperature hydrothermal stability is successfully prepared.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

The application discloses a kind of nitrogen-doped porous carbon spheres based on arginine and its preparation method and application, belong to sodium ion battery negative electrode material technical field.Preparation method includes the following steps: arginine and benzene dimethylaldehyde are added to reaction solvent, after being mixed uniformly, nitrogen-doped porous carbon sphere precursor is obtained by transferring to reaction kettle and carrying out solvothermal reaction;Nitrogen-doped porous carbon sphere precursor is carbonized at 650-850 DEG C under protective gas atmosphere to obtain nitrogen-doped porous carbon sphere.The nitrogen-containing polymer sphere obtained by the reaction of benzene dimethylaldehyde and arginine is used as carbon precursor in the application, and nitrogen-doped porous carbon sphere is obtained by one-step carbonization, which can be used as sodium ion battery negative electrode material and has excellent electrochemical sodium storage performance.

The application discloses a porphyrin framework polymer and a preparation method and application thereof. The porphyrin framework polymer takes tetra(5-bromothiophenyl) porphyrin as an intermediate, introduces a thiophene substituent at four meso positions of the porphyrin, and is synthesized through Stille coupling reaction with a thiophene tin reagent. The preparation process is mild, and the purification is simple. The obtained polymer has high electrolyte solution solubility and excellent electronic conductivity, effectively solves the technical problems that an organic small-molecule active material is easily dissolved and lost in an organic electrolyte, has poor conductivity and the like, and simultaneously significantly improves the ion transmission capacity of the material. The porphyrin framework polymer is used as a positive electrode active material, is matched with a metal sodium negative electrode and a NaPF6 carbonate electrolyte to assemble a battery, and the battery has a capacity attenuation of no more than 10% under a current of 10 A g ‑1 7000 cycles under a large current, has high specific capacity, excellent rate and long cycle performance, and is suitable for large-scale long-acting energy storage sodium ion batteries.