19results about How to "Improved pore size distribution" patented technology

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention belongs to the field of gas technical purification, and particularly relates to a honeycomb-shaped high-concentration NO2 adsorption trapping material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing adsorbent slurry by taking high-silicon molecular sieve raw powder as a raw material; (2) putting a honeycomb carrier into the adsorbent slurry for dipping and coating; and (3) naturally airing, drying and roasting the impregnated carrier to obtain the integral honeycomb-shaped high-concentration NO2 adsorbing and trapping material. On the basis of the honeycomb-shaped high-concentration NO2 adsorption trapping material (the molecular sieve silica-alumina ratio is 1000-5000), NO2 is efficiently trapped through a pressure swing adsorption technology, meanwhile, the adsorbent subjected to adsorption saturation is reversibly regenerated, high-concentration NO2 desorbed gas is obtained, NO2 recycling is achieved, NOx tail gas of a nuclear industry post-treatment plant is recycled, and the purpose of recycling the NOx tail gas of the nuclear industry post-treatment plant is achieved. A stable NO2 gas source is provided for a spent fuel post-treatment main process, the dual requirements of NO2 raw material preparation and tail gas denitration of a post-treatment plant are met, and purification and recycling of NO2 are achieved.

The invention discloses a preparation method of a bifunctional catalyst for pyridine base production, which comprises the following steps: dissolving a double-template agent in deionized water according to a fixed mass ratio, dropwise adding a silicon source solution and a NaOH solution into a double-template agent solution, adding a mixed solution of a zinc source and an aluminum source, stirring at room temperature to form gel, and drying at room temperature to obtain the bifunctional catalyst for pyridine base production. Transferring the prepared gel into a high-pressure reaction kettle, pressurizing, heating to a supercritical state, treating, taking out a sample, drying in a drying box, calcining the dried sample in a muffle furnace, removing the double template agent to obtain the Zn / Al-MCM-41 catalyst with double functions, and catalyzing formaldehyde, acetaldehyde and ammonia to synthesize pyridine base by using the Zn / Al-MCM-41 catalyst. Formaldehyde, acetaldehyde and ammonia are added into a reactor according to a molar ratio, a Zn / Al-MCM-41 catalyst is added at the same time for a catalytic reaction, and the catalytic activity and selectivity are improved by using a bifunctional catalyst for the catalytic reaction.

The application provides a pyridyl-containing covalent organic framework fiber composite film and a preparation method thereof. The preparation method comprises the following steps: mixing an amine monomer solution and an aldehyde monomer solution to perform a condensation reaction, obtaining a first mixed solution, and obtaining pyridyl-containing covalent organic framework nanoparticles after centrifugation; wherein the aldehyde monomer solution is obtained by mixing an aldehyde monomer and an acetic acid solution, and the amine monomer solution is obtained by mixing an amine monomer containing pyridyl groups and water; mixing the pyridyl-containing covalent organic framework nanoparticles and a nanocellulose solution to obtain a second mixed solution containing covalent organic framework nanocellulose; and performing film forming treatment on the second mixed solution to obtain the pyridyl-containing covalent organic framework fiber composite film. The covalent organic framework nanoparticles are combined with nanocellulose, the high crystallinity and pore characteristics of the covalent organic framework are retained, and the mechanical strength of the composite film is improved by using the mechanical properties of nanocellulose.

This invention belongs to the field of building materials technology, specifically relating to a silica-alumina material, its preparation method, and its application. The silica-alumina material comprises 10-65 parts by weight of red mud, 20-60 parts by weight of slag powder, 0-20 parts by weight of silicate cement clinker, 0.1-8 parts by weight of an activator, and 5-15 parts by weight of an expanding agent; wherein, based on the mass of the expanding agent, the expanding agent comprises 0-60 wt% aluminum sulfate, 0-70 wt% carbide slag, 0-70 wt% tricalcium aluminate, 0-60 wt% calcium sulfoaluminate, and 0-60 wt% gypsum, and the content of at least two components in the expanding agent is not zero. The silica-alumina material of this invention, with its specific components and contents, can achieve both high strength and low shrinkage. When used in cement mortar, it can enhance the density of the cement and prevent cracking, enabling the material to be used for a long time.

The present invention discloses a molybdenum-containing mesoporous alumina molecular sieve and its preparation method and application. Based on the weight of the molybdenum-containing mesoporous alumina molecular sieve, the molybdenum content is 10wt% to 35wt%, preferably 20wt% to 25wt%; the specific surface area of ​​the molybdenum-containing mesoporous alumina molecular sieve is 250 to 450m 2 / g, pore volume is 0.20~0.35cm 3 / g. The present invention successfully introduces molybdenum into the mesoporous alumina molecular sieve in one step through a one-step gel method, and by using an additive, the interaction between alumina and molybdenum particles is enhanced, the molybdenum is evenly dispersed on the alumina, the accumulation of molybdenum on the alumina is avoided, the increase of particle size is suppressed, and combined with the regulation of preparation conditions, a molybdenum-containing mesoporous alumina molecular sieve with high molybdenum dispersion and high specific surface area can be obtained at a lower temperature. The molybdenum-containing mesoporous alumina molecular sieve of the present invention is particularly suitable as a catalytic material for the hydrodesulfurization of sulfur-containing hydrocarbons.

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

The application discloses a low-shrinkage high-airtightness concrete special cementing material and a preparation method thereof. The special cementing material comprises 48-63wt% low-heat Portland cement clinker, 6-14wt% sulphoaluminate cement clinker, 3-5wt% light-burned magnesia, 7-10wt% sub-micron silica fume, 9-18wt% fly ash, 6-12wt% glass powder, 2-3wt% gypsum, 0.03wt% diethanol mono-isopropanol amine and 0.1wt% pre-dispersed carbon nanotubes. The special cementing material has reasonable particle size distribution, and the components produce interactive superposition effects, complement each other and promote each other, so that the cementing material after hydration is continuously compacted, and the airtight concrete prepared by the special cementing material can maintain excellent airtight performance and volume stability at each stage.

The application discloses a kind of multi-level pore structure aerogel based on pulsed laser and preparation method and application, belong to solar energy conversion and utilization technical field.It is inorganic material containing silicon nano as freezing base element, biomass polymer is crosslinking agent, deionized water is solvent, three are uniformly mixed and stand to form hydrogel after solidification, then freeze to form ice crystal, then remove ice crystal to form micron-nanometer level porous aerogel using freeze drying technology;Finally, the micron-nanometer level aerogel obtained is customized punched using pulsed laser technology Millimeter hole, finally obtain millimeter-micron-nanometer multi-level pore aerogel.The application first uses the high single-pulse energy of laser, and the customization optimization regulation and control of millimeter level hole of aerogel is not limited by the size and shape of template, and only through simple programming can realize the diversified design of millimeter hole, which is simple, stable in process and good in reproducibility.

The invention discloses a bearing grouting material, comprising the following components by mass: 5-20 parts of ordinary Portland cement, 30-50 parts of fast-hardening high-iron sulphoaluminate cement, 3-5 parts of expansive hydration accelerator, 2-6 parts of silica fume, 30-50 parts of quartz sand, 0.2-0.6 parts of superplasticizer, 0.2-0.5 parts of retarder, 0.01-0.03 parts of viscosity modifier, 0.04-0.2 parts of early strength agent, and 0.1-0.3 parts of defoamer. The high-flexural and high-early-strength bearing grouting material of the invention has the characteristics of high early flexural strength, high compressive strength, high fluidity, self-flowing and compacting, good anti-bleeding and segregation, micro-expansion, and good long-term durability, and is suitable for gravity grouting of spherical bearings of railway bridges and highway bearings.

The invention relates to the technical field of carbon material preparation and modification, in particular to a preparation method of conductive carbon black with high specific surface area. The preparation method provided by the invention comprises the following steps: under a protective atmosphere, heating a raw material carbon black to 350-550 DEG C for first heat treatment, then heating to 800-950 DEG C for second heat treatment, and continuously heating to 1300-1600 DEG C for third heat treatment to obtain intermediate carbon black; sequentially carrying out water vapor activation and carbon dioxide activation on the intermediate carbon black to obtain the conductive carbon black with high specific surface area, the temperature of water vapor activation is 850 to 950 DEG C; the activation temperature of the carbon dioxide is 900 to 1000 DEG C. Impurities are removed through gradient heat treatment, a carbon skeleton is rearranged, and then water vapor and CO2 physical activation are utilized to cooperatively regulate and control micropore and mesoporous structures, so that the high specific surface area and the high conductivity are taken into account.

The present application belongs to the technical field of oil and gas exploitation, and relates to a nano desorption agent for gas well and a preparation method thereof. The desorption agent uses special pretreated biochar as a core carrier, loads specific proportion of bimetallic oxide nanoparticles, and is supplemented with an environmentally friendly surfactant for surface modification. Through the synergistic effect of nano size effect, catalysis / electron transfer effect of metal oxide, physical adsorption and pore transport effect of biochar, and interfacial tension reduction effect of surfactant, the adsorption energy barrier of gas molecules such as methane on the rock surface is significantly reduced, and the efficient desorption is promoted. At the same time, all components and preparation processes are environmentally friendly and harmless to human body.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

This invention provides a ceramic proton exchange membrane for microbial fuel cells and its preparation method, comprising the following steps: mixing clay, an inorganic modifier, and an organic modifier to obtain a solid powder; the inorganic modifier is alumina and silicon dioxide, and the organic modifier is selected from one or more of wheat flour, biochar powder, straw powder, and bamboo powder; the solid powder is ball-milled, granulated, pressed into sheets, and calcined to obtain the ceramic proton exchange membrane. This invention addresses the problems of poor mass transfer performance and low power generation performance of traditional pure clay ceramic membranes. Using clay as the matrix material, and through specific inorganic and organic modifiers, the pore structure of the material is adjusted. A novel ceramic proton exchange membrane is then prepared through ball milling, granulation, pressing, and calcination. This membrane has low manufacturing cost, good proton transport efficiency, and extremely low internal resistance. When applied to microbial fuel cells, it can achieve higher output voltage and more stable power generation performance.

This invention discloses a catalytic flue gas desulfurizing agent and its preparation method, belonging to the field of flue gas desulfurization technology. Specific steps include: mixing a carrier with a glucose aqueous solution, molding the mixture, and then subjecting it to drying and calcination. The carrier is then impregnated with an active metal impregnation solution, followed by drying and calcination to finally obtain the catalytic flue gas desulfurizing agent. The carrier is prepared by forming particles in a granulation container using a specific doping composition and a curing agent, followed by calcination. Compared with existing technologies, the catalyst of this invention maintains a high specific surface area and an open mesoporous structure at high temperatures, enhancing mass transfer efficiency and mechanical strength, significantly improving the dispersibility of active components and the diffusion efficiency of reactants, achieving excellent desulfurization effects, and showing promising industrial application prospects.

This invention discloses a nano-modified composite grouting material suitable for deep, high-temperature geothermal environments and its preparation method, belonging to the field of geotechnical engineering technology. The raw materials for preparing this composite material include: cement, fly ash, cellulose nanofibers, Pluronic F-127 dispersant, calcium formate, tannic acid, borax, defoamer, and water; wherein the mass ratio of tannic acid, calcium formate, and borax is (0.15-0.25):(1.1-1.4):(0.1-0.2). This invention, through the compounding of specific admixtures, effectively overcomes the defects of traditional grouting materials, such as rapid setting at high temperatures and poor rheological properties. The resulting composite material exhibits low viscosity, long pumpability, and high early strength in high-temperature environments, significantly improving the reinforcement effect on deep, high-temperature rock masses and providing a high-performance, high-reliability grouting solution for deep underground engineering.

The present application relates to the technical field of concrete materials, and specifically discloses an underwater non-dispersible concrete and a preparation process thereof. The underwater non-dispersible concrete comprises the following raw materials: cement, mineral admixture, coarse aggregate, fine aggregate, water reducer, early strength agent, retarder, water, anti-dispersant and composite fiber, wherein the anti-dispersant mainly comprises polyacrylate, vinyl neodecanoate and pentasodium diethylenetriamine pentaacetate; the preparation process comprises the following steps: mixing cement, early strength agent, retarder and anti-dispersant with composite fiber to obtain mixture A; mixing coarse aggregate and fine aggregate and mineral admixture to obtain mixture B; mixing mixture A and mixture B, and then adding the water reducer mixed with water, mixing, and obtaining underwater non-dispersible concrete. The present application has the characteristics of improving the anti-dispersibility and compressive strength of underwater non-dispersible concrete.

The invention relates to the field of activated carbon, and in particular to a high-strength and high-efficiency asphalt-based spherical activated carbon, which is used to solve the problems of low strength, low surface chemical activity, small specific surface area and poor adsorption performance of existing asphalt-based spherical activated carbon, thereby limiting the application scope thereof. After being treated with hydrogen peroxide solution, urea and sulfur powder, the high-efficiency asphalt-based spherical activated carbon can be doped with a large amount of oxygen, nitrogen and sulfur elements into the activated carbon, thereby improving its reaction activity and the adsorption effect of the activated carbon. After being treated with nano-silicon dioxide, the specific surface area, pore volume and pore size distribution inside and on the surface of the activated carbon can be increased. Therefore, while simultaneously improving the activity and specific surface area of ​​the activated carbon, the activated carbon of the invention has high strength, high specific surface area and high adsorption performance, can be used in the fields of water treatment, air purification, desulfurization and denitration, and has higher use performance and wider application prospects.

The invention discloses a preparation method of a low-temperature lithium ion battery negative electrode material, the negative electrode material comprises a porous carbon material and a carbon nanomaterial coated on the porous carbon material, the preparation method comprises the following steps: 1, preparing a precursor solution; 2, adding a carbon material and a precipitant into the precursor solution for post-treatment; 3, activating at high temperature; 4, methane cracking reaction; 5, hydrochloric acid etching; the method for preparing the battery by adopting the negative electrode material comprises the following steps: 1, preparing a positive electrode piece from a lithium cobalt oxide material, PVDF (Polyvinylidene Fluoride) and a conductive agent; 2, manufacturing a negative pole piece from the negative pole material, SBR (Styrene Butadiene Rubber) and CMC; and 3, isolating the positive pole piece from the negative pole piece, and adding an electrolyte. The negative electrode material disclosed by the invention is prepared by adopting an ion impregnation method, methane in-situ cracking and acid etching, has a multi-aperture structure, improves the discharge platform voltage and discharge capacity of the negative electrode material in a low-temperature environment, and is suitable for a low-temperature lithium ion battery; the battery manufacturing method is simple and high in production efficiency.