377 results about "Large pore" patented technology

The invention provides a preparation method for preparing porous carbon based on an aerogel method, the porous carbon and application of the porous carbon, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: mixing polyhydroxy phenol, aromatic aldehyde, acrylamide, graphene oxide and lithium salt according to a mass ratio of 100: (50-200): (5-30): (1-5): (1-5), carrying out hydrothermal reaction at 100-200 DEG C for 1-6 hours, and freeze-drying at-40 DEG C to obtain a hydrogel precursor; and carbonizing the precursor in organic heteroatom gas at 500-800 DEG C, mixing the intermediate with alkali according to the ratio of 100: (100-500), activating at 900-1100 DEG C, pickling and drying to obtain the porous carbon. The conductivity of the product is improved by means of graphene, lithium salt and heteroatoms, and the aerogel method obtains large aperture, has the characteristics of low impedance, high first efficiency and small charge-discharge expansion, and can be efficiently applied to silicon-carbon materials.

The invention belongs to the technical field of carbon dioxide trapping, and particularly relates to a silicon dioxide-based adsorbing material as well as a preparation method and application thereof. The silica-based adsorption material provided by the invention comprises a matrix and polyethyleneimine loaded in the matrix, the matrix comprises silicon dioxide; the structure of the silicon dioxide-based adsorption material is a honeycomb cylindrical body; the silica-based adsorption material has a uniformly distributed pore structure, and the pore volume of the silica-based adsorption material is 0.08-0.36 cm < 3 > / g. The silica-based adsorption material provided by the invention has relatively large pore volume and relatively high amine loading capacity, and is beneficial to adsorption of carbon dioxide; meanwhile, the honeycomb structure is adopted, air can be guided to uniformly flow along the channels, pressure drop is reduced, the contact area with the air is increased, and adsorption of carbon dioxide is facilitated. The mechanical strength of the silicon dioxide-based adsorption material is improved by the uniformly distributed pore structure, and the industrial requirements can be met.

The invention relates to a method for synthesizing mesitylene by gas-phase non-hydroisomerization of unsym-trimethylbenzene, which comprises the following step of: contacting the unsym-trimethylbenzene with a catalyst under a gas-phase non-hydroisomerization reaction condition in the presence of the catalyst, wherein the catalyst is an EWT structure molecular sieve, the total pore volume of the EWT structure molecular sieve is 0.20-0.51 cm < 3 >. G <-1 >, and the mesoporous volume is 0.11-0.37 cm < 3 >. G <-1 >. According to the method disclosed by the invention, the EWT structure molecular sieve with an ultra-large pore channel structure is adopted as the catalyst, and when the catalyst is used for synthesizing mesitylene through unsym-trimethylbenzene gas-phase non-hydroisomerization, the distribution conditions of raw materials and products are improved, the conversion rate of unsym-trimethylbenzene and the selectivity and the mass yield of mesitylene are improved, heavy component carbon deposition is slowed down, and the yield of mesitylene is improved. The service life of the catalyst is prolonged.

The invention provides a battery diaphragm and application, and relates to the technical field of secondary batteries. Specifically, the battery diaphragm comprises a base membrane and a coating loaded on at least one side of the base membrane, the coating comprises first ceramic and second ceramic, the first ceramic is filled in the coating, the second ceramic comprises first particles filled in the coating and second particles embedded in the coating, and the number ratio of the second particles to the first particles is 1.2-4.0. The coated diaphragm disclosed by the invention can be used for a cylindrical battery cell, has good heat resistance, thickness consistency, conductivity and electrolyte wettability, can enable the diaphragm and an electrode plate to have larger pores after being wound, improves the electrolyte injection efficiency, provides a space to release the stress of the electrode plate, is not easy to separate out lithium, and can be applied to the field of lithium ion batteries. And the cycle performance and the capacity retentivity of the secondary battery can be obviously improved.

The invention provides an aerogel film with a continuous gradient pore structure and a preparation method and application thereof.The preparation method comprises the steps that a pre-crosslinking solution containing a polymer nanofiber suspension, a sodium alginate solution, a polyethyleneimine aqueous solution and a crosslinking agent is sprayed to a temperature-conducting substrate with the initial temperature ranging from-20 DEG C to-15 DEG C at high pressure; and freeze-drying to obtain the aerogel film with the continuous gradient pore structure. The aperture of the aerogel film is gradually increased from bottom to top, and the range of the aperture is mainly 1-110 [mu] m. The aerogel film is placed in a filter membrane clamp, so that a solution to be filtered passes through the aerogel film according to the sequence of'macropore-mesopore-micropore ', the aerogel film is used for intercepting and recycling particles with different sizes, such as micro-plastics, and high water flux and high rejection rate are both considered. The pore size of the aerogel film can be changed by adjusting the temperature of the temperature-conducting substrate; the prepared aerogel film improves the trade-off effect in the existing filtration separation technology, and has a wide market prospect.

The invention relates to a preparation method of a low-density boride aerogel material, and aims to solve the problems of high density, large pore diameter and poor heat insulation performance of the existing boride ceramic material with a porous structure, the method comprises the following steps: 1) preparing tannic acid-formaldehyde sol, and pre-gelling at a constant temperature; 2) preparing M / B precursor sol, and carrying out pregelation at a constant temperature; 3) mixing the tannic acid-formaldehyde sol and the M / B precursor sol, and fully and uniformly stirring to obtain mixed sol; 4) sealing and storing the mixed sol at a constant temperature to obtain boride precursor wet gel; (5) carrying out absolute ethyl alcohol replacement on the boride precursor wet gel, and drying at normal pressure to obtain boride precursor aerogel; and 6) carrying out high-temperature sintering on the boride precursor aerogel in a tubular furnace to obtain the pure-phase boride aerogel. The low-density boride aerogel material with a complete structure can be obtained, the material phase purity is high, the density and aperture are adjustable, the light absorption performance is excellent, the maximum porosity is-95%, and the low-density boride aerogel material has wide application prospects in the field of thermal protection of aircrafts as a light thermal insulation material.

The invention provides a hydrogel hydrophilic modified gradient pore oil-water separation membrane as well as a preparation method and application thereof, and belongs to the technical field of separation membranes. The hydrogel hydrophilic modified gradient pore oil-water separation membrane comprises a base membrane with a porous structure and a hydrogel layer coated on a porous structure framework of the base membrane, and a gradient pore structure with a small pore diameter on one side and a large pore diameter on the other side is formed. The hydrogel hydrophilic modified gradient pore oil-water separation membrane prepared by the method has a super-hydrophilic and super-oleophobic surface and has excellent anti-fouling performance and oil interception performance, the gradually expanded pore diameter can provide large oil-water separation flux, emulsified oil with surface activity can be effectively treated, and the oil-water separation membrane has the advantages of high oil-water separation efficiency, high oil-water separation efficiency and the like. And excellent pollution resistance is maintained under different environmental conditions, and long-term stable operation is realized.

The invention relates to a calcium-based desulfurizer and a preparation method and application thereof, and relates to the technical field of desulfurizers, the calcium-based desulfurizer comprises a calcium-based carrier with a micropore-mesopore-macropore three-level pore structure, and a gamma-aminopropyltriethoxysilane modifier dispersed in pore channels, the molecular imprinting layer is modified by an inactive region on the inner wall of the mesoporous; the preparation method comprises the steps of calcium-based carrier pretreatment, composite pore forming, pre-roasting, hydroxyl strengthening and the like. The efficient mass transfer system is constructed through a three-stage pore structure, the modifier and the molecular imprinting layer synergistically improve the structural stability and the sulfur dioxide adsorption selectivity, the calcium base utilization rate and the desulfurization efficiency are improved, and the industrial flue gas desulfurization requirement is met.

The invention provides a negative electrode plate and a preparation method and application thereof, the negative electrode plate comprises a negative electrode active layer, the negative electrode active layer comprises a silicon carbon material, the silicon carbon material comprises macroporous, mesoporous and microporous channels, and the channels are filled with a solid electrolyte; the solid electrolyte comprises a solid electrolyte material and silicon dioxide, and at least part of the silicon dioxide and the solid electrolyte material are bonded through covalent bonds. According to the negative plate, through the special structural design, the silicon carbon material and the solid electrolyte are cooperatively matched, so that the rate capability and the cycle performance of the battery are effectively improved.

The invention relates to the technical field of diapers, in particular to an antibacterial diaper and a preparation process thereof. The antibacterial diaper comprises a skin-friendly layer, an impermeable layer, a core layer and a leakage-proof bottom layer from inside to outside. And the skin-friendly layer is an antibacterial non-woven fabric. The impermeable layer is a one-way permeable membrane and is densely provided with a plurality of water guide holes, and the aperture of one side, facing the skin-friendly layer, of each water guide hole is larger than that of one side, facing the core layer, of each water guide hole. The core layer comprises a flow guide medium and high-molecular water-absorbent resin which are compounded with each other. The leakage-proof bottom layer comprises a breathable microporous membrane and a non-woven fabric which are attached to each other. The skin-friendly layer of the baby diaper is made of the antibacterial non-woven fabric, and compared with the skin-friendly layer of some baby diapers made of common non-woven fabric, the antibacterial non-woven fabric has the advantages that the antibacterial effect is improved, the reproduction of bacteria can be inhibited, and the health of babies can be protected. According to the water guide holes of the impermeable layer, water easily enters the water guide holes from the large-aperture side, is attracted by the flow guide medium on the other side and is finally absorbed by the high-molecular water-absorbent resin, and the water does not easily penetrate through the small holes and returns to the large-aperture side, so that liquid is prevented from back seepage.

This invention discloses a catalytic cracking co-catalyst with high resistance to thermal abrasion, comprising a molecular sieve, a matrix, a binder, and a binder modifier. The molecular sieve has an MFI structure, and the molecular sieve with a pore diameter less than 0.7 nm accounts for 50 wt% to 100 wt% of the total molecular sieve. The matrix is ​​composed of a γ-alumina precursor with a colloidal index ≤ 50% and clay. The binder is prepared from phosphorus-containing and aluminum-containing compounds. The raw materials for the binder modifier include multi-chelate ligands, precursors of at least two coordination metals, alcohols, and organic acids. The binder, binder modifier, and matrix are all mixed in a high-shear emulsifier. Compared with existing catalytic cracking co-catalysts for propylene and octane number, the catalytic cracking co-catalyst provided by this invention has higher resistance to thermal abrasion, larger pore volume, and higher molecular sieve content.

The present invention relates to a high-voltage anodization method and an aluminum substrate anodized thereby and, more specifically, to a high-voltage anodization method using a phosphoric acid solution as an electrolyte, which enables stable anodization while applying a high voltage without causing a burning phenomenon on the surface of the aluminum substrate, and an aluminum substrate anodized thereby. The high-voltage anodization method according to the present invention improves a voltage ramping process in anodizing using phosphoric acid so that a high voltage of 190 V or higher can be applied while preventing surface burning of the aluminum substrate, thereby enabling stable anodization of the aluminum substrate. In addition, an anodized membrane manufactured using the aluminum substrate produced by the high-voltage anodization method of the present invention can stably form a hexagonal nanostructure having large pores of 150 nm or greater.

The invention discloses a graphene-containing carrier material, a negative pressure container containing the same and used for storing electronic gas, and a use method and a preparation method of the graphene-containing carrier material. The negative pressure container comprises a bottle body, a valve and a carrier material filled in the bottle body, and the carrier material comprises graphene. By utilizing the characteristics that the selected carrier material has a relatively high specific surface area and a relatively large pore volume, the whole negative pressure container is filled with the carrier material so as to load and unload electronic gases including arsine, phosphorane, boron trifluoride and the like, and excellent loading capacity and unloading capacity are shown; the product type of the negative pressure container capable of containing the electronic gas is expanded, and the benign development of the negative pressure container market is guaranteed.

The invention relates to the technical field of preparation of polycaprolactone porous membranes, in particular to a polycaprolactone porous membrane and a preparation method and application thereof.The polycaprolactone porous membrane is of a porous structure with macropores and small pores coexisting, the pore walls of the macropores and the small pores are all composed of polycaprolactone particles, and the polycaprolactone porous membrane is provided with pores with the pore walls composed of micron-sized particles. The polycaprolactone porous membrane is prepared from polycaprolactone, a composite hierarchical pore structure containing small pores in macropores is formed, a three-dimensional pore network internally communicated with one another is formed, the specific surface area is increased by the porous structure, the number of adhered cells is further increased, the interconnected porous structure allows cells to migrate into the polycaprolactone porous membrane, and meanwhile, the porous structure is convenient for conveying substances.

The application discloses a catalytic cracking catalyst with mesopore and macropore structures and a preparation method thereof. The catalytic cracking catalyst contains 15-60 wt% of molecular sieve, 5-40 wt% of first binder of large-grained pseudo-boehmite calculated based on alumina, 0-15 wt% of second binder and 20-80 wt% of clay based on dry weight. The large-grained pseudo-boehmite has a grain size of 6-10 nm. The total pore volume of the catalytic cracking catalyst is 0.4-0.5 mL / g. The preparation method comprises the following steps: preparing the first binder of large-grained pseudo-boehmite by a carbonization method, adding hydrochloric acid to gelatinize the large-grained pseudo-boehmite, adding the clay, the molecular sieve and the second binder, spray-drying and molding, calcining, washing and drying. The large-grained pseudo-boehmite is prepared by the following steps: neutralizing sodium metaaluminate solution with carbon dioxide to form a gel, aging the slurry by gradually increasing the temperature in stages after the gel is formed, filtering the slurry, continuously washing and drying after the aging. The catalytic cracking catalyst has good abrasion performance while retaining the mesopore and macropore structures. When applied to a catalytic cracking process, the catalytic cracking catalyst can significantly improve heavy oil conversion rate, reduce coke formation and optimize product distribution.

The application belongs to the field of catalytic device manufacturing and relates to a porous metal plate with a multi-peak pore structure, a porosity of 20% to 80%, a pore size distribution curve obtained by a mercury injection method having at least two peaks, a first peak P1 and a second peak P2 in the range of 1 mu m to 120 mu m, a valley bottom between the first peak P1 and the second peak P2, a pore size corresponding to the position of the valley bottom being X mu m, X being between 15 and 40, the first peak P1 being in the range of 1 mu m to X mu m, the second peak P2 being in the range of greater than X mu m and less than or equal to 120 mu m, the first peak P1 corresponding to small pores, the second peak P2 corresponding to large pores, a small pore pore size being 1 mu m to X mu m, a large pore pore size being greater than X mu m and less than or equal to 120 mu m, and a small pore to large pore volume ratio being 1:1.5 to 1:7. The porous metal plate has a multi-peak pore structure distribution, is suitable for hydrogen production by electrolysis of water, can realize efficient transmission of reactants, improve a contact area of the porous metal plate and a catalytic layer, reduce a contact resistance, and improve a utilization rate of a catalyst.

The application belongs to the technical field of membrane materials, and particularly relates to a method for preparing a Janus membrane hydrophobic layer from modified hydrophobic polymer nanofibers. The method uses secondary deep exfoliation to obtain single-layer high-fluorinated graphene oxide nanosheets, which are used as hydrophobic polymer additives in the preparation of the hydrophobic layer in the electrospinning process to induce the formation of uniform bead structures, promote the formation of finer nanofibers, more microspheres, and larger pore diameters. The Janus membrane prepared with the hydrophobic layer can significantly improve the permeation flux and / or oil-water separation efficiency in the oil-water separation process, and has excellent cycle stability.

This invention discloses a copper-based catalyst supported on macroporous alumina, its preparation, and its application. The macroporous alumina-supported copper-based catalyst comprises a macroporous alumina support and copper oxide and lanthanum oxide supported on its surface. The macroporous alumina-supported copper-based catalyst is particulate with a specific surface area of ​​250-500 μm. 2 / g, pore volume 1.0~2.0 cm³ 3 The copper-based catalyst supported on macroporous alumina has an average pore size of 16-30 nm. The content of each component in the catalyst, expressed as a mass percentage, is as follows: macroporous alumina support 79%-98.9%, copper oxide 0.1%-6%, and lanthanum oxide 1%-15%. The macroporous alumina-supported copper-based catalyst of this invention exhibits high catalytic activity and selectivity for higher alcohols in the ethanol-to-higher alcohol reaction, particularly showing higher selectivity for C6-C10 fatty alcohols.

The application discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, and the preparation method comprises the following steps: firstly, a nickel source, a molybdenum source and an aluminum source are smelted and crushed to obtain a Ni-Mo-Al ternary alloy powder; then, the Ni-Mo-Al ternary alloy powder is added into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to perform a dealuminization reaction; hydrogen bubbles generated in-situ by the reaction are used as soft templates, and the hydrophobic conductive micro powder is adsorbed on the bubble interface and assembled in the skeleton through Pickering effect; finally, the catalyst is obtained through washing and drying; the catalyst prepared by the application has a large pore structure with conductive micro powder distributed on the inner wall; the unique structure not only reduces the mass transfer resistance, constructs an electron transmission channel, but also promotes the discharge of product nitrogen through a local hydrophobic environment, and significantly improves the catalytic activity and nitrogen selectivity when treating nitrate-containing wastewater.

This invention discloses a method for hydrotreating catalytic cracking slurry. A fixed-bed hydrotreating process is employed, comprising: in the presence of hydrogen, the catalytic cracking slurry sequentially contacts a hydrotreating protectant, a hydrotreating transition catalyst, and a hydrodesulfurization catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrotreating protectant comprises an alumina support with a most probable pore size of 40–100 nm, molybdenum oxide, and cobalt oxide. The hydrotreating transition catalyst comprises an alumina support containing additives and MoO3 and CoO. The support has a bimodal pore size distribution, with smaller pores concentrated in the 10–40 nm range and larger pores concentrated in the 150–400 nm range. This method eliminates the diffusion resistance during the adsorption and reaction of large molecules on the catalyst surface during the hydrotreating of catalytic cracking slurry, increases the capacity for more deposits such as coke, extends the operating cycle of the unit, and facilitates hydrodesulfurization and other reactions. It also increases the content of tricyclic and tetracyclic aromatics in the hydrotreated oil, making it a high-quality feedstock for needle coke production.

The application discloses a kind of phosphoric acid group modified β-cyclodextrin-based polymer film microextraction coating material and its application.First, a kind of phosphoric acid group β-CD porous crosslinked polymer (DBP-β-BNCD) and its preparation method are provided.The DBP-β-BNCD has the advantages of large specific surface area, narrow pore size distribution, large pore volume, good thermal stability, etc., which is beneficial to the accessibility of adsorption sites.When adsorbing hydrophilic pollutants antibiotics, various adsorption mechanisms such as polarity interaction, hydrogen bond interaction and π-π interaction are introduced.Further, by using DBP-β-BNCD as a thin film solid phase microextraction coating material, a method combining TFME with high performance liquid chromatography-tandem mass spectrometry (HPLC-QqQ-MS) is established, and the results show that the coating material has great potential for the extraction of hydrophilic organic pollutants in the environment.

The application provides a alginate-based aerogel, a preparation method and application thereof. The alginate-based aerogel has parallelly arranged large pores and oriented channels at an angle with the large pores, and the angle ranges from 0 to 180 degrees. The large pores are distributed in the same direction inside the alginate-based aerogel, and the oriented channels improve the interconnectivity between the large pores. The existence of the large pores and the oriented channels makes the alginate-based aerogel have the characteristics of anisotropy and a multi-scale pore structure, and the size of the large pores and the oriented channels is suitable for inducing vascularization and osteogenesis. Therefore, the aerogel can be used as a bone scaffold material. Tests show that the aerogel has the characteristics of light weight and high strength. In addition, other components beneficial to osteogenesis can be added in the alginate system, and the size of the pores can be adjusted without affecting the formation of the pore structure.

The invention discloses an emulsified particle channeling sealing agent for CO2 flooding as well as a preparation method and application thereof, and belongs to the technical field of CO2 flooding of oil reservoirs. The emulsified particle channeling sealing agent for CO2 flooding comprises the following components in percentage by weight: 20-30% of matrix asphalt, 1.6-2% of latex, 0.8-1.2% of a softening agent, 3-5% of an emulsifier, 0.1-0.5% of a dispersing agent, 0.4-1.3% of a pH regulator and the balance of deionized water. The emulsified particle channeling blocking agent for CO2 flooding can effectively block deep cracks or large pore channels of a reservoir, enlarge the sweep efficiency of CO2 in an oil reservoir and improve the CO2 flooding recovery efficiency, has excellent temperature resistance, acid resistance and salt resistance, and is harmless to a reservoir matrix.

This invention discloses a thermal shock-induced catalytic electrode, its preparation method, and its application in wastewater treatment, belonging to the field of wastewater treatment technology. The catalytic electrode comprises a titanium metal substrate and a mixed metal oxide catalytic layer formed on the surface of the titanium metal substrate. The mixed metal oxide catalytic layer has a hydroxylation-rich surface, high specific surface area, and large pore volume, and its microstructure is a uniform mud-crack-like porous structure containing nanoscale grains. The preparation method includes first laser shock strengthening of the titanium metal substrate to form a mesoscale array structure; then loading the mixed metal oxide precursor using an immersion-pulling-space flow method; subsequently performing annealing; rapidly immersing the annealed electrode in a hydrogen peroxide solution for thermal shock quenching; and finally performing low-temperature tempering to eliminate internal stress and reduce resistance. The catalytic electrode of this invention achieves a balance between catalytic activity, conductivity, and stability, and its preparation process is simple and easy for large-scale industrial production.

The invention discloses a preparation method of through hole type resin, and belongs to the technical field of polymer resin materials. A ternary composite pore-foaming agent composed of toluene, n-heptane and polyethylene glycol (PEG) is adopted, the proportion of the ternary composite pore-foaming agent is optimized, and the through type resin is prepared through suspension polymerization and temperature programming curing. The resin prepared by the method has a highly through pore channel network, the penetration rate is not less than 50%, the resin also has appropriate large pore diameter and relatively high specific surface area and pore volume, meanwhile, the resin keeps good mechanical stability while obtaining an excellent penetration structure, the preparation process is good in repeatability, and the preparation method is suitable for industrial production. An ideal material is provided for the fields of high-performance adsorption separation, chromatographic analysis, catalysis and the like.

The present invention relates to a polymeric microparticle with dual size pores, and a preparation method therefor. The polymeric microparticle is formed by cross-linking at least partially cross-linkable oligomer materials, including rigid nanoparticles, wherein at least one of the rigid nanoparticles has a non-spherical shape in a solution. The polymeric microparticles have two sets of pores having distinctive sizes distributed inside, wherein the first set of pores are macropores larger in size, and the second set of pores are gel pores that are smaller in size and formed internal structural ordering at least in regions. While ensuring the ordering of molecules and pores of the original polymeric microparticles, the present invention allows for a second, larger pores within the polymeric microparticles, which can improve the permeability of the separation matrice, and thereby expanded the separation range of the polymeric microparticles in chromatographic analysis.

This utility model relates to the field of gas purification technology for C4 equipment, specifically, to a gas purification and filtration device for C4 equipment. The device includes a body of the C4 equipment with a slot on its back. A filter chamber is located within the inner cavity of the slot. A rear cover is snap-fitted to the top of the slot. The integrated design of the slot and filter chamber saves internal space in the C4 equipment and is suitable for compact environments. The device also includes a pull-out plate located within the filter chamber. A pretreatment screen is fixedly connected to the center of the pull-out plate. The pretreatment screen has large pores to intercept large particles in the gas, preventing clogging of the filtration equipment. The pull-out plate can be pulled, enabling multi-stage filtration and coordinated purification. The pretreatment screen intercepts large particles such as hair and debris, preventing clogging of the main filter element. The first and second filter screens achieve medium and high precision filtration respectively, improving gas filtration efficiency. The three-stage gradient filtration extends the filter element's lifespan.

The invention discloses a preparation method of a hard carbon negative electrode material for a high-capacity sodium battery. The hard carbon negative electrode material is prepared through carbonization purification, boron template agent mixing, profiling treatment and secondary high-temperature carbonization. A four-step synergistic process of purification, mixing, forming and carbonization is adopted, impurities are deeply removed through high-temperature carbonization, and impurity interference is reduced from the source; a boron-based template agent is utilized to regulate and control a microporous structure, internal gaps of a material are compressed by using a profiling process, so that hard carbon particles are in close contact with the template agent, finally, the internal graphitization degree of hard carbon is promoted to be improved through high-temperature secondary carbonization, meanwhile, a structure which takes amorphous form as a main component can be kept, and the sodium storage requirement is met; the boron-based template agent is partially decomposed to form gas to escape, mesopores with uniform sizes are formed in the hard carbon, the pore diameter of the mesopores is 2-5nm, an efficient channel is provided for sodium ion migration, sharp increase of the specific surface area caused by overlarge pore channels is avoided, and finally the balance of high capacity and high first efficiency is realized.

The application discloses a preparation method of a copper-zinc catalyst, which comprises the following steps: (1) a Zn and Cu-containing solution and a sodium metaaluminate solution are combined to carry out a gelation reaction to obtain a slurry; (2) the slurry obtained in the step (1) is continuously subjected to n times of third-stage pH value decreasing aging, 1 / n Al-containing solutions are added at the end of the first-stage pH value aging each time, and the material obtained after the aging is subjected to solid-liquid separation, the solid phase is subjected to first drying, tabletting and molding to obtain a molded material, and then the molded material is washed, subjected to second drying and calcination to obtain the copper-zinc catalyst. The catalyst prepared by the method has a large pore volume and pore diameter, and the stepwise pore distribution makes the active metal copper and the additive zinc have good dispersion performance and good synergistic effect, thereby improving the activity, selectivity and thermal stability of the copper-zinc catalyst and the service life of the catalyst.

The invention discloses a directional cultivation method for a sulfur autotrophic nitrogen removal filter material with a multi-gradient pore structure. The directional cultivation method specifically comprises the following steps: step 1, preparing raw materials; step 2, gradient mixing; thirdly, layered pressure forming is conducted; 4, controllable ablation hole forming is carried out; step 5, surface modification treatment; step 6, performance detection and optimization; 7, filter material application and effect evaluation; the nitrate nitrogen diffusion coefficient is increased by 35% and the reaction kinetic constant (k) reaches 0.23 h <-1 > through a three-stage pore system; the Zeta potential (-25mV) on the surface of the micropore promotes the adhesion of bacteria, and the forming time of a biological membrane is shortened by 30%; the solid deposition rate is reduced through the large-hole channel spacing design, and the operation cycle is prolonged to two times of that of a traditional filter material.