41 results about "Large pore size" patented technology

The application discloses a kind of linear cutting continuous processing methods of seat body large aperture parallel group hole, belong to mechanical manufacturing technical field.This method is first with seat body A face as reference, planing, planing seat body shape and concave surface to drawing size;Again, workpiece is once clamped and aligned, and linear cutting molybdenum wire is used along preset trajectory to continuously cut, and all large aperture through hole is simultaneously processed, and 45° chamfer bevel is reserved at cutting place;Finally, intermittent welding is used to cutting seam, and workpiece temperature is strictly controlled not to exceed 80 DEG C to prevent thermal deformation, and after welding, weld is ground flat to make surface flush with concave surface.The application is characterized by linear cutting without mechanical cutting force, solves the problem that tool is easily appeared in traditional boring machine processing, through hole taper is big, parallelism is poor, effectively guarantees the size and shape accuracy of through hole.Workpiece is only single clamping, and it is free from dependence on high-skilled operators, processing efficiency and product consistency are significantly improved, and it is suitable for batch processing of large-size seat body parallel deep hole of 45 steel.

This utility model relates to the field of laboratory wastewater treatment technology and discloses a laboratory wastewater discharge device with a filter anti-clogging structure, including a storage tank and a disassembly assembly. This laboratory wastewater discharge device with a filter anti-clogging structure, through the arrangement of a storage tank, connecting plate, first filter screen, second filter screen, and third filter screen, allows the wastewater to be filtered. First, the wastewater enters the filter tank through the feed hopper, then contacts the first filter screen. The larger pore size of the first filter screen initially intercepts larger impurities in the wastewater. Then, the smaller pore size of the second filter screen further filters out slightly smaller impurities. Finally, because the third filter screen has the smallest pore size, it intercepts even finer particles and colloidal substances in the wastewater, thereby filtering out solid impurities in the wastewater. This greatly improves the purity of the filtered wastewater, enabling the discharged wastewater to meet higher standards, reducing the load on subsequent wastewater treatment systems, and lowering the risk of environmental pollution.

The application discloses a preparation method of a high-stability cellulose nanofluid film, and a product and application thereof, and belongs to the field of energy conversion and material science. The method comprises the following steps: adding modified cellulose into an ionic liquid to prepare a solution by heating; dropping and coating the solution onto the surface of a porous polymer film, and preparing a gel film by heating and vacuum treatment; and obtaining the nanofluid film after water soaking and drying of the gel film. The nanofluid film adopts an embedded structure, the cellulose layer is a small-pore structure, the porous polymer film is a large-pore structure, and the nanofluid film has etching and three-dimensional network channel structures. The preparation process is simple and the conditions are mild, the prepared film has excellent ion rapid selective transmission performance, acid-base stability and long-term operation stability, can efficiently convert salinity gradient energy into electric energy, and has a good application prospect in the field of salt-difference osmotic energy utilization.

A lithium secondary battery with reduced Hi-pot defects and improved capacity retention rate. According to one aspect of the present disclosure, a lithium secondary battery includes an anode, a cathode, and a separator interposed between the anode and the cathode. The anode includes a Si-based anode active material. The separator includes a separator substrate having a plurality of pores and including a polyolefin resin. The polyolefin resin has a polydispersity index (PDI) of 2.5 to 4.2, an average pore size of 20 to 40 nm, and a maximum pore size of 50 nm or less.

The present application relates to the technical field of industrial solid waste utilization, and discloses a synthesis method of smelting fly ash-based mesoporous material, which uses smelting fly ash as a main raw material, uniformly mixes sodium carbonate and smelting fly ash at a specific ratio, and calcines at a suitable temperature, so as to destroy the difficult-to-dissolve glass phase and mullite phase in the smelting fly ash, make the smelting fly ash form a low-carbon cerchi stone phase which is easy to react with acid, and react with low-concentration hydrochloric acid, so as to prepare a mesoporous material with large specific surface area and pore volume and concentrated pore size distribution. The specific surface area of the best sample in the present application is 567.45 m2 / g, the pore volume is 0.95 cm3 / g, the most probable pore diameter is 18.30 nm, the Si / Al ratio is 3.65, and the yield is 44.59%. The preparation process of the method is simple, does not need to use expensive template agents, has high implementability and production safety in actual production, and realizes high-value utilization of smelting fly ash.

This invention relates to the field of high-purity aluminum and aluminum alloy production technology, and particularly to a porous alumina ceramic material, its preparation method, and its application. The material comprises a composite aggregate and an organic binder, wherein the mass ratio of the composite aggregate to the organic binder is 47:3. The composite aggregate comprises 9 wt%–17 wt% inorganic binder and 83 wt%–91 wt% aggregate particles. The inorganic binder comprises: 40 wt%–50 wt% B₂O₃, 20 wt%–29 wt% Al₂O₃, 10 wt%–15 wt% SiO₂, 9.4 wt%–14.4 wt% MgO, 0–0.5 wt% Na₂O, 0–0.5 wt% K₂O, and 0–10 wt% Re₂O₃, where Re is a rare earth element. This method uses corundum or α-Al₂O₃ as a framework and rare earth composite oxides as an inorganic binder. A high-temperature reaction forms sintering necks between the aggregate particles, resulting in a porous alumina ceramic with a bimodal pore distribution. Two different pore sizes are distributed in situ on the surface of the skeleton particles and the sintered neck, achieving a dual-capture filtration effect for aluminum molten inclusions. This solves the problem that filters with large pore sizes cannot simultaneously filter small-grain-sized impurities.

The porous membrane laminate of the present application has a support layer having porosity and a porous membrane laminated on one side of the support layer and having polytetrafluoroethylene as a main component, the porous membrane being a uniaxially stretched material, the average pore diameter of the porous membrane being 25 nm or more and 35 nm or less, the maximum pore diameter of the porous membrane being 49 nm or less, and the average thickness of the porous membrane being 0.6 μm or more and 3.5 μm or less.

This invention discloses a porous carbon-supported copper catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The invention uses three-dimensional interconnected ordered porous carbon (NCP) with a large-pore structure as a support, tetraphenylporphyrin copper(II) and tetraphenylporphyrin as nitrogen and copper sources, and KOH or NaOH as activators. An NCP precursor adsorbed with tetraphenylporphyrin copper(II), tetraphenylporphyrin, and an alkaline component is obtained through a two-step adsorption process. This precursor is then pyrolyzed at 600-900℃ under nitrogen protection, cooled to room temperature, and washed with water to obtain the porous carbon-supported copper catalyst (NCP@NC-Cu). This catalyst retains a three-dimensional interconnected porous structure, with the active component (copper species) mainly distributed within the pores of the NCP support, and possesses a large specific surface area and abundant nitrogen. The catalyst was applied to the N-formylation reaction of amines with CO2 and H2 to prepare formamide compounds, exhibiting excellent catalytic activity, recyclability, and good substrate versatility, showing promising application prospects.

The present application relates to a kind of based on jig small size copper block large aperture resin plug hole method, comprising the following steps: providing a jig plate, the thickness of the jig plate is greater than the thickness of copper block;At least one groove is machined on the jig plate, the planar dimension of the groove is greater than the planar dimension of copper block, and the depth of the groove is greater than or equal to the thickness of copper block;At least one air hole is machined on the bottom of the groove, and the air hole corresponds the position of copper block to be plugged;Copper block is placed in the groove;Resin plug hole processing is carried out on the jig plate after copper block is placed, and resin fills copper block to be plugged.The beneficial effects of the present application are that existing standard resin plug hole equipment can be used for processing, without purchasing special equipment, which greatly reduces the equipment threshold and processing cost.

This invention belongs to the field of petrochemical technology, specifically relating to a high-purity pseudoboehmite with concentrated pore size and its preparation method. The preparation method includes: mixing aluminum sulfate solution with ammonia water for a primary neutralization reaction; adding ammonia water and a pore-expanding agent to the resulting slurry for a secondary neutralization reaction; subsequently heating and allowing it to age; filtering, washing, drying, and pulverizing the aged product to obtain high-purity pseudoboehmite. The preparation method of this invention employs co-current and overflow neutralization, reducing the process flow and simplifying operation. It solves the problems of high synthesis cost, complex operation, and environmental pollution in existing pseudoboehmite synthesis methods. The generated byproduct, ammonium sulfate, has certain industrial application value. The pseudoboehmite obtained by this invention has the advantages of large specific surface area, large pore volume, and uniform and concentrated pore size distribution.

This invention discloses a hierarchical porous metal-based gas-liquid transport and diffusion component and its forming method. It includes a gradient porous support layer with pore size decreasing in a gradient direction from the fluid inlet side to the catalyst layer side (i.e., a large-pore, low-mesh metal mesh near the fluid inlet side and a small-pore, high-mesh metal mesh near the catalyst layer side). A transition layer is disposed on the high-mesh side surface of the gradient porous support layer, and the gradient porous support layer and the transition layer are an integrated structure. The component of this invention has low ohmic impedance and high mechanical strength. It achieves ordered transport and separation of the gas and liquid phases through the gradient porous structure, and promotes water wetting and bubble desorption with the capillary driving force generated by the transition layer. This solves the problem of mutual constraint between gas-liquid mass transfer and electron conduction in water electrolysis for hydrogen production, significantly reduces the operating voltage of the electrolyzer, simplifies the stack assembly process, and is suitable for high-efficiency electrochemical energy conversion device systems such as proton exchange membrane water electrolysis and fuel cells.

This invention provides a method for preparing and applying a catalyst for co-thermal pyrolysis of waste plastics and biomass, comprising the following steps: Step 1, mixing FCC waste catalyst, sodium carbonate, and a metal oxide precursor uniformly to form a powder; Step 2, modifying HZSM-5 molecular sieve with phosphorus; Step 3, mixing the mixture obtained in Step 1, the phosphorus-modified ZSM-5 molecular sieve from Step 2, a binder, and water to form microspheres, calcining to obtain the catalyst for co-thermal pyrolysis of waste plastics and biomass. The catalyst prepared by this invention has a large pore size and pore volume, and when used for co-thermal pyrolysis of waste plastics and biomass, the liquid yield is greater than 70%.

This invention discloses a supported nickel catalyst for the fixed-bed hydrogenation of 3-hydroxypropanol to 1,3-propanediol, its preparation method, and its application, relating to the field of catalyst technology. The catalyst of this invention uses a support with a large specific surface area and large pore size as the matrix. The active component, nickel, is highly dispersed and uniformly loaded onto the support surface using a precipitation-deposition method. A neutral or basic binder is selected during the catalyst forming stage, avoiding the pre-calcination step of the precipitated product. This results in a catalyst with both high hydrogenation activity and a certain cost advantage. The supported nickel catalyst prepared by this invention exhibits high catalytic activity and selectivity in the fixed-bed hydrogenation of 3-hydroxypropanol to 1,3-propanediol, and is suitable for the industrial continuous production of 1,3-propanediol.

The present application relates to the technical field of adsorbent, in particular to a porous material adsorbent and its preparation method and application. The preparation method comprises the following steps: (1) adding a ruthenium-containing substance and an organic peroxide into a first organic solvent to perform a first reaction, adding a crosslinking agent to perform a second reaction, and obtaining a precursor solution; (2) adding a second organic solvent into the precursor solution to mix, obtaining a ligand mixture; (3) adding graphene oxide into the ligand mixture to mix, obtaining an adsorbent slurry, performing solid-liquid separation, calcination and extrusion molding on the adsorbent slurry, and obtaining a porous material adsorbent. The prepared porous material adsorbent has a large specific surface area, a large pore size and a large pore volume, and has a high compressive strength. The porous material adsorbent is applied in the field of adsorption desulfurization, has a high total sulfur breakthrough sulfur capacity and a high tail gas outlet precision.

The application provides an alumina carrier and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, subjecting isobutene-maleic anhydride copolymer to an ammonolysis reaction; step 2, mixing the mixture obtained in step 1 with hydrated alumina; step 3, mixing the mixture obtained in step 2 with an aqueous crosslinking agent solution, shaping, drying, and calcining to obtain the alumina carrier. The preparation method is simple, low in cost, and friendly to the environment in the preparation process, and the prepared alumina carrier has a large pore size and pore volume and high mechanical strength. The prepared alumina carrier can be used for a residual oil hydroprocessing active protective agent and a hydrodemetallization catalyst.

The invention discloses a silicon oxide microsphere as well as a preparation method and application thereof. The silicon oxide microspheres are large-aperture silicon oxide microspheres, the specific surface area is 395-750m < 2 > / g, the pore volume is 1.0-3.5 ml / g, and the average aperture is 17-50nm. The silicon oxide microspheres have the characteristics of large specific surface area, large pore volume and large pore diameter, and the catalyst prepared by using the silicon oxide microspheres as the carrier has the advantage that the activity is remarkably improved when the catalyst is applied to olefin polymerization reaction.

The application discloses a supported catalyst and a preparation method and application thereof in hydrogen production by low-temperature methanol reforming, and belongs to the technical field of hydrogen production. The preparation method of the catalyst comprises the following steps: (1) dissolving cerium nitrate and zinc nitrate in deionized water, adding a template agent, stirring uniformly, adjusting pH to 8.0-9.0 by using lye, and performing hydrothermal reaction, and then performing washing, drying, calcination and reduction treatment to obtain a carrier rich in oxygen vacancies; (2) dissolving copper salt and auxiliary salt in deionized water, adding a complexing agent, stirring and dissolving, adjusting pH to 5.0-6.0 by using lye, adding the carrier rich in oxygen vacancies, and then performing impregnation, drying, calcination and reduction treatment to obtain the supported catalyst. The supported catalyst prepared by the application has the advantages of large specific surface area and large pore size, and exhibits excellent performances of high methanol conversion rate and low CO selectivity in the hydrogen production by low-temperature methanol reforming.

The application relates to the technical field of catalyst preparation, and particularly discloses a preparation method of a high-crosslinking polymer / SiO2 aerogel composite material and application thereof. A kind of aluminum-doped silica aerogel is synthesized by selecting solid waste coal gangue as a silicon source and adopting a sol-gel method. Further, in the presence of SiO2 aerogel, a high-crosslinking polymer is in-situ loaded through a Friedel-Crafts alkylation reaction to obtain a high-crosslinking polymer / SiO2 aerogel composite material. The prepared HCPs@SiO2 composite material has the characteristics of halogen-free, large specific surface area, wide pore size distribution and the like. As a halogen-free catalyst, the composite material exhibits excellent catalytic activity and cycle stability in the cycloaddition reaction of CO2 and epoxide, the environmental-friendly characteristics avoid the toxicity residue and corrosion risk of a traditional halogen-containing system, meanwhile, the product post-processing process is simplified, and the composite material shows significant potential in industrial-scale application.

This invention belongs to the field of soil microecology technology, specifically relating to a soil-grown mesh bag assembly for isolating roots and mycelia, and its preparation method. The mesh bag assembly includes large-pore, medium-pore, and small-pore mesh bags. The large-pore mesh bags are made of large-pore nylon mesh, the medium-pore mesh bags are made of medium-pore nylon mesh, and the small-pore mesh bags are made of hydrophilic composite filter membrane cloth. The sidewalls of the medium-pore and small-pore mesh bags are equipped with a composite sealing structure. This invention also provides a gradient isolation method for in-situ soil cultivation using this mesh bag assembly, and the corresponding preparation method. This invention, through multi-pore gradient design and a composite sealing structure, achieves selective physical isolation between roots and mycelia within the soil, highly restoring the in-situ microecological environment. It effectively solves technical problems such as root leakage during sewing and adhesive detachment, improving the effectiveness of experimental samples. It is suitable for in-situ cultivation research of various soil microecological systems and has broad scientific research application value.

This invention relates to the field of hydrocracking catalysts, and discloses a hydrocracking catalyst, its preparation method and application, and a method for hydrocracking treatment of residue oil. The hydrocracking catalyst contains molecular sieves, silicon-modified alumina, and active metal components. Optionally, the hydrocracking catalyst also contains alumina and / or additives. The content of the molecular sieve is 5-25 wt%, the content of the silicon-modified alumina is 30-60 wt%, and the content of the alumina is 0-20 wt%. The content of the active metal components, calculated as oxides, is 5-35 wt%, and the content of the additives, calculated as oxides, is 0-1.0 wt%. The catalyst provided by this invention has the advantages of large specific surface area, large pore volume, large pore size, and high metal content. When used in the hydrocracking treatment of residue oil, it not only exhibits high activity and good stability, but also improves naphtha selectivity, expands feedstock adaptability, and reduces hydrogen consumption.

The application discloses a modified large-aperture porous carbon preparation method and a product thereof, and relates to the technical field of battery material preparation; the application comprises the following steps: adding a water-soluble carbon source, a water-soluble activator, a water-soluble salt, a dispersing agent and a conductive agent solution into deionized water to configure a mixed solution, heating to perform a hydrothermal reaction, filtering after the reaction is completed, drying filter residues to obtain a hydrogel, pre-carbonizing and steam activating to obtain porous carbon, and laser etching to obtain large-aperture porous carbon; finally, a mixed gas of a heteroatomic gas and a carbon source gas is used to perform gas phase deposition modification on the surface of the large-aperture porous carbon to obtain a target product; the preparation method is simple and easy to control, the prepared modified large-aperture porous carbon has the advantages of good uniformity, few defects, large pore volume and low resistivity, and is beneficial to improving the electrochemical performance of a silicon-carbon battery.

The present application discloses a kind of diaphragm for water electrolytic cell and its manufacturing method, the diaphragm is formed by polyphenylene sulfide fiber containing woven fabric structure, the diaphragm has the through hole structure surrounded by the polyphenylene sulfide fiber inside, the porosity of the diaphragm is 61-75%, and the ratio of the maximum pore size and average pore size of the diaphragm is below 3.40.The diaphragm for water electrolytic cell of the present application has the characteristics of high air tightness, low resistance, good durability.

The application belongs to the field of fine chemicals and medicinal chemistry, and particularly relates to a catalyst for Claisen ester condensation and a preparation method and application thereof. The application improves the preparation method of alpha-ketoglutarate calcium, adopts cheaper and more easily obtained raw materials, and innovatively invents a guanidino-amino co-functional KIT-6 mesoporous silica (Gua-NH2@KIT-6) to catalyze the Claisen ester condensation reaction. The catalyst carrier obtained by the application has a large pore size (4-12 nm), a high specific surface area (>600 m 2 / g), a surface rich in silicon hydroxyl groups (-SiOH), is convenient for grafting organic bases, has good thermal / chemical stability, is simple to handle, is safe to operate, reduces water consumption, is completely free of metal residues, is not dissolved, can be separated by filtration, can be reused after simple washing, has a wide substrate application range, and is suitable for industrialization.

The present application relates to the field of powder injection molding, and particularly relates to a preparation method of refractory tungsten with uniform microporous structure. The preparation method mixes tungsten nanopowder with a binder to granulate, and then injection molds the treated powder to obtain a green body with uniform microporous structure; a sectional sintering method is used to pre-coarsen to control the uniformity of the structure and pores, and then further control the grain size and pore size, so that the prepared porous tungsten material has fine and uniformly distributed grain structure and pores, the porosity is 20%-50%, the average grain size is less than 1 mu m, the pore size is less than or equal to 0.5 mu m, and the variance is not more than 0.4. The method solves the problems of coarse grains, uneven pore size and pore distribution in the porous tungsten material prepared by the traditional method.

The objective of this invention is to provide a method for purifying a drug solution that yields a drug solution with excellent defect inhibition performance. The method of this invention uses two or more filters with different pore sizes to filter a substance containing an organic solvent to obtain a drug solution. In this method, the filter F with the largest pore size X1 among the two or more filters... max The supply pressure P1 of the purified substance and the filter F with the smallest pore size X2 among two or more filters. min The supply pressure P2 of the purified substance satisfies the following relationship: P1 > P2.

The application discloses a methanol steam hydrogen production catalyst and a preparation method and application thereof, and belongs to the hydrogen production technical field. The preparation method of the methanol steam hydrogen production catalyst comprises the following steps: (1) dissolving aluminum salt, copper salt and zinc salt in deionized water to obtain a mixed salt solution; stirring and uniformly mixing anhydrous ethanol solution of a surfactant, adjusting the pH value to 6.5-7.5 by using lye, standing and aging at room temperature, and obtaining a precursor through filtering, washing and drying; and (2) placing the precursor into a tube furnace to perform calcination, and obtaining the methanol steam hydrogen production catalyst. The methanol steam hydrogen production catalyst prepared by the application has a relatively high specific surface area, a relatively large pore size and a pore volume, and has a relatively high conversion rate, a relatively high stability and a relatively low CO selectivity when being used for catalyzing hydrogen production from methanol steam.

This invention relates to the field of honeycomb ceramic technology, specifically to a high-porosity, high-strength, ultrathin-walled cordierite honeycomb ceramic and its preparation method. In its main component, the talc with a narrow, lamellar particle size distribution has an Fe2O3 mass percentage ≥1.5%, an aspect ratio ≥10, and a particle size D... 97 The particle size is ≤30μm; the sphericity of both spherical alumina and molten spherical silica is ≥98%, and the mass percentage of the amorphous phase in molten spherical silica is ≥99.5%; the pore-forming agent is ultrafine silicon carbide powder. By limiting the morphology and particle size, the raw materials have excellent flowability and packing characteristics, effectively solving the technical problems of difficult molding and low green strength of high-pore-density ultrathin-walled honeycomb ceramic carriers; ultrafine silicon carbide powder replaces traditional organic pore-forming agents, and can decompose and volatilize during the low-temperature firing stage, significantly reducing the risk of firing cracking, improving the product qualification rate, and avoiding the problem of large-diameter defects caused by organic pore-forming agents.

The application provides a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery, and the silicon-carbon negative electrode material comprises a composite core composed of a silicon-based material and a porous MOFs material, and a carbon layer coated on the surface of the composite core; at least a part of the silicon-based material is embedded into the pore channel of the porous MOFs material; and the average pore diameter of the porous MOFs material is 400-1000 nm. At least a part of the silicon-based material is embedded into the pore channel of the porous MOFs material, so that the capacity advantage of the silicon material is fully exerted, the existence of the large pore diameter further improves the capacity of the silicon-carbon negative electrode material, and the volume expansion of the silicon is inhibited; and the carbon layer wraps the exposed silicon-based material which is not embedded into the pore channel, so that the structural stability and the conductivity of the material are improved. Therefore, the silicon-carbon negative electrode material constructed by the application has excellent electrochemical performance.

The application discloses a coenzyme Q10-loaded nano organic metal framework material and a preparation method and application thereof, and relates to the field of biological macromolecular materials and nanotechnology. The preparation method comprises the following steps: (1) preparation of Al-MOF; (2) preparation of the coenzyme Q10-loaded nano carrier Al-MOF; and (3) preparation of the coenzyme Q10-loaded nano carrier Al-MOF@PEG. In the application, 2,5-dihydroxyterephthalic acid and aluminum (Al) ions are selected, Al-MOF nano carriers are synthesized through a solvothermal method, coenzyme Q10 is loaded into the interspace of the Al-MOF nano carriers, then mPEG5k-NH2, i.e. a kind of PEG with an amino group, is selected, and the carboxyl on the surface of the Al-MOF is activated by dicyclohexyl carbodiimide (DCC), and the amino at the end of the PEG is covalently modified to the surface of the nano carrier Al-MOF through “click chemistry” between the carboxyl and the amino. The nano carrier Al-MOF has a larger pore size, the drug loading capacity is increased, the water solubility is significantly increased after the introduction of the PEG, the circulation time of the nano carrier in a physiological environment is prolonged, and the bioavailability of the coenzyme Q10 is further improved.

The application belongs to the technical field of catalyst carrier, and particularly relates to an alumina carrier and a preparation method and application thereof, which can be used for preparing a dehydrogenation catalyst, and the preparation method comprises the following steps: S1: adding an aluminum source into acid liquor for peptization to obtain an aluminum sol; S2: mixing the aluminum sol with a pore-expanding agent and an organic amine salt template agent, and adjusting pH to 4.0-6.0 to obtain a mixed sol; and S3: forming the mixed sol obtained in S2 into a sol wet ball through drop ball forming, and calcining to obtain the alumina carrier. The prepared alumina carrier has a strength greater than 45 N / particle, a most probable pore diameter greater than 30 nm, a specific surface area greater than 180 m 2 / g, an abrasion less than 0.1%, and a bulk density as low as <= 0.4 kg / L, and simultaneously has the performances of large pore diameter, high strength and low abrasion.