528 results about "Large pore" patented technology

The invention discloses a charcoal nano lanthanum material capable of synchronously removing organic phosphorus and inorganic phosphorus, and belongs to the field of environmental functional materials. The adsorbent comprises biochar and nano lanthanum loaded on the biochar, wherein the biochar is bamboo biochar; the nano lanthanum is in a La (OH) 3 form, the particle size of the nano lanthanum is 1-250nm, and the loading capacity of the nano lanthanum is 3-20wt%; the pore diameter of the biochar nano lanthanum material is 1-30nm, and the specific surface area is 100-250m < 2 > / g. Compared with a biochar-loaded nano lanthanum composite material in the prior art, the composite material has the inorganic phosphorus adsorption performance and also has the organic phosphorus adsorption effect, and inorganic phosphorus and organic phosphorus can be synchronously removed. According to the charcoal nano lanthanum material, organic phosphorus is adsorbed and removed by regulating and controlling the defect form of lanthanum, especially organic phosphonate can be hydrolyzed and removed, meanwhile, large pore channels of bamboo charcoal are beneficial to diffusion of macromolecular organic phosphorus to action sites of lanthanum, and the adsorption and hydrolysis effects of lanthanum on the organic phosphorus are further enhanced.

The invention belongs to the technical field of silicon dioxide delustering agents for coatings, and particularly relates to a preparation method of silicon dioxide for delustering paint with elastic hand feeling, which comprises the following steps: S1, preparing water glass and a sulfuric acid solution; s2, adding cationic and nonionic aqueous dispersants and a silane coupling agent into water glass, and then adding sulfuric acid to form silicon dioxide silica sol; s3, carrying out acid-base regulation, heating and boosting aging, aging generation and other steps to generate precipitated silicon dioxide; and S4, washing the precipitated silicon dioxide with pure water, an ammonium salt aqueous solution and pure water in sequence, drying, and carrying out wax powder treatment and crushing through a high-temperature jet mill to obtain the product. The silicon dioxide for delustering of the elastic paint has the advantages of large pore volume, small bulk density, small particle size, uniform distribution and easiness in dispersion, has the advantages of good delustering property and good hand feeling when being used in the elastic paint, and is easy to industrialize.

The invention relates to the technical field of preparation of bird inhabitation bricks, in particular to a bird inhabitation brick capable of conducting drainage, gradient dynamic adsorption of organic matter and blocking and filtering water through heavy metal and a preparation method thereof.The preparation method comprises the steps that S1, a photocatalytic purification layer, a biological filtering layer and an adsorption stabilizing layer are formed and then subjected to demolding treatment, and the upper surface of each layer of brick body is removed; the other surfaces are subjected to anti-seepage treatment; s2, sequentially splicing a photocatalytic purification layer, a biological filtering layer and an adsorption stabilizing layer from top to bottom, accurately butting the ceramic pipe buckle parts of each layer, and splicing the three layers of bricks into a whole ecological combined brick, so as to obtain the bird inhabiting brick for guiding and discharging, dynamically adsorbing organic matters in a gradient manner and blocking and filtering water by heavy metals. According to the invention, pollutants flowing into the brick body can be effectively treated through the synergistic effect of gradient pores, large-particle pollutants are intercepted by macropores on the surface layer, decomposed organic matters are adsorbed by mesopores in the biological filter layer, and dissolved pollutants such as heavy metal ions and the like are fixed by the adsorption stabilizing layer.

A TPC-OTBS n-hexane solution is added to a mixture of TPC-OSO2F, DMF, and DBU and allowed to stand to produce a crosslinked solvent gel; the crosslinked solvent gel is added to methanol, stirred, and dried to produce the porous crosslinked material. The gel acquired can be prepared into a pore-rich solid porous organic polymer material by means of solvent exchange. SEM and TEM are used to characterize the surface and internal morphologies of the solid material, and the porous morphology thereof is discovered, with large pores being the majority. Infrared and nuclear magnetic resonance are used to characterize the structure of a crosslinked polysulfate; the complete reaction of a sulfuryl fluoride group is proven by means of solid-state fluorine nuclear magnetic resonance spectroscopy and XPS element analysis; and the porous structure of the crosslinked polysulfate allows same to be provided with improved application prospect in terms of adsorption.

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 application relates to the technical field of fluorine-containing wastewater treatment, and discloses a MOF modified zeolite fluorine removal agent as well as a preparation method and application thereof, which comprises the following steps: subjecting natural zeolite to carboxylation or calcination pretreatment; preparing a MOF precursor; the MOF precursor is prepared from at least two kinds of rare earth metal ions in La 3+ , Ce 3+ or Zr 4+ and an organic ligand; adding the MOF precursor into a DMF solvent, then adding the pretreated natural zeolite, and ultrasonic treatment for 5-10 min; adding the obtained mixed solution into a high-pressure reaction kettle, and reacting at 160 DEG C for 24 h; after the high-pressure reaction kettle is naturally cooled, the mixed solution in the high-pressure reaction kettle is centrifuged, the precipitate is washed with DMF for 3-5 times, and then dried at 65-90 DEG C for 18-24 h, so that the MOF modified zeolite fluorine removal agent is finally obtained. The disclosed fluorine removal agent has larger pore volume and specific surface area, and has good fluorine removal effect.

The invention provides a high-performance supercritical foaming material as well as a preparation method and application thereof, and relates to the technical field of foaming material preparation. The material is composed of thermoplastic foaming elastomers (TPU, PEBAX, TPEE, EVA and TPE) and supercritical CO2 / N2 composite gas, and is prepared through a two or more gradient foaming process. The composite gas synergistic effect and the gradient foaming process are innovatively adopted, the problems of high density, large pore diameter, low rebound resilience and the like in the traditional technology are solved, the material density is controllable, the range is 0.07-1.6 g / cm < 3 >, the rebound rate reaches 75-85%, the pore diameter is uniform (the CV value is smaller than or equal to 15%), and the compression permanent deformation rate is smaller than 12%. And meanwhile, the bubble hole fracture rate is less than 5% through step-by-step pressure relief control, and the process efficiency is improved by 40%. The material is suitable for light-weight high-requirement fields such as shoe materials, aero seats and automobile interiors, and has remarkable industrialization value.

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 provides a method for determining the pore diameter lower limit and the effective pore volume ratio of movable fluid. The method comprises the steps that the temperature of each sample under the stratum in-situ condition is calculated according to the ground temperature gradient and the burial depth; correcting the surface tension coefficient of the water by using the calculated temperature; determining an average contact angle of water and shale; calculating capillary force, enabling the capillary force to be equal to reservoir fluid pressure, and calculating the lower limit of the aperture of the movable water; carrying out carbon dioxide adsorption, liquid nitrogen adsorption and mercury injection experiments on the sample to obtain connectivity pore volume-pore size distribution, and calculating effective pore volume in combination with a movable water pore size lower limit; carrying out a low-field nuclear magnetic resonance experiment, calculating the total pore volume of macropores, obtaining the total pore volume of small pores in combination with a carbon dioxide experiment, and finally calculating the total pore volume; and calculating the pore volume ratio of the effective pores by using the pore volume of the effective pores and the total pore volume. According to the method, the evaluation precision of the lower limit of the pore diameter of the shale reservoir movable fluid and the pore volume ratio of the effective pores is effectively improved, and the test cost is reduced.

The invention relates to the technical field of seeding, in particular to a belt-shaped furrow-pressing depth-control seeding compound plowing and seeding machine. Comprising a tilling and sowing machine body, and further comprises a rotary tillage mechanism, a rotary tillage mechanism and a rotary tillage mechanism, the sowing mechanism is provided with a belt pressing device for forming a downwards concave belt-shaped pressing belt on the land subjected to rotary tillage, a seed sowing device for sowing seeds into the belt-shaped pressing belt, a soil covering device for covering the sowed seeds with soil, and a compacting machine for compacting the soil after the soil is covered with the soil; the rotary tillage mechanism is connected with the tillage and seeding machine body, the seeding mechanism and the rotary tillage mechanism are in a split type, and the seeding mechanism is connected to the tail part of the rotary tillage mechanism. The compound ploughing and sowing machine can effectively reduce macropores in soil, improve the soil moisture preservation capacity and achieve the effect of a field seedling bed.

The invention belongs to the technical field of medical materials, and particularly relates to a composite hemostatic material and a preparation method and application thereof. Nanometer zeolite with a higher specific surface area and a larger pore volume is used as a basis of the composite hemostatic material, and a polyphenol compound is introduced into a traditional zeolite hemostatic material to serve as a barrier for inhibiting heat production, so that possible heat damage to surrounding tissues in the rapid water absorption process of zeolite is effectively avoided, secondary damage is avoided, and the hemostatic material has a good application prospect. The safety of the hemostatic material is improved; by compounding the nano-zeolite and the polyphenol compound, agglomeration among the nano-zeolite is reduced, more microporous structures are exposed, on the basis of promoting an exogenous blood coagulation mechanism, the blood coagulation performance is further improved from an endogenous blood coagulation mechanism, antibacterial performance is introduced while the blood coagulation performance is improved, heat damage is eliminated, and the blood coagulation activity is improved. The application range and safety of the composite hemostatic material as a hemostatic material are greatly expanded, so that the composite hemostatic material has a wide application prospect.

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.

The invention provides a ferrite-doped hierarchical pore biochar material with electromagnetic wave absorption performance and a preparation method thereof, and belongs to the technical field of wave-absorbing materials. The method comprises the following steps: crushing coconut shells into powder by a wall breaking machine, cleaning the coconut shells in a potassium hydroxide solution, and then transferring the obtained coconut shells into a cobalt nitrate solution and a ferric nitrate solution for dipping and drying; and finally, transferring the coconut shells impregnated in the cobalt nitrate and ferric nitrate solution into a tubular furnace, and calcining in a carbon dioxide atmosphere to obtain the ferrite-doped hierarchical porous biochar material with the electromagnetic wave absorption performance. The material shows a richer micro-mesoporous structure and larger pore volume and specific surface area compared with other activation methods under calcination activation of metals such as iron and cobalt in a carbon dioxide atmosphere, the micropore volume reaches 0.725 cm < 3 >. G <-1 >, and the mesopore volume reaches 0.695 cm < 3 >. G <-1 >.

The present invention belongs to the field of geological monitoring and discloses a device and method for observing the terminal channel of preferential seepage in large pores and constant water head in loess. The device comprises a camera, a funnel, foam glue, a first burette, a second burette, a three-way pipe for constant water head, a water bottle, a first iron stand, and a second iron stand. One end of the camera is fixed to the first iron stand. A permeable stone is set in the middle of the large opening of the funnel. The surface of the permeable stone is used to fix the original loess sample and the support tube. The space between the support tube and the loess sample is filled with foam glue. The first and third ends of the three-way pipe for constant water head are respectively connected to the water bottle and the first burette. The first burette and the second burette are connected by the second and third three-way pipes. Without disturbing the soil sample and with a fixed water head height, the terminal channel of preferential seepage in large pores and the water supply degree can be quickly observed. The work efficiency is high and the device is flexible and detachable. The device effectively solves the current problems of difficulty in capturing the preferential seepage large pore channels in loess and difficulty in measuring the water supply degree of original loess.

Manufacturing lightweight aggregate (LWA) by a sintering technique requires a delicate balance among three conditions: forming sufficient amount of molten liquid phase during sintering; reaching an appropriate viscosity for solid-liquid suspension; and emitting sufficient amount of gas that can be entrapped by the liquid phase to form pores. LWAs were made from low-calcium and high-calcium Waste Coal Combustion Ash (W-CCA) including fly ash and bottom ash. A mass fraction of at least 40% liquid phase for fly ash and 50% for bottom ash is required for a successful entrapment of emitted gaseous phases during sintering. Larger pores were observed in the microstructure of LWA samples made using high-calcium W-CCA in comparison to low-calcium W-CCA. This result was mainly attributed to the high-calcium samples forming liquid phases with lower viscosity values and emitting higher amounts of gaseous phase during sintering than did the low-calcium samples. The gaseous phase was generated by hematite reduction and anhydrite decomposition.

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.