436 results about "Macropore" patented technology

The invention relates to the technical field of concrete preparation, in particular to high-performance self-compacting concrete and a preparation method thereof, solves the defects in the prior art, and comprises the following components: cement, fly ash, slag powder, graphene oxide, nano-silica aerogel, a water reducer and an air entraining agent. Through silanization modification and magnetic field induction, the problem of interface incompatibility of GO and SA is solved. Graded mass transfer paths are formed between nano layers of GO and mesopores and macropores of SA. And the CaCO3 seed crystal in the SA hole directionally guides the oriented growth of the C-S-H gel, so that the early strength development rate is increased.

The invention relates to a silicon-carbon composite material with a porous structure and a preparation method thereof, and the silicon-carbon composite material with the porous structure comprises an N / P co-doped porous carbon skeleton with micropore, mesopore and macropore channel networks, and amorphous or low-crystalline nanometer silicon particles which are uniformly loaded in the porous carbon skeleton and have the average particle size of 15-40nm, the mass percent of silicon in the composite material is 40-60%, and good interface bonding is formed between silicon and carbon. The preparation method mainly comprises the following steps: firstly, preparing an N / P co-doped porous carbon skeleton through a template method in combination with high-temperature carbonization and N / P source co-pyrolysis; and hydrolyzing an organic silicon source in the carbon skeleton to form silicon dioxide, and performing low-temperature metal thermal in-situ reduction to obtain the nano-silicon loaded composite material. Through a unique porous carbon skeleton design and a precise in-situ composite strategy of nano silicon, the prepared material shows high specific capacity, high initial coulombic efficiency and excellent cycling stability and rate capability when being used as a negative electrode of a lithium ion battery.

The invention belongs to the technical field of activated carbon preparation, and particularly discloses a preparation device and method for increasing the micropore proportion of activated carbon through segmented activation. A steam activation section and a carbon dioxide activation section are arranged in an activation furnace of the device, and a material channel penetrates through the steam activation section and the carbon dioxide activation section; and a through hole penetrating through the wall thickness is formed in the side wall of the material channel. Materials are subjected to primary activation through the steam activation section, so that more mesopores and macropores are quickly formed in the materials, and then the materials are subjected to secondary activation through the carbon dioxide activation section, so that micropores are further formed in the materials, the number and proportion of the micropores are increased, and the desulfurization performance of activated carbon is improved. According to the technical scheme, the pore structure of the activated carbon is regulated and controlled in a segmented activation mode, the micropore proportion is increased, and therefore the desulfurization performance of the activated carbon is improved, the technological process is simple, meanwhile, waste heat of flue gas obtained after incineration and purification can be recycled, energy is saved, efficiency is high, and industrial application is easy.

The invention relates to an aromatic hydrocarbon isomer adsorbent containing a modified X-type molecular sieve. The outer surface area of the modified X-type molecular sieve is 9.5-19m < 2 > / g, and the sum of the pore volume of mesopores and the pore volume of macropores is 6%-18% of the total pore volume. The p-xylene adsorbent comprises 88-95% by mass of a modified X-type molecular sieve, 4-11% by mass of a crystal transformation X-type molecular sieve and 1-3% by mass of a matrix. The invention also relates to a preparation method of the adsorbent and application of the adsorbent in adsorption separation of p-xylene from mixed C8 aromatic hydrocarbons.

The invention relates to the technical field of preparation of nano catalytic materials, in particular to a preparation method of hierarchical pore channel mesoporous carbon loaded metal nanoparticles. According to the invention, biomass diatomite is used as a template to construct a vertically through macroporous channel, a block copolymer is introduced to form an ordered mesoporous structure, and a pore-foaming agent is added to generate a macro-pore network in a pyrolysis process, so that a macro-pore-mesoporous-micropore three-level communicated carbon-based skeleton is realized; and a bimetallic component is loaded on the hierarchical porous mesoporous carbon in a gradient confinement manner. The material disclosed by the invention has the advantages of fast mass transfer of macropores, stable nanoparticles of mesoporous confinement and efficient catalysis of monatomic sites, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention provides a porous carbon material, a preparation method thereof and a silicon-carbon negative electrode material containing the porous carbon material. The preparation method of the porous carbon material comprises the following steps: heating and carbonizing an organic carbon source in a protective atmosphere, keeping a certain vacuum degree at least when the temperature reaches the pyrolysis temperature of the organic carbon source in the carbonization process, and then performing or not performing activation to obtain the porous carbon material. The silicon-carbon negative electrode material comprises the porous carbon material and silicon coating and filling the surface and holes of the porous carbon material. According to the preparation method provided by the invention, the content of spherical pores and macropores in the porous carbon material is reduced, the content of columnar pores and cracked pores is increased, the pressure resistance of the porous carbon material and the silicon-carbon negative electrode material is improved, collapse of the silicon-carbon negative electrode material in the process of preparing an electrode by rolling is reduced, and the service life of the silicon-carbon negative electrode material is prolonged. And the silicon-carbon negative electrode material can maintain good electrochemical performance.

The invention discloses a preparation method for forming a hierarchical pore filter material through secondary coating. In order to solve the problems that an existing filtering material is single in pore diameter, and filtering efficiency and pressure drop are difficult to consider at the same time, the hierarchical pore filtering material is formed through the following steps that 1, first-time coating is conducted, specifically, a NaCl template agent and a PTFE solution are mixed according to the ratio of 7: 3, 7%-16% of a solvent is added, a NaCl-coated PTFE foaming solution is prepared, a polyphenylene sulfide needled felt is coated with the NaCl-coated PTFE foaming solution, pre-drying is conducted, and then washing is conducted to form a macroporous structure; 2, secondary coating: coating the macroporous layer with a PTFE foaming liquid containing an AC foaming agent, and carrying out stepped sintering to form micropores, so that efficient interception of particles of 0.5-2.5 microns is realized, and the pressure drop is reduced to 116-251Pa. The multi-stage hole filtering material is suitable for high-temperature flue gas treatment such as waste incineration, has high filtering performance and low running resistance, and has remarkable environmental protection and economic value.

Adsorbent material for use in pressure swing adsorption (PSA) related processing can provide improved purification processing with reduced temperature differentials between adsorption and desorption processing of the bed of adsorbent material. Embodiments can be configured so that adsorbent material has occluded micropores or macropores. The occlusion of the micropores or macropores can be up to 42% of the micropores the adsorbent material in some embodiments. At least one metal acetate can be utilized for the occlusion of the micropores or macropores. Utilization of the adsorbent material having occluded micropores or macropores was surprisingly found to increase the yield for purification of a product gas in spite of the occlusion of the micropores or macropores.

The invention belongs to the technical field of solid waste recycling and porous carbon material synthesis, and particularly relates to abandoned wind turbine blade-based porous carbon as well as a preparation method and application thereof. The method comprises the following steps: carbonizing waste wind turbine blade powder in first protective gas, etching, mixing the obtained primary porous carbon material with an activator, and carrying out pyrolysis activation in second protective gas to obtain the waste wind turbine blade-based porous carbon. According to the method, the waste wind turbine blade is converted into the graded porous carbon material with micropores, mesopores and macropores, the diffusion performance of gas in the pore channels is greatly improved through the synergistic effect of the graded porous structure, the performance advantages of high capacity, fast mass transfer and high adaptability are shown, a way is provided for high-value recycling of the waste blade, and the method is suitable for industrial production. And a low-cost material is provided for the fields of energy storage and conversion, environmental governance, catalysis, adsorption and separation and the like, and the material has remarkable economic and environmental benefits and a wide commercial prospect.

The invention particularly relates to a sulfur-loaded carbon microsphere with a hierarchical pore structure as well as a preparation method and application of the sulfur-loaded carbon microsphere. The invention provides a NiX (X = Se, Te) selenium and tellurium porous carbon microsphere sulfur-loaded positive electrode material prepared based on a spray drying technology. According to the material, gamma-cyclodextrin is used as a carbon source, NaCl is used as a template, and three-dimensional porous carbon microspheres with the particle size of 10-20 microns are formed through a spray drying method. Then, the carbonized particles are activated by KOH, and rich micropores are introduced on the basis of an original macroporous structure; and finally, loading sulfur into the porous carbon structure through a melt permeation method to prepare the sulfur composite positive electrode material suitable for the room-temperature sodium-sulfur battery. The three-dimensional porous carbon skeleton of the material can effectively buffer the volume change of sulfur in the sodium ion intercalation / deintercalation process, the electronic conductivity of an electrode is also remarkably improved, and the construction of a room-temperature sodium-sulfur battery positive electrode material with high specific capacity and high stability is facilitated.

The invention discloses a tubular dynamic membrane sulfur autotrophic denitrification device and method, the device comprises: a housing, which is composed of a middle cylindrical structure and two end hemispherical structures, the upper part of the cylindrical structure is provided with a purified water outlet, the lower part is provided with a backwashing port, and the top end of the hemispherical structure is respectively provided with a sewage inlet and a concentrated liquid outlet; the plurality of supporting bodies are arranged in parallel, each supporting body is composed of two layers of honeycomb-shaped PVC grids and a layer of polypropylene net, and the polypropylene net is clamped between the two layers of honeycomb-shaped PVC grids; the two splitter plates are fixed to the two ends of the supporting body respectively, and splitter holes corresponding to the supporting body are formed in the splitter plates; a large-aperture polypropylene net is used as a filtering support body, and powdered sulfur is used as a precoating agent, so that the problems of difficulty in powdered sulfur recovery and serious loss in the traditional sulfur autotrophic process are solved; meanwhile, sulfur powder with a certain particle size is used as a dynamic membrane reactor of a precoating agent, nitrate nitrogen can be efficiently removed, the effluent quality is improved, and meanwhile the dynamic membrane reactor has the advantages of being resistant to pollution and easy to clean.

The invention relates to the field of filtering materials, in particular to a filtering material for removing silicon and aluminum from ionic membrane caustic soda brine and a preparation method of the filtering material. The filtering material for removing silicon and aluminum from ionic membrane caustic soda brine comprises a hierarchical porous structure carbon adsorption material, the hierarchical porous structure carbon adsorption material comprises a plurality of large holes with the diameter of 800-1000 nm and a plurality of small holes with the diameter of 50-100 nm, and each small hole is located in the hole wall of the corresponding large hole. According to the invention, polymethyl methacrylate microspheres are used as macroporous templates, silicon dioxide nanoparticles are used as microporous templates, and gaps of the templates are filled with a carbon precursor through impregnation. A three-dimensional communicated macropore and micropore hierarchical structure is constructed by a double-template method, macropores are used as channels for rapid diffusion of silica-alumina colloid, and micropores are distributed on the wall surfaces of the macropores to provide a high specific surface area, so that the density of active sites is remarkably increased; the physical screening effect can selectively intercept target impurities, meanwhile, competitive ions such as calcium and magnesium ions are prevented from entering pore channels, and the dynamic adsorption capacity is remarkably improved compared with traditional activated carbon.

A method for determining dynamic strength of loess through average particle size and macropore ratio comprises the following steps: sampling and determining basic physical properties of a soil sample, preparing an artificial structural loess sample, determining loess n, # imgabs0 # under a microstructure, and determining the dynamic strength of the loess according to the average particle size and the macropore ratio. The method comprises the following steps: establishing a three-dimensional model of dynamic characteristics and a microstructure of loess under the action of a dynamic load by utilizing a particle analysis test and a mercury injection test, and fitting a loess sample n, # imgabs1 # formula; fitting a relation formula, establishing a model, and fitting a dynamic internal friction angle, dynamic cohesion, average particle size and macropore proportion formula through data; and finally, measuring the dynamic strength of the loess, and performing simple qualitative verification on the dynamic strength index of the loess by using the neural network according to the given data in the step 4 and adopting the Moire-Coulomb strength theory. The test precision and efficiency are improved.

The invention discloses a graded porous guanidyl resin-based CO2 adsorption material and a preparation method thereof, and belongs to the technical field of polymer synthesis. The prepared adsorption material is of a composite spherical structure and has a multi-stage pore channel structure including micropores, mesopores and macropores, the CO2 adsorption capacity of the material is effectively improved by introducing the hierarchical pore channel structure, the molecular diffusion resistance can be remarkably reduced by introducing hierarchical pore channels, and the contact area of an adsorbent and CO2 molecules is increased, so that rapid adsorption is achieved; and the pyridyl, the polyamino compound and the guanidyl have relatively strong alkalinity and chemical affinity to CO2, and through surface functional modification, active sites on the surface of the material are remarkably increased, so that the adsorption capacity and selectivity of CO2 are further 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.

The invention relates to the technical field of porous materials, in particular to an ordered multichannel network structure cellulose / molecular sieve composite material and a preparation method thereof.The composite material is of a stable porous framework structure formed by cellulose, molecular sieves are evenly distributed in the three-dimensional network structure of the composite material, the pore volume is larger than 0.2 cm < 3 > / g, and the composite material is composed of macropores (gt; 50 nm), mesopores (2-50 nm) and micropores (lt; the porous material can be used in a plurality of fields such as gas adsorption, purification and separation, and the like. The preparation method comprises the following steps: uniformly mixing cellulose and a zeolite molecular sieve which are used as raw materials, directionally freezing and co-assembling, and freeze-drying to obtain the cellulose / molecular sieve composite porous material with a macroscopic three-dimensional network structure and directional multiple channels. The prepared cellulose / molecular sieve composite material not only has a self-supporting network skeleton, a rich pore structure and a relatively high specific surface area, but also has directionally arranged pore channels, and the composite material has good flexibility and elasticity.

The preparation method comprises the following steps: S1, adding silicon powder, graphite, a carbon source and a pore-forming agent into a solvent to obtain slurry; the pore-forming agent comprises ammonium citrate and polylactic acid; s2, performing spray drying on the slurry to obtain precursor microspheres; s3, the precursor microspheres are subjected to first-stage low-temperature oxidation to form macropores, second-stage medium-temperature melting to form mesopores, third-stage high-temperature carbonization and cooling shaping, the heat preservation temperature of the first-stage low-temperature oxidation is 180-200 DEG C, the heat preservation temperature of the second-stage medium-temperature melting is 340-360 DEG C, the heat preservation temperature of the third-stage high-temperature carbonization is 800-900 DEG C, and the gradient pyrolysis dual-pore-forming silicon-carbon negative electrode material is obtained. Through combined use of ammonium citrate and polylactic acid and control of gradient pyrolysis conditions, synergistic distribution of double-peak gradient pores is formed, and effective improvement of the first effect and the cycle performance can be realized.

The present application relates to the technical field of nano-catalytic material preparation, in particular to a preparation method of multi-stage pore mesoporous carbon loaded metal nanoparticles, which constructs vertical and through macroporous channels by taking biomass diatomite as a template, forms ordered mesoporous structure by introducing block copolymer, and realizes macro-pore-mesopore-micropore three-stage communication of carbon-based skeleton by adding porogen to produce macro-porous network in the pyrolysis process, and gradientally limits and loads bimetallic components on the multi-stage pore mesoporous carbon. The material has the advantages of macroporous rapid mass transfer, mesoporous limited stable nanoparticles and single-atom site efficient catalysis, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention discloses microporous layer slurry, a microporous layer and a fuel cell, the microporous layer slurry comprises first carbon powder, second carbon powder and a mixed solvent, the mass ratio of the first carbon powder in the microporous layer slurry is 4-10%, the mass ratio of the second carbon powder in the microporous layer slurry is 2-6%, and the particle size of the first carbon powder is smaller than that of the second carbon powder; the microporous layer slurry is used for being coated on the surface of a substrate layer of the gas diffusion layer to form a microporous layer. Two kinds of carbon powder with different particle sizes are adopted, macropores can be effectively formed in the microporous layer in the process of coating the surface of the substrate layer, effective water and gas channels are established, water and gas transmission balance in the operation process of the fuel cell can be conveniently controlled, a large amount of water generated by the cathode under high power can be efficiently discharged out of the fuel cell, and the fuel cell efficiency is improved. The cathode flooding phenomenon and the anode antipole phenomenon caused by excessive water are avoided to a great extent, and the performance of the fuel cell under high current density can be improved.

The invention discloses a novel graphite negative electrode material as well as a preparation method and application thereof. The novel graphite negative electrode material comprises a three-dimensional porous material with micropores, mesopores and macropores; wherein the aperture of the novel graphite negative electrode material is between 0.1 nm and 80 nm, the micropore rate is between 30% and 80%, the mesopore rate is between 20% and 50%, and the macropore rate is between 10% and 40%; the total pore volume of the novel graphite negative electrode material is between 0.5 cm < 3 > / g and 8 cm < 3 > / g, and the specific surface area is between 500 m < 2 > / g and 3500 m < 2 > / g; the novel graphite negative electrode material is obtained by carrying out oxidation and high-temperature expansion treatment on graphite to form mesopores and macropores and then forming micropores by using a pore-forming agent; the novel graphite negative electrode material disclosed by the invention is applied to a secondary battery, so that the polarization effect of the battery is effectively reduced, rapid transmission and storage of ions are facilitated, and the specific capacity and rate capability of the battery are effectively improved.

The invention provides a porous carbon material for a silicon-carbon negative electrode. The porous carbon material comprises a porous carbon skeleton with a graded pore structure; the silicon-based active units are uniformly dispersed in mesopores and macropores of the porous carbon skeleton, and each silicon-based active unit is composed of a nanometer silicon particle inner core and a silicon monoxide layer coating the surface of the nanometer silicon particle inner core; and the conductive reinforced shell is a gas-phase cracking carbon layer which is completely coated on the outer surface of the complex of the porous carbon skeleton and the silicon-based active unit. The preparation method of the porous carbon material comprises the following steps: preparing a porous carbon skeleton precursor, carrying out graded pore-forming treatment, carrying out surface functionalization treatment, compounding the silicon-based active units, constructing a conductive reinforced shell, carrying out element doping treatment and functionalizing pore channels. The cycle stability and environmental protection property of the silicon-carbon negative electrode are synergistically improved through graded pore constrained expansion, carboxyl bonding stable interface and vapor deposition carbon layer optimized conductivity.

The invention discloses a lightweight composite material for buildings and a preparation method thereof. The composite material is prepared from the following raw materials: nano cellulose whiskers, expansible graphite, thermoplastic polyurethane, polystyrene foam particles (or polylactic acid-based degradable microspheres), a compatilizer, an auxiliary agent, a chemical foaming agent, a polylactic acid (PLA) nano-scale degradable template and the like. The preparation method comprises the specific steps of raw material pretreatment, mixing, macropore generation, micropore introduction, template use, template removal, molding processing and the like. According to the preparation method of the composite material, a multi-scale pore structure is constructed, macropores serve as a main frame to bear main loads while the weight of the material is reduced, micropores effectively disperse stress concentration, meanwhile, low density is maintained, and good balance of light weight and high strength is achieved. Meanwhile, the multi-scale porous structure has the advantages of being light in weight, high in strength, good in heat insulation and sound insulation performance, environmentally friendly, degradable and the like.

The invention relates to a macroporous bovine serum albumin nanoparticle and a preparation method and application thereof, the macroporous bovine serum albumin nanoparticle is a nanoparticle with macropores distributed on the surface, the size range of the nanoparticle is 300-645nm, and the macropores are through holes with the aperture range of 50-100nm; the nanoparticles are symmetrical N-surface or spherical nanoparticles, wherein N is greater than or equal to 12. The specific surface area reaches up to 20-60 m / g, the drug loading capacity (5-25% w / w) and the encapsulation efficiency (50-90%) are remarkably improved, and the adsorption efficiency is greatly improved compared with that of traditional nanoparticles without holes in the surfaces. Compared with BSA nano-particles without holes in the surface, the absorption efficiency of RhB is improved due to the existence of macroholes, and the BSA nano-particles have wide application in the aspect of drug delivery.

The invention belongs to the technical field of fishpond filtering materials, and discloses a preparation method of a fishpond filtering composite carbon material and the fishpond filtering composite carbon material. The preparation method of the fishpond filtering composite carbon material comprises the following steps: 1) performing kneading and extrusion molding treatment on mixed powder comprising modified bentonite, biomass powder, diatomite, a pore forming agent and a photocatalyst and a binder solution to obtain a green body; 2) drying the green body, performing multi-section programmed heating carbonization in an inert atmosphere, and cooling to obtain a porous carbon ceramic framework loaded with a photocatalyst; 3, the porous carbon ceramic framework is soaked in the graphene oxide dispersion liquid, and the fishpond filtering composite carbon material.The fishpond filtering composite carbon material is obtained.The preparation temperature is relatively low, the fishpond filtering composite carbon material has a developed macropore-mesopore-micropore graded pore structure, and efficient physical adsorption, photocatalytic degradation and microbial biofilm culturing functions can be achieved at the same time.

The invention relates to the technical field of environmental waste treatment, and discloses a preparation method of modified household garbage incineration fly ash, the modified household garbage incineration fly ash comprises the following components by mass: 90-99 parts of a fly ash matrix; 0.1 to 2 parts of a plasma activation layer; 0.5 to 8 parts of a silicon oxide coating layer; the preparation method comprises the following steps: pretreating the fly ash; performing plasma activation; preparing a mineralizing solution; performing biomimetic mineralization; and calcining at low temperature. The plasma activation layer is introduced, the silicon oxide coating layer is constructed, and the phosphorus oxide or the boron oxide is cooperatively introduced, so that the microstructure and the surface chemical property of the material are effectively optimized, the specific surface area and the pore volume of the material are increased, and a microporous, mesoporous and macropore synergistic multistage pore channel structure is constructed; the adsorption capacity and the adsorption rate of various waste gas pollutants are improved.

The invention discloses a method for preparing an adsorption material for simultaneously extracting rubidium and cesium by using soft / hard template co-assembly and application, and belongs to the technical field of adsorption material preparation. The invention aims to solve the problems that a traditional adsorbent is poor in selectivity to similar alkali metal ions, slow in mass transfer rate, insufficient in acid environment stability and lack of an adsorption material for specific recognition of rubidium and cesium ions. The method comprises the following steps: 1, preparing cesium-imprinted hierarchical-pore mesoporous silica; 2, Cs / Rb-HMS is prepared; according to the invention, a macroporous-mesoporous channel is constructed; wherein a large hole (PS template) provides a rapid mass transmission channel, and an ion diffusion path is remarkably shortened, so that target ions can rapidly reach adsorption sites in the material; mesopores (Pluronic F127 template) provide a huge specific surface area and load a large number of Cs < + > imprinting sites and Rb < + > imprinting polymer layers, so that high adsorption capacity to Cs < + > and Rb < + > is ensured.

The invention relates to the technical field of adsorption separation, in particular to a carbon dioxide adsorbent and a preparation method and application thereof. The provided carbon dioxide adsorbent comprises an adsorption matrix, the adsorption matrix is provided with a composite pore structure, the composite pore structure comprises mesopores and macropores, the pore diameter range of the mesopores is 10 nm to 50 nm, and the pore diameter range of the macropores is 100 nm to 500 nm; the adsorption matrix comprises at least one of metal oxide or basic salt. The preparation method of the carbon dioxide adsorbent comprises the following steps: mixing an adsorption precursor with a first pore-forming agent, and treating by a chemical method to obtain a first intermediate with mesopores; mixing the first intermediate with a second pore forming agent and a binder to obtain a second intermediate; and carrying out molding treatment and calcination treatment on the second intermediate to obtain the carbon dioxide adsorbent with the composite pore structure. The invention can alleviate the problem that the current carbon dioxide adsorbent is easy to sinter and block after being recycled for many times due to small pore channels.

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 discloses a preparation method and application of doped hierarchical porous manganese dioxide, and belongs to the field of catalyst preparation and air purification. According to the invention, potassium permanganate is used as a manganese source and an oxidizing agent, a modified reducing agent is added, mixing and stirring reaction are carried out at room temperature, and the doped hierarchical porous manganese dioxide catalyst is synthesized after washing, drying and high-temperature treatment. The preparation method is simple in preparation process and high in repeatability; the prepared manganese dioxide realizes doping of potassium ions and formation of oxygen vacancies, and the catalytic activity of the manganese dioxide is improved; the doped manganese dioxide catalyst has a multi-stage structure of micropores, mesopores and macropores, the multi-stage pore structure endows the doped manganese dioxide catalyst with a relatively large specific surface area, the physical adsorption capacity of the doped manganese dioxide catalyst can be improved, and meanwhile, more active sites are exposed, so that the doped manganese dioxide catalyst shows relatively high activity and stability in a reaction for catalytically oxidizing gaseous pollutant formaldehyde at room temperature.