59results about How to "BET specific surface area is high" patented technology

The invention discloses a preparation method of a hydrophobic natural macromolecule/attapulgite composite aerogel. The preparation method includes the steps: firstly, dissolving natural macromolecules into water to obtain transparent solution; secondly, adding attapulgite and organic silicon modifying agents into the solution, uniformly stirring mixture, and freezing the mixture; finally, performing vacuum freeze drying for the mixture to obtain corresponding hydrophobic natural macromolecule/attapulgite composite aerogel. The hole diameter of the composite aerogel is 2-700nm, the BET specific surface area of the composite aerogel highly reaches 30-800m<2>*g<-1>, the apparent density of the composite aerogel is 0.02-0.35g*cm<-3>, the heat conductivity of the composite aerogel is 0.01-0.05W*m<-1>*k<-1>, the compression modulus of the composite aerogel is 0.05-10MPa, the contact angle of the composite aerogel is 90 DEG C to 179.9 DEG C, and combustion heat value of the composite aerogel is 0.6-1.9MJ-kg<-1>. The natural macromolecule/attapulgite composite aerogel prepared by the method is good in blocking performance and hydrophobicity, low in density and heat conductivity and high in strength, the combustion heat value is lower than 1.9MJ-kg<-1>, A-grade flame-retardant requirements are met, the preparation method is simple in process, short in period and free from pollution, and the prepared hydrophobic natural macromolecule/attapulgite composite aerogel is applied to the field such as building energy conservation, petrochemical industry and sewage treatment.

A process for preparing the organic aerogel and its carbon aerogel includes such steps as reaction between resorcin, formaldehyde, organic surfactant and catalyst in water, thermal solidifying to obtain organic gel, natural cooling or baking to obtain organic aerogel, and charring in inertial gas to obtain carbon aerogel.

The invention discloses a method for microwave-assisted rapid synthesis of ordered mesoporous carbon, which belongs to a preparation process of a nanometer carbon material. The method comprises the following steps: a surfactant F127, a phenolic resin and ethyl orthosilicate are mixed evenly; a uniform transparent solution is formed in acid medium by heating and stirring, and is transferred into an evaporating dish to form a thin film; the microwave is utilized to heat and polymerize, the power is between 200 and 600W, and the time is between 30 and 60min; and the high-temperature carbonization is performed under the protection of nitrogen or argon. The utilization of the method can improve the preparation efficiency of the ordered mesoporous carbon and obtain excellent structural performance at the same time.

The invention relates to a preparation method and application of a stepped hole Beta molecular sieve, and belongs to the field of preparation of molecular sieves. The method is characterized in that the macroporous-microporous composite stepped hole Beta molecular sieve is synthesized by taking sub-molten salt activated kaolin or rectorite as all of an aluminum source and part of a silicon source, uniformly mixing the activated minerals, an alkali source, an supplemented silicon source, crystal seeds and deionized water according to a certain ratio under the condition of adding no organic template agent and performing one-step hydrothermal crystallization. According to the method provided by the invention, the sub-molten salt activated natural minerals are used as all of the aluminum source and part of the silicon source, and no organic template agent is used in the synthesis process, thereby greatly lowering the synthesis cost of the Beta molecular sieve, and obviously improving the greenness in the production process of the molecular sieve material; and the synthesized Beta molecular sieve is a macroporous-microporous composite stepped hole material, and has high relative crystallinity and high BET specific surface area, thereby having favorable industrial application prospects.

The invention relates to a Ru and / or Ir noble metal oxide with a molecular formula expressed as Ru*Ir1-xO2, wherein x satisfies the relation of: 0<=x<=1. The noble metal oxide is prepared by using an amino modified silicon oxide molecular sieve SBA-15 as a template, and impregnating and reducing the Ru and / or Ir noble metal into surrounding holes of the template housing by Coulomb and capillary effect. The method is a simple preparation method of noble metal oxide with controllable morphology, and applies a hard template method to preparation of binary noble metal oxide to expand its scope of application. The Ru*Ir1-xO2 prepared by the invention shows good oxygen evolution electro-catalysis performance when used as a solid polymer electrolyte (SPE) water electrolyzer anode catalyst. The invention has extensive application value in regenerative fuel cell (RFC), photoelectric catalysis and electrolysis hydrogen generator device.

The invention discloses an ethanol gas sensor based on an In2O3 microflower/SnO2 nanoparticle composite material and a preparation method of the sensor, belonging to the technical field of gas sensors. The ethanol gas sensor consists of a nickel-cadmium alloy heating coil, an alumina ceramic tube, a platinum wire, a gold electrode and an In2O3 microflower/SnO2 nanoparticle composite material. By utilizing the catalytic activity of SnO2 on In2O3, the oxidative activity of the material is improved, so that the sensitivity of the sensor is greatly improved, materials with morphology are directly mixed at the first time, the large specific surface area of the material is utilized, and the catalytic characteristics between oxides are utilized. According to the material, ethanol gas molecules are transported on the surface and have the characteristics of rapid adsorption and desorption, so that the response and recovery speed of the sensor is increased. Compared with an ethanol sensor manufactured by In2O3 microflowers which are not compounded with SnO2 nanoparticles, the ethanol sensor disclosed by the invention has the advantages that the sensitivity is greatly improved, and the sensitivity of the ethanol sensor disclosed by the invention is about 9.5 times that of the sensitivity of the ethanol sensor manufactured by In2O3 microflowers.

The invention relates to a surface modified metal-organic framework compound, and a preparation method and an application thereof. The surface modified metal-organic framework compound is a metal-organic framework compound with a superhydrophobic surface, obtained by chemically modifying and connecting the outer surface of crystals of a metal-organic framework material with a functional hydrophobic group by a surface modification process. The hydrophilic metal-organic framework material is successfully modified into the superhydrophobic metal-organic framework material, and the modified metal-organic framework material has the advantages of fast oil absorption, large adsorption amount, high cycle number and the like; and more importantly, the preparation method has the advantages of fastness, easiness in operation, and cheap raw materials. The surface modified metal-organic framework compound has excellent application prospects in the fields of future sewage treatment and oil-water separation.

The invention relates to a method for preparing a covalent organic framework material by high-pressure homogenization. According to the synthesis method, at normal temperature and normal pressure, a common organic ligand is used as a raw material, water or an organic reagent is used as a solvent and a template agent, organic acid and inorganic acid are used as catalysts, and the corresponding COFs are obtained by homogenizing for a certain time through a high-pressure homogenizer. The method comprises the following steps of: adding 2, 4, 6-trihydroxy-1, 3, 5-benzenetricarboxaldehyde and p-phenylenediamine into a beaker, adding a proper amount of water and acetic acid, uniformly mixing, adding the mixture into a high-pressure homogenizer, and homogenizing for a certain time; and carrying out suction filtration on the product powder after the homogenizing reaction, recycling the filtrate, washing the product powder, and carrying out vacuum drying to obtain the covalent organic framework material HPH-Tp-Pa-1. Compared with other COFs preparation methods, the method provided by the invention has the advantages of continuous reaction, simple operation, low cost, high yield, environmental protection, energy saving, short reaction time and the like, has the potential of large-scale production, and can greatly promote the industrial production process of the COFs material.

The invention discloses double-crosslinking-network silicon-based aerogel. The aerogel has -C-C and Si-O-Si dual crosslinking bonds; and the pore diameter distribution is 2 to 1000nm, the BET specificsurface area reaches 100 to 800m<2>.g<-1>, the density is 0.05 to 0.55g.cm<-3>, the heat conductivity is 0.015 to 0.06W.m<-1>.K<-1>, the compression modulus is 0.8 to 15MPa, the bending modulus is 0.1 to 1MPa and the contact angle is 120 to 170 degrees. A preparation method of the double-crosslinking-network silicon-based aerogel comprises the following steps: firstly, dissolving an organic monomer containing two or more than two -C=C- and silane containing the -C=C- into a solvent; carrying out polymerization reaction to obtain -C=C- cross-linked gel; then immersing the gel into an alkalinewater solution to further obtain Si-O-Si bonded cross-linked gel; and drying the gel containing the -C-C and Si-O-Si dual crosslinking bonds to obtain the corresponding double-crosslinking-network silicon-based aerogel. The double-crosslinking-network silicon-based aerogel prepared by the invention has the advantages of good blocking performance, high strength, low heat conductivity and good hydrophobic performance and can be applied to fields including building energy saving, petrochemical industry, sewage treatment and the like.

The invention relates to a water-stabilized zinc-copper metal organic frame material and a preparation method and application thereof. The water-stabilized zinc-copper metal organic frame material has the chemical formula of ZnxCu1-xBIm, wherein x is smaller than 1. ZnxCu1-xBIm is shown as the structural formula (please see the formula in the specification), wherein zinc or copper occupies metal sites of ZnxCu1-xBIm. The preparation method includes the steps of firstly, mixing organic ligand BIm, Zn(NO3)2.6H2O and Cu(NO3)2 to be dissolved into DMF or the mixed solvent of DMF and ethyl alcohol with the volume ratio between 4 to 1 and 3 to 1, wherein the ratio of the molar weight ratio of BIm to the total molar weight of Zn(NO3)2.6H2O and Cu(NO3)2 is 1 to 1, the molar ratio of Zn(NO3)2.6H2O to Cu(NO3)2 is between 99 to 1 and 85 to 15; secondly, making the materials react for 24-72 h at a temperature of 100-140 DEG C or adding auxiliaries to react to generate solid products, cooling to the room temperature, and conducting filtering, DMF washing and drying. The water-stabilized zinc-copper metal organic frame material can be used as carbon dioxide adsorbent, has high water stability, acid stability and thermal stability, has a high porous property, has a high BET specific surface area and high CO2 adsorption capacity, and has potential application on the aspects of the greenhouse effect and the like.

The invention which belongs to the nanomaterial preparation field concretely relates to a nesting doll-shaped manganese oxide nanocrystalline grain composite particle and a preparation method thereof. The nesting doll-shaped manganese oxide nanocrystalline grain composite particle is characterized in that: the shape of the particle is spherical, the particle size is 0.7-7mum, and the BET specificsurface area is 20-310m<2>/g; and the structure of the particle has a shell-core nesting doll shape, the shell and the core are respectively composed of manganese oxide nanocrystalline grains, and surfaces of the shell and the core are full of mesopores. The nesting doll-shaped manganese oxide nanocrystalline grain composite particle has the advantages of spherical shape, controllable dimension, good fluidity, shell-core nesting doll-shaped structure, realization of a case that surfaces of the shell and the core are full of mesopores, large specific surface area, and no need of a surfactant, convenience and easy implementation, and low cost of the preparation process.

The invention discloses a preparation method of a charcoal ammonia adsorbent. The method mainly comprises the steps of shaddock peel raw material treatment, dipping activation, carbonization reaction,washing separation, drying and sieving, dipping modification and the like. The shaddock peel charcoal ammonia adsorption material prepared by the method has a developed pore structure, and a large number of pores are communicated with one another; the material is high in mechanical strength, high in thermal stability and good in ammonia adsorption effect; compared with common commercial activatedcarbon, the porous structure is richer, and the BET specific surface area is increased by 5-10 times. And the method provided by the invention makes resource utilization of solid wastes into charcoal, and has the advantages of high yield, easy realization of continuous large-batch production, and low cost.

The invention provides a carbon aerogel. The carbon aerogel is of a three-dimensional network structure stacked by carbon particles; the surface of the carbon particle is of a micropore structure; thecarbon aerogel is a super-pure carbon aerogel without metal element impurities. The carbon aerogel has the advantages that a uniform mesopore structure is formed, the stereo feel of the three-dimensional network is strong, the space network structure is stacked by the carbon microspheres, the microspheres are tightly distributed and connected, and the whole structure is complete; the carbon aerogel has the mesopore structure stacked by the carbon microspheres, and the carbon microsphere self has a large amount of micropore structures, so as to enhance the specific surface area of the carbon aerogel, and the BET specific surface area can reach about 1300m<2>/g; the normal-pressure drying method is adopted, the solvent exchange is avoided, the inorganic metal alkaline catalyst is not used,and the super-pure carbon aerogel with good biocompatibility is obtained; the carbon aerogel can be widely applied to the fields of food-level medicine loading, catalyst loading, material adsorbents,energy storage materials and the like.

The invention discloses a method for preparing silicon dioxide aerogel by a sublimation method. The method comprises the following steps of (1) dissolving a sublimation substance in an alcohol-water solvent to obtain a transparent solution; (2) adding a silicon source and a alkali catalyst into the solution in step (1), uniformly mixing and standing to form gel, and then aging the gel; (3) carrying out vacuum sublimation on the aged gel in step (2) to remove the sublimation substance so as to obtain the silicon dioxide aerogel. According to the method, the sublimation substance can plug the gaps of the gel, plays a role in enhancing the network structure of the gel, and can reduce the shrinkage of the gel; solvent exchange and gel surface modification process are not needed in the preparation process, so that a large amount of organic solvents are saved, and the preparation efficiency of the silicon dioxide aerogel is greatly improved. The silicon dioxide aerogel prepared by the methodis of a nano-pore structure and has the advantages that the pore diameter distribution is 1-200 nanometers; the BET specific surface area is as high as 300-1000 m2/g<1>, the density is 0.05-0.65 g/cm<3>, and the thermal conductivity is 0.01-0.08 W/m<1>/k<1>.

The invention belongs to the technical field of porous materials and particularly relates to a porous organic material, a preparation method thereof and application thereof. The invention provides thepreparation method of the porous organic material, the method comprises the following steps of carrying out coupled polymerization reaction on an organic monomer to obtain a two-dimensional topological material; mixing the two-dimensional topological material, a catalyst, an external cross-linking agent and a solvent, and carrying out a Friedel-Crafts reaction to obtain a porous organic material,wherein the organic monomer comprises one or more of an aromatic halide, a boric acid substituted aromatic compound, a boronic acid pinacol ester substituted aromatic compound, an alkynyl substitutedaromatic compound and an alkenyl substituted aromatic compound. According to the preparation method, the two-dimensional topological material with framework rigidity is prepared firstly, and then substituent groups are inserted into the middle of a rigid organic network of the two-dimensional topological material and are fixed through covalent bonds, so that the expansion of a porous framework inan original two-dimensional topological material is realized, and the specific surface area and porosity of the two-dimensional topological material are remarkably increased.

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a preparation method of silicon dioxide with a high oil absorption value and a high ASA specific surface area for a storage battery PE separator. The silicon dioxide is prepared by adopting a two-step method, the yield of the silicon dioxide is effectively improved by changing various conditions such as process conditions, concentration of reaction substances, reaction time, temperature and pressure intensity in the reaction process, and the obtained silicon dioxide has high oil absorption, high specific surface area, high dispersity and considerable hydrophilicity, and is good in practicability and suitable for being applied to the storage battery PE separator.

The invention discloses a montmorillonite composite material and application thereof in adsorbing heavy metals. The montmorillonite composite material comprises montmorillonite and ferrihydrite, wherein the ferrihydrite is dispersed on the outer surface of the montmorillonite. The montmorillonite composite material disclosed by the invention has a relatively large BET specific surface area and a multi-stage pore structure characteristic, not only retains the pore structure characteristic of montmorillonite, but also has the pore structure characteristic of ferrihydrite; the ferrihydrite particles with positive charges and the montmorillonite particles with negative charges on the surface are firmly combined to form a stable montmorillonite composite material; and the composite material has typical structural characteristics of silicate minerals and ferrihydrite with a layered structure, and ferrihydrite nanoparticles are of a spherical particle structure and are wrapped by montmorillonite sheets. The montmorillonite composite material disclosed by the invention is applied to a water body or site soil environment containing various heavy metals, and the heavy metals in the environment can be effectively removed.