852 results about "Large pore" patented technology

The invention belongs to the field of catalysts, and particularly relates to an alumina carrier as well as a preparation method and application thereof. The surface of the alumina carrier has oxygen-containing groups, and the density of the oxygen-containing groups on the surface of the alumina carrier is 0.15-5mmol / m < 2 >. Wherein the oxygen-containing group is at least one of hydroxyl, carboxyl and lactone group; the specific surface area of the alumina carrier is 10-150m < 2 > / g. The types, the number and the density of oxygen-containing groups on the surface of the obtained carrier are improved, and various index requirements of various supported catalysts on dispersion forms and dispersion degrees of different metal active components in the field of petrochemical engineering can be well met; and the carrier also has the characteristics of low bulk density, high water absorption rate, large pore volume and large average pore size, has a gain effect on uniform distribution of active metal components in the catalyst loading process, and has extremely high application value.

The invention discloses a method for preparing biological aviation kerosene by hydrogenation of waste grease, which comprises the following steps: mixing pretreated waste grease and coal tar to form mixed raw oil, reacting under the continuous action of a catalyst I and a catalyst II to obtain generated oil, and introducing the generated oil into a high-pressure separator for separation to obtain the biological aviation kerosene. And carrying out high-pressure steam stripping on the separated product, passing the stripped product oil through a hydroisomerization reaction unit, and then carrying out normal-pressure fractionation to obtain the biological aviation kerosene. According to the preparation method, firstly, raw materials are improved, pretreated waste grease is adopted, the reaction efficiency can be improved through the pretreated waste grease, in the process that H2S iO3 is adopted for modifying Cu / gamma-Al2O3, and H2S iO3 auxiliaries and active components are introduced, high-temperature roasting can cause damage to a lamellar structure on the surface of a gamma-A2O3 carrier, and in the process, high-temperature roasting can cause damage to the surface of the gamma-A2O3 carrier; the adjacent pore structures of the carrier material are combined to form a larger pore diameter, and part of the pore structures of the catalyst can be filled, so that the conversion efficiency is increased.

The present invention relates to the technical field of nanofiltration membranes, and particularly relates to a preparation method for a positively charged nanofiltration membrane for improving a "trade-off" effect. The preparation method comprises the following process: sequentially adding a water phase and an oil phase to the surface of a support layer to perform a reaction, so as to prepare a polyamide layer; pouring in a functionalized graphene dispersion; and sequentially placing same into an N,N-dimethyl propane diamine solution, a sodium borohydride solution and an iodomethane solution to perform a reaction, so as to obtain a nanofiltration membrane, wherein the functionalized graphene is pyrrolidone-based graphene. According to the present invention, a mixture of piperazine and polyethyleneimine is used as a water phase and is subjected to interfacial polymerization with an oil phase 1,3,5-trimesoyl chloride on the surface of the support membrane; and by means of the compounding of micromolecular piperazine and macromolecular polyethyleneimine, the rapid formation of a polyamide layer is promoted, the distance of a system cross-linked network is increased, a positively charged polyamide layer having a large pore diameter and good hydrophilicity is formed, and a good water flux and a good rejection rate are achieved, thereby improving the "trade-off" effect.

The invention relates to a preparation method of silica gel microspheres used as a catalyst carrier, which comprises the following steps of: adjusting the speed of converting acidified water glass into gel by means of controlling material temperature and material concentration, multiple times of acidification and the like, so that the acidified water glass is atomized to form liquid drops, and then the liquid drops are quickly converted into the gel; and carrying out aging, acid washing, water washing, supercritical carbon dioxide drying, roasting in an atmosphere furnace and the like to prepare the silica gel microspheres with high specific surface area and large pore volume. Compared with the prior art, the specific surface area of the obtained silica gel can reach 250-450 m < 2 > / g, the pore volume can reach 1.5-3.0 cm < 3 > / g, and the silica gel has good strength and fluidity.

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 discloses a large-aperture aluminum oxide loaded copper-based catalyst as well as preparation and application thereof. The large-aperture alumina-loaded copper-based catalyst comprises a large-aperture alumina carrier, and copper oxide and lanthanum oxide loaded on the surface of the large-aperture alumina carrier, the large-aperture alumina-loaded copper-based catalyst is granular, the specific surface area is 250-500 m < 2 > / g, the pore volume is 1.0-2.0 cm < 3 > / g, the average aperture is 16-30 nm, and the pore diameter of the large-aperture alumina-loaded copper-based catalyst is 20-30 nm. The large-aperture alumina supported copper-based catalyst comprises the following components in percentage by mass: 79%-98.9% of a large-aperture alumina carrier, 0.1%-6% of copper oxide and 1%-15% of lanthanum oxide. The large-aperture aluminum oxide loaded copper-based catalyst disclosed by the invention shows relatively high catalytic activity and higher alcohol selectivity in a reaction for preparing higher alcohol from ethanol, and particularly has relatively high C6-C10 fatty alcohol selectivity.

The invention provides an aggregation-induced emission molecule, a nano motor and a preparation method and application of the aggregation-induced emission molecule, the aggregation-induced emission molecule is used for near-infrared emission, has photo-thermal properties, and has the characteristics of near-infrared II region luminescence, heat production and good light stability; the nano motor is prepared by taking an asymmetric double-mesoporous nano material with different pore diameters as a support material and selectively loading aggregation-induced emission molecules on one side of the support material with a larger pore diameter; under the irradiation of near-infrared light, the aggregation-induced emission molecules with the photothermal effect can form a non-uniform thermal gradient to push the self-thermophoresis movement of the nano motor; tumor sites can be diagnosed and reported under the mediation of near-infrared II region imaging; through the photo-thermal effect, the motor can destroy tumor interstitial cells and degrade tumor matrix components; and in combination with autothermophoresis, blood vessels can be penetrated, so that penetration to the deep layer of the tumor can be realized.

The invention provides a large-aperture alumina carrier as well as a preparation method and application thereof. The large-aperture alumina carrier is prepared from dry materials and water, and the dry materials comprise inert fibers, aluminum hydroxide and ammonium aluminum carbonate. According to the invention, under the condition of low water-powder ratio, primary pores and secondary accumulation pores in aluminum hydroxide and ammonium aluminum carbonate are reserved to the greatest extent under high extrusion pressure in the carrier extrusion and molding process due to the enhancement effect of inert fibers; although the apertures of the primary pores, the secondary accumulation pores and the macropores generated by decomposition of the ammonium aluminum carbonate are reduced during roasting of the carrier, the volume ratio of the pores with the pore size of more than 500nm in the final carrier is still obviously increased due to the existence of the inert fibers, and the volume ratio of the pores with the pore size of more than 500nm is 15-25%. In addition, the by-product ammonium aluminum carbonate generated in the recovery process of the waste ethylene oxide catalyst is used as the raw material and the macroporous pore-enlarging agent, so that the production cost of the large-aperture alumina carrier is reduced. The prepared large-aperture alumina carrier can be used for preparing a residual oil hydrodemetallization catalyst.

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 present invention provides a method for preparing large-pore spherical alumina, and relates to the technical field of spherical alumina. The preparation method of the present invention comprises the following steps: mixing pseudo-boehmite powder with water to obtain a suspension, adding a peptizing agent for peptization to prepare an aluminum hydroxide sol; adding cross-linking molecules to the aluminum hydroxide sol to form a system to be cross-linked; adding a cross-linking agent to the system to be cross-linked to obtain a sol containing a prepolymer; and subjecting the sol to oil-ammonia column molding, drying and roasting to obtain large-pore spherical alumina. The present invention adopts an oil-ammonia column molding method, which does not require the addition of a pore-expanding agent or new equipment, and the preparation process is simple and does not introduce new impurities, so it is suitable for industrial production. The large-pore spherical alumina prepared by the present invention has a pore volume of up to 0.60cm 3 / g or more, and can be used as a propane dehydrogenation catalyst carrier.

The present invention relates to the field of adsorption materials. Disclosed are a lithium adsorption material, a preparation method therefor and a use thereof. The lithium adsorption material comprises a core and a shell covering the surface of the core; pores are formed in the shell of the lithium adsorption material, and the average diameter of the pores measured by a SEM electron microscope is 0.01-2.5 μm; the core of the lithium adsorption material comprises finger-like pores, and in the cross section of the lithium adsorption material, the maximum average length of the finger-like pores measured by the SEM electron microscope is 1-7 μm, and the minimum average length is 0.05-2.5 μm; and the thickness of the shell of the lithium adsorption material measured by the SEM electron microscope is 1-550 μm. The lithium adsorption material with the specific structure has a special structure having small pores in the outer shell and large pores in the inner core, the mass transfer rate of water and salt can be increased, and when the lithium adsorption material is used for extracting lithium in a liquid environment, the adsorption capacity for lithium can be significantly improved.

The invention discloses a preparation method and application of an antioxidant MXene-based flowing electrode material capable of realizing efficient capacitance defluorination, and belongs to the technical field of water treatment. The preparation method comprises the following steps: sequentially carrying out nitrogen doping and cysteine modification on MXene to obtain the antioxidant MXene-based flowing electrode material capable of realizing efficient capacitance defluorination. The MXene is prepared by a Lewis acid fused salt etching method. According to the method disclosed by the invention, the electrochemical performance of the MXene electrode is effectively improved, the conductivity of the MXene electrode is enhanced, the protection of terminal groups is realized through cysteine modification, and the oxidation resistance of the MXene electrode is improved. The anti-oxidation MXene-based flowing electrode material prepared by the invention has high specific surface area, large pore volume and multiple adsorption sites, and can realize specific efficient adsorption of fluorine ions through ion intercalation and special functional groups at end positions.

Transalkylation processes using catalysts comprising three dimensional 12 membered ring zeolites with a combination of small and large pores are described. These catalysts have increased conversion of alkylphenols to phenol, cresols, and alkylbenzenes from coal-derived liquid streams compared to catalysts consisting of HZSM-5 zeolite.

The invention discloses two aluminosilicate molecular sieves with super-macroporous structures, the synthetic state schematic chemical composition of the molecular sieves is rROH: a (OH <-> or F <->): xAl2O3: SiO2: wH2O, the schematic chemical composition of the molecular sieves after roasting is (HAlO2) x.SiO2, the molecular sieves are NJU120-1, and after roasting of the NJU120-1, the molecular sieves have the molecular weight of 250,000-350,000. A framework structure composed of a T (Si, Al) O4 tetrahedron has a 22 * 10 * 10 membered ring three-dimensional pore channel system, the molecular sieve is NJU120-2, and after the NJU120-2 is roasted, the framework structure composed of the T (Si, Al) O4 tetrahedron has a 22 * 12 * 10 membered ring three-dimensional pore channel system. The preparation method is reasonable in design, is a novel germanium-free, high-silicon or pure-silicon and fully-connected super-macroporous molecular sieve material, not only has very important practical application value in the fields of catalysis, adsorption separation and the like, but also has very important theoretical significance for enriching molecular sieve structure families.

The invention discloses a method for preparing a core-shell structure phase hydrorefining catalyst, comprising the following contents: (1) gelling, aging and filtering a first precipitant, a sodium molybdate solution and a solution containing Ni and Si to obtain a filter cake of a first slurry, and then treating it with a mixed aqueous solution of aluminum salt and organic alcohol to obtain a mixed slurry; (2) adding a Ni-containing solution, a sodium tungstate solution, a second precipitant and the mixed slurry obtained in step (1) to a reactor containing water and an oily liquid to gel and age them to generate a second slurry; (3) filtering, drying and molding the slurry to obtain a molded product; (4) soaking the molded product in an organic acid solution, and desalting the soaked molded product to obtain a catalyst. The preparation process of the method is clean and pollution-free, and the prepared catalyst has a core-shell structure, a large pore volume and a large pore size, and is used in processes such as distillate hydrodesulfurization and denitrogenation, and has high hydrodesulfurization and hydrodenitrogenation reaction performance.

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 discloses a high-strength cross-linked polymer gel profile control agent and a preparation and use method thereof, and the profile control agent comprises the following components by mass: 0.2-0.5% of polyacrylamide; 1 to 5 percent of silicon modified polyacrylamide gel particles; 0.12 to 0.3% of phenolic resin; 0.24 to 0.6 percent of absolute ethyl alcohol; 0.05 to 0.2 percent of oxalic acid; and the balance of water. Compared with the prior art, the plugging agent disclosed by the invention can be used for oil reservoirs with medium-high temperature of 80-120 DEG C, large permeability difference and large pore or crack development. The silicon-modified polyacrylamide gel particles can be subjected to a cross-linking reaction with polyacrylamide of a macromolecular chain structure, the polyacrylamide is self-crosslinked at the same time, and finally the silicon-modified polyacrylamide gel particles are crosslinked and fixed in a polyacrylamide cross-linked network structure to form an integrated cross-linked structure, so that the strength is higher.

The invention provides anhydrous magnesium chloride and a preparation method thereof, and the preparation method comprises the following steps: mixing MgCl2. NH2O and ammonium chloride, carrying out ball milling, tabletting and granulating the mixed material, and heating and sintering the obtained flaky particles to obtain the anhydrous magnesium chloride, wherein n is an integer, and 0 < n < = 6. The water-containing magnesium chloride and the ammonium chloride can form an alternately coated sandwich structure through the pretreatment modes of ball milling and tabletting granulation, so that hydrogen chloride gas and ammonia gas generated during heating decomposition are diffused from the inside of the flaky particles to the outside, and meanwhile, the water-containing magnesium chloride in the particles can be fully exposed in a hydrogen chloride atmosphere; mgO generated in the sintering process is reduced; according to the tabletting and granulating method, large pores can exist among the flaky particles, generated water molecules can be taken away from a heating system from the pores existing among the flaky particles along with gas circulation in the heating and sintering process, and dehydration is better achieved. Meanwhile, the method is more beneficial to model selection of dehydration equipment.

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 provides a silicon-carbon negative electrode active material and a preparation method thereof, a negative electrode pole piece and a battery, the method comprises the following steps: mixing phenolic resin, a conductive agent, a pore forming agent and a solvent to obtain a dispersion liquid, spray-drying the phenolic resin, the conductive agent and the pore forming agent according to a mass ratio of (60-90): (5-20): (5-20) to obtain a spherical modified phenolic resin precursor; sequentially carrying out aging treatment, carbonization treatment and activation treatment on the modified phenolic resin precursor under a protective gas condition to obtain a modified resin-based carbon skeleton; and placing the modified resin-based carbon skeleton in a protective gas condition, and introducing a silicon source for vapor deposition to obtain the silicon-carbon negative electrode active material. Therefore, the silicon-carbon negative electrode active material with relatively large micropore proportion, relatively low resistivity, relatively large pore volume and relatively large specific surface area is obtained, and the charge-discharge formation and cycle performance of the battery is improved.

The invention provides a nano-porous Co3Ti / Co composite electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: cleaning high-purity Co and Ti metal sheets, corroding oxides on the surfaces of Al metal sheets, then placing the Co, Ti and Al metal sheets in an electric arc furnace for melting to obtain alloy ingots, then preparing small alloy ingots through a directional solidification technology, and carrying out corrosion treatment on the alloy ingots to finally obtain the nano-porous Co3Ti / Co composite electrode. According to the electrode, a Co3Ti / Co intermetallic compound is seamlessly integrated on a Co ligament with a dual-mode pore structure (large pores are about 200nm, and small pores are about 3nm), so that the specific surface area of an electrode material is effectively increased, and the mass transfer and electron transport capabilities of an electrolyte are improved. Meanwhile, Co and Ti sites in the intermetallic compound are beneficial to adsorption of H and OH intermediates respectively, so that water dissociation and * H adsorption / desorption processes are promoted, alkaline hydrogen evolution reaction kinetics is remarkably enhanced, and an efficient electrode material is provided for hydrogen production application.

The invention discloses a gradient pore structure geopolymer asphalt mixture warm mixing agent which is composed of the following components in parts by weight: 65-85 parts of regenerated micro powder, 15-35 parts of rice hull ash, 15-20 parts of a sodium silicate solution, 5-10 parts of sodium hydroxide and 10-20 parts of deionized water. The invention also discloses a preparation method of the geopolymer asphalt mixture warm mixing agent. The geopolymer asphalt mixture warm-mixing agent has a gradient pore structure and has no closed pores or semi-closed pores, so that the water carrying capacity in the geopolymer asphalt mixture warm-mixing agent can be greatly improved, and the pore structure is arranged in a gradient manner (gradually released from large pores to small pores), so that the water release period of the warm-mixing agent can be effectively prolonged, and meanwhile, the water release rate can be uniform; compared with a hot-mixed asphalt mixture, the geopolymer asphalt warm-mixing agent with the gradient pore structure has the advantages that the mixing temperature of the asphalt mixture can be remarkably reduced, and meanwhile, the high and low temperature performance, the water damage resistance and the fatigue resistance of the asphalt mixture can be improved.

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 present application discloses a bimetallic element doped silicon dioxide composite nanomaterial and its preparation method and application. The composite nanomaterial comprises a metal element and silicon dioxide with a hollow shell structure; the metal element is selected from at least two of zinc, cobalt, nickel, manganese, copper or iron; the internal cavity size is 50 to 500 nm; the specific surface area is 500 to 1000 m 2 / g, pore volume is 1.2~2.0cm 3 / g. The process of this application is simple, and the removal of the template and the construction of a complex hollow mesoporous structure are achieved at the same time. The rich and ordered metal composition and unique coordination instability of the coordination polymer are used as a metal source and a structure-guided template to form an internal cavity and dope metal elements at the same time. The material has a regular morphology, uniform size, good dispersion, single / double shell and hollow structure, high specific surface area and large pore volume, and has good application prospects in catalysis, energy utilization and conversion.

The invention discloses a preparation method of an aluminum silicate-based nanoflower porous material, the prepared product presents a special nanoflower-shaped morphology, has fibrous open pore channels, and has the characteristics of highly open space, effective utilization of active sites and the like, aluminum salt, TEOS (tetraethyl orthosilicate) and the like are adopted as raw materials, and the aluminum silicate-based nanoflower porous material is prepared. A novel catalyst carrier material with a nano flower-shaped structure is prepared by a hydrothermal method. Due to the large pore volume between the nano petals and an excellent directly reachable interface structure, various catalytic active sites can be well dispersed on the surfaces of the petal structures. The preparation process is simple and controllable, and the obtained product is rich in hole pattern, high in specific surface area and convenient for industrial preparation. Meanwhile, the obtained product is convenient for further processing and preparation of a catalyst with extremely excellent performance.

The invention provides a modified asphalt anti-collapse plugging agent for drilling fluid and a preparation method of the modified asphalt anti-collapse plugging agent, and belongs to the technical field of drilling plugging materials. The modified asphalt anti-collapse blocking agent for the drilling fluid is prepared from the following components in parts by weight: 42 to 68 parts of emulsified asphalt, 5 to 8 parts of chloroprene rubber, 8 to 12 parts of ethylene propylene rubber, 2 to 8 parts of cationic surfactant, 3 to 6 parts of water-soluble silicone oil, 20 to 35 parts of modified nano silicon dioxide, 0.1 to 1 part of carbon fiber, 1 to 3 parts of dispersing agent and 20 to 40 parts of water. The modified asphalt anti-collapse plugging agent prepared by the invention adopts emulsified asphalt, has small instantaneous filter loss and small high-temperature and high-pressure filter loss, and has a good plugging effect; the plugging agent can be easily dispersed in a drilling fluid, has environmental tolerance and high temperature resistance, can be used for plugging nano cracks and macro-pore stratums, can be applied to various complex stratums, is simple in preparation process and is suitable for industrial production.

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 discloses a biomass porous carbon electrode material, a preparation method thereof and application of the biomass porous carbon electrode material in a room-temperature sodium-sulfur battery, and belongs to the technical field of preparation of a room-temperature sodium-sulfur battery positive electrode material.The biomass waste is pretreated and then pre-carbonized, then a pore-forming agent is added for mixing, ball milling and activation, a hydrochloric acid solution is added, heating and stirring are conducted, and cleaning and suction filtration are conducted to obtain the biomass porous carbon electrode material. And mixing the biomass porous carbon material with sulfur powder, and carrying out heat treatment so as to obtain the biomass porous carbon electrode material. The positive electrode is activated by a chemical reagent, has a multi-stage pore structure and inhibits the volume expansion of the positive electrode in a physical mode. According to the present invention, the large pores are beneficial to the passing of electrolyte ions, the mesopores can ensure the high sulfur loading amount, and the small pores can provide the extremely high specific surface area and the large adsorption volume, such that the shuttle effect caused by the conversion of the polysulfide in the room temperature sodium-sulfur battery can be effectively solved, and the actual specific capacity and the rate capability of the room temperature sodium-sulfur battery can be improved;

The invention discloses a magnetic immobilized enzyme and a preparation method and application thereof in preparation of chitosan oligosaccharide, the immobilized enzyme comprises a carrier and an enzyme loaded on the carrier, the carrier is a magnetic nanoparticle modified double-hole silicon dioxide nanoparticle, the double-hole silicon dioxide nanoparticle simultaneously contains a plurality of macropores and a plurality of micropores, and the macropores and the micropores are uniformly distributed on the carrier. The aperture of the large hole is 20-40nm, the aperture of the small hole is 2-5nm, and the magnetic immobilized enzyme has strong magnetism, is more rapid and convenient to recover, has good reusability, is simple and convenient to operate, has a wide application prospect, and is suitable for industrial preparation of chitosan oligosaccharide.